Retro/M70/Marzocchi fork oil capacity. ( Copied from General Hamm...)

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47ohv
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Re: Retro/M70/Marzocchi fork oil capacity. ( Copied from General Hamm...)

Post by 47ohv » Wed May 15, 2019 2:19 pm

Yes, the amount of time is short. Heck, diesel fuel would work also. But to be on the sare side just a thin wt oil like 0-20wt would be good. Just ordered a qt 20wt from JP cycles

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jaybird
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Re: Retro/M70/Marzocchi fork oil capacity. ( Copied from General Hamm...)

Post by jaybird » Fri Jul 26, 2019 12:03 am

A couple of thoughts on draining the fork oil through the retainer bolts on the bottom.
As tempting as it is to do so, I'm not sure you'll get a thorough evacuation of the oil, draining it in that way. I suppose you could keep pouring fresh oil in the top and cycling the fork to pump it through, but how can you be sure you're not going to be overfilling it?
Rather than service the fork oil at the intervals suggested in the book, I decided to do the work in conjunction with a front tire change. Once I had the wheel off, it wasn't that much more work to remove the fork legs.

Happy trails,
Jaybird
2005 Gear-Up, Mr. Nat_ural 108,000+ Kilometers and counting
2013 Retro, Black beauty, AKA Lucky "13"
1995 Olive Tourist
1975 Enfield Diesel Bullet
2008 Enfield Bullet 500
1974 BMW R 75/6
Etc.

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VWK75S
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Re: Retro/M70/Marzocchi fork oil capacity. ( Copied from General Hamm...)

Post by VWK75S » Fri Jul 26, 2019 7:39 am

I haven't changed the oil in Retro forks but I'm going to use less oil because the back roads in Maine are :shock:
The ride's too rough.
Hope the guts aren't like the K-Bike (21 parts in left and 14 in the right) :?
fork.jpg
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The Ural's made Maine a much bigger state.

2009 GearUp 145,000kms
2007 Retro 25,000kms
1991 VWK75S 110,000miles

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jaybird
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Re: Retro/M70/Marzocchi fork oil capacity. ( Copied from General Hamm...)

Post by jaybird » Thu Aug 01, 2019 7:55 pm

VWK75S wrote:
Fri Jul 26, 2019 7:39 am
I haven't changed the oil in Retro forks but I'm going to use less oil because the back roads in Maine are :shock:
The ride's too rough.
Hope the guts aren't like the K-Bike (21 parts in left and 14 in the right) :?
fork.jpg
Hey John. The heavier oil does give a firmer ride with less diving. I think putting less oil than called for might damage the damping mechanism. If I were looking for a softer ride I might try a lighter weight oil, just be prepared for extra diving when braking.
Unless you’re doing a complete rebuild, you don’t need to take the fork legs apart, just dump/drain them.
I don’t think they have as many parts as K bike forks, they’re very basic.
Let us know what you do and how it works.

Happy trails,
Jaybird
2005 Gear-Up, Mr. Nat_ural 108,000+ Kilometers and counting
2013 Retro, Black beauty, AKA Lucky "13"
1995 Olive Tourist
1975 Enfield Diesel Bullet
2008 Enfield Bullet 500
1974 BMW R 75/6
Etc.

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VWK75S
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Re: Retro/M70/Marzocchi fork oil capacity. ( Copied from General Hamm...)

Post by VWK75S » Fri Aug 02, 2019 6:09 am

jaybird wrote:
Thu Aug 01, 2019 7:55 pm
I think putting less oil than called for might damage the damping mechanism. Happy trails,
Jaybird
Thanks for the info, guess I need to do some research, I made that assumption based on K-bike knowledge (different levels based on if your riding a K, C or S model).
John
The Ural's made Maine a much bigger state.

2009 GearUp 145,000kms
2007 Retro 25,000kms
1991 VWK75S 110,000miles

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