Perhaps if you knew a little about Dellortos and helped someone with a specific problem instead of posting a "general" link you'd be more useful than a chocolate teapot.
Whilst it may or may not refer to karts its not much help in this case.
Yes ive checked my gauge and its 18.5
I ve used this setting (ever since my sherco days) and found it to be spot on.
Ive had several 315's go through my hands recently and these all go well at this.
Please try and let us know
Most Gas Gas bolts are very good now, fair to assume now Torrot have taken over they will be better or consistent in quality. I will let you know shortly.
I wouldnt go down the expensive route unless youve explored jetting.
Usually a 3 slide and 128 main 45 pilot should be good. (from memory). Is that your setting?
Float level is important too.
IF and big if its head compression then any decent machine shop can skim a bit out?
