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Engine Trouble
Alright, I've got a '02 Yamaha 150 2 stroke HPDI, and I'm having problems at high RPM's. Everytime I try put her WOT she starts to drop down between 2k and 3k, but will jump around violently. I've read other forums and they have talked about the O2 sensor, but I've also heard that the O2 sensor doesn't affect HPDI models at high rpm's. It could be a fuel pump problem, but I'm not sure how to check pressure at that rpm range without a load on the engine. Don't want to mess her up anymore than she already is. If anyone has any ideas or has dealt with similar problems and can give some advice I would greatly appreciate it.
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