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Author Topic: Can a DT1MX race in Pre 70 classic motocross?  (Read 8454 times)

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Offline John Orchard

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Can a DT1MX race in Pre 70 classic motocross?
« on: November 01, 2018, 09:50:21 AM »
l have the chance to acquire a piston-port DT1MX, are they classified as a modded '69 DT1?

l could be open to advice & parts :-)

Thanks in advance. John.
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Johnny O - Tahition_Red factory rider.

Offline sleepy

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Re: Can a DT1MX race in Pre 70 classic motocross?
« Reply #1 on: November 01, 2018, 10:02:05 AM »
Unless there is a rule change in the wind any piston port DT1 or RT1 has been eligible for many years as they are deemed to be follow on models.
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Offline Iain Cameron

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Re: Can a DT1MX race in Pre 70 classic motocross?
« Reply #2 on: November 01, 2018, 05:38:31 PM »
The frame and suspension didn't change as long as its piston port , I cant see a problem . the old rules said square swingarm but that was changed years ago as the RT1 didn't have the square arm . all early DT 's had a DT1 as a pre fix number .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 sleepy

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Re: Can a DT1MX race in Pre 70 classic motocross?
« Reply #3 on: November 01, 2018, 06:41:30 PM »
While on the subject of DT1's, a 360cc DT1(not an RT1) won the pre 70 unlimited class at the Australian titles this year which could be a first.
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Offline Bamford#69

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Re: Can a DT1MX race in Pre 70 classic motocross?
« Reply #4 on: November 01, 2018, 07:29:37 PM »
 Yamaha DT1 pre 70 , DT1MX was a new model and like a DT2mX .is pre 75, not a flow on , and not pre 70,
« Last Edit: November 01, 2018, 07:31:42 PM by Bamford#69 »
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Offline sleepy

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Re: Can a DT1MX race in Pre 70 classic motocross?
« Reply #5 on: November 01, 2018, 07:58:04 PM »
Quote from: Bamford#69 on November 01, 2018, 07:29:37 PM
Yamaha DT1 pre 70 , DT1MX was a new model and like a DT2mX .is pre 75, not a flow on , and not pre 70,

From what I've read on the DT1MX it was a DT1 factory fitted with a GYT kit with lights removed. A DT2MX was a completely different machine to the DT2 Trailer in every way.
Rules just say for follow on models in Pre70 AT1,CT1,DT1&RT1 pre reed block and it certainly falls into that description.
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Offline Bamford#69

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Re: Can a DT1MX race in Pre 70 classic motocross?
« Reply #6 on: November 01, 2018, 08:28:50 PM »
yep you are right the DT1MX is  a different model, therefore not a flow on, can you put a GYT kit on a 1969/70
 DT1?
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Offline John Orchard

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Re: Can a DT1MX race in Pre 70 classic motocross?
« Reply #7 on: November 01, 2018, 09:15:56 PM »
So how does anyone tell the difference between a DT1 and a DT1MX?  Frame or engine number? Where might l find a list to properly identify what l have? Thanks

lf a DT1MX is a DT1 with a power-up kit, a power-up kit that can be purchased for fitting to a DT1 ...... follow-on in my eyes?

l wonder if the MA rule book goes into this?
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Offline Iain Cameron

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Re: Can a DT1MX race in Pre 70 classic motocross?
« Reply #8 on: November 01, 2018, 10:27:49 PM »
The DT1m shared the same frame as the trail bike . Basically it just had the lights taken off and a GYT kit and High front guard done at the factory . Its still a DT1 non reed .
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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 Iain Cameron

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Re: Can a DT1MX race in Pre 70 classic motocross?
« Reply #9 on: November 01, 2018, 10:29:13 PM »
1968 DT1
Pearl White
DT1-00101 to 14090
1969 DT1B
Candy Orange
DT1-15001 to 42520
1969 DT1S
Candy Orange
DT1-90101 to 91573
1970 DT1C
Brilliant Red
DT1-50101 to 66389
1970 DT1CM
Brilliant Red
DT1-95101 to 97218
1971 DT1E
Mandarin Orange
DT1F-00101 to 03492   > (Close ratio transmission)
1971 DT1E
Mandarin Orange
DT1F-20101 to 45120
1971 DT1MX
Mandarin Orange
DT1F-90101 to 93684
1972 DT2
Pearl Yellow
DT1F-105101 to 134257
1972 DT2MX
Silver W/Red
DT1F-185101 to 195339
1973 DT3
Competition Green
DT1F-135101 to 163431+
1973 MX250
Silver Dust W/ Pastel   Yellow
364-000101 to 011040
1974 DT250A
Virginia Gold
450-000101 to 031781
1974 MX250A
Competition Yellow
364-020101 to 028497
1975 DT250B
Portuguese Orange
450-200101 to 224381
1975 MX250B
White W/Portuguese   Orange
509-000101 to 007340
1976 DT250C
New Portuguese Orange
450-500101 to 505102
1977 DT250D
Balboa Blue
1M1-000101 to 009399
1978 DT250E
Crystal Silver
1M1-100101 to 112250
1979 DT250F
Competition Yellow
2N6-000101 to 004320
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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 Iain Cameron

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Re: Can a DT1MX race in Pre 70 classic motocross?
« Reply #10 on: November 01, 2018, 10:30:56 PM »
John did you buy the head and cylinder off Terry from the US .
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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 Slakewell

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Re: Can a DT1MX race in Pre 70 classic motocross?
« Reply #11 on: November 02, 2018, 08:43:58 AM »
Firko is the DT man
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Offline John Orchard

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Re: Can a DT1MX race in Pre 70 classic motocross?
« Reply #12 on: November 02, 2018, 09:41:00 AM »
Quote from: Iain Cameron on November 01, 2018, 10:30:56 PM
John did you buy the head and cylinder off Terry from the US .


Yep l did  :-D
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Johnny O - Tahition_Red factory rider.

Offline John Orchard

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Re: Can a DT1MX race in Pre 70 classic motocross?
« Reply #13 on: November 02, 2018, 09:45:01 AM »
Quote from: Iain Cameron on November 01, 2018, 10:29:13 PM
1968 DT1
Pearl White
DT1-00101 to 14090
1969 DT1B
Candy Orange
DT1-15001 to 42520
1969 DT1S
Candy Orange
DT1-90101 to 91573
1970 DT1C
Brilliant Red
DT1-50101 to 66389
1970 DT1CM
Brilliant Red
DT1-95101 to 97218
1971 DT1E
Mandarin Orange
DT1F-00101 to 03492   > (Close ratio transmission)
1971 DT1E
Mandarin Orange
DT1F-20101 to 45120
1971 DT1MX
Mandarin Orange
DT1F-90101 to 93684
1972 DT2
Pearl Yellow
DT1F-105101 to 134257
1972 DT2MX
Silver W/Red
DT1F-185101 to 195339
1973 DT3
Competition Green
DT1F-135101 to 163431+
1973 MX250
Silver Dust W/ Pastel   Yellow
364-000101 to 011040
1974 DT250A
Virginia Gold
450-000101 to 031781
1974 MX250A
Competition Yellow
364-020101 to 028497
1975 DT250B
Portuguese Orange
450-200101 to 224381
1975 MX250B
White W/Portuguese   Orange
509-000101 to 007340
1976 DT250C
New Portuguese Orange
450-500101 to 505102
1977 DT250D
Balboa Blue
1M1-000101 to 009399
1978 DT250E
Crystal Silver
1M1-100101 to 112250
1979 DT250F
Competition Yellow
2N6-000101 to 004320


Thankyou.
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Offline Bamford#69

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Re: Can a DT1MX race in Pre 70 classic motocross?
« Reply #14 on: November 02, 2018, 11:27:29 AM »
Yes its a pity there is no Official MA site/contact  to get a definitive resolution over eligibility concerns .
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