jetting an 08 90 l/c

[RapKor]

Have an 08 DRR 90 l/c. Motor has been ported and polished,has stock pipe,24 keihin carb with two stage Uni filter, been running a 120 main just re did top end (piston and rings) now running super lean. Checked the head gasket and base gasket (starting fluid method) and they appear to be fine. Any ideas where to start with the jetting? Appreciate any help I can get. Thanks

[mudder700]

go rich and lean up from there,that way you won't blow it up, I have a 138 in mine

[riding4fun]

I have a similar set up with a 130 main and I think a 53 or 55 pilot.

[ToddL]

hmmm - our 70 runs the same carb and we
are at a 135 main with a 48 pilot most of the time.
you're just way too lean I think.
I'd start out with a 140 or 145 main at least and
see if it bogs. like the man said, richer is better, then
lean out as needed.