Dead Hellsickle.
Jeff Deeney
No solution yet, but the ignition is firing very irregularly. Cranking it
over with the valve caps off, and a strobe on the ignition, it isn't firing
every stroke. Sometimes it will fire a couple in a row, then go a few
revs without firing.
The pickup sensor and coil all measure fine. So do the sidestand
and neutral switches.
Still stumped. The ECM is the last thing I want to try swapping.
-Jeff Deeney- ©2005 DoD#0498 NCTR UTMA BRC COHVCO AMA
jldeeney@c om c ast d ot net '99 ATK 260LQ-Stink Wheels '94
XR650L-HellSickle
We don't stop riding because we get old, we get old because we stop riding.
zod...@yahoo.com
dangled it for untold miles around ouray hanging by the wiring harness.
That may well have been a contributing factor to it's demise? ;-) I've
since reinforced the mount, and siliconed some lexan over the hole
ground in the battery carrier case.
I did the same checks, and nervously ponied up $150 for a new CDI and
that was the problem. I suppose I could send you mine for testing
purposes if you'd like. I still can't figure how to get to ABPM, but
good on ya for loaning your bike. DK a.k.a.
zodran@yahoo.....c...o..@#$m.
XR650L_Dave
er, um, oh yeah. I belong to a number of sites with a bunch of XRL
owners, and this sounds like (one of) the classic symptoms of a CDI
going south.
The other classic symptom is running for a few minutes, dying, then
recovering in a few minutes.
-DDave
spodely
"Jeff Deeney" <jldeeneyr...@comcast.net> wrote in message
news:iKednd1DwIX...@comcast.com...
snip
>
> Still stumped. The ECM is the last thing I want to try swapping.
If it helps, that what my TT600 did. New (used, but new to me) one fixed
it.
John
XR650L_Dave
If you want to bypass all start-and-run safeties, just take the 2 wires
going to the clutch switch, and short them BOTH to ground.
DDave
oldfart
the spark plug cap off, remove 1/4" of insulation with your boy scout
knife, bend the wires back around and replacing the cap. That works for
me sometimes. OF
XR650L_Dave
failing as well.
-DDave
Jeff Deeney
"XR650L_Dave" <spamT...@yahoo.com> wrote in message
news:1114885633....@f14g2000cwb.googlegroups.com...
> Hmm, that reminds me, the resistors in the plug caps are prone to
> failing as well.
The spark plug wire ohms out to exactly what it should. I'll check to
see if I've already yanked the resistor out of the cap.
I've got the CDI in the freezer right now. If it's an open solder joint
or cracked component, it will probably be sensitive to temperature.
After an hour or so in the freezer, I'll put it in the bike & check the
spark
regularity with the strobe light.
Jeff Deeney
"spodely" <spo...@carolina.rr.com> wrote in message
news:lvNce.1007$ED2....@twister.southeast.rr.com...
After more probing, that looks like it. I could change the temperature of
the
ICM (Ignition Control Module) and get the behaviour to change. Looks
like I'll order a new one on Tuesday.
Rowdy is very lucky this didn't happed a few miles earlier, or he would
have been in the middle of 5MOH. I'd always thought it would be
impossible to get a dead bike out of there, but with 6 guys and a couple
of straps, pulling it up ledges seemed to be easier than everyone expected.
-Jeff Deeney- DoD#0498 NCTR UTMA BRC COHVCO AMA
Jeff Deeney
Damn, replacing the ICM with a known good unit didn't work.
I found out my inductive timing light is working intermittently.
Using an old timing light & checking the spark plug
indicates an OK spark.
Back to checking the valve timing.
BTW, compression only measured 50, but that's with a
cold engine. I'm gonna have to pop the valve cover for
the next step.
Jeff Deeney
"Jeff Deeney" <jeff....@removespam4good.hp.com> wrote in message
news:v2Bde.4827$wN6....@news.cpqcorp.net...
>
> Damn, replacing the ICM with a known good unit didn't work.
>
> I found out my inductive timing light is working intermittently.
> Using an old timing light & checking the spark plug
> indicates an OK spark.
>
> Back to checking the valve timing.
Double Damn. Valve timing is close. I think a slight
stretching in the chain has resulted in a small error.
Time to tear the cam out & check all the decompression &
anti-kick back gizmos. The decompression cam feels a little
flakey.
Once the cam is out, it's tempting to pull the head & do the valves.
While the head is off, maybe a new piston, ring, and top end
bearing. The bike does have 28k miles on it. Perhaps it will
need a bore job.
Creeping repairism...
Craig Faison
> Once the cam is out, it's tempting to pull the head & do the valves.
> While the head is off, maybe a new piston, ring, and top end
> bearing. The bike does have 28k miles on it. Perhaps it will
> need a bore job.
>
> Creeping repairism...
Rowdy is footing the repair bill, right? I think it needs a new crank too.
;-)
Craig
Jeff Deeney
"Craig Faison" <cfa...@magpage.com> wrote in message
news:Pine.BSF.4.33.050503...@alaska.magpage.com...
I think it's broken because it doesn't have the HRC oversize
bore and hot cam.
I think some of the guys putting in hot cams junk all the decompression
& anti-kick back stuff. I wonder if I even need that junk, since it's
e-start only.
XR650L_Dave
>From the rare occurrence dapertment:
On some XRLs the valve seats start to embedd in the head, the valves
get tight, you loosen the valves, etc. etc. and this goes on for
awhile, then one day the seats are just dangling off the valves.
Once in awhile the cam-chain tensioner stops tensioning, and the chain
skips a tooth
I guess either one could cause low compression- 50psi sounds awful low!
I think I heard once, just once, about a problem with the decompressor
sticking.
If you freshen things up, I hear good things about the stage-1 cam if
you're looking for more top end.
Good luck, and I'm waiting to hear what it was.
-DDave
Jeff Deeney
> 28K? Its just broken in!
> >From the rare occurrence dapertment:
>
> On some XRLs the valve seats start to embedd in the head, the valves
> get tight, you loosen the valves, etc. etc. and this goes on for
> awhile, then one day the seats are just dangling off the valves.
Jiggling the valves on the trail, it still had a little play.
> Once in awhile the cam-chain tensioner stops tensioning, and the chain
> skips a tooth
That seems fine. Cam timing was off maybe 1/4 a tooth due to a
slightly stretched cam chain.
> I guess either one could cause low compression- 50psi sounds awful low!
That was cold. But yeah, I think something else is causing it to lose
compression.
> I think I heard once, just once, about a problem with the decompressor
> sticking.
Mine feels very notchy. I'm going to tear into it to see if there isn't a
broken spring somewhere.
> If you freshen things up, I hear good things about the stage-1 cam if
> you're looking for more top end.
From past experience with XRs, I'm going to stay with stock
for the best durability. The cam lobes look fine.
> Good luck, and I'm waiting to hear what it was.
Me too. I'm really leaning toward pulling the head to
do the valves & piston while I'm at it.
Jeff Deeney
Even at 30psi, there's a pretty good breeze coming back
out the intake. Time to remove the head & go thru all of
the valves.
-Jeff Deeney- DoD#0498 NCTR UTMA BRC COHVCO AMA
zod...@yahoo.com
Good Luck, I went with a megacycle cam, not a lot more lift, maybe
.010, but more duration and overlap. I believe the max bore you can go
to is 102.4mm without machining the cases, that gives you another 25ccs
of displacement. I don't think the extra 25ccs does that much, but
raising the compression to 10.5:1 and the mild cam work very well
together on pump gas. I got hardened rockers but think I should have
saved my $$$'s.
My cv carb had a nasty habit of the needle falling out, that might be
something to check.
I ran it up for an inspection earlier, the tag expired saturday, oops.
A countershaft seal, new front brakes and a new front tire and I'll be
ready for more thin colorado air in a few months. Dean K.
Jeff Deeney
> Tonight I hooked compressed air to the spark plug hole.
> Even at 30psi, there's a pretty good breeze coming back
> out the intake. Time to remove the head & go thru all of
> the valves.
And the answer seems to be...
Massive amounts of loose carbon in the cylinder, most likely keeping
some intake valves from closing. When I pulled the head, huge
chunks of carbon were laying in the cylinder. Filling the combustion
chamber with mineral spirits shows both intake valves quite leaky.
When I take the valves out, I'll bet I find carbon on the seats.
My guess is that it got really loaded up with a dirty air filter the
previous day. The next day the filter was changed & Rowdy
rode 5MOH. This is one of the few places I've ever fouled
a plug, due to all of the slow riding. When he gave it 80%
throttle to climb a rock in the Iron Wash, I'll bet some big
pieces of carbon broke loose & lodged in the valves.
Thinking about it, we should have tried to pull start the bike
once we got to the road. If we could have got her started &
rev'd a bit, we might have blown most of that carbon out of
there.
It was a good excuse to do the top end anyway.
-Jeff Deeney- ©2005 DoD#0498 NCTR UTMA BRC COHVCO AMA
jldeeney@c om c ast d ot net '99 ATK 260LQ-Stink Wheels '94
WoodsChick
Jeff Deeney wrote:
> "Jeff Deeney" <jeff....@removespam4good.hp.com> wrote in message
> news:XfUde.4888$Qr7....@news.cpqcorp.net...
> > Tonight I hooked compressed air to the spark plug hole.
> > Even at 30psi, there's a pretty good breeze coming back
> > out the intake. Time to remove the head & go thru all of
> > the valves.
>
> And the answer seems to be...
<snip good detective work>
> Thinking about it, we should have tried to pull start the bike
> once we got to the road.
Well...that *was* my suggestion, but I don't think anyone took me
seriously, for some reason <G>
> It was a good excuse to do the top end anyway.
Glad you got it all figured out.
> -Jeff Deeney- ©2005 DoD#0498 NCTR UTMA BRC COHVCO AMA
Tami-
Jeff Deeney
"WoodsChick" <TamiR...@msn.com> wrote in message
news:1115205984....@f14g2000cwb.googlegroups.com...
> > Thinking about it, we should have tried to pull start the bike
> > once we got to the road.
>
> Well...that *was* my suggestion, but I don't think anyone took me
> seriously, for some reason <G>
Well, pull starting it in the bottom of Iron Wash would have been
impossible. The night before those guys pushed the bike up the hill
several times and tried bump starting with no success. It might have
taken a few hundred yards of pulling to get it going.
I thought about pull-starting it afterwards, until I realized that we
had forgotten a vital component. You weren't around to give
Rowdy vocabulary lessons prior to pull starting. ;-)
-Jeff Deeney- DoD#0498 NCTR UTMA BRC COHVCO AMA