Richening the mixture

[Dylan]

Is there any way to richen the mixture without changeing the jet??? (or is it easiest to change the clip position).

Thanks
Dylan

[Kickstart]

Hi

Changing the main jet affects the mixture for about the last 1/4 of the throttle opening. The needle (and swapping the it mounts on) affects (or is that effects, never sure, oh well) the 1/4 to 3/4 throttle range. The mixture screw affects the first 1/4 of throttle opening. There is a bit of overlap of course.

Lots of different needles are available to tailor the mixture more carefully.

All the best

Keith

[Dylan]

OK then...... I was just thinking that as it wont redline in top then maybe a bit of extra juice in the last 1/4 turn may help... Need to change the main jet then??
Thanks
Dylan

[Kickstart]

Hi

Yes, for that last bit of throttle you need to change the main jet. They are fairly cheap. The Dellorto importers are:-

https://www.racecar.co.uk/dellorto/

Give them a ring. For about £10 they also sell a pair of books on carbs which are useful. One is colour and cover the basics of carbs, but is in Italian English, the other is just the sheets explaining the various carb sizes (such as the exact dimensions of all the different carb needles that are available).

I doubt that increasing the main jet size will help you rev out more. If it is running that lean it would have a serious risk of having seized, and most bike makers (for 2 strokes at least) tend to jet slightly rich for safeties sake.

All the best

Keith