Originally Posted by
jameslow
Got a few questions about RB ws7ll
- do i need to remove the standard plug shim? bec i find that if i use the plug with the shim, the bottom of the plug cannot sit nicely into the button.
- is there people using 16% for off-road engine? how many shim do i need to shim for this engine if im running 16% and 25%?
Thanks! As this is my first time dealing with off-road engine.
are you sure you have the right kind of plug? RBs take a "long" body plug. There are also "short" body plugs commen to O.S. engines. sounds like you have one of those.
for head shims, In your case start with .3 mm thats what rb recommends the is the minimum for that nitro content. start with a #6 plug, and go colder (#7 or #8) if your idle will let you get away with it.