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checking timing chain slack

Classic Norton Commando Motorcycles.

checking timing chain slack

Postby maylar » Thu Aug 10, 2017 6:44 am

Short of removing the timing cover on a pre-MK3 Commando, is there a quick & simple way to get a warm fuzzy that chain slack is OK? I'm thinking like putting a wrench on the crankshaft nut and seeing how many degrees of movement it takes before the ignition rotor moves. Is that logical?
Dave from CT
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Re: checking timing chain slack

Postby madass140 » Thu Aug 10, 2017 7:19 am

the advance/retard cam has its own amount of slack/slop so, on the retaining bolt would be better. keep in mind that these chains seem to have an inherent tight spot so your readings may change . Its worth a try but not sure if its a good method . post your results
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Re: checking timing chain slack

Postby olympus » Thu Aug 10, 2017 7:31 am

Take off the inlet & exhaust valve covers. turn over the motor until valve overlap at TDC.. if you have a dial gauge mount this as well
Rock the crank to & fro to see if there's any lag....
This is a very very rough guide, so removing the cover is the only real accurate way of doing it.

Malc
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Re: checking timing chain slack

Postby madass140 » Thu Aug 10, 2017 7:35 am

+1
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Re: checking timing chain slack

Postby maylar » Fri Aug 11, 2017 6:51 am

olympus wrote:Take off the inlet & exhaust valve covers. turn over the motor until valve overlap at TDC.. if you have a dial gauge mount this as well
Rock the crank to & fro to see if there's any lag....
This is a very very rough guide, so removing the cover is the only real accurate way of doing it.

Malc


OK, so basically that's watching for valve train movement while rocking the crankshaft. Anybody wager a guess how much lag there would be on a healthy motor?

I replaced the timing chain and tensioner some 7 years ago and haven't revisited the adjustment. I'm trying to convince myself it's not necessary...
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