05-11-2017, 11:59 PM
Robin, Derek,
I endorse the suggestion of starting with a new jet.
For comparing needle profiles take a look at the excellent http://www.mintylamb.co.uk If you want to get very exacting but don't have access to a rolling road (my nearest is miles away!) set up a camera pointing into the carb inlet to record what stage (height) your needle is sitting at for various revs. By using roadside adjustments to the mixture, this allows you to calculate quite accurately how rich or weak the needle is at each stage and choose a more appropriate one.
Peter.
I endorse the suggestion of starting with a new jet.
For comparing needle profiles take a look at the excellent http://www.mintylamb.co.uk If you want to get very exacting but don't have access to a rolling road (my nearest is miles away!) set up a camera pointing into the carb inlet to record what stage (height) your needle is sitting at for various revs. By using roadside adjustments to the mixture, this allows you to calculate quite accurately how rich or weak the needle is at each stage and choose a more appropriate one.
Peter.