Originally Posted by
grizz1
Hi Francois,
Sounds like you have one of the "Sport" motors.
The early GO two needle carbs with the long LSN all tune as you have described. The HSN stays around flush.
Set the idle gap to around .5 - .7 mm, then tune the LSN in for nice bottom end. The HSN only effects the top 5% - 10% of the power, so once you have the bottom right you can adjust the HSN for good WOT performance. Then return to the LSN and fine tune if you needed to lean the HSN at all.
With these carbs, if you start getting lean bog around the half tank mark, you are too lean on the HSN. Just richen a screwdriver blade width at a time until the lean bog goes.
Hope this helps
Thanks Grizz1 for your help
I really like Go engines
I see so should I turn out the HSN back to flush (around half a turn out from where it is now/factory setting to reach flush position) and keep leaning the LSN for more power through the bottom/mid range or should I leave the HSN as it is now from factory ?
If idle start rising up after a stop after a several seconds is it because LSN got too lean/what would be the signs of a too lean LSN? What do you think is the minimum temp to start tuning this engine?
Sorry for all the questions
Thanks a lot