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yamaha 1975 dt400b

This is a discussion on yamaha 1975 dt400b within the Motorcycle Discussion forums, part of the General category; I am rebuilding a 1975 Yamaha dt400 and am looking for the place where the hose from the oil pump ...


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Old 06-13-2011   #1
lha
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Default yamaha 1975 dt400b

I am rebuilding a 1975 Yamaha dt400 and am looking for the place where the hose from the oil pump enters the motor.I know there is a banjo fitting there somewhere,but where exactly.I have original Yamaha parts manual and 2 other manuals,but none have the answer.If someone out there knows where this location is I would appreciate the answer . lha
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Old 06-14-2012   #2
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I would suggest looking at the cylinder on the right side. there probably is a bolt that someone replaced the banjo bolt that goes there,
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Old 06-15-2012   #3
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Actually,the Dt400 uses a tube that injects oil into the carb in the intake side. It doesn't have a provision for a banjo fitting for the oil line. I found that my carb is from a '74 Dt360,which didn't have this tube.I drilled a hole and hooked the oil line in and it now runs well and I still run a 50/1 premix in the tank to make sure that oil gets to the motor and to reduce the rust in the tank. lha
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Old 07-09-2012   #4
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whatever u do make sure that it looks like a tough 1!
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Old 07-09-2012   #5
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Got it running,with a barb in the motor side of the carb,like the original has. I have since bought a '75 Dt400 carb for it,rebuilt it,and will put it on when I put a bunch of parts that I got for it,like new throttle cable,Yamaha grips with logo on them,levers and covers,etc. It runs like a scalded dog now!!!! lha
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Old 03-22-2013   #6
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Except for their R&D partnership with Toyota,I wasn't aware that Yamaha made any other products other than world class musical instruments,boat motors. Of course,I don't know everything. lha
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Old 05-30-2013   #7
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The oil line from the pump plugs into the vacuum side of the carburetor, on the left hand side. Untill you are sure that the injector pump is working right, run a 50:1 premix in the tank.

There is also a cable that runs to the injector pump, the throttle cable splits, when the throttle is open more the piston stroke of the injector pump becomes greater allowing more oil to enter the engine.

- John
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Old 05-31-2013   #8
lha
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The barb that allows the oil to enter the carb is on the right side[oil pump side. The Vm32ss carb which is stock on the '75 Dt400 has the barb on it on the side of the carb ,near the enricher[choke] hole. This allows the oil to be atomized and to enter with the gas. I've had the oil pump rebuilt by a craftsman and machinist who rebuilds such things as magneto coils,oil pumps and other items. I still use a mix of about 50/1 of gas/oil,to be sure of how much oil is available and to keep the rust down in the tank. I also use an inline fuel filter,just to be safe,and keep my clean carb clean. lha
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