Issues and big bores!

CLASSIC RIDE Issues and big bores! So you want to work on an RG400/500, eh? Well, experts say it’s the closest thing to a pukka racing two-stroke engine and with that in mind, there are a few things to watch out for! You will need a long-series 6mm Allen key socket to reach the barrel retaining bolts which are down inside the barrels. Also, get the engine on the bench and check the threads of the head studs in the barrels. These are well known for stripping, so before removing the heads loosen each head nut a couple of turns and torque it back down to 18ft-lb to make sure the threads are okay. Check the head. There should be a step in the head where the combustion chamber meets…

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Classic Motorcycle Mechanics (Digital) - 1 Issue, September 2021

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