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Motorcycle | Starts Up and Instantly Maxes out Revs nomorespameventhoughthejapanes 06-06-2006
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Posted by nomorespameventhoughthejapanes on June 6, 2006, 8:45 pm
I have a 1982 Yamaha Maxim XJ750J. I recently did some restoring on
it; rebuilding the carbs, adding an in-line fuel filter, replacing the
battery, replaced the spark plugs...

It has an electronic ignition and it starts right up, but oddly it goes
from 0 to 12000 RPM's in a few seconds.
The choke is off, the throttles not open on the hand bard... I frankly
don't know what it could be. Is it possible that the carbs are open?
I tested the carbs before I put them back in to check for
synchronization and everything seemed to work.

Any ideas?


Posted by Polarhound on June 6, 2006, 9:52 pm
nomorespameventhoughthejapanesespamgivesmeachuckle wrote:
> I have a 1982 Yamaha Maxim XJ750J. I recently did some restoring on
> it; rebuilding the carbs, adding an in-line fuel filter, replacing the
> battery, replaced the spark plugs...
>
> It has an electronic ignition and it starts right up, but oddly it goes
> from 0 to 12000 RPM's in a few seconds.
> The choke is off, the throttles not open on the hand bard... I frankly
> don't know what it could be. Is it possible that the carbs are open?
> I tested the carbs before I put them back in to check for
> synchronization and everything seemed to work.
>
> Any ideas?
>

The idle adjust screw should not be all the way in :)

Posted by nomorespameventhoughthejapanes on June 6, 2006, 10:20 pm
I figured out the problem. One of the clamps for the intake valve of
the carbs was turned a bad way and when the throttle was open to a
certain point, the mechanism to control the butterflies would hang on
the clamp, keeping it open.

I have a new problem now, hopefully the last, that involves my clutch
not engaging... but I'll leave that to a new thread.

Polarhound wrote:
> nomorespameventhoughthejapanesespamgivesmeachuckle wrote:
> > I have a 1982 Yamaha Maxim XJ750J. I recently did some restoring on
> > it; rebuilding the carbs, adding an in-line fuel filter, replacing the
> > battery, replaced the spark plugs...
> >
> > It has an electronic ignition and it starts right up, but oddly it goes
> > from 0 to 12000 RPM's in a few seconds.
> > The choke is off, the throttles not open on the hand bard... I frankly
> > don't know what it could be. Is it possible that the carbs are open?
> > I tested the carbs before I put them back in to check for
> > synchronization and everything seemed to work.
> >
> > Any ideas?
> >
>
> The idle adjust screw should not be all the way in :)


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