mikeburgin
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flash said:corado- I've had both. i hated the 421b. with as many motors as I've tuned i will say that was the worst of all of them. .
Funny you should say that flash,i reacon its as easy to tune as the RBs or any other motor I've ever had.
maybe your 421b had probs......... maybe its head was under shimmed, normally to much compression meaqns you have less tolerance for tunning. novas engines are shimmed for a little higher altitude, like about 400mtrs ASL, when i run in auckland nzl at sea level i have to put an extra shim in or i have tunning probs as well.