Originally posted by InitialD
Have you checked your clutch? Perhaps the clutch shoes are touching the clutchbell when you brake or slow down.
Else, have you tried changing plugs? A colder 7 plug perhaps? What % of nitro are you using?
InitialD,
The clutch is fine, no problem. Cold plug? could be, let me also try, nitro is trinity 20%.
I have another rs12s5 engine in my ntc3 using plug 6 and 20% fuel but no problem in idling. But then again, the crankshaft is the
original one.