Help with numbers, What have I.

[evo550]

I picked you a job lot of bikes and bits from a local wrecker today and need a bit of help with some numbers. So here goes.

DT eng and frame #575
I think a MX frame and engine #364, in silver. was that a '73 or '74
2 other motors one a #450 and a #1R8
Any ideas ?
Thanks.

[mainline]

I think the motors are 74 and 77 dt250

[paul]

 
 

 

YAMAHA MODEL INDENTIFICATION NUMBERS CHART 
1971 MINI ENDURO
JT1 SERIAL # JT1-000101 - 041708
JT1 SERIAL # JT1L-200101 - 201152 W/LIGHTS
1972 MINI ENDURO
JT2 COMPETITION SERIAL # JT1-050101 - 071150
JT2 SERIAL # JT1-300101 - 330000 W/LIGHTS
1974 YZ A
YZ 80 A SERIAL # 462-000101 - 009661
YZ 125 A SERIAL # 453-000101 - 007730
YZ 250 A SERIAL # 431-000101 - 004104
YZ 360 A SERIAL # 432-000101 - 000631
1975 YZ B
YZ 80 B SERIAL # 492-000101 - 018570
YZ 125 B SERIAL # 453-100101 - 101620
YZ 250 B SERIAL # 483-000101 - 002759
YZ 360 B SERIAL # 484-000101 - 001459
1976 YZ C
YZ 100 C SERIAL # 1J4-000101 - 003470
YZ 125 C SERIAL # 537-000101 - 014044
YZ 125 X SERIAL # 1G8-000101 - 007120
YZ 175 C SERIAL # 1L8-000101 - 001610
YZ 250 C SERIAL # 509-100101 - 103405
YZ 400 C SERIAL # 510-100101 - 102838
1977 YZ D
YZ 100 D SERIAL # 1J4-000101 - 103550
YZ 125 D SERIAL # 1W1-000101 - 015610
YZ 250 D SERIAL # 1W3-000101 - 006520
YZ 400 D SERIAL # 1W4-000101 - 006720
1978 YZ E
YZ 100 E SERIAL # 2K5-000101 - 006572
YZ 125 E SERIAL # 2K6-000101 - 015080
YZ 250 E SERIAL # 2K7-000101 - 009850
YZ 400 E SERIAL # 2K8-000101 - 007406
1979 YZ F
YZ 100 F SERIAL # 2W5-000101 - N/A
YZ 125 F SERIAL # 2X3-000101 - N/A
YZ 250 F SERIAL # 2X4-000101 - N/A
YZ 400 F SERIAL # 2X5-000101 - N/A
1980 YZ G
YZ 100 G SERIAL # 3R2-000101 - ON
YZ 125 G SERIAL # 3R3-000101 - ON
YZ 250 G SERIAL # 3R4-000101 - ON
YZ 465 G SERIAL # 3R5-000101 - ON
LT SERIES
LTMX Year: 1973 Start Engine#: LT2-105101
MX SERIES
MX100B Year: 1975 Start Engine#: 427-100101
MX100F Year: 1979 Start Engine#: 3M1-000101
MX100G Year: 1980 Start Engine#: 3T0-000101
MX125 Year: 1973 Start Engine#: AT1-325101
MX125A Year: 1974 Start Engine#: 402-000101
MX125B Year: 1975 Start Engine#: 402-100101
MX125C Year: 1976 Start Engine#: 565-000101
MX175A Year: 1974 Start Engine#: 455-000101
MX175B Year: 1975 Start Engine#: 455-100101
MX175F Year: 1979 Start Engine#: 3M2-000101
MX175G Year: 1980 Start Engine#: 3M2-100101
MX250 Year: 1973 Start Engine#: 364-000101
MX250A Year: 1974 Start Engine#: 364-020101
MX250B Year: 1975 Start Engine#: 509-000101
MX360 Year: 1973 Start Engine#: 365-000101
MX360A Year: 1974 Start Engine#: 365-020101
MX400B Year: 1975 Start Engine#: 510-000101
AT SERIES
AT1 Year: 1969 Start Engine#: AT1-100101
AT1B Year: 1970 Start Engine#: AT1-120101
AT1BMX Year: 1970 Start Engine#: AT1-310101
AT1C Year: 1971 Start Engine#: AT1-139101
AT1M Year: 1969 Start Engine#: AT1-300101
AT1MX Year: 1971 Start Engine#: AT1-313101
AT2 Year: 1972 Start Engine#: AT1-165101
AT2M Year: 1972 Start Engine#: AT1-317101
AT3 Year: 1973 Start Engine#: AT1-200101
CT SERIES
CT1 Year: 1971 Start Engine#: CT1-000101
CT1B Year: 1970 Start Engine#: CT1-010101
CT1C Year: 1971 Start Engine#: CT1-200101/CT1-032101
CT2 Year: 1972 Start Engine#: CT1-065101
CT3 Year: 1973 Start Engine#: CT1-100101
DT SERIES
DT100A Year: 1974 Start Engine#: 437-000101
DT100B Year: 1975 Start Engine#: 437-100101
DT100B5 Year: 1975 Start Engine#: 540-000101
DT100C Year: 1976 Start Engine#: 558-000101
DT100D Year: 1977 Start Engine#: 1T9-000101
DT100E Year: 1978 Start Engine#: 2F5-000101
DT100F Year: 1979 Start Engine#: 2F5-050101
DT100G Year: 1980 Start Engine#: 3A3-000101
DT125A Year: 1974 Start Engine#: 444-000101
DT125B Year: 1975 Start Engine#: 444-100101
DT125C Year: 1976 Start Engine#: 560-000101
DT125E Year: 1978 Start Engine#: 2A6-000101
DT125F Year: 1979 Start Engine#: 2N4-000101
DT125G Year: 1980 Start Engine#: 3J0-000101
DT175A Year: 1974 Start Engine#: 443-000101
DT175B Year: 1975 Start Engine#: 443-100101
DT175C Year: 1976 Start Engine#: 559-000101
DT175D Year: 1977 Start Engine#:
DT175E Year: 1978 Start Engine#: 2A7-000101
DT175F Year: 1979 Start Engine#: 2N5-000101
DT175G Year: 1980 Start Engine#: 3J1-000101
DT1 Year: 1968 Start Engine#: DT1-00101
DT1B Year: 1969 Start Engine#: DT1-15001
DT1C Year: 1970 Start Engine#: DT1-50101
DT1CM Year: 1970 Start Engine#: DT1-95101
DT1E Year: 1971 Start Engine#: DT1F-00101/DTF-020101
DT1MX Year: 1971 Start Engine#: DT1F-090101
DT2 SERIES
DT2 Year: 1972 Start Engine#: DT1F-105101
DT250A Year: 1974 Start Engine#: 450-000101
DT250B Year: 1975 Start Engine#: 450-200101
DT250C Year: 1976 Start Engine#: 450-500101
DT250D Year: 1977 Start Engine#: 1M1-000101
DT250E Year: 1978 Start Engine#: 1M1-100101
DT250F Year: 1979 Start Engine#: 2N6-000101
DT2M Year: 1972 Start Engine#: DT1F-185101
DT3 SERIES
DT3 Year: 1973 Start Engine#: DT1F-135101
DT360A Year: 1974 Start Engine#: 446-000101
DT400C Year: 1976 Start Engine#: 501-200101
DT4 SERIES
DT400D Year: 1977 Start Engine#: 1M2-000101
DT400E Year: 1978 Start Engine#: 1M2-100101

[evo550]

Thanks guys, that helps a bit, except for the 1R8 motor, and the Dt 250 which is complianced as a '76 (c),but it is a #575 number frame and engine not #450. The #450 motor doesn't have a tacho drive the same as the other motors,and has a plate covering the auto lube drive hole, which made me think it was something else other than a DT.

[Nathan S]

Is the plate a neat die-cast thing? I had one on a MX125 motor - in hindsight, it was probably YZ125A (or maybe an option for an MX?).

Haven't seen a 450 motor that isn't DT250A/B/C. Is the head radial finned, or parallel? Radial = B/C.

1R8 = early DT400 monoshock? I had one years ago, and I'm pretty sure it was that prefix. Might have been 1R7 (in which case, 1R8 is probably early DT250 mono)? It was 6/76 compliance, which is very early for a monoshock bike.

[Iain Cameron]

Ir6 is the Euro 1978 dt400 , Ir7 is the Euro 78 250 . page 171 Yamaha dirtbikes by Colin Mackellar . the 364 is a 73 mx 250 (silver for 73 yellow for 74 ) . Is the mx frame for sale?

[GMC]

Fairly certain my 77 DT 400 D was IR9…
Unfortunately the number wasn’t recorded on the receipt

[evo550]

Pics might help, see what I can get sorted tomorrow.
I would appear that the either the 450 or the 1rg motor has an internal rotor ignition ?? Where Dt's ever fitted with these?
The only 1rg part I can find on the net is a IT125 g base gasket.

[GMC]

Strange the things you remember, I just found the Rego papers and it was listed as IR9

And...
The annual fee was $9.40 (Rego Portion)
Plus $65.20 for Insurance

Ahhh, those were the days

[Iain Cameron]

the 450 's were points systems

[evo550]

Ok here we go.

The 450 motor with internal rotor ignition, cases look the same as the other DT motor, just different numbers.


The 1r8 motor, totally different cases, clutch actuating arm on top of cases (not underneath like other motors)



This cylinder is also different to the others,  but doesn't fit the 1r8 cases, is it DT or MX ?




The MX frame... the motor is currently in a DT frame, what's the tank from, fits perfect but has lockable cap ?

[Nathan S]

Ignition is YZ250C or earlier. Maybe MX250B.

Different location of clutch arm = monoshock motor. Can't offer more than that.

Barrel appears to be late twinshock (DT-B/C).

DT-A tank is identical to MX-A, except for tap and cap.

[Iain Cameron]

Swing arm looks like its got some major ribbing welded to it , top mounts moved forward please tell me the old mounts havent been gas axed off . If the frame is for sale Im after it . Iain

[evo550]

Ian,
Didn't see the s/arm bracing till then, the top mounts look like a period mod, but well done. The back half of the original mount is gone but could be easily redone. I think I'll keep the laydown look. Sorry mate MX bits not for sale, but I will be getting rid of the DT and bits, once I get through sorting it all out.