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Old 11-05-2011, 07:17 AM   #1951
Lortdadu
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What's the original size of the clutch friction plates?
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Old 11-06-2011, 12:08 PM   #1952
clintnz
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Quote:
Originally Posted by Lortdadu View Post
What's the original size of the clutch friction plates?
2.7mm for the 640 IIRC. Mine were still new spec at 95K km & a good bit of abuse, to trash an LC4 clutch at less than 10K...

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Old 11-06-2011, 01:12 PM   #1953
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Quote:
Originally Posted by clintnz View Post
2.7mm for the 640 IIRC. Mine were still new spec at 95K km & a good bit of abuse, to trash an LC4 clutch at less than 10K...

Cheers
Clint
Alright, thanks.

Yeah, I was horrified about this as well, but I came into the conclusion that the clutch plates must've been changed from another bike, as that one was used for salvage parts. So it might be that the clutch is from a bike that has seen more mileage.

But anyways, better swap them for new ones to pull the front wheel off the ground.
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Old 11-07-2011, 01:53 AM   #1954
Alik
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Hmm… are You sure of the mileage? It is easier to swap a odometer than the friction plates ;)
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Old 11-12-2011, 07:36 AM   #1955
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Quote:
Originally Posted by Alik View Post
Hmm… are You sure of the mileage? It is easier to swap a odometer than the friction plates ;)
Pretty sure, the odometer was on the bike itself. While the cylinder head was swapped to a bent one so I had to take it for machining to get the surface straight again, it also had a busted e-starter. Therefore I wouldn't be surprised if the clutch was changed from another bike. But I'll never know.

Edit. Now that I have my clutch open, do you think a 400cc LC4 requires the main bearing change?
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Old 11-12-2011, 06:46 PM   #1956
Low594
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Quote:
Originally Posted by Lortdadu View Post
Pretty sure, the odometer was on the bike itself. While the cylinder head was swapped to a bent one so I had to take it for machining to get the surface straight again, it also had a busted e-starter. Therefore I wouldn't be surprised if the clutch was changed from another bike. But I'll never know.

Edit. Now that I have my clutch open, do you think a 400cc LC4 requires the main bearing change?
good question! I dont know. But what i want to know is, where are the pics??
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Old 11-12-2011, 10:10 PM   #1957
gunnerbuck
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Quote:
Originally Posted by Lortdadu View Post
Pretty sure, the odometer was on the bike itself. While the cylinder head was swapped to a bent one so I had to take it for machining to get the surface straight again, it also had a busted e-starter. Therefore I wouldn't be surprised if the clutch was changed from another bike. But I'll never know.

Edit. Now that I have my clutch open, do you think a 400cc LC4 requires the main bearing change?
Take the clutch basket off an it is pretty easy to tell, If you see a roller bearing in the case holding the main shaft then you already have the upgraded bearing... If you see a ball bearing, then you have the old style bearing which many owners have changed out ... With the lower power of the 400 the ball bearing VS roller may be less of an issue...
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Old 11-13-2011, 02:51 AM   #1958
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Ha! Lucky I didn't order the new clutch set yet! I started to question my own measurements as well thanks to your posts, and had done a measurement error! The clutch friction plates were between 2.64-2.68cm, I guess I must have measured it a bit wrong. But anyways, probably would've bought a new set if I wouldn't have remeasured it.... Gotta be more careful when measuring.

Do you have any other idea then what could be causing the clutch to jerk? When I'm slipping the clutch to accelerate from stop, the bike starts to twitch? or kind of jump forward and then take revs again. Could a bad oil cause this or some scrap in the oil? Because my filters had quite a bit of old gasket material in it.

I'll post a pic later of the main bearing. How expensive is the new main bearing?
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Old 11-13-2011, 05:46 AM   #1959
dirty_sanchez
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Lort- I vote for less than stellar oil along with suspect floating contaminates.

My YZ450 with a Rekluse auto-clutch behaved in a similar way after it had set unused for about 9 months. It took a few oil changes and a few back to back weekend rides to get it back where it behaved normal again.

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Old 11-13-2011, 07:05 AM   #1960
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Cool2

Quote:
Originally Posted by Lortdadu View Post

I'll post a pic later of the main bearing. How expensive is the new main bearing?
Take pic and let us know.

As for the bearing and puller I might have both.

The puller for sure but the bearing I will have to check in my spare parts after my LC4 rebuild.

I too just replaced my main bearing, then the motor went up in smoke. The new main bearing came in the kit with all the other new stuff.
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Old 11-14-2011, 10:13 AM   #1961
BRYANDENNY71
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Is there a Remote Tripmaster Switch for my '99 640 Adventure?

The one I found only shows it to fit '02+ 640 models.

It has this model Tripmaster Speedo. (Not my bike)

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Old 11-15-2011, 07:27 AM   #1962
DesignerRider
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flywheel puller

Anybody around Orange Country or San Diego have a flywheel puller I can utilize? I have an exploded flywheel to tackle.
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Old 11-15-2011, 08:29 AM   #1963
mxchamp
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Originally Posted by DesignerRider View Post
Anybody around Orange Country or San Diego have a flywheel puller I can utilize? I have an exploded flywheel to tackle.
I have one but live in Iowa.

If you can't find one I will let you borrow mine.

Remember reverse threads!
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Old 11-15-2011, 11:28 AM   #1964
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Quote:
Originally Posted by DesignerRider View Post
Anybody around Orange Country or San Diego have a flywheel puller I can utilize? I have an exploded flywheel to tackle.
i have a 2003 640 ADV, after digging around in the 640 forums I was able to sort out what i needed. I got this on ebay for around $35:
MOTION PRO FLYWHEEL PULLER M33x1.5 RH INT YAMAHA (140580540941)

Worked like a charm. sucked to have to buy it, but the sprag clutch doesn't seem to reliable and i expect to use the puller every now again over the years. if you were a little farther north, you'd be welcome to borrow mine!
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Old 11-16-2011, 04:33 AM   #1965
laramie LC4
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finally got a sneak peak at some parts of my new engine rebuild.

ported and polished head...



and my new/old - 43mm Gen 1 FCR....



hopefully one of these days i'll have the rest of the engine to boot....

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