Originally Posted by
Lille-bror
Hi.
How many gallons of fuel has it run?
How much nitro do you use? 0,7 mm head shims for 25% nitro and 0,8 mm (stock) shims for 30% nitro.
Are you leaning your HSN enough? Depending on which venturi you use, you can lean the HSN more than one turn (from the spot where is goes from 4 stroke to 2 stroke) before she runs too lean. You can hear she starts to sing on the straight, when you got the HSN right. If its too lean the engine will keep a high idle and say "DING DING DING", at the end of the straight, when you releases the throttle.
After that set the LSN to a steady idle. If the idle speed it too high it sounds like she is too lean.
I have run about 2 gallons with it, but it has been like this since new.
I run 25% nitro, i have not checked the shims, have never heard about that.
I use 6.5mm venturi.
The problem is that the engine not hold the tune, 5 lap its fine next to rich then lean, fat, perfekt...
I have 2 toro neros and i have tuned them earlier exactly the way you say and they runs perfekt, only needs a fine tune some times.