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Valkyrie Riders Cruiser Club > General > 1500 Tech Board > Runs rough when I get on the throttle
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Author Topic: Runs rough when I get on the throttle  (Read 1658 times)
FireValk
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Posts: 10
« on: June 23, 2009, 04:36:29 PM »
My bike runs and accelerates fine unless I really get on the throttle.  I notice the problem most on the highway in 5th gear.  Something seems to be holding the bike back and it shakes a little.  It runs fine if I am just cruising.  Any suggestions?
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Hoser
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child of the sixties VRCC 17899

Auburn, Kansas
« Reply #1 on: June 23, 2009, 11:57:06 PM »
If you are crankin the throttle at 50 or below, a little vibration is normal for a short time.  A kick down to 4th will cure it.  Sixty or above shouldn't happen.  This is just a slight vibration, if it's really shakin, there is a problem.
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FireValk
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« Reply #2 on: June 24, 2009, 04:08:06 AM »
I get the vibration/shaking above 60.  I can accelerate slowly without a problem but get the moderate shaking when I get on it.  Any ideas where I should start to look?  Maybe synch the carbs?
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Warlock
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Magnolia, Ms


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« Reply #3 on: June 24, 2009, 05:56:58 AM »
Quote from: FireValk on June 24, 2009, 04:08:06 AM
I get the vibration/shaking above 60.  I can accelerate slowly without a problem but get the moderate shaking when I get on it.  Any ideas where I should start to look?  Maybe synch the carbs?
Does it sound like the motor is starving for gas? The vibration could be coming from a bad u-joint.
David
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FireValk
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« Reply #4 on: June 24, 2009, 09:45:30 AM »
It does almost sound like it might be starving for gas.  I have run 2 tanks of gas with Seafoam through it without any noticable change.
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mmvalk
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Boynton Beach, FL
« Reply #5 on: June 24, 2009, 10:01:53 AM »
RPM?  the bike tends to 'vibrate' a bit when accelearting within the 2500 - 3000 RPM range.  As far as I know, that's normal behavior for a Valk.
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Wago
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Posts: 14
« Reply #6 on: July 01, 2009, 12:26:47 PM »
Quote from: FireValk on June 23, 2009, 04:36:29 PM
My bike runs and accelerates fine unless I really get on the throttle.  I notice the problem most on the highway in 5th gear.  Something seems to be holding the bike back and it shakes a little.  It runs fine if I am just cruising.  Any suggestions?

Fuel valve - probably a bad diaphraghm.  Install repair kit or replace with a Pingel. (test b4 replacing - if the valve won't hold vacuum, repair or replace),
Wago
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