Hi
I have a 1959 Li 150 series 2 6v. D.C. all as original. It had been in the back of a garage for 40 years , last used 1973.
I got it 2 years ago rode it for about 200 miles but had leaking fuel problems with the original Delorto MA19 bs5 carb.
As Stickys manual i upgraded to a MA19 bs7 carb,
I fitted new rings and have just done 500 miles running in ( its been very slow going )
From cold it starts 2nd or 3rd kick now and runs smoothly up to about half throtle after 8 miles it starts to hesitate pops and misfires.
Have fitted new atomiser needle and jets ,have tried from 78-88 main jet with no effect.plug colour is too light.
Have fitted new regulator,coil, points,HT lead cap and plug.
I did a 15 mile run today 30-35 mph. after 8 miles it started to hesitate , the problem is worse when it gets hot
Is it electrical or fuel problem ?
Help appreciated regards phil