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Dear all, I would appreciate some guidance with this one.
It's not very easy to see from the attached photo but I can't turn the welded adjuster nut because it fouls the big axle washer.
The adjusters are after market stainless steel items.
I would have thought that with everything slackened off I should be able to fine tune the chain tension in the normal straightforward way.
Thanks Roger
Simple plan
Turn the o.d. of the washer to just clear the hexagon on the adjuster. Not much would need to be removed looking at the photo.
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Either the wheel spindle nut…
Either the wheel spindle nut reduced section diameter is too small or the end stop on the adjuster bolt is to short.
Have you though of chamfering the edge of the adjuster bolt hex that's catching the washer?
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Change the adjusters
Hi,
I'm sure the originals had a reduced size hex to overcome this issue - featherbed ones certainly did. Surely one of the various parts suppliers has them with the correct thread for a Commando?
Regards,
George
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Lateral Thinking
How about a 0.10" smaller diameter washer under the head of the axle. That should give the adjuster hex nut enough clearance all round.
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The original...
The original adjuster bolt had a 1/8 Whit head. Nasty fiddly thing. Any improvement in this area must be worthwhile. (Royal Enfield snail cams come to mind)
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Featherbed and Commando different
Featherbed frames used reduced head adjusters but Commando doesn't. The head should be 1/2 inch AF. Either take some metal off the washer or off the edge of adjuster hex nearest spindle.
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Aftermarket junk
On my 1974 850 MK2 the chain adjuster head size is 7/16" and the lock nut 1/2" spanner fit.
This is as fitted by the factory and correct as I've owned the bike since new.
You have aftermarket junk, send them back for a refund.
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Rear Wheel Adjusters - Photo Evidence
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sorted
Those are the correct chain adjusters you need, 7/16" spanner size on the adjuster head, designed to clear the axle washer.
Sorted.
https://andover-norton.co.uk/en/shop-details-2/15347/rear-wheel-adjuster
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Alan; Would you have a…
Alan; Would you have a pattern for the R.E. snail cams? Thank you. Mark
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Here are some numbers from…
Here are some numbers from original parts on a 1974 850 Mk2a:
- Diameter of spindle at adjuster: 0.86"
- Diameter of spindle washer: 1.125"
- Height of adjuster bolt beyond hex 'nut' towards spindle: 0.15"
- Adjuster hex size: 1/2" AF
From your picture, it looks like the spindle has been reduced too far. You could modify the adjuster by turning (as in - in a lathe) the hex 'nut' back to give you the clearance you need.
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Feked sells snail cams….
...for three spindle sizes. Yes they are metric, but one of the sizes may be close enough.
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