Zoke dampening rods

[skiracer]

Does anyone have experience modifying the dampening rods on the Zoke forks from the mid 80's?

1976 250 MC5 Original Owner
1976 Penton 175 XC

[Richard]

Are you working with the piccolo tube damper rods?

[skiracer]

Yes I am.

quote:Originally posted by Richard

Are you working with the piccolo tube damper rods?

1976 250 MC5 Original Owner
1976 Penton 175 XC

[Larry Perkins]

There was a Tech Bulletin fron KTM on the 38mm.  Not sure If I know where mine is right now.  If you hit up Mike Lenz on Facebook I believe he may know.

Larry P

[DKWRACER]

From an old Cycle World article, hydraulic lock was noted in the M-zoke forks. Mentioned is drilling another hole 90 degrees .5 inches above the (same dia. as adjacent hole) compression hole,the one lowest on the damper rod, just above the hydraulic stop cone, noted also that Can-Ams had this mod done at the factory. Adios from Denver, Tom Brosius

[Richard]

I didn't know about a bulletin from KTM or the mod to the compression hole that Larry and Tom talked about. But I have modified 40 mm fork tube damper rods for Race Tech emulators. I have some data if you're interested.

[skiracer]

Thanks Tom, I did that mod many years ago!

quote:Originally posted by DKWRACER

From an old Cycle World article, hydraulic lock was noted in the M-zoke forks. Mentioned is drilling another hole 90 degrees .5 inches above the (same dia. as adjacent hole) compression hole,the one lowest on the damper rod, just above the hydraulic stop cone, noted also that Can-Ams had this mod done at the factory. Adios from Denver, Tom Brosius

1976 250 MC5 Original Owner
1976 Penton 175 XC

[454MRW]

I also have read the article about modifying the 1978 38mm damper rods with the additional holes because of arm pump and fatigue. On late 78 early 79 MX6 model KTM's they did it at the factory.

Michael R. Winter
I enjoy rebuilding and appreciating Pentons!
1974 250 HS Penton
1976 MC5 400
1978 KTM 78 GS6 250
L78-79 MX6 175-250 KTM's
1976-78 125-400 RM's
2007 CR125R Honda
1977 MC250 Maico
2017 KTM Freeride 250R