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Valkyrie Riders Cruiser Club > General > 1500 Tech Board > vibration under acceleration
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Author Topic: vibration under acceleration  (Read 766 times)
musclehead
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Posts: 7245


inverness fl
« on: September 04, 2013, 03:34:17 PM »
almost felt like it was running out of gas. runs fine when it gets up to speed, but when you accelerate the harder you hit it the harder it 'stutters' vibrates. never felt this before, seems odd it runs ok at whatever speed just when hitting the throttle. drive line? U-joint? 35,000 miles needs a new rear tire, not going to count that out.

just tore the carbs apart and soaked the parts last month, ran much better since then.

petcock?

thanks in advance.....
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'in the tunnels uptown, the Rats own dream guns him down. the shots echo down them hallways in the night' - the Boss
Patrick
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Posts: 15433


VRCC 4474

Largo Florida
« Reply #1 on: September 04, 2013, 04:13:59 PM »
Your description of the stutter would kinda/maybe indicate a fuel delivery/petcock issue. Are you still using an original style ?
To me a vibration would indicate something else, but, everyone has their own description of things.
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musclehead
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inverness fl
« Reply #2 on: September 04, 2013, 04:20:23 PM »
Quote from: Patrick on September 04, 2013, 04:13:59 PM
Your description of the stutter would kinda/maybe indicate a fuel delivery/petcock issue. Are you still using an original style ?
To me a vibration would indicate something else, but, everyone has their own description of things.

when I hit the throttle in neutral, no problems. replaced the petcock years ago. will check up on it.
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'in the tunnels uptown, the Rats own dream guns him down. the shots echo down them hallways in the night' - the Boss
Michvalk
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Posts: 2002


Remus, Mi
« Reply #3 on: September 04, 2013, 04:21:13 PM »
I would take a look at the Ujoint and driveshaft splines. Could be a fuel delivery issue, but, with the previous work, who knows. Check the vent tube for kinks cooldude
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Moonshot_1
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Posts: 5113


Me and my Valk at Freedom Rock
« Reply #4 on: September 04, 2013, 08:10:13 PM »
Really dirty air filter? Just can't get enough air on the heavy throttle maybe? Just a wild guess.
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Mike Luken 
 

Cherokee, Ia.
Former Iowa Patriot Guard Ride Captain
musclehead
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inverness fl
« Reply #5 on: September 05, 2013, 03:44:26 AM »
felt like it was starving for gas, but, only does it's thing in gear.

makes me think drive line. however I did just do a el cheapo oil change and went from a steady synthetic diet to regular dino oil. shouldn't make a difference right?
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'in the tunnels uptown, the Rats own dream guns him down. the shots echo down them hallways in the night' - the Boss
Regis
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Posts: 643

Columbus, In.
« Reply #6 on: September 05, 2013, 03:50:41 AM »
just remember that reving in neutral puts no load on the engine . If you feel a fuel feed starvation while motoring , that's probably what it is .
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musclehead
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inverness fl
« Reply #7 on: September 05, 2013, 06:03:38 AM »
ok thanks guys, I'll start with fuel suply and end up on the drive train this weekend.

just what i wanted to do  uglystupid2
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'in the tunnels uptown, the Rats own dream guns him down. the shots echo down them hallways in the night' - the Boss
Tx Bohemian
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Posts: 2274

Victoria, Tx
« Reply #8 on: September 05, 2013, 01:25:05 PM »
Quote from: musclehead on September 05, 2013, 06:03:38 AM
ok thanks guys, I'll start with fuel suply and end up on the drive train this weekend.

just what i wanted to do  uglystupid2

Not sure what a "running out of gas" shutter feels like but otherwise what you're describing sounds like a bad plug wire.
I'm just remembering from my old car mechanicing days.

Mine had a similar vibration (under load) and I adjusted and synced my carbs and that helped tremendously.
Since you did carb work I take it you did that.
How about a possible vacuum leak?
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Remember, if you are on a bike and wreck with a car no matter how "in the right" you are you are going to lose. RIDE LIKE EVERBODY IS OUT TO GET YOU!!
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