Safe fuel?

[phil110191]

hi all,
i just bought some new fuel for the Rex-x its Model Technics Big Bang i was in a rush and forgot to check the nitro %, its 30% is this going to be damaging to my engine in anyway as i usally run on 20% ive richened the air/fuel mix, what do you guys rekon?
cheers phil

[jetmechG550]

You just need to re-tune and you'll be fine. One thing you shouldn't do though is step back and forth or run the higher for a while and then go back to 20%. They say more engine wear with 30% but these tend to run better, more power and cooler with 30%.

[phil110191]

yer ive found its running with more power now, thanks Jet i can put my mind to rest lol

[rccars411]

Word is that you can step up from 20% to 30%, but never step down. Like he said, not healthy for an engine.