Hello

I have a Go 21 3 ports (it says R21 on the crank) with the blue head and long LSN, it's just broken in. Great engine
When I got it, HSN was 3 turns out from closed (so not flush but about 0.5 mm in from flush) and LSN way out of flush.

So far I tuned it the way its described in this forum
ie: set idle gap to 0.7mm (actually it's more like 0.5mm now) max and then only tune LSN for steady idle and crisp acceleration and leaving the HSN alone for the moment

I was wondering if it tuned like the GX series, if the HSN had to be flush when you start tuning the engine with very little tweak afterwards or if the HSN non flush position was the normal factory setting with these older Go engines??

I can't really go further with the LSN as idle will start to rise after a few secs when the buggy gets to a stop with 1/4 left in the tank. LSN pinch is about 4 secs at 105 degres celcius

Thanks a lot guys

Francois