Gearing Help

[cardinalhvac]

We run TT here in the Midwest and run a Drx 90 Air cooled with ported cylinder and 28mm Koso carb/ Koso old style pipe. We are running American Racer 16/8.5/8 back tires. Right now we are running stock sprockets 28 rear and ???? front. Any suggestions on gearing for outdoor tt racing. We really don't want to switch to the gocart axle and tires but still wan't to be there at the finish.
Any help would be appreciated.

[Reimer Racing]

Not sure what gears are in your tranny. On Zacks 90 with the 9 to 1 gears, and 15" American Racers I run 21/28. On tracks with long straight aways I run 21/26. Hope this helps.

[cardinalhvac]

I don't even know where you can get front sprocket that large 15-18 is all i ever see

[sldhd700]

Call Hot Quads