Vintage Dirt Bike Q & A

The AHRMA rule book reads that the cr250m Honda came with more than 4 inches of rear wheel travel. This makes it illegal in the sportsman category. If you use the stock shock what modification is most common to limit the travel to 4 inches. Or if you order works,progressive,or olhins shocks do you just ask for AHRMA legal shocks? Also the way I read the rules an aluminum swing arm like the DG unit I saw in the resources area would be legal.Correct? I am just trying to build a bike that would be legal should I ever make it to an event. Most are a long way from the great white north in Canada! EH!
Wow no replies so far.... must be some vintage racers on here somewhere that know the answer.
Thanks Ken
greenstripe63
(2) cr250m
2002 cr250
1973 z50
1974 cr125m

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Greenstripe63
(2)CR250M
1974 CR125M
1973 Z50
2002 CR250

hi--AHRMA in the past would sell u a hard plastic shim to slip over the shock shaft to bring the travel to the 4in limit. i know this is crazy because the stk shock had 4.1 in travel. this kind of stuff is why i quit the club... u can call ahrma to see if they still offer the shims or make ur own. elsinores rule!!!!

Thanks for the reply Hodaka..... was beginninig to think that no one raced their bikes on here. I understand that the AHRMA is strict so that info is valuable. Looks like the hammer and tongs guys are a little more flexable and a good group to run with as well!
Thanks again
Ken

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Greenstripe63
(2)CR250M
1974 CR125M
1973 Z50
2002 CR250

I run works Performance shocks on all my bikes. On my three 74 CR250M's we had works set the shocks up with a spacer that makes the rear end a little taller to help with the front end rake for better cornering. The shocks are also set for 4" of travel to be in compliance with AHRMA.

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Terry Moody #48f
3x 74 Honda CR250M Elsinore
74 Honda XR75
73 Honda QA50
78 Yamaha YZ125E
78 Yamaha YZ250E
78 Yamaha YZ400E
79 Kawasaki KX250
79 Honda CR250R
79 Suzuki RM400
80 Honda CR125
2x 83 Honda CR480R
98 Kawasaki KX250

Works performance eh.... more great info thanks Terry. Anybody know about whether an aluminum swingarm is legal? Have you had any of the frame failures Terry or is your frame beefed up?
Thanks

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Greenstripe63
(2)CR250M
1974 CR125M
1973 Z50
2002 CR250

All three of the 74's I've built I added gussset's to them prior to painting the frames. No failures yet.

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Terry Moody #48f
3x 74 Honda CR250M Elsinore
74 Honda XR75
73 Honda QA50
78 Yamaha YZ125E
78 Yamaha YZ250E
78 Yamaha YZ400E
79 Kawasaki KX250
79 Honda CR250R
79 Suzuki RM400
80 Honda CR125
2x 83 Honda CR480R
98 Kawasaki KX250

Where did you gusset the frame Terry? In front of and behind the foot peg area? Or somewhere else?

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Greenstripe63
(2)CR250M
1974 CR125M
1973 Z50
2002 CR250