Gen

iTrader: (13)

hi ,,,i have a axe rossi cobra and it used to always get stuck tdc when still new i installed another shim .001 on top of .002 it was then easier to start but its had some fuel thru now nad never gets caught tdc and i would like to remove .001 shim to get more compression /power and take back to stock 1 shim can i do this ,,,im just not sure if like ,me engine has been broken in with 2 shims if i can go back to 1

skeller

iTrader: (11)

What % of nitro do you run...and how much has been thru the motor?

houston

iTrader: (96)

not a problem gen , just have to retune a lil. check to see that you dont have too much pre detonation (carbon on top of piston) too hot of plug or too lil shim . are you noticing low compression , lack of torque from the engine ?

ezveedub

iTrader: (17)

How many gallons through the engine so far? Also was number is on the head insert next to the glowplug? Should be a 3 and most likely a standard glowplug. As for the shims, what measurement are you using, inches or MM? I assume you got the decimal wrong and meaant 0.010mm & 0.020mm shims.

Gen

iTrader: (13)

SKELLER use 25% and run thru 1 1/4 gallon
HOUSTEN not noting low compression ,,just remember more power ,,also when removing shim just as a guide would i be richening a little and leaning bottom a bit ???
EZVEEDUB ,where did that name come from ?fuel used 1 1/4 gallon number under head ,,what is that for ??,,i do have standard plugs,,and yes got decimal wrong ,,thanks so far any help greatly appreciated

ezveedub

iTrader: (17)

The number on the head is the combustion chamber size. With you 0.30mm shimming, it should run with 30% fuel. If you take the shim out, you should be able to run the 25% but make sure it doesn't run hot or detonate.