Originally Posted by
sky510
hi guys just a newbie on go motors and seems to be they are a good choice anyhow..was looking for shimming the motor namely the Go 5 port Turbo head. The motor has roughly 2 gallons as far the seller told me and did a check up today and measure the shims installed are 0.20mm (2 pcs) any how Im planin to run 30% nitro and 10% oil are the shimming good or if I try to run just 20% what shim will be appropriate? another question is what are the default needle setting for the carb? I haven't touch them yet just in the process of cleaning the motor and checking it.
Hoping you can share a bit knowledge for a newie like me
thank you
Hi Sky510, 22 Racer has sorted the shiming out
As far as the needles go it depends if you have the long LSN needle, the older short LSN needle or the newer intermediate LSN needle
Don't panic it's not to hard.
To check which needle is in your motor remove the air filter and look down the carb throat while slowly opening the throttle slide. If you have the old short needle the LSN needle will pull out of the spray bar before or at half throttle.
If you have the new intermediate needle (Gen5 motors only) the needle will only pull out of the spray bar towards full throttle.
If you have the long LSN (most likely in your case) the LSN remains in the spray bar right through the throttle range and is still in the spray bar at full throttle.
OK - for the long LSN set:
HSN to
half a turn in from flush (doesn't seem much but this is correct. It's to do with the needle staying in the spray bar at full throttle).
LSN to 2.5 - 3 turns in from flush
I have the long LSN in my 5 Port and have HSN at .5 in from flush and the LSN at 2.75 turns in from flush. Perfect for my set up.
For short LSN set:
HSN 2 - 2.5 turns in from flush
LSN 2.5 - turns in from flush
For the intermediate needle:
HSN 1.25 - 1.5 turns in from flush
LSN 2.5 - 3 + turns in from flush
I have the newer intermediate needle in my 7 Port, and have HSN at 1.25 turns in and LSN at 4.25 turns in with the fuel and pipe I am running, and motor is performing real strong.
Start at the richest settings and work your way in as you go. The GO engines do favour a slightly rich top end and fairly lean bottm end.
Check out page 131 on this forum - posts from Massive Mods and Retro RC on needle settings.
Hope all this makes sense and is of some help
