Cam timing question


7 replies to this topic
  • Bob East

Posted December 04, 2005 - 01:06 AM

#1

Hi Guys,

One of my buddies has an XR600R that appears to have slipped timing.
He said that the bike tipped over on him and he had some difficulty in
shutting it down while it was on its side. Afterward, he couldn't get it
to start again. So, I'm wondering if something like a defective cam
chain tensioner could allow this to happen? I plan to get my hands
on his bike to see if I can troubleshoot this problem rather than depend
on his accounting of the facts. However, I just want to know if there
is any problem with the cam chain tensioners that might allow the
cam to jump timing?

Rgds,
Bob East

  • creeky

Posted December 04, 2005 - 05:48 AM

#2

I have seen XR cam chains that were REALLY loose and clattering like the hammers of hell, and did not jump time. It's pretty normal for a 600 to start hard after a fall because when the bike is tipped over, a crap load of gas runs into the intake. I'd be really surprised if a tipover would cause the chain to jump time.

  • frankstr

Posted December 04, 2005 - 07:25 AM

#3

I agree with creeky, could not believe that a tip over would cause the bike to jump time,probably flooded real bad.... :p
Pull the spark plug and kick it over with plug out and install a new plug, tmo :applause: :ride:

  • creeky

Posted December 04, 2005 - 09:27 AM

#4

When restarting after a fall, hold the throttle open, pull in the compression release and kick the engine over 8-10 times to clear the combustion chamber of gas and dead air, then do the normal starting drill. If the flooding is severe, you might have to repeat this drill 2-3 times.

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  • Blade Man

Posted December 04, 2005 - 03:13 PM

#5

If he just dumped the bike he could probly use the rest and waiting to start a flooded engine can only help both of them.

  • Bob East

Posted December 04, 2005 - 10:00 PM

#6

Hi Guys,

Thank you for the input. I thought that sounded a bit odd, too. I'll have
to get my hands on his bike and see if I can get it started. I have a new
spare sparkplug I can put into it along with a can of starting fluid to help
the process along.

I think the bike I just bought is in much better shape than my friend's
bike. It looks much cleaner and it seems to run like a Swiss watch.
However, when it's cold, it's a real bear to start. It's already kicked
back on me and tried to launch me over the handlebars. My knee was
sore for a week.

One thing I'm curious about. Has anyone ever tried to power the ignition
with an external battery when starting one of these beasts? I would
think that would provide a much stronger spark and make starting a
bit easier. Anyway, I'll look into it and if I come-up with anything
that seems to work, I'll post it to this forum.

Rgds,
Bob East

  • creeky

Posted December 05, 2005 - 05:16 AM

#7

Bob East............be very careful with starting fluid. Too much of this stuff in the combustion chamber can cause piston damage due to the extremely rapid expansion of gasses this stuff causes when it goes off.

  • oldturtle

Posted December 05, 2005 - 08:32 AM

#8

Hi Guys,
I think the bike I just bought is in much better shape than my friend's
bike. It looks much cleaner and it seems to run like a Swiss watch.
However, when it's cold, it's a real bear to start. It's already kicked
back on me and tried to launch me over the handlebars. My knee was
sore for a week.

I have never had mine kick back because of the automatic decompression system that opens right exhaust valve whenever motor tries to go backwards. I suspect that previous owner replaced cam with aftermarket cam that did not have provision for decompression feature.





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