fuel % question

[HSPbackwash]

I broke my 18cxp nitro engine with 20% fuel. I got it tuned by my LHS and they tuned it on 10% (my manual says to run it on 20%). I've been running it with 10% for a while but i what to change back to 20%. Should i just set the needles back to factory settings when i run it on 20% or what???????????

 

[basketcase45]

Yes, that should do it. Of course you will have to tune it for the weather conditions. You don't have to be afraid to tune your engine, and in fact is a daily deal if you are tuning for optimum performance. Think of the screw setting as a clockface; move the screw needle 1 hour's distance at a time (very small increments) untill the engine sounds right. If you have a temp gauge, just try to keep the temps under 250 degrees. But don't tune for temp, rather, tune it to where your engine sounds right. It takes practice, but is really not that hard to do. Send us some pics if you can't make it work, we will do our best to help.

 

[HSPbackwash]

ok thanks ill send u a pic if it doesn't go right

oh and just another thing because i am at the moment runnning it on 10% fuel should i be runnning it alot richer. Thats what i have been doin.

 

[basketcase45]

ok thanks ill send u a pic if it doesn't go right

oh and just another thing because i am at the moment runnning it on 10% fuel should i be runnning it alot richer. Thats what i have been doin.

Not a LOT richer, maybe 3 or 4 hours at the most.