Originally Posted by
vti-chris
I never had a single problem with my other engines.
I want to believe that i can tune an engine without any problems...but this one is a nightmare.
I finished 35min races with it having bogging problems and finishing at 240-250F.If i richen the LSN any more it looses power down low due to rich settings.
The high speed needle is pretty easy to tune so i don't thing i have it wrong there.
Although i haven't checked my rod and bearings to be honest.
I'm not saying you don't know what you are doing or that you can't tune. It's just that these engines require a bit different approach and you are better off by going the longer route as it pays off eventually.
If you rung good on start and then loose power after half a tank you are
lean on HSN not on LSN. If you say fattening LSN makes it worse so this backs up the above assumption. I had this same issue before I figured it out with a help from MM. Strange thing was that you were like 5min off on HSN and started to have the issue. I ended up fattening HSN about 7-10min and leaned LSN about 20min and had also much lower temps after that.
Have you checked the plug color ? It's a good indication where you are going.