incorrect info

Taffy · Nov 18, 2006

i've just fitted some new cam follower bearings tonight. looking from the side, i couldn't see this 'ring' in the ends of each pin. so i called the dealer over this and he explained that that "hollow dowel with a pin inside" look was actually only the machine at the factory pressing them in to stay. so when i fit them there is only the plain face on the end.

anyway, they fitted directly into the pair of rockers i have in my engine all nice and tight. alas i've been running the inlet and exhaust rocker from the BV head and the exhaust pads only just sits on the valves.

so i had infact bought the bearings to fit my old SV head rocker arm but the pin fell in the hole? press fit! more like a piss fit!

upon a call to my dealer he explained that the newer style rockers have a slightly smaller o/d of pin (have i got that the right way around). also that that smaller pin comes fitted from '03 onwards.

so i have 2 sets of older rockers coz the pin felll through all four!

i had no idea about this????? and pray tell who T.F. did?

i've also ordered new pads (x 4) anyone else had too?

regards

Taffy

JoeUSA · Nov 18, 2006

Taffy said:
i've just fitted some new cam follower bearings tonight. looking from the side, i couldn't see this 'ring' in the ends of each pin. so i called the dealer over this and he explained that that "hollow dowel with a pin inside" look was actually only the machine at the factory pressing them in to stay. so when i fit them there is only the plain face on the end.

anyway, they fitted directly into the pair of rockers i have in my engine all nice and tight. alas i've been running the inlet and exhaust rocker from the BV head and the exhaust pads only just sits on the valves.

so i had infact bought the bearings to fit my old SV head rocker arm but the pin fell in the hole? press fit! more like a piss fit!

upon a call to my dealer he explained that the newer style rockers have a slightly smaller o/d of pin (have i got that the right way around). also that that smaller pin comes fitted from '03 onwards.

so i have 2 sets of older rockers coz the pin felll through all four!

i had no idea about this????? and pray tell who T.F. did?

i've also ordered new pads (x 4) anyone else had too?

regards

Taffy

Hello Taffy,

The 03 cam follower bearing axles are smaller in diameter than the earlier models and will only fit in the 03 rocker arms.

Once positioned in the 03 arms, you need to center punch the face of each end of the axle 3-4 times, with the center of the punch approximately 0.015" inside the the outside diameter of the axle. This will wedge a small mount of the axle material against the arm and retain the axle from falling out.

Remember to lubricate the needle bearings before installing the axle.

Here is the factory notice on measuring the axial clearance between the bearing and the rocker arm "arms".

Regards,

Joe

Taffy · Nov 19, 2006

RE: Re: incorrect info

joe

that didn't open for me.

so lert me see if i've got this right.

the factory went to larger pins in '03 because the size of the rollers came down from 8.0mm to 7.6mm. have i got that right?

so what have we been doing to our '02s to get us out of jail? it's called a mod but the only way you can fit smaller rollers in the old rockers is to have the smaller rollers on the same pins but in a smaller follower 'wheel'?

talk me through this one joe as i'm obviously thick!

regards

Taffy

JoeUSA · Nov 19, 2006

Re: RE: Re: incorrect info

Taffy said:
joe

that didn't open for me.

so lert me see if i've got this right.

the factory went to larger pins in '03 because the size of the rollers came down from 8.0mm to 7.6mm. have i got that right?

so what have we been doing to our '02s to get us out of jail? it's called a mod but the only way you can fit smaller rollers in the old rockers is to have the smaller rollers on the same pins but in a smaller follower 'wheel'?

talk me through this one joe as i'm obviously thick!

regards

Taffy

Taffy,

You need to get the Adobe Acrobat Reader to open the PDF file, free at www.adobe.com.

No you have it wrong. The factory changed the rocker rollers in 2003 to be the same as the KTM RFS. The 2003 roller needles are slightly larger in diameter than the 1989-2002 Husaberg needles. In order to use the same roller outside diameter (the surface that rides on the cam lobe) this required a smaller diameter roller axle. The 03 rocker arms have smaller holes drilled in them to fit the smaller roller axle.

You cannot back fit the 03 roller axle to the 89-02 rocker arms.

This means you either replace the worn out rollers on your 02 arms with new 89-02 rollers or buy new 03 rocker arms that come fully assembled with the rollers and valve adjustment screws and locking nuts.

If you look at the inside face of your 02 rocker arms you will probably find some severe scoring from the ends of the roller needles. This is bad and cannot be cleaned up . You should just replace the arms with new 03 arms.

Remember to drill splash oil lubrication holes in the 03 rocker arms just like the ones in your 02 .

Regards,

Joe

LINEAWEAVER · Nov 19, 2006

Regarding post 2002 Rocker Arms:

Smaller axle OD / smaller rocker bore ID.
Slip to very light press fit.

Personally:
I ground a hardened shaft to distort the axle in a press while backing up the opposite end. Such provides the "sleeve like" appearance of the post 2002 OE Rocker Arm axles.

Upsetting the axle end via Joe's advice is also sound.

Dale

Taffy · Nov 19, 2006

RE: Re: RE: Re: incorrect info

thanks for the clarification joe. a nightmare. now i gotta go and change the doc quick.i had no idea about the side play. HTF have i missed that? i thought it was all about the needle rollers not being up to it. with the later cam though i think it's easier for the followers. my LX1 was starting to show signs of the follower dragging. and that's with the newer design in there.

regards

Taffy

LINEAWEAVER · Nov 19, 2006

Hi Taffy,
For What it may be worth:
I have on rare occasion surfaced the ID flats of the rocker arm to eliminate the needle roller wear ring. Such @ best will get you through another bearing change prior to replacing the rocker arms.

Hope this helps.

Sincerely,
Dale

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