Sticky throttle

 There's a first time for everything.

While riding the track yesterday, my throttle stuck.  I nearly had a very
bad crash, but somehow saved it at the last second.

This is one more strike against the auto clutch.  Even with a manual
override, at high RPM you cannot disengage the clutch.

I will be replacing the throttle cable, inspecting the bar assembly, and
tearing down the carb to locate the fault.

I discovered why I was fouling so many plugs in Utah.  My coil was bad.  The
primary side measured about half the resistance it should.  The bike worked
much better with a fully functioning ignition.   With a stuck throttle, it
worked too well. :-/

I've never been sold on the auto clutches.  I don't think I would have
bought one myself, but this bike came with one installed.  After the Utah
trip, I was leaning more toward the auto clutch.  This has set back my
expectations.

-Jeff-

 wrote:

So no auto-clutches can be overridden with the lever when revved up?
Makes a great case for a pull-pull throttle.

I had *almost* the same thing happen yesterday.

I was going fairly slow, something snagged my leg, almost pulled me
off the bike, and of course it dialed up the throttle a whole bunch as
I was almost pulled all the way off the bike. Made for a nice wheelie
towards the trees, but I got it slowed down before then. Fortunately,
whatever snagged me pulled me right, if it pulled me left I would
still be lining up volunteers to pull my bike out of the mini-ravine
that was off that way, assuming I was able to get myself out of it.

Dave

 


Revlok's new version may someday allow that capability.   With current
designs, the centripetal force of the actuation balls generates a very high
load at high RPM.  Far higher than the standard clutch springs, thus nearly
impossible to overcome.  This is one of the reasons that the MX'rs have been
slow to adopt auto clutches.

 wrote:


I didn't realize the manual override didn't work at high RPM. Having
had a stuck throttle in the past, I figured that whenever I got around
to trying the auto clutch it would have to have the override feature.
Going to have to re-think that.

Craig

 
Yes, I DO know any bike can be shifted without the clutch.  I ask not
regarding dirtbike use, but simply because I was thinking about the
Harley Davidson clutches.  Harleys barely shift as it is, much less
after 100,000 clutchless shifts.

JayC