Help. Bought a 750 with a 900 fuel injected engine - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 9 (permalink) Old 01-17-2019, 03:25 PM Thread Starter
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Help. Bought a 750 with a 900 fuel injected engine

Please get all laughs out prior to responding. You can not make this up. Yesterday I bought a 1993 VN 750. It was made into a hardtail bobber. There is a 900 CC VN 900 fuel injected motor installed (Best I can tell). it has things not installed and not replaced. I do have the old 750 engine and equipment. But I aim to get the 900 running. It looks like the 750 radiator is still installed and not connected. gas tank is loose and most of the components are not on tight. What I am mainly wanting is for the engine swap from the 750 to the 900 what are the components needing to get replaced to make it go? did they swap out everything that needs to be? Also when I buy items for the bike (Clutch cable, new hoses and such.) do I buy it for the 750 or the 900? feeling a little out of my scope here. I am a Helicopter mechanic in the military but will need help getting my head around this.
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post #2 of 9 (permalink) Old 01-17-2019, 05:06 PM
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Fuel injection is going to need the 900 harness and computer/controller. I'd hate to jump into the middle of that swap.
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post #3 of 9 (permalink) Old 01-17-2019, 06:48 PM
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is the 900 also a shaft drive?? some vulcans where chain, and I dont know which.

but, as mentioned the engine's wiring harness and computer.. someway to hook the drive shaft up (assuming they didnt swap swing arms, and rear gear stuff)..

its going to be a project, no question.

what might be easier is to see what of the original 750 frame and such is left, it might be better to put the 750 back in.

another question that just popped in mind, does the 900 have a trans thats integral with the engine, or seperate (ala harley)

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post #4 of 9 (permalink) Old 01-17-2019, 09:10 PM Thread Starter
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I have the old motor, tires and wheels. It is chain drive the 900 but there is new chain drive wheels. The harness is set up for the 900. I did notice the clutch cable is missing, pipes not installed, cooling system not connected, foot shift not installed, shift shaft and cover not installed. I want to know if the 750 radiator will work with the 900? I need to buy hose and test the radiator but should I buy the 900 radiator?
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post #5 of 9 (permalink) Old 01-18-2019, 12:13 AM
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I am by far no expert, but I wouldn't see why it wouldn't work. I'd assume bigger engine means more heat, so your fan might kick on more often. As long as the termperature sensor is set up, the fan should still kick on when needed to keep it cool
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post #6 of 9 (permalink) Old 01-18-2019, 08:01 PM
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Yes' buy components that mesh with your engine...
Japanese cluctch cables are pretty universal at the lever, not so much at the actuators.

Radiator hoses would not be a direct fit. But the 750 radiator will do fine. Simply bend wire to route and dig through the bends at the auto parts store.
Make sure to use aluminum safe coolant.

Exhaust pipes will need to be custom or modified...
Do you have a way to tune the ecm?
Fuel pump?
If the chain run is super long consider running a sprung tensioner

We need pics!!!
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post #7 of 9 (permalink) Old 01-19-2019, 02:18 AM
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post #8 of 9 (permalink) Old 02-06-2019, 06:08 PM
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I am definitely curious to see pics on this one.

Especially since the 900 is belt driven and not chain.
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post #9 of 9 (permalink) Old 02-16-2019, 07:28 PM
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If you are looking to off load the 750 V twin engine please contact me as I have a complete bike here waiting for an engine. Only snag is I'm in the UK.
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