Navigation

You are here: Home / Messages / Heavy Twins / electric start for atlas

electric start for atlas

Up to Heavy Twins

electric start for atlas

Posted by dennis_cannings at January 02. 2018

I have an Atlas, which at present I can still kick over and start OK. Looking to the future, I am wondering about the possibility of fitting an Alton (Commando) starter to it. I dont know if it is easy to fit the alloy chain case on the featherbed setup. I dont know if the distance between the shaft centres is similar and the footrest would need an alternative mount. I  just thought I would throw it out there to see if anyone else had considered it as an option and what other difficulties would I be likely to come across.

 

 

Re: electric start for atlas

Posted by ian_soady at January 02. 2018

I believe the shaft centres are different and of course the Commando tilted engine makes the front end fittings different as well.

It might be worth contacting Alton who by all accounts are helpful (although I have to say I was not impressed by the Alton generator fitted to my Venom).

Re: electric start for atlas

Posted by anna jeannette Dixon at January 05. 2018

Previously dennis_cannings wrote:

I have an Atlas, which at present I can still kick over and start OK. Looking to the future, I am wondering about the possibility of fitting an Alton (Commando) starter to it. I dont know if it is easy to fit the alloy chain case on the featherbed setup. I dont know if the distance between the shaft centres is similar and the footrest would need an alternative mount. I  just thought I would throw it out there to see if anyone else had considered it as an option and what other difficulties would I be likely to come across.

 

hello harley clutchs are need the same dia as nortons and the do a pre =engage starter this gose direct to the ring on the back of the clutch all 12v and they do belt drive kits to harley parts are very well made,  look up  harley parts  yours  anna j

Re: electric start for atlas

Posted by dennis_cannings at January 06. 2018

Previously anna jeannette Dixon wrote:

Previously dennis_cannings wrote:

I have an Atlas, which at present I can still kick over and start OK. Looking to the future, I am wondering about the possibility of fitting an Alton (Commando) starter to it. I dont know if it is easy to fit the alloy chain case on the featherbed setup. I dont know if the distance between the shaft centres is similar and the footrest would need an alternative mount. I  just thought I would throw it out there to see if anyone else had considered it as an option and what other difficulties would I be likely to come across.

 

hello harley clutchs are need the same dia as nortons and the do a pre =engage starter this gose direct to the ring on the back of the clutch all 12v and they do belt drive kits to harley parts are very well made,  look up  harley parts  yours  anna j

Re: electric start for atlas

Posted by dennis_cannings at January 06. 2018

Thanks , I will look into this.

Re: electric start for atlas

Posted by anna jeannette Dixon at January 08. 2018

Previously dennis_cannings wrote:

Thanks , I will look into this.

in my Harley Davidson parts catalogue, they do the gear ring as a separate item  and with some engineer can be made to fit a Norton clutch and can be fitted from the bottom rear of the gearbox with some modifications  good luck with it all  yours anna j

Re: electric start for atlas

Posted by tony_harris at January 20. 2018

I have a Commando engine in Dommi frame. I have fitted a Harley 888 1.4KW starter. I use Commando chain cases. I had a ring gear made to fit into the Commando case and it has less teeth than a Harley starter. cant remember exactly but about three less I think. If you use a Harley one it will be to big.

I also used a belt drive and attached the ring gear to the back of the clutch.

I wrote an artical for RH with pictures a while ago. It is not a straight forward job. It requires a fair bit of engineering, however it's worth it.

The starter was £35 off ebay and I had two gears made for £55 the pair I turned them and had the teeth cut.

Re: electric start for atlas

Posted by paul_standeven at January 20. 2018

I note that the installation above was done with a Commando engine and primary drive.  The primary drive is much shorter, and may create enough space to allow the ring gear and starter installation.

With an Atlas engine and frame, there is no space behind the clutch for such a ring gear (have a look at the clearance between clutch and inner primary cover), You simply could not fit a starter motor below / to the rear of the clutch, because it would require cutting away the frame very close to the rear fork pivot.  Not a very good idea....  Even if you could mount the starter motor somewhere more practical, like above or ahead of the clutch, it simply is not viable

The Alton starter, ie a motor within the primary drive cover driving a chain or belt, is a much more realistic approach.  Note that there are other engineers making starter motors on the engine mainshaft as well.

Paul

Re: electric start for atlas

Posted by Chris at January 22. 2018

 

Sounds like an awful amount of trouble to get electric start. What kind of condition is the Atlas in? I would consider selling it and getting a nice Commando with electric start.

I am in the same boat with 84 XR600. That big single can be a bear to start and my knees are not what they used to be. Its for sale now and will probably turn into a newer XR with electric start. Luckily the Dominator starts easily.

Ever see an electric start for RC airplanes? Saves the fingers.........

I have envisioned a version big enough to turn over a twin. Obviously you would have to have a compact battery powered version so it could be easily transported. A one way cone on the crank would be engaged by the starter, turning over the motor. I suppose it would have to be a bike with belt drive but perhaps there could be a sealed shaft through the primary cover with the cone on its end. Open primaries would be the easiest to deal with, may not need a cone. I think the BDL belt drive on my old shovelhead made me think of it originally. The big ass pulley on the end of the crank would be easy to spin with such a device. Sometimes I daydream too much.........

 

Chris

Re: electric start for atlas

Posted by Barry Carson at January 22. 2018

be good if you could fit some sort of dynastart

Re: electric start for atlas

Posted by David Cooper at January 22. 2018

Decompressors were standard fitments to motorbikes of only 350cc. But since a 500cc twin is only a pair of 250 singles, the manufacturers must have assumed they were not needed.

But then the engines grew. And compression ratios shot up. A 750cc Atlas surely justifies a decompressor, doesn't it? Is it feasible? Or don't they work very well with two cylinders?

Must cost less than an electric starter.

Re: electric start for atlas

Posted by robert_tuck at January 22. 2018

It should be possible to install twin decompressors into the exhaust valve inspection covers or possibly some form of eccentric rocker spindles . I can't start the Atlas with the HC Commando pistons. I have no trouble with a 500cc Ulster single though.

Re: electric start for atlas

Posted by david_evans at January 23. 2018

I have seen a system where their is a decompressor fitted to the cylinder head that involves drilling the head near the spark plug. Bit drastic, however spark plugs are available with a decompressor built in. Press the two plug buttons, kick it into life and the plungers pop back into closed position.

Re: electric start for atlas

Posted by david_evans at January 23. 2018

"EZ Release" by Wimmer, primarily designed for Harley Davidson. got to be worth a shot

Re: electric start for atlas

Posted by ian_soady at January 23. 2018

Enfields had a separate decompressor rather than a valve lifter. If you need the facility this might be a better route although AFAIR it did need a passage into the exhaust port.

Re: electric start for atlas

Posted by David Cooper at January 23. 2018

Cannot find EZ release on their site.  Maybe it's gone?

Somewhere else describes it as 'retarding ignition' - looks like a journalist lack of understanding.

 

The awkward problem with fitting valve lifters to Norton twins would be finding a way to stop push rods from jumping out of place.  The more I think about it, the more difficult that looks...

 

Barry's Dyonstart suggestion looks attractive - before I realised that I don't think the timing gear would put up with the loads!

Re: electric start for atlas

Posted by robert_tuck at January 23. 2018

Never thought about the poor old pushrods!, just as well I'm not designing a V6.

Powered by Ploneboard
This is Brio Diazo Plone Theme