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June 27th, 2004, 01:57 PM   #1
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Joined: Jun 2001
From: Pasadena Ca.

Posts: 1,355
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I Ride:
2003 Camfollower Wear

I was one of the fortunate few that got a pair of OEM 2003 rocker arms at a great price when Husaberg had some spares from their early test program to market in Europe. Thank you again 'maichusa'.

I ran them in my 2000 FE501E and have just replaced the Intake follower after a mixed run of 99.3 hours.

31.5 hours on an original 55 cam shaft

19.2 hours on a Lineaweaver X1 camshaft, with numerous changes in valve clearance up to 0.010" to try and tune more bottom end into my 'small displacement 501' while using a high overlap racing camshaft.

48.6 hours on a Lineaweaver X2 cam shaft running 0.004" intake and 0.006"exhaust valve clearance.

I noticed a steady increase in top end noise over the last 20 - 30 hours or so and decided to take a look. I determined that the cam chain rollers were starting to make noise on the steel cam sprocket, and that I would change it out (the chain), since it now had 320 hours on it.

While in there I decided to remove the intake cam follower. The needle bearing axle was worn 0.004", not bad for 99.3 hours considering some of it was run on high valve clearance. The wear was 1/2 of the same wear on a set of Husqvarna cam followers I ran for 91.1 hours under ideal 0.004" valve clearance.

So I can safely say that they should last twice as long as the original followers Husaberg used through 2002 model year.

One of the things I did notice though is that the inside of the arms were worn from axial thrust of the follower needles, a condition that I did not see on the original Husaberg rocker arms until disassemble(for evaluation) at 221.4 hours..

In fact, the 2003 arms had more (eyeball maybe twice as much) wear on the inside of the arms at 99.3 hours as the original 2000 arms has after 221.4 hours. This includes a gradually increasing track that kind of stops in a pocket at the peak of opening stroke.

In summary, I am interested in similar data from 2003 riders and others using 2003 arms to see what they have experiened. I am hoping that the wear in the inside of the arms is a fluke caused by the high valve clearance I was running during part of this period.

AS to the Lineaweaver cam, I can't say enough about how pleased I am. When I get my new 550 (04 0r 05). that will be one of the first improvements I make. My jury is still out regarding the counter ballancer.

Regards,

Joe
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