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GFR rear shock and linkage bushes/bearings 5 years 6 months ago #4879

  • 72degrees
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I've finally got round to having a look at the MoT advisories that GFR#1 (the high mileage one) got last time (two years ago).

One was "slight play in rear suspension bush". I'll get the shock out and check/grease the needle roller and spherical bush linkage bearings, but there is no part number for the shock top mounting bush. It's a typical rubber/metal bonded or silent block type. Anyone know if it can be replaced?

If not I may have to treat it to a complete new shock unit:

www.carpimoto.it/en-GB/Suspensions-Wheel...ra-GFR-125-93-02.htm
"Do not adjust your mind, there is a fault in the reality"
1957 175 Sport

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Last edit: by 72degrees.

Re: GFR rear shock and linkage bushes/bearings 5 years 6 months ago #4880

  • overbomber
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Ouch! That's a lot of beans.

Nothing suitable from something else that could be a straight swop or modified slightly?

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Re: GFR rear shock and linkage bushes/bearings 5 years 6 months ago #4881

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I haven't got the existing shock off yet, so the bush may not be the problem. It's not very bad, but I thought the whole set up could do with a bit of TLC after 40000 Kms and 22 years.

That whizzo unit has got rebound adjustment to be fair. My best bet is to take it in to John Gaskell at Revs suspension and see if he can sort it or find a replacement. He sells Wilbers shocks but I suspect they won't list one for a GFR.

At least, so far, it's all coming apart fairly easily, though I'm glad I've built up a good armoury of tools over the years. Had to resort to a 1/4 drive 13mm surface drive socket, 1/4 drive swivel, 3/8 to 1/4 adapter, then a 1/2 to 3/8 and a breaker bar to shift the nut on the top shock bolt. All the linkage bolts are currently soaking in plusgas before I try to get it apart.
"Do not adjust your mind, there is a fault in the reality"
1957 175 Sport

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Re: GFR rear shock and linkage bushes/bearings 5 years 6 months ago #4883

  • Valdeziscoming
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Hi Pete,
According to the parts book the bush should come out, in the GFR parts book it does not show a part number but in the MX1 parts book it shows a part number of 318597 and is called a buffer. (in both the GFR and MX1 parts list the shock assy is the same part number of 343606) It might be worth checking with Uncle Bob to see if he has that part number in his massive parts store somewhere.
In fact I'll see him later this week so I'll ask him and let you know.

I bought one these Bitubo shocks for my track Crono recently from Zion Motorsport in Derby for £211.12 including the VAT! The Part number is GLOO7WZE01 as specified on the Bitubo website for a Crono, it's wrong though, it has the wrong lower fitting and won't go in. As the shock from Gilera seems to be common from MX1 upto GFR I'll pass this info onto them as they are still working on it, maybe they need to give me the GL013WZE01.

Leigh

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Re: GFR rear shock and linkage bushes/bearings 5 years 6 months ago #4884

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After a bit of a struggle the shock is out and the bush/buffer seems OK. As I expected, after refurbishing a few old MX bikes with linkage suspension, the problem is the needle roller bearings in the dog bones. The spherical bearings aren't too bad but you could ask him if he has part numbers 324080 and 316696. I probably ought to replace the bushes and oil seals in the linkage whilst I'm at it also - 322267 and 322265.

At least the needle rollers and spherical bearings might be standard items I can match. The oil seals can be measured and matched but the bushes are going to be a pain if they really need replacing. Might just do the needle rollers and slap it all back together with lots of thick grease.

Luckily the swing arm bearings seem OK. I never realised there was a grease nipple !
"Do not adjust your mind, there is a fault in the reality"
1957 175 Sport

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Re: GFR rear shock and linkage bushes/bearings 5 years 6 months ago #4887

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Well, it's all apart and will definitely need new needle roller bearings and the sleeves for the dog bones. The bush in the linkage is very rusty but doesn't seem to have any play. Just as well as I suspect it would be a whotsit to get out without a hydraulic press.

Time to phone Uncle Bob and see just what he can supply.

Now for a sanity check. I had the usual struggle getting the rear 'axle' nut off (the one that has a split pin). Last had it off ten years ago to change the sprocket but I thought I ought to give the bearing in the eccentric carrier a check. It took much plusgas, the fire wrench, a rattle gun and then breaker bar. It went with a crack but luckily just the rust giving way. Freed up the not very movable eccentric, but the axle won't come out of the bearing. Fortunately the bearing seems OK, but a plusgas soak and tentative tap isn't shifting it. Am I missing something or is it just rusted in? Probably best to leave it be I think as the bearing spins smoothly with no play.

The rear brake pads are very won as the advisory noted, particularly one of them. The good news is I seem to have got both pistons moving again OK. Just bas well, as once again no part number for just the pistons but there is one for a 'rubber set'.

What fun :S Still I can have a break from old Gilera fettling for a bit as the KTM250EXC is now back to road legal endure trim (from hill climb/supermoto) and I'm going to try and get it an MoT.
"Do not adjust your mind, there is a fault in the reality"
1957 175 Sport

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