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Hydrocarbons will cause the same problem as an exhaust leak. Bill M.

Looks like the connecting rod failed. Is there any previous rust in either cylinder, or inside the front cover? Bill M.

Half measures is only going to get you more problems and headaches. We know what causes the problems. We know how to fix them right,. We know how to make them reliable, last for years, and be confident to let a beginner ride it because they can thrash it, screw up, and have a great time...

This must be a 1986 to 1990 JS550 It runs, you saw it running. You just don't know the secret handshake :) This is what happens with 550's. Only their owners know how to start them. If you let a friend ride it, you start the ski and your friend has a great time on it until he falls down and...

It depends what you consider a "Modern Watercraft." I consider modern watercraft as super charged 4 strokes! and I did work on early 4-stroke Yamaha, SeaDoo's, and direct injected 2 strokes. What we are talking about are 2 stroke dinosaurs that are 15 to 30+ years old, and many are officially...

1) Most water craft did not have a restrictive flame arrestors. That includes Yamaha, SeaDoo, and the majority the Kawasaki's. Only the Kaw JS300, 400, 440, 550, and early 650 have restrictive flame arrestors. 2) If you replaced the stock flame arrestor with an aftermarket, and readjusted the...

Make one, Do you have an air compressor or bicycle pump. Most people will Never Ever, come across a problem that is actually caused by a high pop-off. Reducing pop-off may cure a problem, but that does not mean the pop-off was the problem. Too many people on watercraft forums equate reducing...

Like JC-Superjet said: Do a pop-off test! But your first pop-off test should be completed with the carburetor completely assembled. There are other possibilities for fuel to be in that spot. Bill M. Pay attention during disassembly, when you are diagnosing a problem.

++1 A good example is after reading 2 stroke tuners handbook, some of his porting advice can get you in trouble. I am not much of a Yamaha guy, but it looks like you filled the casting voids completely with JB weld, why? I know why you fill them with JB weld, but why did you fill it to the...

Looking for a 42mm id (not 50mm) PJS side draft exhaust manifold. Thanks Bill M.

I am curious what pitch impellers are preferred for freestyle ? A variable pitch with a low degree leading and trailing edge compared to a regular stand up? Anybody try a straight pitch impeller?? Bill M.

First off, why did people choose low pop-off with large needle and seats? It all started with go-karts, and snowmobiles. Their carbs were similar to the Mikuni BN, and they were manufactured by Walbro, Tilitson, Mikuni, Keihin, and possibly others. A big difference with some of these carbs was...

(They only allow 1000 words per blog) Jetting Basics, Part 1 Jetting Basics, Part 2 Jetting Basics, Part 3 @maxboost I will answer on Thursday. Bill M.

2.0 w/80gr spring. A rich low speed (pilot) circuits kill top end, read my blog on pwctoday and learn how to adjust and possibly rejet the low (pilot)circuit for best performance, and reliability (starts easy, doesn't load up while idling or 5mph zone, the engine doesn't quit while idling and...

Jet Ski courses have been getting longer and longer since the 90's. Like OCD Solutions said, stand-ups and sit downs race the same course. But the courses defiantly favor the sit downs. The World Finals might be the longest track you race all year. In a typical stand-up race, once you get...

If you use a Keihin to Mikuni adapter plate, and possibly drill the main jet. What year is the 44 BN from and why do you want to replace the Keihin. Engines swap, but reed cylinders will not fit PP cases. Both carbs have their own unique problems and advantages. You will need a return line...

That is basically what the book from the 70's 2-stroke tuners handbook says. Racers have also increased the stinger diameter on FPP pipes because they were more reliable with the larger stinger. Some blamed it on "over scavenging," but I don't buy that reason either. Large stingers...

I have never worked with that pipe. Often when you dry a pipe out there are a few negative possibilities. A common problem is sagging acceleration. Hotter exhaust, shorter pipe, and HP at a slightly higher rpm tends to flatten the acceleration, (front side of the ) curve. This happens normally...

Your specs wouldn't indicate a rich low speed or pilot circuit, but do you remember what spring and seat was in the carbs? I was also wondering if you have a low idle, fast idle, or no idle? Bill M.

2 thoughts. I prefer the easy ones first. Flooded. Ignition will only occur within a narrow range. Pinch off the fuel line or remove it from the tank, and hold the throttle wide open, check the spark plugs often. Keihins are famous hard starters. Most of the time the needle and seat refuses...