Vandy,
I finally got the MX100b out on the track at the AHRMA Tulare National. It sucked a crank oil seal and I was crop-dusting all around the track, but what a load of fun!!!! You guys need to get this thing going down-under.
Look at the end of this video and you can see it looks like he is catching up to burning smudge-pot or wild fire. LOL
http://media.putfile.com/AHRMA-Tulare-Sportsman-125-MXHere are the AHRMA rules for the MX100 class:
11.1.4 100cc MOTOCROSS: 88-100cc two-stroke and 88-120cc four-stroke production motorcycles
manufactured as up to 1974-model-year machines, and like-design. All motorcycles
in this class must have been manufactured 100cc or smaller-displacement bikes.
Eligible machines include:
Bridgestone
Bultaco Lobito or Sherpa S
DKW
Hodaka 90 or 100
Honda CT90 or CB/CL/SL/XL100
Indian
Kawasaki 90 or 100
Moto Beta
Penton
Rickman-Hodaka
Sachs
Suzuki TC/TS90 or TS/TM100
Van Tech frames with any eligible engine
Yamaha YL1E, HT1, LT2 or DT/MX100
Zundapp
a) Engine displacement can be increased to class limit, plus allowable overbore.
b) Engines must have no more than five gearbox ratios.
c) Electronic ignitions and reed-valves are allowed.
d) Maximum carburetor size is 28mm.
e) Aftermarket frames are limited to those listed, pending approval of the Rules &
Eligibility Committee.
f) Engine/frame combinations must be as manufactured; no mixing-and-matching of
engines and chassis into "specials."
g) Honda four-strokes are limited to the one-piece cylinder head. No major engine
components from 125cc engines are allowed.
Ineligible 100cc Motocross machines are:Any machine or major component manufactured as/for a 125cc motorcycle.
Six-speed gearboxes of any type.
Rickman frames originally manufactured for Zundapp engines.
Monarch frames.
I hope this helps!