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January 24th, 2015, 02:44 PM   #1
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2005 FS650 cam follower bearing win

Having 170 hours on my CFB's I figured I'd better have a look at them.

I'm just taking a break to share, I'll post pics later. Have got to get it back together for a dirty ride in the morning.


Same part as I've done before: 59036061090 bearing complete circa $26 ea.

Only had a little burnishing on the bottom of the pins, equal on intake and exhaust.

New pin is .3005
Old pin at its thinnest is .3000

*this space reserved for pics at a later hour.


Not too shabby for 170 hours.


Chain tool presses the old pins out, a punch 4 times around the perimeter secures the new pin.



When doing valve checks i have been carefully to pay attention to how loose they are and making a mental note of how much if any they need turning to get in spec.

The theory is, if you were to document or remember how much adjusting is needed, that it would directly correlate to how much the pin has worn.

I've checked them at ~40 hours since installing them last year.

I think the key to long life is making sure they never get tight, and most importantly...

SETTING UP THE ROCKER ARMS WITH A LITTLE ENDPLAY.

I had a pair get roached in 80 hours prior to figuring out they need some endplay.

I don't have any specs, I just made sure they had some movement.

I don't recall where I read it, probably here... It's not in the service manual at all. (rocker arm end play)

Now at 520 hours on the engine.
Only work has been valve train refreshing:

Valve springs, valve seals.
Timing chain x2
Cam follower bearings x 3 or is it 4 now, IDR.
Thanks from Bluto, bushmechanic and tourist
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January 24th, 2015, 02:47 PM   #2
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Wow, 520 hours, nothing changed on the bottom end? Very impressive.
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January 24th, 2015, 03:24 PM   #3
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nice Idle

FWIW i use 0.15mm axial play on the rocker arms

ktm rfs spec on the same arms is 0.04 to 0.1 but they have a 1mm oil squirter lubing the top end

IIRC lineaweaver suggested 0.2mm for the bergs but i found that a bit noisy
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January 26th, 2015, 07:22 AM   #4
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Where can I purchase these bearings? I'll have to spec mine up when the engine goes back together.
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January 26th, 2015, 09:42 AM   #5
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Originally Posted by worstinfinland View Post
Wow, 520 hours, nothing changed on the bottom end? Very impressive.

I've never split the cases, the only work has been what I listed above.



Originally Posted by bushmechanic View Post
nice Idle

FWIW i use 0.15mm axial play on the rocker arms

ktm rfs spec on the same arms is 0.04 to 0.1 but they have a 1mm oil squirter lubing the top end

IIRC lineaweaver suggested 0.2mm for the bergs but i found that a bit noisy

thats about what I set them up at. I just guessed last time as I couldn't find me feelers. I found them and set them at .168mm this time.



Originally Posted by tdetlor View Post
Where can I purchase these bearings? I'll have to spec mine up when the engine goes back together.

I bought them at the KTM shop, IIRC they are used in the rfs engines.
Goggle the part number and other suppliers will show up.



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Last edited by Idle; January 26th, 2015 at 09:54 AM. Reason: Pic
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