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Merry Christmas BTW! :D

Yeah it seemed okay when it was cold (5C) on a 172, then it warmed up a bit (10C) and a plug chop on a 170 looked just like the 172 but sometimes held back at around 8.5k. So I went to a 165 (and added some timing advance at the top - not sure if that's made any difference) and then it would rev...

So I'm down to 170 now and looking like this: Definitely better but I still get an intermittent stumble at about 8.5k before it takes off again to 10k or so. It's come back since the weather is slightly warmer (~10*C) So I'm thinking I'm still good to keep going down? Other than this...

Thanks for the advice Awk. I went down to a 172 and now it revs upto the limiter (10.5k) scary fast. Its about as cold as I'm happy to ride here atm (5*C) so I'll plug chop tomorrow to see how it's looking :)

Thanks for the reply. That's exactly what I needed to hear. I will go down 1 size at a time and test. And I'll keep an eye on ambient temperature. This is built only for road riding so I'm wide open for extended periods. So I know I gotta be careful but I can't sit full throttle atm coz it...

Hey guys, Hope you can help me please. I'm sure I know the answer to this but I'd just like some reassurance please before I kill my top end. I have just fitted a PWK33 on my 212cc stroker motor and when I'm WOT flat out (and sometimes when when I whack it wide open) I get a bit of a...