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Mag chain madness

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Mag chain madness

Posted by George Phillips at April 20. 2017
My mag chain goes from slack (

Re: Mag chain madness

Posted by Jonathan Soons at April 20. 2017
Previously George Phillips wrote:
My mag chain goes from slack ( 1/2") to really tight as I turn the engine. I've fitted a new inlet cam bush so would guess that that end of the chain is running true so the only other culprit must be a wonky armature shaft? Or dodgy sprockets? It's a new chain. Any views? Cheers, George
Don't use the greater-than or less-than symbols. They will give trouble unless properly escaped.

Re: Mag chain madness

Posted by jonathan_newton at April 20. 2017

George, either something has gone ecentric or you got some solid links in the chain.  Rotate the relative shafts individually and observe any ecentricity relative to a set point of your choosing.

Ensure your chain is 360 degree flexible, then test the link if it has one; set it in the chain and run it over your fingers in both directions to ensure complete movement of the chain and the joint.

Failing that, check your mag platform hasn't cracked......

 

Jon

 

Re: Mag chain madness

Posted by George Phillips at April 20. 2017
Thanks Jon. hadn't thought about the mag platform. George

Re: Mag chain madness

Posted by colin_mosley at April 20. 2017

If the key on the drive sprocket is too tall or not fitted correctly, this will make the sprocket run out of true.

Colin

Re: Mag chain madness

Posted by George Phillips at April 20. 2017
Something else to check. Thanks Colin.

Re: Mag chain madness

Posted by Barry Carson at April 20. 2017

its gone a bit grey

Re: Mag chain madness

Posted by les_howard at April 21. 2017

Is this new dark colouring NOC's attempt to emulate the "Access Norton"s Web Site?   :)

People often do not compensate with the appropriate back pressure rotation when measuring chain tension. This is profound with the high loading of the camshaft timing chain but still applies to the weaker rotational loading that a magneto creates, Trick is to rotate the DRIVEN sprocket/gear TOWARDS the turning force direction(to oppose it) that the chain is creating at at any time...then measure the slack....Les

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