CB 500/4 Classic Racer

[wislon]

We currently run a 500 in the local (S Africa) classic class. Looking for a "big-bore "
kit (605-610). Yesterday it was mentioned that early XL 125 - 175 pistons would work
Can anyone confirm that the cudgin pin to crown heights are the same and that the cudgin pin dia would be the same

[SteveD CB500K0]

Hello mate and welcome.

Most of us are in the UK here (with a smattering of Americans and others)

605 kits come up on eBay every once in a while - usually being auctioned by David Silver Spares! You could do worse than call or email them about availability as they don't usually put that stuff up on their site:

www.davidsilverspares.co.uk

One the subject of 125/175 pistons and gudgeon pin sizes, our resident expert is Bryan Jones. You can email him on bljATblj.org.uk

Here's a full Dresda/Yoshi 500/4 sprinter (drag bike) that campaigns around the UK.

[Bryanj]

To go 605 you use modified standard CB750 pistons but the liner gets VERY thin at the bottom--better if you get 550 barrels but you MAY have to open up the crankcases, seems to be a bit of inconsistency as some fit straight on and others dont