Re: Boyer ignition problem

Posted by hendred on
URL: http://silk-motorcycles.221.s1.nabble.com/Boyer-ignition-problem-tp5001882p5002087.html

Sounds like the Boyer is working ok which is good.  A few comments on the carb.  Do you know if this is the original carb fitted to the bike?  If you look in the Technical section of this site under Carburretor you will find the settings for the various carbs, including the 2038.  I believe the usual 38mm carb fitted was the 2038/302 which is a right hand 2 stroke carb.  2038/303 is a left hand 2 stroke carb and the jetting on your carb is similar to the baseline setting on the Amal website.
The choke jet and pilot jet appear to be the fitted in the wrong positions, the bigger jet is for the choke (enricher) , the smaller is for the pilot.  I now believe the pilot jet should be in the float chamber, not the body, it is prevent engine flooding - see new topic.
The spray tube is cut away on the 2 stroke carb, Amal part no 2622/148.  You will find a picture on Google.  Amal did make a special for Nortons and I believe it was used on Commandos with MKI concentrics.  

Hope this helps you sort out the carb