Replating vs. sleeving cylinders

[Katman]

Unfortunately the expansion rate was different on a wiseco to standard and it seized cracking one of the port bridges.

On the 500s the exhaust port bridge must be given additional clearance. Obviously this has to be done before the replating. Maybe whoever did the replating wasn't aware of this requirement or just plain forgot.

[Robert Taylor]

Yea im putting a wiseco in there (like every other bike I own....)

I hope the NZ agent starts off doing a better job than the ockers. I used to send a lot away and sent them to Langcourt in the UK, never a problem. Wisecos are forged pistons ( and are very strong ) BUT they do expand / grow more when hot. They require bigger clearance than cast high silicon low expansion oem. Do yourself a favour on this one and stick to oem.

[sugilite:Me]

On the 500s the exhaust port bridge must be given additional clearance. Obviously this has to be done before the replating. Maybe whoever did the replating wasn't aware of this requirement or just plain forgot.

I Did not realize I was going wiseco when I sent it away, so it was not their fault.Thanks for the info though!

I hope the NZ agent starts off doing a better job than the ockers. I used to send a lot away and sent them to Langcourt in the UK, never a problem. Wisecos are forged pistons ( and are very strong ) BUT they do expand / grow more when hot. They require bigger clearance than cast high silicon low expansion oem. Do yourself a favour on this one and stick to oem.

I too have heard bad news about the aussie workmanship. That UK outfit that you are the agent for have always done good work on my barrels and the others I know of that used their/your service. For the record I rang the NZ outfit today and they quoted more for the job than your UK based outfit!

Are you shure it was the Piston??? Not just bad plating ive heard lots of stories about the plating coming unstuck on the port bridges. Where did you get it done? ive never had any trouble and had increased performance over standard.

Absolutely no flaking on the barrel, if it were not for the cracked port bridge, I could of just whacked a oem piston in and gone again. It seized solid on the last lap of the 1st race on manfield's front straight (motard) and I'd just done a 1:18 flat, still the lap record for motard bike as far as I know. It seized BIG time. But the bore was still flawless bar the cracked port bridge, so that speaks volumes for the quality of work. Robert (poster above) warned me about using wiseco, and I paid the price for not listening. Lesson learned.

[F5 Dave]

Weird, works for me just fine, try typing the address into location bar, should work fine. or just google it, it will come up.