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1983 Honda Shadow VT750 Build Thread

Old 05-31-2013, 07:26 PM
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Default 1983 Honda Shadow VT750 Build Thread

Ok, so here is where it begins...


And the progress starts...


















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Old 05-31-2013, 07:39 PM
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This is a low budget operation and currently I am looking at moving towards a "bobber". Any suggestion or advice is welcomed. Ultimately, I am aiming for this look,
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Old 05-31-2013, 07:51 PM
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Default Re: 1983 Honda Shadow VT750 Build Thread

You picked the right bike, these make some GREAT bobbers, not to mention, really reliable. I believe there are forums dedicated to this bike and all it's possibilities. Google it.
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Old 06-01-2013, 05:19 AM
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Originally Posted by TATTRAT:8154778
You picked the right bike, these make some GREAT bobbers, not to mention, really reliable. I believe there are forums dedicated to this bike and all it's possibilities. Google it.
Yeah, there are 2 or 3 really big forums dedicated to the Shadow. I have been browsing around on those since right before I bought it looking for information about the bike.
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Old 06-06-2013, 09:43 AM
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Default Re: 1983 Honda Shadow VT750 Build Thread

Shot some starting fluid into the carburetors and cranked the bike. It turned over, but wouldn’t run. I changed the spark plugs, still would not run. Held the throttle open and cranked and would get an occasional single backfire either through the carburetor or the exhaust, and that’s the closest it has been to running.

I arc’d the plug wires to the cooling fins on the block and I’m getting good spark. I’m not sure that it’s at the correct time though.
So to try and figure out what the deal is, I downloaded the factory service manual and went through the ignition system troubleshooting process.

Factory Specs:
Coil Primary Resistance - 2.0
Coil Secondary w/ Plug wires attached - 29 to 40k ohms
Coil Secondary w/out Plug wires - 20.6 to 27.4k ohms
Pulse Generators - 480 ohms ( plus or minus 10%)

My readings:
Coil 1 Primary - 2.8
Coil 2 Primary - 2.5
Coil 1 Secondary w/ Plug wires attached - 33
Coil 2 Secondary w/ Plug wires attached - 34
Coil 1 Secondary w/out Plug wires - 23
Coil 2 Secondary w/out Plug wires - 24
Pulse Generator Cylinder 1 - 425
Pulse Generator Cylinder 2 - 438

The pulse generators are where I believe the problem may be. They relate to the timing, like a cam or crank sensor does in a car. Cylinder 1 doesn’t meet specification and Cylinder 2 barely does. I’m just wondering how conclusive that necessarily is.

It does have compression, spark, and fuel...so in my mind it has to be timing issue. The only other thing on the bike that is left is the 3 CDI igntion boxes, but I'm thinking that if they were bad then I wouldn't have ANY spark...
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Old 06-25-2013, 05:56 PM
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So, after getting the ignition bull shit straightened out it fires up and eventually runs out of fuel. I am guessing the fuel pump is not producing the volume necessary to keep the bowls full.
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Old 06-25-2013, 07:01 PM
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Default Re: 1983 Honda Shadow VT750 Build Thread

Well, that sounds like an easy fix. Welcome to the world of a project.
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Old 06-25-2013, 07:06 PM
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Default Re: 1983 Honda Shadow VT750 Build Thread

I'll be paying close attention to this. I've been looking at these for the same reason

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Old 06-25-2013, 08:06 PM
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Yeah, pulse generators are difficult to locate for those bikes. Installing isn't bad really, even though they are inside the crankcase on the right side of the bike.

After tinkering more, I am fairly sure that the fuel pump is the issue as well. Because as long as gas stays up there, it will start, idle, and rev with no problems. after it runs for a second I can't see anymore fuel coming up through the clear hose until i put my hand over the carb and the suction from the cylinder pulls more through because it cant suck air.

Hoping for another easy fix...
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Old 07-25-2013, 05:40 AM
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Default 1983 Honda Shadow VT750 Build Thread

^ how's it going?
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