Hey so I took my b1 out tonight and it revs and hits limter etc fine outta the water but in the water it run great for like Mabye a minute and flooring it once but then just breaks up and runs like poop it has a riva after market cdi has riva red pipe Ada head with 35cc domes brand new built motor 701 61x 10/16 prop jet manic water box 44mm carb don’t know jetting in it
Wave blaster 1 help
- Thread starter 650sx mod
- Start date
- Location
- Charlotte, NC
Check your reeds. Also worth the effort to do a leak down test and make sure you don't have an air leak somewhere. The symptoms you described could be either of those issues
- Location
- Charlotte, NC
Block off the intake and exhaust and use the pulse fitting and a head held pump like a popoff gauge and pump it up to 10 psi. Should hold for at least 10 minutes
- Location
- Charlotte, NC
- Location
- Ontario, Canada
Another way to do a quick air leak test which is not nearly as good as the leak down test, but still good for when you're on the road or need a quick answer is to apply oxygen around the crank seals, base gasket and intake gaskets. I have one of those little portable MAP and oxygen welding kits, I only use the oxygen to do air leak tests. Run the engine, apply oxygen around the mentioned areas and listen for an increase in RPMs. If it revs up where you're applying the oxygen, then you will have located an air leak. Do not use any other gas to do this type of testing because you run the risk of flooding your engine compartment with combustible gas and a possible fire or explosion. Oxygen will raise leaving the engine compartment and is not combustible in the same way as heavy fuel vapors like raw gasoline or propane where they accumulate in low areas and concentrate waiting for ignition to happen.
Also my buddie said it reminds him of how his sled ran with a bad crank seal even tho these should be new but funny thing about the crack seal is the carb this motor came off of had a red pipe on it and mild mods hence why I thought it would be a good fit and that motor when I took it apart the front crank seal was leaking oil out of it and go like it was bad but it still ran great I guess it could always be the rear seal on mine but I’m just a little lost wish I wasn’t out of town all week so I could mess with it
That's what the leak down test is for. You have to seal off the intake and exhaust and put a small amount of air pressure into the motor. If you have a leak then you start searching for the leak. Did you watch the video posted above?