YSR50 cutting out at high rpm/WOT?!

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YSR50 cutting out at high rpm/WOT?!

This is a discussion on YSR50 cutting out at high rpm/WOT?! within the NSR50, NSF100F, MB5, NS1 and RCV Mini forums, part of the General Talk category; I've got a 1987 YSR50. Stock bore, tcr exhaust, mikuni/sudco carb with k&n air filter. After cleaning the carb, it starts, idles and runs beautifully, ...

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  1. #1
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    Mitchell1789's Avatar

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    I've got a 1987 YSR50. Stock bore, tcr exhaust, mikuni/sudco carb with k&n air filter. After cleaning the carb, it starts, idles and runs beautifully, but at high rpms, it cuts out and stutters almost like a rev limiter sometimes. Does it at a standstill and when riding under a load. Can accelerate pretty well but it really seems like when I give it over 85% throttle or so it just wants to break up. If you baby it and get to higher rpms, it cuts out until you reduce the throttle then it picks up again. Tried adjusting the air fuel screw with little to no difference, and the needle being in the middle clip seems to be best, one clip up(more fuel) and it breaks up at a much lower rpm/throttle, and one higher clip(less fuel) and it seems to be worse then original position in the middle. Any ideas? Running a b9hs. Also running premis and oil injection just to be safe(bike is new to me,didn't trust the injection) Thanks in advance!!
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    Last edited by Mitchell1789; 03-10-2016 at 12:51 PM.

  2. #2
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    PocketBikeRacingTsmmr's Avatar

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    You might have to play with the jetting..

    One of my bikes does this too but it took me so long playing with Jets just to get it running right that I don't want to mess with it anymore..

    I thought it would be the CDI box but I changed it and I stuck it the same issue ..
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