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Old 08-04-2013, 08:41 PM   #1
srrhoades OP
"No, just Blah,blah."
 
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Joined: Sep 2008
Location: Beautiful Iowa, stop snickering!
Oddometer: 8
Where does my '74 DT belong?

I finally have my DT 250 ready to race in AHRMA, but I'm unsure of which class it fits. Historic 250 lists '75 to '77 as eligable so I figure they would give the nod to my '74. Any thoughts? Also are modern Progressive shocks legal or does that violate the spirit of old and crunchy?
Thanks for any help, can't wait for that first event.
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Old 08-04-2013, 09:34 PM   #2
Scootern29
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Progressives will last a couple of races and then you will have to get another set of something.
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Old 08-04-2013, 09:58 PM   #3
srrhoades OP
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Wow, for what they charge I would expect great quality. Thanks for possibly saving me some serious and expensive frustration.
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Old 08-05-2013, 04:17 AM   #4
stainlesscycle
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cross country or mx? 74 dt250 runs in sportsman 250, or in an age class. it is also legal for the pv classes (i.e. historic) - i would assume since you're in iowa you're running mx (there's no cc nationals west of illinois, and most are on the east coast)

progressive shocks are fine, but are not rebuildable - they can last a long time, or go kaput fast. luck of the draw. if you can keep the shafts clean, they will last longer... if you're racing it, get any shock that is rebuildable, so at least you don't have to replace everytime it stops working. any modern shock with 4" travel or less that does not have remote reservoir/piggyback is legal in vintage. many run works, ohlins, etc...remote reservoir (with hose) is legal in historic - you're probably not gonna want to run a 74 dt250 in historic - you'd be running against bikes with almost double the travel.. if you're running in vintage, get as close to 7" front and 4" rear as you can - even an inch makes a helluva difference.. for vintage i kinda like the redwing hammerheads - they work, and are not super expensive, and are rebuildable - and they look period correct - there are better shocks available though... the cheapest rebuildable shocks to run from that era are the thermaflows ...if you can find a set of redwing 340's they work well for 74 yamaha.. i have not seen a nos set of hammerhead 340's in a while - everyone has 330's...

as for progressives quality - it's not bad - but they're all valved the same, and are all basically identical inside (street and dirt)... if you think progressive shocks are expensive you'd be amazed at what many are spending on rear shocks :)
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stainlesscycle screwed with this post 08-05-2013 at 04:32 AM
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Old 08-05-2013, 07:26 AM   #5
srrhoades OP
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Thanks a ton for all the great info Stainless!
My plan is to run both MX and crosscountry. Top of my list is Road America, I was there last year and it looked like too much fun too miss out on. At least that year they had both races, and what I walked of the CC loop looked sweet. My only competition experience is in modern trials and I have an old TY, but vintage trials didn't look like as much fun.
Thanks again.
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Old 08-05-2013, 07:49 AM   #6
stainlesscycle
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for cc it runs in either sportsman open or an age class (if you're 50+), you could also run it in pv race in age or historic open
for mx it runs in sportsman 250, and age class (if you're 40+), and/or open age, it can run in pv mx in historic 250, open age, and/or an age class.

dt250 would be most competitive in the sportsman classes.. here's what you will be running against mostly: bultaco, can-am, cz, yz, cr, huusky, maico, ossa, etc. - very few start with enduro/trail bikes, but it can and has been done very succesfully... the key for your first race is to make the bike as reliable as humanly possible, and have fun. there are a helluva lot mechanics racing, so know everything you can possibly know about your bike...


if i was running a dt250, i'd figure out how to get at least 30+ lbs off of it...fix the suspension, get rid of injector, put a real pipe and ignition on it, aluminum rims, etc. harder to start with the dt's, as the mx/yz's are already much closer to race ready... but it's vintage racing, so the most important thing is to enjoy it... the advantage you have with a dt is you start with a dead reliable motor, with a good transmission, decent power delivery, and a sturdy frame... the disadvantages are hp and weight...
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stainlesscycle screwed with this post 08-05-2013 at 07:57 AM
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Old 08-05-2013, 06:06 PM   #7
srrhoades OP
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Thanks again for the great info Stainless. I've already removed over thirty pounds of unnecessaries. Power reeds are in and unifilter installed, and she seems to be making really good power. This winter a friend who built drag engines is going to teach me how to port and balance and all his other little "tricks".
As far as other upgrades, I'm going to wait. Stick my toe in and concentrate on having a good time. If I'm outclassed so be it, I've been DFL in trials and it didn't destroy my ego. Aluminum rims would be nice, unsprung weight and rotational as well, but I'm shy of 140 pounds and have strength like a bug, so I've got that going for me. My favorite trials events were ones with long loops so ya had to haul ass on the third to make time. In other words, standing and dealing with not a lot of travel is not foreign to me.
Thanks again you've been a huge help!
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Old 08-26-2013, 01:27 PM   #8
stainlesscycle
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Quote:
Originally Posted by stainlesscycle View Post
progressive shocks are fine, but are not rebuildable - they can last a long time, or go kaput fast. luck of the draw.
dang. i am rescinding my comment about progressive shocks being 'fine'. just blew out a progressive shock on a backup bike that has 4 total motos on it. junk.

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stainlesscycle screwed with this post 08-26-2013 at 01:40 PM
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