250-500cc 123 miles...Blame and redo or,,, just redo

Man.... Just can not catch a break. Sat. at Moon rocks, end of our fun ride trying to clean it out before loading up and seizeeeee. Lucky for me I was uphill from the truck this time not eight miles out. So whatda think...



Was it me, them, or just bad luck ?

Nasty!! Hate when that happens..... Lets see a pic of the plug, assuming it hasnt fired since this bike seized.

Looks to me like it ate something.

Plus 1 on it ate somthing, or lack of exhaust bridge relieving.

Actually I was WFO in 5th when it tightened up then Seized, almost went over the bars. Man this is frustrating, just want to ride you know.

That is a plain and simple lean main jet seizure. Very common.

So, how about a shot of that plug now? I'd be especially interested in seeing it if it were in fact a lean main.

OKy Doky..



Ya Ya ... I've put a few together. Did not check clearances this time figured the well known shop I used for plating and piston fitting would have made it right. The oil lube holes are there just scuffed over. I'm stumped, is it possible to have run too rich. I was still in process of jetting, it was only the third time out since rebuild completion. It had been running pretty good would have to clear it just a bit after downhills ect. The new PWK was sent to me with very rich settings due to some mistake on someones part, bike info was provided at time of purchase, but thats just part of the chain of events here. I did at least 5 heat cycles before i ever put it into gear. I now wish I had checked clearances, I have the tools.

Race fuel easy to get here too but at 8.00/gal.... I usually use Chevron 91 with Bel Ray HR1. This is the second bike that has seized with Bel Ray, maybe just a coinkidink. I cleaned everything up and it looks like the cyl can just be honed with the next over piston. How do you get the aluminum off the cyl wall. Also the power valve pivot holes are sloppy never noticed that before, quite a bit of free play. doesn't look like they contacted though. is it ok to clean out the crank cavity or should I split the cases and clean the bearings ?

Oven cleaner will take the aluminum off the cylinder wall.

I get the cylinder back this week. Cracked the exhaust bridge so had to be stripped, welded, and replated..$$$. On a good note they gave me a break on price, there are still some of us around. There is a VP station here in town (Reno) they have a 100 octane pump gas, I think it's unleaded. Is that good enough or should I go back to VP110. At least I get free gas cans with the 110. Also on the exhaust valves I picked up a new pair and was told they are a consumable item, kinda like pistons .. also found out they changed part numbers, was there a problem with the earlier valves ? Hardness, longevity..