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post #1 of 16 (permalink) Old 01-10-2017, 07:54 PM Thread Starter
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Best place to start looking?

Took a ride on my 04 750 Aero today (70 degrees ) Ran fine until heading home it felt like it was running out of gas so I reach down and switch tbrakes o reserve. It made no difference. I have addd gas and the bike will start fine and I can rev it up. But when I go to release the clutch there is no power and the engine will die immediately unless the clutch is pulled in and accelerator fanned. Tomorrow I'll start checking things but if you have a suspicion where the problem might be please chime in. I recently removed and cleaned the carb and replaced the accelerator pump but it's been running fine.


Last edited by NewOldRider; 01-11-2017 at 04:37 PM.
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post #2 of 16 (permalink) Old 01-10-2017, 09:59 PM
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check the vacuum line to the fuel tap, if that is kinked your fuel delivery is restricted at best, check the fuel line as well

Could be **** in the main jets



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post #3 of 16 (permalink) Old 01-11-2017, 02:48 AM
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Make sure battery/connections are good. I wasted a lot of time diagnosing a VT750 that stalled and turned out battery cables were loose.

With bike parked, it starts OK and engine runs ok at all throttle positions? If that is OK but you are lacking power (ie letting clutch out) it sounds like you maybe running on one cylinder. I would first check by pulling one spark plug lead at a time to determine if an electrical problem. Next pull plugs to check condition. Post results.

G.

P.S. Sometimes I miss contact breakers. Sure they needed adjusting and they wore out but at least you could see/measure what was up. And cheap. ICM and IPG are way more reliable if everything is OK but if not then who knows? And expensive. On the other hand I love my hydraulic self adjusting valves.

Last edited by gdb069; 01-11-2017 at 02:59 AM.
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post #4 of 16 (permalink) Old 01-11-2017, 06:45 AM
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I read this last night, slept on it and I still ain`t got a suggestion...
However, my thought does lean toward fuel related issues...
BUT, then again electrical is possible, a loose disconnection is VERY suspect too



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post #5 of 16 (permalink) Old 01-11-2017, 09:34 AM
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You might also check the tank vent tube, which lets air back in so the fuel can flow out. If that is partially plugged, like from a bug crawling up in it and dying, it can also cause the symptoms you're seeing. Just take it off at the tank and blow compressed air through it.


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post #6 of 16 (permalink) Old 01-11-2017, 12:46 PM
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Ya I would say fuel / air problem. My friends vulcan did this same thing when a tiny piece of his air filter got stuck in one of the tubes going into the carb. As soon as he revved the engine it would bog down and die.

Also you might want to check your petcock. Have you fed it today? Hahaha just kidding but it might be clogged with sediment or something.


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post #7 of 16 (permalink) Old 01-12-2017, 12:57 PM Thread Starter
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Petcock is good. Flows when I apply vacuum. Vacuum hose to the petcock appears sound. Have spark to both cylinders and the plugs look good. Tank vent is open. Can't find any loose connections. I've taken the carb off once again and I'll take it apart after my frustration level drops. Poo!
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post #8 of 16 (permalink) Old 01-12-2017, 01:08 PM
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Try to duplicate the symptom and add some choke to see if any thing changes.

Only a biker knows why a dog sticks his head out of a car window.
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post #9 of 16 (permalink) Old 01-12-2017, 01:18 PM
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My old '83 750 doesn't have a kickstand switch but I hear other guys talking about theirs when they fail and can't start. But some of you guys with later bikes can chime in here= Does the kick stand switch kill the engine when it is running? Since he said when he lets out the clutch out the engine dies, could it be related to a failing kick stand switch ???

Only a biker knows why a dog sticks his head out of a car window.
1983 750 Shadow
From the past=
1951 Cushman scooter
1962 Honda 305 Dream
1965 Honda 305 Dream
1971 Honda 175 scrambler
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post #10 of 16 (permalink) Old 01-12-2017, 03:10 PM
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Quote:
Originally Posted by swifty2014 View Post
My old '83 750 doesn't have a kickstand switch but I hear other guys talking about theirs when they fail and can't start. But some of you guys with later bikes can chime in here= Does the kick stand switch kill the engine when it is running? Since he said when he lets out the clutch out the engine dies, could it be related to a failing kick stand switch ???
It will.

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