Originally posted by ziggy12345
I have the Novarossi RR12L5 long stroke engine fitted to an Fw-05 with JPL 6mm pipe.
I'm running 16% Nitro and a No 5 Novarossi plug. The head clearance is 0.018" (It has a 0.3mm shim in)
The engine doesnt seem to have any top end power. I have toi use the lowest top end gear to get it to rev out. If i use a taller gear it doesnt get to top speed.
I need about a 15% increase in power. Anybody have any idea what could be the problem? Motorman?
There are a few options for you!
1. go with higher nitro content
2. what kind of weather in your area? if it is hot and humid then you need to use colder plug.
3. if you go higher nitro, then you need to increase headshim, trust me you really need extra headshim! I had bad experience with headshims. if you dont run enough headshim on 30%, it will be over compressed and crack the piston!