OL JS Rider

I have a 86 js300 that i converted to a 440. I installed a bn44 mik and manifold on the engine. The ski starts easily but it is tempermental in all rpm ranges. the carb has a vac cap on the rev limiter port. I have been reading posts that talk about a restricter for removing the rev limiter. I have never heard of this. Any sugestions?

OL JS Rider

If any one wants to run a 44 mm mic on there jet ski that didnt orig come with a rev limiter you must put a restriction in the return line. The rev limiter is a ristrictor it has a hole to pass fuel back to the tank that is appx .040 . I installed a restriction in my return line and now the thing runs great. I was pulling my hair out before i tried this.

JSJS550

It sounds like you were having the same problem that I am having with my 85 550. It had the rev limiter removed when i got it and does not want to run smooth no matter how much I tweak the carb. It sounds like you have found the solution. What exactly did you do to fix this problem? Restriction in the return line? What did you use, how did you do it, etc? Any help will be apreciated as I am pulling my hair out as well.

Thanks, Joe

OL JS Rider

I simply took a piece of 1/4 dia brake line about 4 in long and smashed it in the middle with the benchvice till it was difficult to blow thru but not too difficult. Then installed it in the return line.