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Author Topic: RT1-360  (Read 13412 times)

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Offline Nathan S

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Re: RT1-360
« Reply #15 on: May 24, 2010, 09:52:13 PM »
Quote from: mx250 on May 24, 2010, 09:22:19 PM
Quote from: Freakshow on May 24, 2010, 09:06:08 PM
....... and its ealry so im not sure when the tanks changed and became Dt360a
with the new lowered frame ;). All DT250/360 and MX250/360 tanks are held on by a welded on bolt on the frame at rear, with large washer and rubber isolation. DT/RT have a dickie little rubber band with canvas tag for stretching into place over a hook on the tank (worth a small fortune NOS ;D).

Yes.

The tanks changed because the frames changed. The DT1/RT1 has a single backbone until just above the carb-airbox boot, while the DT250/360 back-bone ends under the seat/tank junction. This change makes room for the exhaust pipe to cross over the top of the motor, and travel along under the tank/seat within the frame.
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Offline VMX60

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Re: RT1-360
« Reply #16 on: May 24, 2010, 10:36:17 PM »
True Story
First RT1mx over here in the West straight from the crate to 1st MX meeting as a promo New world beater 21 in front wheel black tank ;D
Large crowd gathered
The 3rd kick spat the kickstarter idle gear complete with shaft end up though the top crankcase.
As the Yamaha salesman Guess who was kicking the bloody thing
Never sold a single true RTMX after that ::)
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firko

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Re: RT1-360
« Reply #17 on: May 24, 2010, 10:47:58 PM »
Quote
To the best of my knowledge they all had frame numbers starting RT1 - confusing eh!
I was led to believe they all started with RT1 as well so I went out to the mancave and checked all of my RT1/2/3 engines (6 of 'em and I was right, they all start with RT1. The engine I've built for my Cheney only has RT1 and no numbers. I'm assuming that they must have been a replacement set of cases. Any other ideas for the lack of an engine number?
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Offline Freakshow

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Re: RT1-360
« Reply #18 on: May 24, 2010, 11:09:38 PM »
CAnt find my Rt list, but the Following DT250 numbers were the reserved start numnbers for the following series :

Dt1         (68)   DT1-00101#
Dt1B       (69)   DT1-15001#
Dt1C       (70)   DT1-50101#
Dt1CM    (70)   DT1-95101#
Dt1E       (71)   DT1F-00101 /  DTF-020101#
Dt1MX    (71)    DT1F-090101#
Dt2        (72)    DT1F-105101#
DT3        (73)   DT1F-135101 #
Dt2MX    (72)   DT1F-185101#
DT250A  (74)   450-000101 #
DT250B  (75)   450-200101 #
DT250C  (76)   450-500101# was the case up

Also its my understanding is numbers under 101 were held back in the factory for testing, sponsorships, teams etc etc and that was the case until at least 1980 ( G series)
« Last Edit: May 24, 2010, 11:17:35 PM by Freakshow »
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74 Yamaha YZ's - 75 Yamaha YZ's
74 Yamaha  flattracker's
70  Jawa 2 valve speedway's

For sale -  PRE 75 Yamaha MX stuff, frame, motors and parts also some YAM DT1,2,A and Suzi TS bikes and stuff

Offline Freakshow

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Re: RT1-360
« Reply #19 on: May 24, 2010, 11:23:11 PM »
Not sure firko but as there are no ribs under the letters, they can be ground,  but if its clean flat metal then its how it was.  I though Most ealry case replacements where blank, but im assuming cause they looked so similar to the DT except the stud spaces,  maybe the prefixing was to insure they werent mixed up in the spares shops and wrongly sold with the 275 cross overs on the 214 motors
« Last Edit: May 24, 2010, 11:25:18 PM by Freakshow »
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74 Yamaha YZ's - 75 Yamaha YZ's
74 Yamaha  flattracker's
70  Jawa 2 valve speedway's

For sale -  PRE 75 Yamaha MX stuff, frame, motors and parts also some YAM DT1,2,A and Suzi TS bikes and stuff

Blowkat

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Re: RT1-360
« Reply #20 on: May 25, 2010, 10:42:03 PM »
1973 RT3  360 1 Baja Brown RT1-125101--150994 RT1-125101--150994

Well bugger me i have opened a can of worms here ,So i went looking today and found a web site with all the yamaha serial numbers.
All i did was google yamaha rt1 360 serial numbers , And the numbers above are what i came up with.
So now i have a bike for sale which is an rt3-360 which is up for grabs with the best offer.
I hope this web site clears up a few queries for everyone on their own projects.
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Offline pancho

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Re: RT1-360
« Reply #21 on: May 27, 2010, 12:10:44 PM »
I just put a short story on here but my computer turned itself off when i tried to post it so here's the basics -My RT1 had YELLOW stripes under house  paint on the original tool box, gear selector shaft comes out both sides, has not got reed valves. Every one said it should have red stripes hence my interest in the previous posts.cheers wally. [The tank had house paint also.]
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mx250

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Re: RT1-360
« Reply #22 on: May 27, 2010, 12:15:46 PM »
Quote from: wally cox on May 27, 2010, 12:10:44 PM
gear selector shaft comes out both sides,
It's one of the earliest ;). I'm not sure of when they dropped the ' gear selector shaft comes out both sides' feature, it may have been mid-way through the first model (same with the change in strip colour).
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firko

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Re: RT1-360
« Reply #23 on: May 27, 2010, 12:23:39 PM »
Quote
just put a short story on here but my computer turned itself off when i tried to post it so here's the basics -My RT1 had YELLOW stripes under house  paint on the original tool box, gear selector shaft comes out both sides, has not got reed valves. Every one said it should have red stripes hence my interest in the previous posts.cheers wally. [The tank had house paint also.
Wal...my original RT1MX had a yellow stripe. The first 1970 production run had a yellow pinstripe but when the second run emerged they had a red stripe. I'm pretty sure the yellow stripe production run was pretty short as my mate had a red stripe RT1 at the same time I had mine and I remember that the engine numbers were within a 1000 of each other.
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Offline jerry

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Re: RT1-360
« Reply #24 on: May 27, 2010, 01:11:08 PM »
RT1 and 2 had 19" front wheel. RT3 had 21" from memory. Jerry
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Offline JC

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Re: RT1-360
« Reply #25 on: May 27, 2010, 01:16:30 PM »
Thats what I tho't Jerry but the RT3 pictured on pg1 looks like 19" to me
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Offline jerry

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Re: RT1-360
« Reply #26 on: May 27, 2010, 01:26:29 PM »
Could be. Hard to say. My old man had a brand new RT2. I only found out it had a 19" when I tried to fit a 21" tyre. DOH! Jerry
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Offline Tim754

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Re: RT1-360
« Reply #27 on: May 28, 2010, 03:01:12 PM »
21inch steel rim on RT3, 19 on all the others OK. Info from genuine Yamaha Aust spec brochures . SFA else different except paint and  yes the RT3 still  could regularly kickback like a fooken rapid mule.
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Offline Billet YZ

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Re: RT1-360
« Reply #28 on: January 15, 2011, 03:35:01 PM »
G`day all,
              just a quick question regarding these bikes as i`m no expert on what could be done to them performance wise.

I came across a couple of old bikes sitting in a workshop today while dropping off a car there, the Yamaha i was looking at started with the RT1 pre-fix on the frame though i didn`t take any notice of the frame numbers.
The guy i was speaking with said his brother used to do some desert type races on it and it was modified to be a 500cc, was this a performance kit available back in the day or simply a one off by somebody ?

Apparently the parts are all there to put the thing back together except for the piston which needs to be modified to suit, the previous piston destroyed itself hence the reason for the bike being in pieces.

It has the single tube pro taper type bars on it complete with the old style hexagonal shape blue grips, the front guard has the extra piece screwed to it to make the guard longer. Any ideas ?. Peter.
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firko

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Re: RT1-360
« Reply #29 on: January 15, 2011, 03:51:26 PM »
That ''500cc'' kit sounds like a bit of a stretch but it may have a GYT race kit in it. If it does indeed have a 500 kit it's most certainly a home made deal. The RT1 is quite legal for pre '70 class and can be made competitive with a wee bit of work. The handlebars sound like solid alloy Inter-Ams which were popular in the day, as were those awful Hex-Grips.
What colour was the tank? Is it for sale? How much? Have you got any photos?
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