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Old 02-02-2010, 06:24 PM   #4621
GreyDawggg
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Joined: Aug 2009
Location: Perth, Western Australia
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Cheers

Quote:
Originally Posted by clintnz
Don't panic until you have checked the cam bearings mate. My 640 often had fuzz on the bung (maybe not quite that much tho) & the only thing that's worn out in 80 000 km was the inlet cam follower roller bearing. It could just be that $30 bearing, it may have got bad enough to damage the cam which is quite a bit worse, but nowhere near as bad as a big end failure.

Cheers
Clint
thanks clintnz makes me feel a little better.. I'm going to check that tonight or the night after and try get the bike back together this weekend and take it for a ride and see how it goes.. Think I'll do A few hundred ks and dump the oil again and see the verdict..
There are flat spots on the bore of the slave cylinder so it needs replacing rather than a new o ring.. Is it difficult to replace that bearing in the cam?

Cheers
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Old 02-02-2010, 07:27 PM   #4622
GodSilla
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Location: Village Idiot's residence
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Quote:
Originally Posted by Ogre_fl
Curious, I thought the idea behind the mineral oil based clutch fluid was because it was some what benign should it leak into the engine.
I don't know the reasoning behind the mineral hydraulic oil, but it is not rated for the type of stresses found inside the motor at all. Adding water to your oil would probably have a similar effect, as the stuff is very light. I was first warned by Frank Pons, ex GP and World MX mechanic/tuner, that the stuff needed to be removed ASAP for the health of the big ends. I figured who am I to argue? I just did it.
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Old 02-02-2010, 10:32 PM   #4623
bmwktmbill
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Quote:
Originally Posted by CodyY
on pavement
Increase the tire pressure, increase the preload in the rear.

Are you running bags?
bill
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'02 KTM 640 Adventure-lowered
"On the road there are no special cases."
Cormack McCarthy-The Crossing

The faster it goes the faster it breaks.
And high performance=high maintenance.
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Old 02-03-2010, 07:40 AM   #4624
CodyY
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Location: Fort Worth, TX
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Quote:
Originally Posted by bmwktmbill
Increase the tire pressure, increase the preload in the rear.

Are you running bags?
bill
Lots of rear preload right now. I'm 225lbs and still running stock springs.
It got better when I moved further back on the seat. Tire pressure could have done it. It may have been low.

Wolfman enduro's with maybe 5-8lbs of load. Pair of shoes, handfull of tools, and a change of clothes is all.
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Old 02-03-2010, 11:44 AM   #4625
clintnz
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Location: Rotoiti, New Zealand
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Quote:
Originally Posted by GreyDawggg
thanks clintnz makes me feel a little better.. I'm going to check that tonight or the night after and try get the bike back together this weekend and take it for a ride and see how it goes.. Think I'll do A few hundred ks and dump the oil again and see the verdict..
There are flat spots on the bore of the slave cylinder so it needs replacing rather than a new o ring.. Is it difficult to replace that bearing in the cam?

Cheers
Hi Mate, there is a thread on doing the cam & follower bearing: http://www.advrider.com/forums/showthread.php?t=286283 Not a full how to there but Creeper's re-sealing the rocker cover guide is a very complete guide to dis/reassembling these parts: http://www.advrider.com/forums/showthread.php?t=112127

Cheers
Clint
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Old 02-03-2010, 01:50 PM   #4626
skibum69
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Location: New Melbourne, Newfoundland
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B-Rod, thanks for that link, I'd missed it.
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Old 02-03-2010, 10:07 PM   #4627
bmwktmbill
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Quote:
Originally Posted by CodyY
Lots of rear preload right now. I'm 225lbs and still running stock springs.
It got better when I moved further back on the seat. Tire pressure could have done it. It may have been low.

Wolfman enduro's with maybe 5-8lbs of load. Pair of shoes, handfull of tools, and a change of clothes is all.
It's nice to carry an 12V plug in electric air pump. I tore the plastic off a Walmart model to make mine smaller. It plugs in the electric vest pigtail and wraps in a rag. I either pump up or slow down when I get to pavement.
bill
__________________
'02 KTM 640 Adventure-lowered
"On the road there are no special cases."
Cormack McCarthy-The Crossing

The faster it goes the faster it breaks.
And high performance=high maintenance.
Bill Shockley
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Old 02-04-2010, 03:24 AM   #4628
skibum69
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my pump plugs into the powerlet plug on my console
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skibumsoirée2009 skibumsoiré2010
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RIP ITsteve, ride in peace my friend
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Old 02-04-2010, 07:26 AM   #4629
CodyY
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Location: Fort Worth, TX
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Quote:
Originally Posted by bmwktmbill
It's nice to carry an 12V plug in electric air pump. I tore the plastic off a Walmart model to make mine smaller. It plugs in the electric vest pigtail and wraps in a rag. I either pump up or slow down when I get to pavement.
bill
I've got the slime that plugs into my battery tender lead.
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Old 02-05-2010, 02:54 AM   #4630
bmwktmbill
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Quote:
Originally Posted by CodyY
I've got the slime that plugs into my battery tender lead.
Youre set.
b
__________________
'02 KTM 640 Adventure-lowered
"On the road there are no special cases."
Cormack McCarthy-The Crossing

The faster it goes the faster it breaks.
And high performance=high maintenance.
Bill Shockley
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Old 02-05-2010, 03:55 PM   #4631
mgorman
Crashing since 1964
 
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Location: Massillon, Ohio
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I finally have a pic worth posting.

My ride home from work this evening...

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AES Racing - Crow Canyon Riding Park
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Old 02-05-2010, 04:24 PM   #4632
skibum69
slave to gravity
 
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Joined: May 2006
Location: New Melbourne, Newfoundland
Oddometer: 4,942
lovely shot there
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Beerthief
skibumsoirée2009 skibumsoiré2010
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RIP ITsteve, ride in peace my friend
save $5 on a new smugmug account, use this coupon7frrnSRiTt9Fk
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Old 02-05-2010, 04:29 PM   #4633
mgorman
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Location: Massillon, Ohio
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Thanks, Last week I was going the other way on the 950 and well, let's just say the crash bars came in very handy!
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Old 02-05-2010, 05:00 PM   #4634
Sparrowhawk
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Joined: Sep 2005
Location: Eastern Washington, USA
Oddometer: 1,730
Quote:
Originally Posted by mtbdemon
I have a 1997 620 Adventure and can't seem to find the correct spec for coolant. It seems I might have a leak where coolant is being burnt off, but I'm not sure. Do I need to drain all the coolant and simply put in some prestone? Thanks!

Ken
Use a coolant made for aluminum.

You likely have a water pump seal leak. Look in the LC4 640 sticky http://www.advrider.com/forums/showthread.php?t=86958 and scroll down to just above the somewhat scary looking portrait and check out LC4 Pilot's wisdom.
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Old 02-05-2010, 05:08 PM   #4635
Sparrowhawk
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Location: Eastern Washington, USA
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Quote:
Originally Posted by CodyY
on pavement
New tires? These bikes are famous for the weaves for the first few hundred miles on a new set of rubber. I've had the experience when I put on a 908RR rear with an older front and new Scorpion Pro on the front with an older rear. The symptoms went away after about 300 miles on the tires.
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