400f primary drive chain

[Greenbat]

Morning,

What is the mile limit for the primary chain? I'm sure it's 40K. Mine is up to 43K and making big clattery noises...

I'm thinking of stripping the engine and doing new chains, new rings, regrind valves, valve stem seals, gearbox bearing and replace any other seals I see. Can anyone think of owt else worth doing? Camchain adjuster should be OK, it was tackled a few years ago.
Finally, you can't get primary guide rubbers. Is it recommended to shim them up a bit if they're worn? Be nice to shut the rattles up, at least for a mile or two.

[Bryanj]

At least the 400 has rubbers!! the 500/550 has nothing. Chains can be knackered at 20,000 or good at 60,000+ depends on how good a state of tune the engine has been kept in, lots of clatter suggests too low a tickover and unbalanced carbs BUT balancing is the LAST of the service items

[Greenbat]

I had the sump off and it did feel pretty loose, I got a new one in some parts and it feels loads better. It has a non standard silencer, once I know the chains are good I want to get the carbs fully cleaned and set up for it.

[Bryanj]

The 400 has rubber cushions on both chain runs like on the Goldwing as well as the hub dampers(same as 500 by the way) and the 650 conversion has been done but it requires a good and accurate welder

[Bryanj]

Think it has an oil feed to it as well mate

[fisjon]

The last 400 engine I rebuilt had a 500/550 cam chain guide in it!