Originally Posted by
Jesussaves
Grizz1, when I had the engine behaving the way it should, not lean bogging, bottom set correctly, I had no top end. I was getting humiliated down the straight. To get some top end I leaned the top end then the lean bogging starts.
Ideal gap is 0.5-0.7, to me that sufficient? Isn't it?
I’ll go and try out now. Richer on top and lean out the bottom end.
Does the pinch have anything do with the behaviour of this engine? That's why I asked the question if it would be ok to but heat gun get it really hot to get some pinch out?
Thanks for your help. Get ready for NZ 7’s team to beaten tomorrow in Hong Kong.
If you have one of the long LSN GO carbs on there, and you lean the top end, you will get serious lean bog. These carbs tune quite differently to the Nova carb you have.
Don't worry about measuring the idle gap, set it usiing the pinch method I described in my previous post. This is the most accurate way, and works on any motor regardless of carb type etc. If the motor is still really new and has lots of mechanical pinch, you won't get the top end out of it until it's broken in. Leaning a new motor like that trying to get more top end will just kill it - real fast.