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Post by re5rotary on Jan 26, 2014 1:24:47 GMT -5
Hi has any one found a source of new fork stanchions? I can find GT750 ones but not RE5. I guess the demand is low but you never know. Mine have a few pits but not in the seal area so they are OK for now but Im just thinking ahead. regards terry
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t140v
3rd Gear
Posts: 427
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Post by t140v on Jan 26, 2014 12:02:23 GMT -5
Evening Terry, the part number for fork inner from the parts manual is 51110-31230 the same part number is used in the "L" model GT750, I am considering overhauling the forks on mine next year and will be using these parts. There is a supplier in Japan doing reproductions for about £100 the pair. There were some mods to the later stanchions but I would imagine they are all about the same. If you want to have your originals checked over, straightened if bent and replated with hard chrome and you live in the UK then www.pittedforks.co.uk are a good reliable company, they arrange courier pick up and delivery and usually turn them round in just over a week. Regards Stuart |
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Post by re5rotary on Jan 28, 2014 3:50:52 GMT -5
Hi thanks silly me I have a J model GT750 and I knew they were different to that model. Didn't think about the later Gts! regards terry
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Post by timpa136 on Mar 9, 2014 16:41:00 GMT -5
You might check here. I have not used them but they have advertised for years. I would be interested if they can help you. Forking by Frank here. www.frankmain.com/Tim |
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Post by jm0406 on Mar 17, 2014 17:52:44 GMT -5
I have purchased from "forking by Frank" frank's Engineering for many projects. I find their tubes to be of above average quality with a hard chrome finish that holds up well. I have a set on 2 RE5 project bikes.
Jeff
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Post by re5rotary on Oct 15, 2016 3:42:09 GMT -5
Hi all reviving this thread of mine from a few years back. It seems the only fork tubes available are for a GT750M and later which use a circlip and plug to hold the fork spring in rather than the threaded cap that an RE uses. Funnily enough this matches with an L model GT750. Has anyone used the circlip type as a substitute? Im sure it will fit the lowers OK but the fork spring and even the outer fork tube has a different part number between L and M Gt750. Im probably going to buy a pair and measure and look for my self but I just thought I would ask in case anyone else had been through this exercise regards Terry
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Post by raychappo on Oct 15, 2016 7:26:46 GMT -5
My RE5 has the circlip type forks. I'm not sure if they were standard or have been replaced in the distant past. The caps are not the black plastic domes I've seen on GTs but ones that look like the screw in chrome type with a hex head but just push in and are basically retained by an o-ring.
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Post by re5rotary on Oct 18, 2016 3:42:34 GMT -5
Ok seems I have to answer my own question :-) In amongst some bits I picked up recently comprising most of another RE5 there were actually a set of these forks with the circlip type retainer at the top. So I stripped one of these and an RE5 fork leg and I can confirm internally they appear to be identical, same spring, damper rod, position of holes etc. So if you need a set of fork inners I believe you can use the later GT750 tubes, the only extra parts you will need is the cap under the circlip and the circlip itself regards Terry
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Post by wayne on Oct 18, 2016 3:52:10 GMT -5
I'm intrigued. I thought that all GT750's had a single spring in each fork stanchion and all RE5's had two ? According to the parts book, that's the case. Also the damper rod has a different part number. The forks certainly work very differently between my M RE5 and M GT using the same oil in prescribed quantity.
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Post by raychappo on Oct 18, 2016 5:53:04 GMT -5
My forks with the circlip tops have 2 springs in each leg
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Post by wayne on Oct 18, 2016 15:41:41 GMT -5
Maybe I've incorrectly assumed re5rotary meant one spring.
Terry, did your circlip fork have one or two springs per leg ?
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Post by pmcburney on Oct 18, 2016 16:21:14 GMT -5
The inners (RE5/GT750L) definitely have different part numbers - the RE5 inner is a 51110-312 30, and the GT750 inner is a 51110-312 03. I'd hazard a guess this is because the RE5 inner has to be longer than the GT to accommodate the extra spring. For reference, RE5 forks:  GT750L forks:  |
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Post by timpa136 on Oct 18, 2016 16:43:27 GMT -5
.......circlip type retainer at the top. So I stripped one of these and an RE5 fork leg and I can confirm internally they appear to be identical, same spring, damper rod, position of holes etc. Terry Terry, I would be interested if you could measure the external damper rod holes in comparison. Years ago a cycle magazine pictured the compression and dampening holes for an article but I don't recall which were the larger holes. As I recall from riding the two bikes back to back in the 70s the Gt was noticeably softer in comparison...... maybe just the springs???
Paul said I'd hazard a guess this is because the RE5 inner has to be longer than the GT to accommodate the extra spring.
I would think the combined springs length of the RE5 is very close to the GTs ?
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Post by pmcburney on Oct 18, 2016 17:04:09 GMT -5
Paul said I'd hazard a guess this is because the RE5 inner has to be longer than the GT to accommodate the extra spring.
I would think the combined springs length of the RE5 is very close to the GTs ?
Hmm... Yeah, I reckon the combined spring length is similar, with the RE5 just having different spring rates essentially, but I'm 99% sure there's a difference in length between the two inners. Of course, without a side-by-side comparison I can't be completely sure... Whether or not it matters is the more important point, and it probably doesn't. In fact, dropping the nose of the bike/shortening the steering angle slightly would sharpen the steering up a bit, but not to the detriment of stability given the original fairly conservative setup. As to the OP, there is a business here in Queensland called RAD hard chroming that straightens and re-hard chromes fork stanchions - I've had them do a set of GT750 stanchions and they're perfect, better than new I'd say, and it doesn't matter how bad they are to begin with, they can get even badly pitted, bent and damaged stanchions back from the dead... It would be possible (perhaps not cheap) to send them the stanchions to get them refurbished as opposed to sourcing new ones. |
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Post by timpa136 on Oct 18, 2016 19:40:47 GMT -5
Just picked up two drain screws that are now a black shiny screw instead if the silver finish. Fork straightening in the states there is
is franks engineering as posted by Jeff earlier in the thread. As to the OP, there is a business here in Queensland called RAD hard chroming that straightens and re-hard chromes fork stanchions - I've had them do a set of GT750 stanchions and they're perfect, better than new I'd say, and it doesn't matter how bad they are to begin with, they can get even badly pitted, bent and damaged stanchions back from the dead...
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