Need help on factory engine settings..21

[Jer_ry]

Does anyone here know the factory engine setting on a novarassi .21? Thats all i know about it. It ran fine when i first got it used but now it's not acting right. The guy i got it from used to race it, but if this dosent work i might need a new engine. If it helps it's on an MBX 4 not sure if it came from the factory like this..Thanks.

[CorradoPsi]

HSN=2.5 turns out
LSN=3.5 turns out
MSN if is has one=flush with carb body.

before you really screw with your tuning, check the condition of your engine. when its cold and the plug is out, is there any resistance to turning the flywheel all the way around? when its hot and the plug is in, is there any resistance to turning the flywheel all the way around? have you checked for air leaks in your fuel system? have you checked the condition of your pipe? is your clutch in good shape? is your air filter clean? these are all things that will cause erratic running conditions.

[Jer_ry]

Thanks for the info. This is my big bro's engine and he has already messed all with the tuning in the past month. Thats why it's not running right i believe it was doing good till he funked with it now he can't get it back to how it was. But i'll definately check all that other stuff out. Thanks!