- Joined
- Nov 20, 2001
- Messages
- 17,028
- Location
- Ely, England
Rocker-arm roller bearings and pins
This is for all '01 and '02 machines with rockers: Part# Intake: 200 281-01 and exhaust: 200 283-01. An upgrade is VITAL or continual replacement every two years of average use (as a precation). The factory modification was to increase the pin size from 7.6mm to 8.0mm for '03+ and this used a smaller needle rollers. This means that all '99 - '02 rockers can't be updated as the rocker arm holes are of course too small. They must either have (more of the same old, same old) new follower bearings fitted or a complete replacement rocker arm assembly. You can buy the complete arm or save your old tappet screw and locknut to save a little.
Rocker arms complete from the '03 fit the above models as a direct upgrade. Part#: Intake 200 330-01 and Exhaust 200 331-02. Bearings fitted by the factory look like a pin inside a hollow dowel from the side (explode the below left photo to see it more clearly), for repeated procedure by mechanics etc the view is of a simple pin with punch marks etc to keep the pins from drifting during use (explode the below right photo to see it more clearly).
For 2004, all Husaberg heads came with the smaller valves (35/30 as opposed to 37/30)and now share rocker arms with the later (see ++ below for old larger arms) model KTMs. Part#: Intake 590.36.060.144 and Exhaust 590.36.061.144. As mentioned in 'tuning', the inlet valves on all 470cc+ engines were 37mm and set wider and further from the cam. The inlet rocker arm is now shorter in reach to take this into account. The 400 had the follower problems but the rocker arm size of today's bikes is still OK for it as it ran the 35/27 head.
Follower bearings need an end float of between 0.25 - 0.30mm. This can disappear when punching the edges of the pin so be careful!
++If you find it difficult to get the earlier rocker assemblies look up the 2000 exc 525KTM parts. The ktm has the same part # as the Berg. (Flatchat)
so have i finally got this right?
another question?
what is the bearing code difference between the earlier bearing and later?
the sherco has an 8mm pin and unfortunately i have to buy the complete rocker arm unless i can find a piece of 8mm silver steel (or whatever) and the right follower bearing to suit.
regards
Taffy
This is for all '01 and '02 machines with rockers: Part# Intake: 200 281-01 and exhaust: 200 283-01. An upgrade is VITAL or continual replacement every two years of average use (as a precation). The factory modification was to increase the pin size from 7.6mm to 8.0mm for '03+ and this used a smaller needle rollers. This means that all '99 - '02 rockers can't be updated as the rocker arm holes are of course too small. They must either have (more of the same old, same old) new follower bearings fitted or a complete replacement rocker arm assembly. You can buy the complete arm or save your old tappet screw and locknut to save a little.
Rocker arms complete from the '03 fit the above models as a direct upgrade. Part#: Intake 200 330-01 and Exhaust 200 331-02. Bearings fitted by the factory look like a pin inside a hollow dowel from the side (explode the below left photo to see it more clearly), for repeated procedure by mechanics etc the view is of a simple pin with punch marks etc to keep the pins from drifting during use (explode the below right photo to see it more clearly).
For 2004, all Husaberg heads came with the smaller valves (35/30 as opposed to 37/30)and now share rocker arms with the later (see ++ below for old larger arms) model KTMs. Part#: Intake 590.36.060.144 and Exhaust 590.36.061.144. As mentioned in 'tuning', the inlet valves on all 470cc+ engines were 37mm and set wider and further from the cam. The inlet rocker arm is now shorter in reach to take this into account. The 400 had the follower problems but the rocker arm size of today's bikes is still OK for it as it ran the 35/27 head.
Follower bearings need an end float of between 0.25 - 0.30mm. This can disappear when punching the edges of the pin so be careful!
++If you find it difficult to get the earlier rocker assemblies look up the 2000 exc 525KTM parts. The ktm has the same part # as the Berg. (Flatchat)
so have i finally got this right?
another question?
what is the bearing code difference between the earlier bearing and later?
the sherco has an 8mm pin and unfortunately i have to buy the complete rocker arm unless i can find a piece of 8mm silver steel (or whatever) and the right follower bearing to suit.
regards
Taffy
