From there you will find parts guides, brochures, manuals, specifications, canvas installation manuals, vinyl care information, square gauge setup, weather links, computer desktop backgrounds, etc. The calculator below uses the above formula. Strange thing was, it ran fine the year before and got it out for new season and nothing but trouble. Livebait trolling is deadly for a wide variety of pelagics, but in order for it to work, you have to get your boat speed down to a crawl. The correct propeller will allow your boat’s engine to reach its maximum recommended rpm (revolutions per minute) at full throttle, trimmed up … Prodrive won't get up to speed Hey guy, I'm very reluctant to ask for help on here, but I'm having issues with my boat and I really need to figure it out. You can't load the boat on the trailer like out on the lake so it probably won't get up … Not bad considering 3% loss of HP for every 1000 feet in elevation. plugs, wires, cap, rotor etc? Since the boat is brand new with only 20 hours on it I would hate to think it needs to have a full tune up with new wires, cap and rotor. Man 50!! I'm religious about checking the dipstick and noticed it was overfilled when we took her out one day and put it in the back of my mind. 6. I found this out with my boat, it would start and run OK, but no WOT. Use the Search feature in the top right corner of the forum. So a 22′ boat with no load may get up to 29mph, but will likely slow down to 24.5mph with 1,000 pounds of people in the boat (5 or 6 … Clear editor. Air leaks in the fuel line are typically created through either natural wear or damage to the line. Funny thing about a boat is many times you find the problem by ruling out what it isn't. They may want you to buy them all and allow you to return the 2 or 3 … If your boat slip has sufficient width, your new HydroHoist boat lift can be set-up to accommodate both a boat and 1-2 PWC’s. When they don't, there can be a substantial loss of speed and an increase in fuel bills. You maybe dealing with bad gas since it sat through the winter. × June 23, 2020. I didn't really have any problems during last year's boating season. Or, it's frozen … Are there any rpm limiting features anyone is aware of? The boat is under warranty and either the boat has the wrong gearing or there is something else wrong. There’s no faster way to ruin an otherwise perfect day on the lake than by experiencing this problem. 3. I have experienced this event on mine last year after it was serviced. Rest the yard stick or another suitable straight edge along the keel on the bottom of the boat so that it makes a straight line aft to the outboard. This way you don't have to type it into to every post you put up. Display as a link instead, × Don't be a stranger. I replace the fuel filter, oil filter and all fluids before taking it out. I only get one year so I better use it while I have it. Posted by admin on Dec 31, 2012 in Boat Accessories, Boating | 3 comments. Paste as plain text instead, × Greetings fellow boaters. And yes, I love Chaparral. I don't think you're in the ECM's limp mode, that RPM range is a bit lower than 4,300. This occurs when the bond between the propshaft and blades are broken, which subsequently causes the rubber insert to spin independently. I realize that the type of prop used, weight, altitude, etc can all affect max rpm however, I did not have any problems getting close to max last year with the following set up. ADVERTISEMENT Sterndrives and outboards don’t really have much of a rudder, relying more on directional prop thrust. (not an option any more for those with catalytic converters on their boat engine...). I know that Yamaha has a 2" difference in some of their outboard aluminum props vs. Mercury. Thanks everyone for the feedback. Fixing Steering in Your Boat. This is where a Dealer, Chaparral and Volvo will have a chance to prove what kind of companies they are. Get on plane, go to wide open throttle and trim out the motor until you reach top speed. The service technician quite honestly has indicated that the motor is fine and that the problem is 100% gearing. It allows for a larger volume of air to be displaced from the tanks at a higher rate of speed. . This can be a nightmare to disassemble and repair. Thats pretty stinking good at that altitude. An EFI engine can hide being down a cylinder at low RPM by bumping up the timing and fuel to the other cylinders to compensate. shut motor off and it won't start after 45 minutes being towed back to dock still won't start. The boat is 1000 rpm short of WOT RPM and with a gain of about 300 rpm for each incremental drop in pitch that would mean I would need to run a 13 pitch prop to get to WOT. They did not take it to the lake to test the RPMs under load though. This occurs when the bond between the propshaft and blades are broken, which subsequently causes the rubber insert to spin independently. Prop pitch and drive gear ratio is responsibility of the dealer who ordered the boat from Chaparral. Ask a Boat Repair Expert. Remember, I am at altitude and I asked several times before buying the boat if it had altitude gearing and the answer was yes. Second, run the boat up to full speed. Regardless, the boat should not have any problems getting to WOT RPM with a 19 pitch prop even if the gearing is correct. Check out a Merc 4 blade Aluminum too. Maybe something to investigate. By i.e. Also possible the tach has gone wonky and is reading the RPM at a lower rate, but a person most times knows if their boat is making full steam or not. I can get it to 2.8 to 3.5 mph trolling speed and it runs a little rough while trolling and if i go any slower it will stall and while trolling i have to hit the choke every 15min or it will stall or as it feels like its gonna stall i throttle up a hair. Again, welcome to the asylum/forum and we look forward to more from you. ... full,3/4,1/2,throttle and idle. Note, when I bought the boat I had the same problem during my orientation with the dealer. Depending on the severity of the problem, it could leave your boat dead in the water unless the problem is fixed ASAP. Stay tuned as I will update once again with the end of the RPM saga. Your engines should come to within 100 rpm of their rated rpm. I am pretty sure the volvo service tech did not take the boat to the lake to do a test under load to look for a down cylinder but I can certainly suggest it. We like pictures a lot! We have a lot of experts here with a large amount of life experience. Connect one-on-one with {0} ... but wont get up to speed...just chuggs along at full throttle. I think the gears are incorrect. I suppose it could be bad gas but I always store the boat in the winter with Sta-bil added to the tank. If you have an account, sign in now to post with your account. I have a 3-blade 19 pitch stainless steel prop as well as the 19 pitch aluminum prop the boat came with. An abrupt shut off sounds more like cutting the electrical system rather than running out of fuel. Another possible cause is an air leak in the fuel line. In case you were wondering, I did 50mph with the crappy alumunim prop at 5700 feet in elevation. 2. Choose the pitch accordingly. With my 70hp my boat will top out at 30mph and now i put the throttle down and it goes 9mph wide open. When I hammered the throttle she wouldn't make the same smoke I was accustomed to. It doesn't take very much water to plug these off. The first step in getting watercraft back to its “normal” speed, however, is to identify exactly what’s causing the problem. Upload or insert images from URL. Weights for all of the watercraft to be stored must be taken into account. There is good information in there that you will want to know including that we cannot discuss pricing. re: Yamaha 50 runs but no power, won't plane Posted by Boats n Hose on 8/25/12 at 10:04 am to LSUwag We do now, and run the gas out of the motor when it'll sit up for a while. It’s not uncommon for fishing line, rope, seaweed or other debris to entangle itself around the blade, restricting it’s normal movement. . Cutting away any entangled debris such as this should solve your problem. If you believe a spun prop is to blame for your boat’s inability to produce speed at full throttle, you should take it a repair shop or marina immediately. By using known values for the weight, power and speed you can come up with a more accurate constant for your boat. !The only time I hit fifty is when it is on the trailer! Have you given it a good spring tune up? I am sure we will get this issue fixed. Glad you figured it out - most people are unaware of how much diameter or even cupped vs non-cupped can make in performance. If you got close to WOT last season with the same prop, at the same elevation, weight, wind, temperature, and your boat bottom is clean, then off the top of my head I'd venture your fuel has gone stale, distributor cap needs to be cleaned or replaced, or your engine is down a cylinder. I didn't realize that the Mercury props are a larger diameter than Volvo props. There is the possibility that it could be slightly overfilled and thus causing your drop in rpms. parts, accessories, boating supplies, tools, & aquatic sporting That extra 51 HP I would gain at sea level could probably push me up over 60 MPH with the right prop. Trolling bags slow boat speed and stow easily when not in use. Welcome to the forum milehighchap . You mean you can't hit 50 in your boat when it's going down hill? Your boat may operate just fine, and then all of a sudden its speed drops to a crawl. After you have identified the reason, now it’s time to fix your boat. It’s going to have some major disturbed water issues at its current location, way up and out….. I recently took it out for the first time this year and although it starts and runs just fine I cannot get it up to or close to the spec of 5200 max rpm at WOT. The boat’s motor will still operate and function as it should, but the lack of a connection between the propshaft and propeller blades drastically reduces the boat’s top speed. Have you checked your propeller for debris?   Your link has been automatically embedded. Even if your boat is operational, riding with a spun blade places the propeller at risk for damage. The recommendations above are great places to start. I told the dealer I bought the boat from that is had lower gearing and even he was suprised since they order all their boats with high altitude gears. Have Boat Questions? My lift won’t go down. There is a lot of good information on this forum that will answer many of your questions. The correct power up process is by turning on the transmitter (controller) first and then the boat. Come back early and often to post. Any owner seeking the last bit of speed from an outboard-powered boat should grab a yard stick. This also makes it difficult to accelerate when it is already at a high RPM level. If your jet ski won’t start or accelerate the problem may be fuel quality, especially if it’s … Check where the crankcase halves bolt together look for bubbling fuel or air escaping between the halves. We are a community of friendly and some of us are border-line psychotic. We are glad you are here and believe that you will find answers to a lot of your questions. Just remember that going from an aluminum to a stainless will make a difference, but moving to a 4 blade from a 3 blade will be even more of a change. I know that will be of little help with your question but thought i'd mention it. Wrong Fuel. You can then see what effect changes to weight or power will have on top speed. I will be shopping for a Volvo 4 blade stainless prop soon to optimize performance but at least I don't have to worry about any engine problems. If there is any leaking around the crankcase halves the engine has to be disassembled and resealed. If the boat has sat and the grease is allowed to harden or corrosion allowed to build up, the cable end will not move freely through the tube. Perhaps a temp sensor is sensing an overheat condition and cutting the power to the fuel supply. Enjoy the boat and it's regained performance. One possible reason why boats no longer achieve appropriate speeds at full throttle is a spun prop. Not to measure boat speed, but to gauge the mounting height of the outboard motor on the boat transom. This depends dramatically on the specific boat and the setup, but just as a guestimation aid, for every thousand pounds you add to your boat, you’ll lose about 15% of your speed. But we admit to it and that's the first step to recovery. milehighchap, By clicking on your name in the upper right corner to bring up your options select my profile to add into your signature your location (geographic area). Back to the slip where I pulled out almost an extra quart of oil. NOTE: if you are down a cylinder, this often has to found out with the boat under load using a drop cylinder test from a diagnostics computer. Spray some wd40 around the intake gaskets if rpms increase you a leaking intake. This is of coarse after it finally got to 5200 RPM. The dealer service department suggested fuel injector cleaner however this seem unlikely since it is a new boat with only 19 hours on it. I top out at about 4300 rpm. The good news is the boat is still under warranty so I may just end up taking it in but if it is something simple I would prefer not the hassle with warranty work. I recently took it out for the first time this year and although it starts and runs just fine I cannot get it up to or close to the spec of 5200 max rpm at WOT. A few pointers for you to do (if you have not already done so) to help us help you: 1. THINGS TO KNOW ABOUT YOUR RC BOAT Frequently Asked Questions and Troubleshooting A. I have a high speed racing boat and I am not getting any throttle response. Boat Not in Neutral. Was the dealer you purchased through at the same or similar elevation? Note the motor's RPM and bring the boat to a halt. So, happily to report the new Chaparral is working just fine. Does anyone have any suggestions? F90TLR 4 Stroke idles fine but won't get up to speed 06-15-2013, 02:50 PM This is a 2005 F90TLR that is idling fine, will run at low speeds (8 to 10 mph), … I decided to simply take the boat in for warranty. . Collin Park Marina, Lake Lavon Wylie, Tx, Retired Admiral of the United Texas Fleet, Now a Flagged Rear Admiral of the LKN Sunesta Fleet. I expect the service dealer will have a couple of lower pitch props to try which will prove or disprove that theory. Just some a fun stat though. However, later he came back to me with a tech bulletin from Volvo indicating that the 160 gears were the high altitude gears. I can't imagine what it would do at sea level with a higher pitch pitch stainless steel prop. The best source for Mercruiser OEM parts, marine engines, boat & engine Plug in your info, and click "Calculate" on the item you want to compute. Does your boat chug along at a snail’s pace, even when it’s operating at full throttle? Now all I have to do is get some good weather and its time to hit the lake. They indicated the boat had no error codes and was not having any problems. (loose spark plug wire, etc.). Now let’s discuss those above-mentioned problems in detail. Something is still not right. After that, she went right back to redline. Inboard boats typically don’t suffer from low-speed wander because their rudders have enough surface area to overcome the tendency to veer off course. Read through this thread to learn more about how to do so. (Or you may have excessive loading or hydrodynamic drag.) The local Cobalt dealer here in Denver who is the one who investigated the problem indicates that they order all of their volvo penta boats with 1.9:1 or higher gear ratios. Are you located in a higher elevation (the name may be an indicator lol)? One possible reason why boats no longer achieve appropriate speeds at full throttle is a spun prop. Third, perform a compression test, something any good mechanic can take care of, but which you can also do. I put the Volvo 19 pitch, 3 blade, aluminum prop back on the boat and the RPMs went up to about 4900-5000 which is close enough. The Mercury 19 pitch, 3 blade, cupped stainless steel prop is simply too much prop. A couple suggestions:See if your prop shop will allow you to demo a couple props. But read some of our other posts on here to learn the work around for that. Most boats must be in neutral before starting the engine. They indicated that the boat has 160 gears which are sea level gears. Well, I took the boat into a local volvo penta service center (not the dealer I bought the boat from since it is several hours away). Boat. Try replacing you fuel filter{s}. I would put in some fresh gas, Sta-bil Marine and see what happens. Also under your signature add the type of boat you have and its mechanical systems, such as boat type, engine, drives, etc. I will be shopping for a Volvo 4 blade stainless prop soon to optimize performance but at least I don't have to worry about any engine problems. Fuel Glad it all worked out for you. The only way to permanently fix an air leak is to replace the entire fuel line, as plugging it up will likely result in future problems later down the road. Without it, you may not get any answers. I still think there is something wrong (like a throttle possition sensor or fuel system delivery issues) since the boat did have a problem during orientation when I took delivery of the boat. Changing the prop down to a 17 degree might get me 300-400 rpm that still doesnt get me close to WOT redline. 5. 4.   Pasted as rich text. I am glad because this is the easiest and cheapest thing to fix. a 19" Yamaha is equivalent to a 17" Mercury on say a 115 hp 4-stroke. This is my 2nd one and certainly not my last. When you turn the wheel, the engine/outdrive doesn't turn. When this occurs, there’s a constant fluctuation in the amount of fuel that’s pumped to the boat’s carburetors, and as a result, the motor’s RPMs go up and down. Maybe a silly question but, did you happen to have the oil changed recently? If the boat maxed out at 5300 RPM last year, I would say the gear and pitch are pretty close to where they need to be. Good as new. This boat right out of the dealership (not fully broke in) at 4000 feet in altitude with 1/4 tank of gas and a 19 pitch aluminum prop did 54 miles per hour at 5200 RPM.   Your previous content has been restored. The engine stalls in neutral, at idle, only. You may need special equipment like a torch or a push rod to get the cable end out of the tilt tube. Tried several different prop and finally found the rite pitch and bam. Being an informed buyer can only help my cause. No way. Lots of good stuff there for you and your Chaparral! April 2, 2010 in Boat Talk. I never would have guessed it but the root cause ended up being the propeller after all. It goes in later this week so I will post the solution once I get it back. If they don’t, they may be not be putting out all the horsepower they should. Next, repeat the WOT run in the opposite direction to account for wind or tides, and take an average from the two RPM readings. Some jet boats are known for having less torque which can make it difficult to maintain speed in a turn. However, after several passes the boat finally did reach 5200 rpm so the service techs chalked it up to perhaps old/bad gas. We had the same problem years ago and it ended up being the prop. If your boat is in gear, … Get up to speed on boating safety as summer season approaches Officials with multiple agencies suggest visitors and residents alike should take the time to brush up on boat safety to ensure a … I purchased a brand new Chaparral 204 SSi with the volvo penta 5.7L GI SX (single prop) last July. So one place says it doesn't have the right gears and the other says it does. Not with a 5.7L 300hp motor in a 20 foot boat. 6. Boat won’t go over 3000 rpm under load- Problems and Solutions. Copyright © 2021 Performance Product Technologies. Plug in the Li-Po battery and then you will hear a beeping sound. Take some time to look through the Help (upper right corner) and > Info Center) located under Chaparral Boats Forum on the main page. Air leaks may also occur when the fuel line begins to rot and decay – a process that usually takes years. We also provide some humor, of course at no charge to you other than the initiation fee you paid to join this forum. If so, Shepherd is right, it may down a cylinder and you may not even notice it, a compression test and CLT test will tell you that. I top out at about 4300 rpm. When your outboard starts right up, keeps running with throttle applied in neutral, but shuts down the moment you come back to idle speed in neutral, the issue is likely to be a sticky or broken AIS (automatic idle speed) valve. goods. × Strange stuff eh?   You cannot paste images directly. The dealer I bought the boat at is supposed to contact me in the next day or two. To me is sounds pretty silly to have a 5.7L 300HP motor in a 20 foot boat and have to run a 15 degree pitch prop or lower in order to hit WOT redline at 5000 feet. I fully expect to lose a couple hundred or so RPM due to going up about 1200 feet in altitude but not 1000 RPM. This will help us help you a lot! Just a thought. Take a minute to review our Terms of Service, again right corner. I read something about a possible rpm limiter if the oil level is low. I am hoping I might get some help on this one. Regardless of your boat’s throttle setting, the presence of an air leak will greatly restrict its speed. Get that thing 1) further into the water slipstream (bottom of the boat should about intersect the midline of the tansducer, if not even a touch lower) and 2) further toward the engine. 7. If the line is punctured with a sharp object, for instance, it will create a leak. So when you get a chance, post some pics of your ride. You can post now and register later. Most of these solutions are DIY, but if you’re a newbie, it’s better to get it checked by a pro. Most similar size boats in my area are able to turn 19 pitch props without issue. I'll admit I'm new to the boat …