Originally Posted by
teamreidy
Ok i have to say that i had the same issue until this last weekend of racing. my brother and i both have the go tech 3 port sport motors and had lean bogging issues after a half of a tank. it was frustrating i changed to an os carb and my brother kept the origanal carb on his after trying to tune the motors a local guy we raced with who has the same 3 port sport motor showed us that once you set the low end to a 3 to 6 second pinch test all you have to do from there is tune the hsn. I have to say once we both did this we had all the power we needed and the low end bog was gone and kept a consistent tune throughout the entire race from then on. so from my experience set the low end and then tune with the hsn.
worked for me and my bro hope this helps any one else having the issue as well
This is what i recommended for petvette who sent me a PM , thaks by the way for taking the time Pete !
here is the response i sent to help with this problem
Hey Peter
Ok to me it sounds like you may have something in the HSN needle , maybe part of the rubber seal or dirt obstructing the fuel flow. Do you use a fuel filter ? if so try running without it and see what happens .. The situation also sounds like a rich bottom and lean top .
if the carb is clean and filter is not the problem then id try leaning the bottom end a touch and running a tad richer on top. What happens is once the engine is at temp the crank case will start to atomise fuel more readily and lean the engine off.. you should always tune from half tank once the engine is at temp. you may have already tried this but but if you havent , then give it a go .. We have the same engines here in AUS and never encountered this problem. id also check the front bearing , see if the rubber seal spins .. if it does then you need a new front bearing ..
hope this helps
Thanks for taking the time and please let me know what your results are ..
Cheers MM