Originally Posted by
J.Sears
Hey guys I dont mean to sound like a dumb ass but I can not get my motor tuned right. I have a MR21 B01T with the magnisum head. Ok so I take it out today and run it for the first time scense break in which still isnt completly broken in all the way yet still has alittle metal pinch left in it. well what it's doing is before I put it on the track i warm it up for 2 or 3 minutes and get the idel perfect on it well so I thought the first heat race i run it for 6 minutes and notice about half way through the race it has a real high idel like so fast it wants to push me through the turns. Why is it doing this? I just cant seem to get the hang of tuning for some reason it seems like the longer i do it the worse I get. I have read every thing i can find about tunning and it doesnt seem to help me any. Can someone please help me or point me in the right direction to get help and help me when to know when to richen or lean the bottom end and top end.
I had the same problem with my GRP .28 tune-line, your MR21 B01T is the same as the GRP .21 tune-line take it to stock at 0.045 inch tops needle from flush going in the same for the bottom but from flush 0.045 out and for the idle it's 0.030 inch this is your best starting point. My .28 was doing it and it was to lean in the bottem very puchy and idled Hi Start with stock settings and you should find the sweet spot just hit the top needle still it run just under 190% and you should be good.
Hope this helps