Topic: 1972 Yamaha 250 info/help?
in Forum: General Non-Vette Discussion
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Lifetime MemberModerator
Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
Anybody here know anything about these old turds? I got one...re-discovered it in one of my buildings over the weekend, and am kinda throwing around the idea of maybe trying to get it running. I'm really trying to find out what MODEL it is....I haven't found one on the net yet that was the same. All I know is it is a '72, 250 street bike, and the side panel says "Torque Induction". Anyone got any ideers?
More pics here, if it helps...
http://www.classicgoldwings.com/forum/gallery/album.php?album_id=1721
tia
More pics here, if it helps...
http://www.classicgoldwings.com/forum/gallery/album.php?album_id=1721
tia
Joel Adams
C3VR Lifetime Member #56 
My Link 
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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http://www.scribd.com/doc/10854068/Yamaha-RD250350-19721973-Service-Manual Hope this might help...
|UPDATED|12/17/2012 6:06:23 PM (AZT)|/UPDATED|
|UPDATED|12/17/2012 6:06:23 PM (AZT)|/UPDATED|
corvette440hp
Lifetime MemberModerator
Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
Twin cylinder, oil injection, 2 smoker...just what ya need to give the enviro police the shakes! 
I don't know iffin it's an RD, a DS7, or what. I haven't seen one like it anywhere that I've searched yet. The DS7 seems to be common, but this ain't one of those, best I can tell. The RD is different, too. I'll check Larry's link and see if it helps.
I don't know iffin it's an RD, a DS7, or what. I haven't seen one like it anywhere that I've searched yet. The DS7 seems to be common, but this ain't one of those, best I can tell. The RD is different, too. I'll check Larry's link and see if it helps.
Joel Adams
C3VR Lifetime Member #56
My Link
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
Lifetime MemberEquinunk, PA - USA
Joined: 10/31/2007
Posts: 2468
Vette(s): 1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.
Most likely a RD-250. They used to change them to fire on BOTH cylinders at the same time and run them in Hill Climbs. Called them a "TWINGLE" They had awsome torque at low end for a small bore and the "Rs" will keep up the power band. 2nd gear wide open, dump the cluch, keep your head on the handlebars and point it up hill for a few seconds, trip the light at the top and go back down for another try. 
Restore it, it's worth keepin. Looks great in the picture.
Restore it, it's worth keepin. Looks great in the picture.
Lifetime MemberModerator
Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
Tanks Mark! It do appear to be an RD250, now that I searched that, and found pics that match what I have. The link Larry provides above says that the RD was a 1973 model only, tho...I need to check the dang numbers on the bike....I'm going by the paperwork I have, and it shows it to be a '72. btw, Larry..that manual is great, but I can't d-load it...dadgummit!
I did do a screen cap and at least got the wiring diagram!
Joel Adams
C3VR Lifetime Member #56
My Link
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
Kind of neat to be able to help you..........even a little bit......
corvette440hp
Kind of neat to be able to help you..........even a little bit...... Some how there seams to be a studder with my reply...sorry!
|UPDATED|12/18/2012 1:26:56 PM (AZT)|/UPDATED|
Some how there seams to be a studder with my reply...sorry!|UPDATED|12/18/2012 1:26:56 PM (AZT)|/UPDATED|
corvette440hp
Very cool, I've had a few of these, even the Kawi 2 stroke triple "the triple with the ripple" cuz it handled like sh!t, bust was fast as F>>>!!
|UPDATED|12/18/2012 7:27:11 PM (AZT)|/UPDATED|
the torque injection is just the 2 stroke oil injection for the cylinders..I should be able to tell you anything you need to know on this bike :) great find.. jealous :)
|UPDATED|12/18/2012 7:27:11 PM (AZT)|/UPDATED|
1975 Corvette Coupe
My first Vette.....trying to fix stuff
My Project:
https://docs.google.com/folder/d/0B6uOAIjGf3cWejQ5TjNkcVRybGs/edit
I think this weekend I'll go rummage around "in one of my buildings" and see if I can find a motorcycle in there. Yeah right!
Cool bike, though. I agree, it's a keeper and deserves a resto. I had a '82 Nighthawk 450 for a couple years. Got rid of it 2 or 3 years ago because I was spending too much time and money on it and wanted to get started on the 'Vette resto. (needed room in the garage, too). Now that the 'Vette is at least running (never done) I'm thinking about another Honda. 70's Scrambler 350 is one that I'm kind of interested in.
1976 Silver/Firethorn. L48, 4spd. Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.
in Forum: General Non-Vette Discussion
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