After getting my 500W on the road I found a couple problems, first off the previous owner had assured me the engine had been rebuilt, after digging into the project I found the cases had not been split and the bottom end needed a crank grind, shells and bearings. I finished the restoration and got the bike on the road last month, performance is sluggish, disappointed to find the front cylinder compression is 80 psi and the rear around 110 psi! So much for ever believing the claims of a previous owner, I should know better.
The piston the cylinder gap is way over spec as is the ring gap and the cylinders are over bored beyond spec.... that about sums up the poor compression.
I have a pair of new +.2mm oversize piston kits but to make use of them I will need to find a pair of good standard bore cylinders or cylinder liners that I can have bored to fit the new pistons.
Other problem was a transmission thrust bearing collapsed and this threw out the shift mechanism, burnt out the clutch discs, not sure its directly related but the shifter got stuck between 2 and 3rd and the shift pawls would not fully rotate the drum because the stack height was off due to the shot bearing. I have new bearing so I hope once fitted with new clutch discs that issue will be resolved.
If anyone has a pair of standard bore cylinders or liners that would fit the bill please email me or pm me, I am in Canada and will pay shipping from anywhere so I can make this right once and for all.
jcarey@br2architecture.com