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Old 01-15-2014, 08:20 AM   #1
Calkins OP
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Question Need Flat Track Advise - RD250 & DT360 - Repost

I posted this in the Old's Cool - 2 Smokers section, but I think I can get more help here.

*** *** *** *** *** *** *** *** ***

The past few years I have been slowly trying to get a flat tracker together. I had a TT500, was ready to race (I think), and had an offer to sell. Recently, I bought back my old pile of spare TT/XT parts, thinking I would going to build another one. But, an old family friend of mine wants to help me put a two smoke together. He was a Yamaha mechanic back in the '70's and '80's, and that is what he would like me to build.

So, this is what I would like to do. There is a "local" series, the Classic Flat Track National Championship Series (http://bikedays.com/id52.html), that has a few half mile races a year. Usually, two are held here in Iowa, Davenport and Knoxville. I want to run the V250/360 class. Back in the day (1973 to 1976) that meant 250cc two stroke twins, 360cc two stroke singles, and 360cc four stroke singles and twins. From what I have seen, the Honda XL350 owns the class. I have not seen many smokers. For me that is great, because I would rather be unique.

So, what I am questing for is technical information. I would like to put together a RD250 and a DT/RT/YZ360 powered Champion. Which engine/year/model, for each, was/is the hot setup? The reason I am wanting to build both, is because I think it will be harder to find a Champion frame for the RD, so the DT will probably get built first as I find RD parts. Then, the DT will probably get switched to a short tracker or TT bike.
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1973 Yamaha RT3 - BECOMING A FLAT TRACKER!
1982 Yamaha XT250 - FOR SALE
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Old 01-15-2014, 09:50 AM   #2
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Quote:
Originally Posted by Calkins View Post
I posted this in the Old's Cool - 2 Smokers section, but I think I can get more help here.

*** *** *** *** *** *** *** *** ***

The past few years I have been slowly trying to get a flat tracker together. I had a TT500, was ready to race (I think), and had an offer to sell. Recently, I bought back my old pile of spare TT/XT parts, thinking I would going to build another one. But, an old family friend of mine wants to help me put a two smoke together. He was a Yamaha mechanic back in the '70's and '80's, and that is what he would like me to build.

So, this is what I would like to do. There is a "local" series, the Classic Flat Track National Championship Series (http://bikedays.com/id52.html), that has a few half mile races a year. Usually, two are held here in Iowa, Davenport and Knoxville. I want to run the V250/360 class. Back in the day (1973 to 1976) that meant 250cc two stroke twins, 360cc two stroke singles, and 360cc four stroke singles and twins. From what I have seen, the Honda XL350 owns the class. I have not seen many smokers. For me that is great, because I would rather be unique.

So, what I am questing for is technical information. I would like to put together a RD250 and a DT/RT/YZ360 powered Champion. Which engine/year/model, for each, was/is the hot setup? The reason I am wanting to build both, is because I think it will be harder to find a Champion frame for the RD, so the DT will probably get built first as I find RD parts. Then, the DT will probably get switched to a short tracker or TT bike.
Back in the 70's the Champion framed Yamaha Twins used the road racer motors like the TD2 and TD3. The RD 250 will be problematic to get any power out of IMHO.
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Old 01-15-2014, 10:20 AM   #3
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Originally Posted by Strong Bad View Post
Back in the 70's the Champion framed Yamaha Twins used the road racer motors like the TD2 and TD3. The RD 250 will be problematic to get any power out of IMHO.
I am not familiar with that engine. The microfiche does not should reeds, is that correct? Are they the same series as the Bonanza and Catalina (I had one of each)? Were the TDs revised, and became the TZ?
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1973 Yamaha RT3 - BECOMING A FLAT TRACKER!
1982 Yamaha XT250 - FOR SALE
2007 Triumph Bonneville America - 865
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Old 01-15-2014, 11:06 AM   #4
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I am not familiar with that engine. The microfiche does not should reeds, is that correct? Are they the same series as the Bonanza and Catalina (I had one of each)? Were the TDs revised, and became the TZ?
No reeds, piston port.

http://en.wikipedia.org/wiki/Yamaha_TD2
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Old 01-17-2014, 06:10 AM   #5
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Need Flat Track Advise - DT360 - Repost

I talked to a guy that has been racing a Yamaha two stroke twin for the past 15 years, I think that is not the way I should go.

So, DT360 tune ups. Any advise?
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1973 Yamaha RT3 - BECOMING A FLAT TRACKER!
1982 Yamaha XT250 - FOR SALE
2007 Triumph Bonneville America - 865
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Old 01-17-2014, 06:48 AM   #6
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That's odd,I used to race shorttrack and halfmiles and quarter miles back in the day,mid 70's into the early 80's till flattrack died here.

On a halfmile the twins always smoked all comers,usually some combination of RD/aircooled roadrace parts Yamahas. Granted a person would have to know how to build and ride a twin but they are FAST.

Randy Mamola (as a kid) used to show up with 3 bikes,a mechanic or two,and his dad. 3 bikes that matched perfectly and done up to a T.
His Yamaha twin was a rocket,as were all of the expert/pro class twins.

Those twins made the neatest sound flying down the straights and lighting it up off the corners,I suppose a 360 single would be simpler,they always sounded like they were on the verge of blowing up trying to hang with the twins on a half mile.
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