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 1979 38mm KTM forks
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New Member

9 Posts

Posted - 03/29/2020 :  11:14:07 AM  Show Profile  Reply with Quote
Does anyone know how many cc's of oil in each leg?
Thank you guys
George B

Advanced Member

1265 Posts

Posted - 03/29/2020 :  11:20:20 AM  Show Profile  Reply with Quote
With the fork tubes compressed without the springs I fill the tubes 6 from the top. I then go ride to see how it feels for me, and adjust accordingly. I use ATF in all my bikes and like the response it gives me. Remember, you are the riders, so it has to feel good for you, not what is good for others.

1976 250 MC5 Original Owner
1976 Penton 175 XC
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New Member

9 Posts

Posted - 03/29/2020 :  11:35:14 AM  Show Profile  Reply with Quote
Thank you skiracer
There was a post 13yrs ago(!) from Rocket with a chart of all/most Penton/KTM fork capacities...
1979 mc80 250/400/420 Marzocchi 38mm 275mm travel
365/390cc 10wt

I would imagine(?) 365 is the min & 390 is the max
I am going to fill w/ 377cc 15wt without spgs & measure to top

George B

Edited by - GeorgeBressler on 03/29/2020 11:50:02 AM
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Advanced Member

2459 Posts

Posted - 03/29/2020 :  1:46:36 PM  Show Profile  Visit 454MRW's Homepage  Reply with Quote
The two different measurements are whether you actually disassemble the forks completely or whether you just drained them.

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
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Advanced Member

1274 Posts

Posted - 03/30/2020 :  11:13:27 AM  Show Profile  Reply with Quote
Here is a chart with fork oil capacities.

1979 MC80 250/400/420 Marzocchi 38mm 275mm 390cc 365cc 10wt
1979 MC80 125/175 Marzocchi 35mm 250mm 300cc 280cc 10wt
1979 MX6 250/400 Marzocchi 38mm 270mm 390cc 365cc 10wt
1979 MX6125/175 Marzocchi 35mm 250mm 300cc 280cc 10wt
1978 GS6 Ceriani Leading Axle 35mm 240mm 230cc 215cc 10wt
1978 MC5 Ceriani Leading Axle 35mm 265mm 270cc 250cc 10wt
1978MC5 250/400 Marzocchi 38mm 270mm 380cc 360cc 10wt
1978 MC 5 125/175 & All GS6 Marzocchi 35mm 250mm 280cc 265cc 10wt
1977 GS6 & MC5 Marzocchi 35mm 220mm 240cc 220cc 10wt
Late 1977 MC5 Marzocchi 35mm 240mm 265cc 250cc 10wt
1976 Cross Country or MC5 Ceriani Leading Axle 35mm 220mm 230cc 215cc 10wt
Marzocchi 35mm 220mm 240cc 220cc 10wt
1975 All Models Ceriani Straigh Leg 35mm 190mm 235cc 220cc 10wt
1972-1973 Ceriani 32mm 135cc 10wt

The bigger cc is for a total rebuild, the smaller cc is for a drain and refill.
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