So I posted this in the 170 section with no luck…

I have a 14′ with muzzy exhaust/ intake… my sons been driving it for the past two months with zero issues.

Yestersay mid driving it started to get a real bad sputter, only happening at full throttle, today I removed the carb and thoroughly cleaned it, replaced the plug ( which looked to be fouled ).

I replaced the plug and put everything back together, she is still sputtering at full throttle, I can hold it about 3/4 throttle and it’s fine.. the last 1/4 is where the issue is.

During the carb clean I was going to move the needle clip up one to lean it out but found it was already at the top adjustment. The jetting is 135/40 and the carb is a Keihin. I didn’t think these came stock with keihin carbs but it looks identical to the factory carbs I found online.

I also checked the small white fuel filter which was clear of debris.

Could it be a bad pump? Jetting change? But it was running fine with current jetting.. we are at sea level.

UPDATE- 9-16-17
I put the new fuel pump on it, did not make a difference… so I removed the carb again and installed a 140 jet… so 40/140.. put everything back together… still has a sputter.. wtf! Pulled the plug after a few floored runs around the block.. looked great. Removed the bowl again and tried a 38 jet.. so 38/140 now… took her back out.. same crap. So frustrating…

Starting to thing it’s something electrical? Maybe something got wet?

Any advice would be greatly appreciated.

Thanks

Utah RZR Rentals

whence