Author Topic: NEED HELP ON 3 YAMAHA MOTORS  (Read 1890 times)

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Offline jimg1au

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NEED HELP ON 3 YAMAHA MOTORS
« on: August 20, 2007, 03:47:16 PM »
hi
i have just recived 3 yamaha motors
450-228728 in peices
3j5-00608   in peices
dt1f-123327 complete
can any one tell me what they are
cheers
jimg

Offline Freakshow

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Re: NEED HELP ON 3 YAMAHA MOTORS
« Reply #1 on: August 20, 2007, 04:44:52 PM »
450 is a 1975 - DT250 if you dont need it get onto freaky he has a use for them.

3J5 ?  is that  a yamaha orare you misreading it ? unless its a late model DT or one of them 79 DT 400 F plonkers
Dt1F is from a DT2 1972 series
« Last Edit: August 20, 2007, 07:20:28 PM by Freakshow »
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 jimg1au

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Re: NEED HELP ON 3 YAMAHA MOTORS
« Reply #2 on: August 20, 2007, 06:33:39 PM »
hi
it could be 305
the barrel has a place for decompresion lifter i think it might be 400cc
cheers
jimg

Offline Nathan S

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Re: NEED HELP ON 3 YAMAHA MOTORS
« Reply #3 on: August 20, 2007, 06:58:42 PM »
450 prefix can also be '74 DT250 (and maybe twin shock '76?). The actual serial number tells you which year, but I can't remember what the change-over number is.
Other way to tell is the cylinder head - '74 has parallel fins, '75 has radial fins.

Speed and Sport shows no matches for 3J5 or 3O5.
305 prefix is LT2, which you wouldn't mistake for a 400cc engine!

Most barrels will have the capacity cast into them, which would help.

Pics?
The good thing about telling the truth is that you don't have to remember what you said.

Offline Freakshow

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Re: NEED HELP ON 3 YAMAHA MOTORS
« Reply #4 on: August 20, 2007, 07:09:55 PM »
450 prefix can also be '74 DT250 (and maybe twin shock '76?). The actual serial number tells you which year, 

1974 cut off is prior to the 20000 numbers so its late 75 build

:DT250B Year: 1975 Start Engine#: 450-200101 +
« Last Edit: August 20, 2007, 07:17:13 PM by Freakshow »
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: NEED HELP ON 3 YAMAHA MOTORS
« Reply #5 on: August 20, 2007, 07:21:24 PM »
ok IF IT HAS A DECOMP SPOT IT WILL BE A  ::: DT 400 F 79 = 3J5  ::
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