Vintage racing - Chicagoland Sportbikes
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post #1 of 15 (permalink) Old 08-22-2007, 06:02 AM Thread Starter
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Vintage racing

I think I am going to try vintage racing. I need to know any info I can get. I just picked up a 1972 Yamaha DS7 250cc. 2 stroke. I think this will do fine. I do need to learn a lot more about two strokes, as this is my first one. Is there any good forums to learn about this sort of thing?

The pics are not my actual bikes. I am starting with the yellow one and going to try to make somthing like the red/wight one.

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post #2 of 15 (permalink) Old 08-22-2007, 07:22 AM
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Great project!
try
http://www.tz250racing.com/cgi-bin/f...ikonboard.cgi?

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post #3 of 15 (permalink) Old 08-22-2007, 07:25 AM
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That looks like *so* much fun!

I saw a guy on some street fightered version of a '70s bike haulin ass down 355 one day. Scared the crap out of me as he came out of nowhere and split lanes past be with a loud BLLLLAAAAAAAAAAAATTTT and was gone before I could see what it was.

The only details I got was the bike was done up all flat black, had that old frame style and suspension, and I swear it had spikes sticking forward out of straight drag bars.

Sorry...a bit off topic I guess. I've just been interested in a 70's vintage project since that day.

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post #4 of 15 (permalink) Old 08-22-2007, 08:52 AM
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Look up ChiVinMoto, Chicago Vintage Motorcyclists, they've got an e-mail list and there's a couple guys on there who race vintage bikes. They also just did a vintage track day at Autobahn North last weekend.

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post #5 of 15 (permalink) Old 08-22-2007, 02:24 PM Thread Starter
Highspeed ditch inspector
 
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Thanks for the info guys. I am finding it hard to find very much use-able info on the net when it comes to making it run and performance upgrades. I have heard that the DS7 can be tuned to match the RD250 and keep up with TZ250's. Now I just need to learn how.

The DS7 comes with oil injection so you don't have to premix the gas, but I want to get rid of that and use premix. Do I need to make changes/replace the carburetors? Also can I "port" the intake/exhaust? Or will that screw it up? What other mods can I make to a 2stroke to gain power or broaden the power band?

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post #6 of 15 (permalink) Old 08-22-2007, 02:32 PM
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post #7 of 15 (permalink) Old 08-23-2007, 12:04 AM Thread Starter
Highspeed ditch inspector
 
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Quote:
Originally Posted by gettr View Post
Vintage RR is something I think I'd like to try.... got a line on an old rd?????

Good luck... and remember... vintage is all about having fun. Mostly old (FAST) guys having fun on their old bikes.
If you have a chance to get an RD??? and just want to play I say jump on it. They seem to be realy cheap to get running. I bought my nearly running DS7(which is very similar) for fifty bucks. I figure it will cost about two hundred to make it safely rideable(most of that is new tires) and about another seven hundred to get all the body and other track parts. $1000 isn't to bad to be race ready.

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post #8 of 15 (permalink) Old 08-23-2007, 12:34 AM
i need a new bike, this one is trashed
 
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I have an RD which I am struggling to get the electricals working right. My plan is to try and do some kind of vintage racing on it once it is done.
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post #9 of 15 (permalink) Old 08-23-2007, 12:54 AM Thread Starter
Highspeed ditch inspector
 
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I still need to do some research but I am going to direct wire the engine and eliminate the wire harness. My harness has been eaten by mice.

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!!!!!!!( y )!!!!!!!!!!!!!!!!

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post #10 of 15 (permalink) Old 08-23-2007, 07:02 PM
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post #11 of 15 (permalink) Old 08-23-2007, 07:36 PM Thread Starter
Highspeed ditch inspector
 
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Quote:
Originally Posted by gettr View Post
1000 to be race ready.... that's ok! Eliminate the harness? Gonna go to a total loss set-up? Good luck..... and have fun. If (yeah right....when....lol) I find an old RR bike that feels good, I'll see you out there.
I don't need to go total loss to eliminate the harness. I will point to point wire the stator to the rectifier, back to the points, then to the coils. I would like to eliminate the batery if possible. I think I can do this, more research will tell me if I can. I want to eliminate anything possible to get the weight down, cause other than a few brackets, I can't lose much from the frame.

I did find a link to a shop that can do a full race motor for about $1500. That would put you in the front of the pack at any vintage race. I wont be going that route yet, but maybe in the future.

AHRMA does have some good links.

I love it when a plan comes together.

!!!!!!!(.)(.)!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!). (!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!( y )!!!!!!!!!!!!!!!!

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post #12 of 15 (permalink) Old 08-23-2007, 07:49 PM
i need a new bike, this one is trashed
 
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Quote:
Originally Posted by sqrly View Post
I don't need to go total loss to eliminate the harness. I will point to point wire the stator to the rectifier, back to the points, then to the coils. I would like to eliminate the batery if possible. I think I can do this, more research will tell me if I can. I want to eliminate anything possible to get the weight down, cause other than a few brackets, I can't lose much from the frame.

I did find a link to a shop that can do a full race motor for about $1500. That would put you in the front of the pack at any vintage race. I wont be going that route yet, but maybe in the future.

AHRMA does have some good links.

I love it when a plan comes together.
let me know how that electrical plan works out i might end up doing something like that.
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post #13 of 15 (permalink) Old 08-23-2007, 07:59 PM Thread Starter
Highspeed ditch inspector
 
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Quote:
Originally Posted by ashwingop View Post
let me know how that electrical plan works out i might end up doing something like that.
Will do.

It apears that there is 4 wires for the points, 3 for the stator, and 1 that I dont know where it goes. (I am still waiting for the wire diagram) I should know more when the manual that I ordered comes in.

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!!!!!!!!). (!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!( y )!!!!!!!!!!!!!!!!

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post #14 of 15 (permalink) Old 08-23-2007, 09:09 PM Thread Starter
Highspeed ditch inspector
 
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Ok, this is the best place I have found for old yamaha 2-strokes.
http://www.lawrenceotoole.com/r5/r5cycle.html

Look on the right hand of the page for "technical stuff" and links. They have the DS7, R5C, RD250, RD350, factory repair manual on pdf.

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post #15 of 15 (permalink) Old 09-03-2007, 03:59 AM
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A decent running Yamaha TD2 will make about 50HP. That's probably doable, with some money, to your bike.

The advantage that the street frame has is that it is more durable. The GP Yamaha chassis are light, and they fracture.

Yeah, you can eliminate the injector lube. Yamaha used to have a block off plate for the injector pump. On the carbs, you can just cap the little ends and you'll be good with that part of it.

Two stroke engines are unique. Do you have chambers yet? Those are going to cost some good money. The chambers are very important, and they are important to have them so that they don't drag too bad. Yeah, you can port it and all, but, again, a two stroke is unique. Usually there are power gains from changing the port timing. As an example, you can use two base gaskets that raise the ports, then cut that same amount off the top of the cylinder and get a very nice gain. But you'll really want to research that stuff up front to find a combination that works with the carbs and pipes you've got.

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