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Author Topic: Why is a RT1 pre70  (Read 863 times)

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lucien

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Why is a RT1 pre70
« on: December 31, 2012, 05:47:52 pm »
my RT 1 is 1971 , the first one , but is it pre 70 to race in.
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Offline Iain Cameron

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Re: Why is a RT1 pre70
« Reply #1 on: December 31, 2012, 06:01:09 pm »
Yes the RT is classed as a follow on model so pre 70 is the go . Iain
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Yamaha tragic ; dt1, rt1, dt2, rt2, dt2mx , rt2mx , mx250, mx360,sc500, 74dt125, yzx125, yzc250, yzc400, yzd250, yzd400, yzh250, yzh80 , dt100 , xr75 ko xr80 03 , it175 82 . Not a member of any club

Offline Nathan S

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Re: Why is a RT1 pre70
« Reply #2 on: December 31, 2012, 06:05:15 pm »
The basic idea is that while they weren't available in 1969, all of the technology is pre-70 (and significantly outclassed for pre-75) so they belong in pre-70.

I think it's a good call - they boost the numbers in the pre-75 263cc+ class, without damaging the spirit of the era. If anyone ever managed/manages to win the class on an RT1, then they bloody well deserve it!
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Offline Freakshow

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Re: Why is a RT1 pre70
« Reply #3 on: December 31, 2012, 06:21:44 pm »
And your rt1 needs to be piston port as well....
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Offline firko

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Re: Why is a RT1 pre70
« Reply #4 on: December 31, 2012, 06:27:19 pm »
Quote
my RT 1 is 1971 , the first one , but is it pre 70 to race in
The first black tank/yellow pinstripe RT1 was released in May 1970.
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'68 Yamaha DT1 enduro, '69 Yamaha 'DT1 from Hell' '69 DT1'Dunger from Hell, '69 Cheney Yamaha 360, 70 Maico 350 (2 off), '68 Hindall Ducati 250, Hindall RT2MX, Hindall YZ250a , Cycle Factory RT2MX flat tracker, Yamaha 1T250J, Maico 250 trials, '71, Boyd and Stellings TM400, Shell OW72,750 Yamaha

Offline vandy010

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Re: Why is a RT1 pre70
« Reply #5 on: December 31, 2012, 07:34:47 pm »
what they said^^^
no reed block, just carby straight into the barrel and she's good to go ;)
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Offline Iain Cameron

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Re: Why is a RT1 pre70
« Reply #6 on: December 31, 2012, 08:48:39 pm »
Lucien the guys posting above plus a couple of others on here are  the DT/RT gurus between them there is a mine of info for you to tap into if your going to race a pre 70 Yamaha .  ;D
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Yamaha tragic ; dt1, rt1, dt2, rt2, dt2mx , rt2mx , mx250, mx360,sc500, 74dt125, yzx125, yzc250, yzc400, yzd250, yzd400, yzh250, yzh80 , dt100 , xr75 ko xr80 03 , it175 82 . Not a member of any club
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