Thank you ADJW thumper for your reply.
I have renewed the valve needle and valve needle seat.
Sorry i didn’t mention this.
Just checked again with the transparent floatbowl cover and this works as it supposed to work.
I have tried the following jetting.
Standard setting
MJ 240 - NJ 106 - PJ 25 - cutout 3.5 - needle 3 from top
Sparkplugs black, doesn’t pull fluidly
Smaller setting
MJ 220 - NJ 105 - PJ 25 - cutout 3.5 - needle 2 from top
Sparkplugs black, holds in
Bigger setting
MJ 250 - NJ 107 - PJ 25 - cutout 3.5 - needle 2 from top
Sparkplugs black, to much fuel to handle
Kind regards,
Piston Jockey
When trying to sort out a carb, it's best to vary only one setting at the time. Also, you have to be careful when interpreting plug colour because if you go out for a ride and come back and let it tickover, the plug colour can end up being a function of the pilot circuit only. To determine the plug colour for the bigger throttle openings, you need to run it for some distance at that throttle and then stop the engine quickly. It would be good to determine the differnce in the plug colour for at least a couple of throttle openings.