Crankshaft Nut When fitting Alton Electric start

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john_price

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Oct 17, 2013
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Hi I have fitted the Electric start kit all going well until it comes to putting on the Crankshaft nut, mu original can be put on by hand and threads on and off very smooth , howeve the nut supplied by Alton grips then stops , I do not want to force it and damage the threads on the crank, has anyone else had this issue the bike is a 750 Mk5 1973 , I have emailed Alton and I am waiting for a reply
 
john_price said:
Hi I have fitted the Electric start kit all going well until it comes to putting on the Crankshaft nut, mu original can be put on by hand and threads on and off very smooth , howeve the nut supplied by Alton grips then stops , I do not want to force it and damage the threads on the crank, has anyone else had this issue the bike is a 750 Mk5 1973 , I have emailed Alton and I am waiting for a reply
Click to expand...
Have you had a response from Alton??
 
Just a thought but try oiling it and putting it on backwards to test the threads. It my just be stiff which is not a bad thing.
If successful, clean all traces of oil and try the correct way on...

Dennis (with Alton)
 
As long as it is not cross threaded, be brave and tighten it to 70 to 80 ft lbs and use red Loctite as you do not want it to come loose. I fitted an Alton kit on my wife's MK2a about 4 years ago and it has been excellent.
 
Metisse11 said:
As long as it is not cross threaded, be brave and tighten it to 70 to 80 ft lbs and use red Loctite as you do not want it to come loose. I fitted an Alton kit on my wife's MK2a about 4 years ago and it has been excellent.
Click to expand...
I dunno… depends just how tight we’re talking I’d say…

The problem with a really tight thread is that it will consume torque. So even though you do tighten to 70-80 ft lbs you are not applying 70-80 ft lbs OF CLAMPING FORCE. And because you don’t know how tight the thread is, you don’t know what clamping force you actually have.

As the Alton relies on clamping force for the starter, I would say this would be building in a potential issue for the future.
 
Last edited:
Since Paul left us, responses from Aton have been sporadic at best.
When installing mine I expienced a "Tight spot" when running the nut.
The internal threads appeared sound.
But even after removing the sprag and attempting to fit the nut the other way around..it still encountered the tight spot.
After contacting Alton, they eventually relied and I obtained a replacement from RGM, from whom I purchased the kit
The replacement fitted perfectly, so there are definitely poorly threaded nuts out there
 
As Fast Eddie says the clamping for force on all components is critical, and having tight threads will significantly reduce the applied clamping force
 
I’ve just realised that this thread is one and a qtr years old… and John the OP never bothered replying or updating us all.

Sad innit ?
 

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