I have an RCMK CR300F - with a 990 carb that has been modified with 2 bearings on the throttle shaft at either end.
The carb is relatively new - was performing fine, I have checked all the gaskets and replaced a couple, checked the hose pipes, but despite all that it seems that the HSN needle setting make no difference in the tune at high speed, no matter how far I unscrew the needle, I can't get the engine to behave 'rich'?
The stock settings almost feel lean at 1+3/4 +- 1/4. It warbles a bit on WOT, I can never get it to 'gargle'?
Before another tear down, has anyone had this problem? And know exactly where to point me to - and assuming its the carb, which bit? Or are bearing modified carbs a liability??
Cheers,
Richard.
The carb is relatively new - was performing fine, I have checked all the gaskets and replaced a couple, checked the hose pipes, but despite all that it seems that the HSN needle setting make no difference in the tune at high speed, no matter how far I unscrew the needle, I can't get the engine to behave 'rich'?
The stock settings almost feel lean at 1+3/4 +- 1/4. It warbles a bit on WOT, I can never get it to 'gargle'?
Before another tear down, has anyone had this problem? And know exactly where to point me to - and assuming its the carb, which bit? Or are bearing modified carbs a liability??
Cheers,
Richard.