Following is a short summary of rules and modifications allowed to the TL125 under the rules of AHRMA modern classics -class. My sincere thanks to the expert help of Bob Ginder of B&J Racing. Bob is one of AHRMA National trials coordinators and has clarified some issues to me. Note: Comments below are my understanding of the rules and their interpretation. If you plan to compete in AHRMA I would contact them prior to any major modifications.

12.1.5 MODERN CLASSIC: Any unit-construction machine up to and including model year 1979. Examples: Bultaco 5-speed 125-350, Suzuki RL250 & TS models, Beamish Suzuki, Montesa Cota 123-348, Ossa 250-350 MAR & BLT, Yamaha TY175-250 & AT/CT/DT models, Kawasaki KT250 & enduro models, Honda TL125-250 & SL/XL models, GRM Maverick rigid frames with four-stroke engines. TMI framed Hondas and Frazier frames are eligible. Modifications and major components limited to those of the era, typical of machines of the mid-’70s.

12.2 TECHNICAL INSPECTION AND MODIFICATIONS

12.2.1 TIRES AND WHEELS: Trials tires are required in all classes. Motocross knobby-type tires may be used in the Beginner class at the discretion of the promoter. Any pre-1975 hubs and any type of rim from the proper era for that machine are acceptable. Only the Modern Classic class may use pre-1980 components.

12.2.2 SUSPENSION: No single-shock machines may compete, except Vincent. Suspension travel is limited to 4 inches in the rear and 7 inches in the front. Rear dampers may be replaced with any units using technology available to December 31, 1974. Ossa Bolger Long Travel (BLT) machines may compete in Modern Classic, with rear wheel travel limited to 4 inches.

12.2.3 NOISE: Silencers are required; no machine may compete with an open exhaust system.

12.2.4 No major components may be later than 1974 (specifically, engine, frame, gearbox and forks). Only Modern Classic may use components later than 1974 (but limited to pre-1980).

12.2.5 All motorcycles must comply with all applicable AHRMA and AMA competition and safety rules, including rule 9.7.11 (fuel) and 9.7.17 (AHRMA decals; two required and may be placed on any readily visible part of the motorcycle).

12.2.6 ALL MODIFICATIONS MUST BE CONSISTENT WITH THE SPIRIT OF THE CLASS. Period modifications have been extensively documented and machines with obvious non-period or excessive modifications will be disqualified or required to compete in the next-higher-level class.

• Frame Mid-70's vintage after market frames are OK.

• Forks Swapping forks from another mid-70's vintage bike is OK.

• Shocks After market shocks are OK, notice the limitation on the suspension travel. Rear dampers may be replaced with any units using technology available to December 31, 1974. Illegal shocks include: Any shock with a separate remote reservoir (i.e., connected by a hose) and any post-1974 technology, such as Fox air shocks, etc.

• Engine Quite extensive engine modifications are allowed, including stroker kits, re-sleeving, using other Honda cylinders etc. Exhaust may be changed, but must have a muffler.

• Carburetor Swapping from other old bikes is OK although the TL carb works good. Pumper carbs and carburetors with accelerator pumps are not allowed. Only round slide carbs are legal.