Our 67 Atlas is a rough (in all aspects) old brute that I threw together many years ago ,over the years its been amazingly reliable with minimal attention. We have bought bits to improve the bike ,but not got round to fitting them up to now. We have decided to strip the primary side to fit a new prop stand ,clutch springs ,primary chain,raise the gearing,and look at wobbly centerstand.But nothing is going right!,The 22 tooth engine sprocket is too big to fit in the Alternator housing,The old propstand will not come off as it wont slide back past the centerstand reinforcing under the frame rail,is there a trick I'm missing?, Center stand pivots wont dismantle . If it ain't broke don't fix it!,what was I thinking.
On my last Atlas.........i…
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Thanks Phil, looking throu…
Thanks Phil, looking through the parts list alternative 22 and 23 engine sprockets listed although they can't be fitted!!. I suppose its better to increase the g/box sprocket ,I have a 42 rear (commando?) so 2 more teeth on the g/box would make a big difference .I think the bottom frame rail is bent upwards a bit which makes it tight to get the stand out. 2 axle stands a 6x2 and a sledge hammer could straighten the frame.
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I bought a new old stock s…
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Robert.......you need to t…
Robert.......you need to think carefully through the intended sprocket changes, on your bike, otherwise you may end up becoming another half-link victim.
A 22T engine sprocket will pull the gearbox forward and in turn the rear wheel as well.That is ok if you keep the 19T gearbox sprocket. Then all the standard chain lengths will be fine.
Change the gearbox sprocket up by a tooth, as well as the engine, and this will pull the rear wheel too far forward and force the fitting of a longer rear chain. Unless you fit a longer primary chain.
Bigger gearbox sprockets also tend to load up the layshaft bearings, hence the roaring trade in roller conversions.
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Thats OK Phil we have a ne…
Thats OK Phil we have a new longer primary ready to fit,and I have done the roller fix on the 99 ,so we are clued up with that. More interested in what you think the gearing would be like. Looking for a more restfull ride .To fit the 22 primary we will have to carve out the Alt housing.
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On my touring Atlas, I fit…
On my touring Atlas, I fitted a Commando Head, single carb, electronic ignition and the 22T engine sprocket. This arrangement gave easy starting plus oodles of smooth bottom end grunt and useful extra mid range power. The bonus of the bigger sprocket was to drop the revs, at 70 mph, below that nasty vibration spot just after 4,500rpm. Fuel consumption went from 45mpg to a blissful 60 plus, fully loaded and cruising at 70mph.
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Sounds ideal Phil, did you…
Sounds ideal Phil, did you have to modify the alt housing too? I suppose it might help to file down the tips of a couple of teeth and make a matching slot in the alt housing .
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On my last Atlas.........in order to fit a 22T sprocket, I had to grind away the top and bottom edges of the Alternator carrier. Had a similar issue when fitting a belt drive with a bigger front pulley.
Side stands appear to vary depending upon supplier. To get the one I bought, in place on my 650, I had to raise the front of the engine and then slide it along the bottom rail into position. It must have been a cheap pattern one because the the foot pad was not at the right angle to spread the load of the leaning bike. The toe end touching the ground first. This eventually led to the leg snapping just above the pad. A waste of time and money.