RT1 V RT2 V MX360

[Quicksilver]

 

[Mick22]

Hey fellas, I picked up the old beast today its rough but Its good enough to make a race bike out of. Un fortunately its not a piston port so won't be able to use it in pre 70.

Its got a reed block and it looks like some sort of decomp on the front of the barrel connected to a lever on the left handle bar??? the Eng # is RT1-135947. So would this be the orig barrel or has someone fitted a later model top end to an early motor?? Any idea what year it would be

I've had a good look around on the internet but can't find much info on the 360's, like I said earlier I don't know a lot about old yammies so still working it all out. from what I've figured out-

RT/DT is the enduro model, I thought MX was the motocross model but it seems they made MX and YZ at the same time and I'm sure the YZ is a motocross model..... so I'm confused can anyone shed any light on this

Cheers

Mick

[Freakshow]

RoAd/ trail, -  enduro/track,  -  track/ competition

or you could say the mx was the WR to the YZ.

Although the flat track guys loved the RT/DT and the MX cause they had better roll on power over a wider band.  it depends what you are gong to use it for i guess as to how good it will sui that use.  Just enjoy regardless, you own somones history 

[mx250]

arn't I kind to ya .



http://cgi.ebay.com/ebaymotors/YAMAHA-DT1-RT1-MX-250-360-FRAME-LOWERING-KIT-FLAT-TRACK_W0QQitemZ140222621522QQcmdZViewItem?hash=item140222621522

Either bid or use the  picie to make your own. 

[mx250]

... but it seems they made MX and YZ at the same time and I'm sure the YZ is a motocross model..... so I'm confused can anyone shed any light on this

Initially MX and YZ were both MX models with the MX been 'softer' and cheaper and aimed at the masses. The YZ was a much sharper weapon, more expensive, and aimed at the professional rider (Yamaha Dealer sponored been typical). That changed after '75 (?) when all MX'er got the YZ tag. 

[vandy010]

Mick,
all the RT models run the RT1-prefix, so my guess is you've got either the RT2 or 3
which is the exact same machine apart from the reed block. build it up and keep your eyes open for a non-reed barrel as you go. they are rare but do exist. i got mine from ebay in the states for US$35
do your ebay searches as yamaha RT, and then check the US ebay, pistons are pretty cheap, engine seals are easy to get as are bearings, most everything else needed for moto-x is a pretty close relative to all the early yammies, so anything Dt,mx,yz can bolt over.
any hassles, give us a yell.
good luck with it.

[jimson]

MX250 how do the spacers work there is only three and the frame has four down tubes  jimson

[mx250]

MX250 how do the spacers work there is only three and the frame has four down tubes  jimson

Good question  . If you are interested ask the seller. May be the other is 'not in frame'  .

[firko]

The two smaller diameter tubes go into the front down tubes just above the engine mounts and the larger dia tube goes into the single rear downtube above the rear engine mount.

[jimson]

Firko what happens to the two smaller tubes coming down from the back supporting the rear of the frame or have I got it wrong  jimson

[mx250]

Hey fellas, I picked up the old beast today its rough but Its good enough to make a race bike out of. Un fortunately its not a piston port so won't be able to use it in pre 70.

Its got a reed block and it looks like some sort of decomp on the front of the barrel connected to a lever on the left handle bar??? the Eng # is RT1-135947. So would this be the orig barrel or has someone fitted a later model top end to an early motor?? Any idea what year it would be

I've had a good look around on the internet but can't find much info on the 360's, like I said earlier I don't know a lot about old yammies so still working it all out. from what I've figured out-

RT/DT is the enduro model, I thought MX was the motocross model but it seems they made MX and YZ at the same time and I'm sure the YZ is a motocross model..... so I'm confused can anyone shed any light on this

Cheers

Mick

Here's your Pre72 barrel...

http://cgi.ebay.com/ebaymotors/1971-Yamaha-RT1-RT-1-360-Cylinder_W0QQitemZ320238209042QQcmdZViewItem

[Mick22]

Spewing!! missed out on the barrell.... didn't see your post until too late thanks anyway. Hey Vandy are you going to use it or resell it??

[Freakshow]

Vandy i reckon i have a piston for that overbore

[vandy010]

freaky, i'll wait till it gets here and measure it up before i decide what size i need. thanks anyway.
Mick, PM on the way!

[Mick22]

I think I got the barrel I need 

Is this the right one, I was reasonably sure when I bid on it but looking at it now I realised it doen't have the decomp..... anyone know what its off??

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&ih=016&sspagename=STRK%3AMEWN%3AIT&viewitem=&item=260229672130&rd=1

Got another question for the Yammie experts, I've got a couple of LT2 100's that I'm going to make into classic bucket racers, one of them I want to cut all the excess brackets off the frame, before I bastardise them I want to make sure that by some chance they have become collectable??

Cheers

Mick