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This may sound funny, but for a while, Yamaha put a steel bolt in the aluminum casing on the side of the motor. dissimilar metals caused extreme corrosion inside that affected operation. Check out Boating forums on Yamaha.
I have a ttr 90 that idles well but bogs down at full throttle. Carb is clean and has new pilot and main jets. Seems to run slightly better with intake off. Which leads me to believe the mixture is rich. No adjustment on carb. Stumped?
If all the engine oil passages are unostructed and clean, you will have to try a lower volume oil pump. Some high performance engines are painted internally with special paint to reduce friction and smooth the down the oil flow down back to the pan.
The main jet need cleaning.(you should clean them all though)
Main Jet: Main jet comes into play at three-quarters open to full throttle conditions. CRITICAL to high-speed engine operation. Not only does it meter the gas into the engine, it can aid in cooling the engine as well.
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