Hi Goat
Good to hear from a fellow Norfolk man once I have got the bike running right we will have to meet up sometime.
I did ride it back from the mechanics shop in fakenham & I was a bit nervous about the fueling because it has a aftermarket exhaust can as well as running rich and spitting unburnt fuel out of the can so piston damage would be the worry.
I will get it sorted on a dyno and jetted right.
Old-codger thanks for the link to the carb parts & it confirms the part no,s that I need for the jetting. The bike is a 1986 su Derbel? It is in good cosmetic condition & was a conservatory item that was started every 2 weeks ( yeah right), top end rebuilt but used the old nuts on the head so not to sure about that & the de- compressor was cabled incorrectly so I had the front brake rebuilt because it was completely solid but the bike would roll & the lever travelled to the handlebars & the engine checked over.
Then I will need to deal with the creeping thottle .
Any ideas?
Hopefully this will help the starting & stop it being a bit rich & over fueling.
Cheers bert