Is there a way of identifying the camshaft while it’s still in the bike?
Genuinely asking for my friend that bought a bike that was apparently raced, he has been going through it and has difficulty getting it going, he is concerned that there might be a race cam inside but the thought of stripping the engine again is leaving him really dejected.
If we don’t have any luck, is there any experts in the Aldershot area that would be willing to pop round and give an opinion.
I’m a Norton novice, my friend is 88 and had Dominators for a few years.
Stick a timing disc on the…
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Where do I find out about…
Where do I find out about the cam lift ratio?
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You compare the distance…
You compare the distance from the pushrod centre to the rocker spindle centre and the the rocker spindle centre to the valve adjuster center.
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Thanks John, I have another…
Thanks John, I have another evening in the shed.
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It does look to be 1:1.1…
It does look to be 1:1.1 ratio
https://www.accessnorton.com/NortonCommando/checking-cam-lift-specs-at-the-rockers.20898/
A stock MK3 cam has around .330 lift at the lifter.
X 1.1 rocker ratio ratio makes it .363 at the valve. Approximately.
But worth a quick check in case someone has fitted offset pushrod locators
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Why suspect the cam, no one…
Why suspect the cam, no one so far has invented a Commando cam that does not allow a Norton Commando to start. Though some claimed the latest PW cam I have fitted would not work as it pushed the boundary out further. Is it getting fuel, does it have points, if so are they wired correctly, is the ignition timed correctly, does it have compression. These are the simple things I would check before questioning the cam.
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Don't forget to measure the lift as well as the timing
Whatever the role of the cam in your friend's starting problem, it is surely worth investigating the cam properly in any case.
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Getting it started
Hi
I am local I live in Ash. The bike should run race cam or standard, If you would like a hand getting it started send me a message.
Regards
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Stick a timing disc on the crank, take the rocker covers off, set the clearances to the normal checking figures, DTI the valve lift and chart. What you will also need is the rocker ratio so you can covert the valve lift to cam lobe lift, could be 1.1 to 1 but its needs checking.