Already replaced the front head with the rear before the problem.
I'm in Japan so I'll have to find someone locally rather than Eric Gorr. I'm sure there are people here as good, probably better but communicating with them? My Japanese skills would amount to \handing them the parts and mentioning I race and then saying 'how much?'.
Interstingly my seizure is more than 4 corner .. it basically has marks on the barrel at the edge of every port, about 8 places. Also the crown has a black sunken circle in the centre, and a seriously melted edge. I did not run out of oil, wasn't using low octane fuel. The piston is just a smear, the spark plug melted.
Interesting what you say about the pilot jets, because I'm fairly certain that the main jet is responsible for the wide open top gear seizure at over 11000 RPM, that's 180+ kph with the rear wheel locked and fishtailing round a slight bend!
I really want to do this properly. I'm going to get on a dyno, I can do plug chops, but I just feelo very short-changed since I've been trygin to be conservative with the mod.s and keep the oil injector and pilot jets to sustain reliability. My first plug chop on a dual carriageway looked great. So I go ahead and do one flat out in top as suggested and am rewarded with a meltdown. I must be doing something wrong!
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MC28 SE -sold-
MC21 with RS250 engine -for sale-
MC21 race bike -soon for sale-