Not too sure I'd run a clearance of under .03 having 4 point seized at over that. Personally I like to see the .04 gauge fit down there. _________________ Please do not PM me technical questions, if you can't find it on the Forum start a thread
It lists the ring end gap to be 30-45mm with the service limit at 50mm.
Fonty thanks for the suggestion, this is the kind of info I'm looking for. I know you guys on the other side of the pond do a lot more racing with these bikes than we do here and a racer specification is usually different than the stock specification.
Matt@TYGA wrote:On my race 28 we used to run an "A" cylinder with "D" piston for fast tracks (0.047~0.053mm) and a "B" piston for short tracks (0.039~0.045mm). The reason was that at fast tracks the engine could be held flat out for longer and the bigger clearance piston allowed for this with less chance of nipping up. The tighter piston on short tracks was at peak rpm for only a short time so wasn't a problem.
_________________ Please do not PM me technical questions, if you can't find it on the Forum start a thread
Something I've noticed about you guys is that I don't hear much about plating as a means to get the clearance. I've seen multiple posts like the one fontyyy posted with guys using an "B" cylinder with a mismatched piston to gain the clearance you're looking for. I see a lot of guys looking for good used cylinders to rebuild their engines as well instead of just having what they already have replated.
I'm having some cylinders plated right now and the reason I asked is because I can have them give me the exact clearance that I request. I'm not racing but for sure wring it's neck in the canyons as I ride with guys with liter bikes most of the time. That post from Matt is the biggest clearances I've seen posted so far even for short tracks. Dude knows what he's doing but I don't think I should go that big for the street.
I'm going to ask for .035 and see how it works out.
In my experience 2nd hand barrels are considerably cheaper than replates.
Added to that I've NEVER seen o.e. plating do this. _________________ Please do not PM me technical questions, if you can't find it on the Forum start a thread
Wow, are you sure that was plated or just painted with chrome color paint.
Plating at one of the top companys here in the U.S. is $175 a barrel. For us to buy a used barrel and then have it shipped because it's probably somewhere else in the world is about the same. Plus a used barrel is possibly no better than what I already have.
It's your call, personally posts like this scare me. _________________ Please do not PM me technical questions, if you can't find it on the Forum start a thread
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