Re: Boyer ignition problem

Posted by hendred on Nov 21, 2020; 11:09am
URL: http://silk-motorcycles.221.s1.nabble.com/Boyer-ignition-problem-tp5001882p5002091.html

Sorry I got the pilot jet position the wrong way round, it should be in the body to prevent flooding.  I believe the 622/075 is the spray tube for a MKI Concentric. 2622/148 is a spray for a MKII.  For some reason Amal don't list the spray tube as a spare part on the exploded diagrams but you can find them if you know the part number. I found a picture of the 2622/148 on a US part suppliers site.

The Amal comment about not being involved with Silk settings explains the baseline setting of your carb.  The main difference between Silk and Amal settings is the smaller slide cutaway, bigger main jet and I think a different needle. As I said earlier it is all in the technical section on this site. The slightly larger slide cutaway may be beneficial on modern fuels as my bike tends to 4 stroke at very small  throttle openings with a 2 1/2 cutaway.

 Do you have original manual supplied with the bike?  Not much help with carb size or jetting but it would be interesting to know what ignition advance setting recommended for your Silk.