Originally Posted by zJatoRad

yes, a brand new 08 3 Port R-Spec, we started noticing the bogging since in the tank 4 or 5 of break in, we thought it was some clutch or tune issues but nope, it turned out to be the needle, the o-wring didn't look bad, I don't know what's wrong with that needle.

Originally Posted by soccerlaw

Had the exact same issues today with my 3 port R as the guy described below. Two very experienced tuners got it running amazingly. Let it sit for about an hour (no change in outside temp during this time) and it suddenly has about 65% top end speed and very erratic behavior. What could it be that is making it lose its tune like this? Air leaks, the carb? I'm still very new at this, but the people at my track are not and its even got them stumped.

Originally Posted by Tree

I recently been having the same issue with my 5 port. It was running fine the day before still a little rich since I only had about 3/4 of a gallon through it. The next day I couldn't get it to hold a tune. Once I got it to idle decent, the engine would lean bog. I richend up the HSN until it was sticking out pass flush. I finally returned the needles to factory break-in settings and started over trying to tune. What needles are people using to help correct this issue? I don't want to spend $70.00 to $80.00 on an OS carb. The whole reason I bought this engine was for its cost and performance. Any help with what seems to be a lean bog issue will be appreciated. Thanks