Sprag clutch set up

Hi David,

The 50 lb torque is the slip torque, not the torque on the nut. Seehttp://www.oldbritts.com/e_start_backfire.html

By the way, is the bike backfiring and destroying the sprag ?

If you have electronic ignition (mainly Boyer) then the low voltage during starting can cause backfires. I have a cure for this which I have been testing this season so far without problems. I will write a report soon.

Regards

Tony

Hi DavidI followed the oldbritts article by welding an old socket onto a thrust washer - 50 ft-lbs is correct. My mk3 original was only 36 ft-lbs and spun out too easily on engaging the starter. Another one I had was 48 ft-lbs & I have fitted that at present with a new 18 sprag unit (there are 14 piece units also around). It is imperative that the engine sprocket and starter gear are within tolerance. The starter is a 4 brush coverted standard unit - all is working sweetly at the moment (touch wood).Cheers Alan

Hi Dave,

Yes this is basically what I have, my solution will run from 6V to to 36V and give a steady 12V output. Bit overkill I know but it does the job. It also uses an 'off the shelf' item.

One thing that concerned me when implementing this solution was that I waseffectivelyregulating the 'earth' line. My brain started to hurt trying to work out if it did not make a blind bit of difference.

Your solution and mine both seem reliable so that has seems to haveanswereditself.

I shall probably do a write up for Roadhlodershamelesslyplagiarizingyour article.

Cheers

Tony