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Author Topic: Correct fork cylinder ?  (Read 208 times)

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Offline dalvipravin81

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Correct fork cylinder ?
« on: December 04, 2017, 10:56:03 AM »
Ok am in to the entire reassembly of cafe and mistakes i did earlier in my first attempt ... This is or may be one of them

I have got rd350 and rd400 fork bottoms and internals from USA to convert my drum bikes in go disc and first one was the cafe.

But I guess the mech just replaced the outer shell and kept the internals same and am doubting that also can be one of the cause of bad handling ...Even springs are from old bike

Now I opened my boxes and found what I got from the guy I got the form bottoms but am all lost ... I got 3 sets of internals and 2 are 350 and 1 is 400 ...

Attaching a picture from left 1st is my indian fork cylinder rest are from usa 2 3 are light weight and I have 2 sets like them so I can assume they are 350 ??and 4 5 are heavy ones   and I have only 1 set so they can be of 400 ?

Also there is a difference in fork caps long n short ... Any identification will help me to get the right internals back to where they are suppose to tihan keep using usa outer and indian internals

Pravin

Offline jrotten99

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Re: Correct fork cylinder ?
« Reply #1 on: December 04, 2017, 11:15:59 AM »
2 in center are rd350. Left caps look life rd350.

Offline desmodrew

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Re: Correct fork cylinder ?
« Reply #2 on: December 04, 2017, 11:56:26 AM »
  The light alloy ones are RD350.  The steel ones on the far right are not RD400.  Maybe XS650  :umm:  I have some RD350, RD400, & XS650 internals at my shed.  I can post pictures later so you can see the difference.  To be honest, your Indian RD internal damper is the more modern design, and the one I would stick with (if your inner fork tubes will work with the US disc brake lowers). 
   I would get Gold Valves, RaceTech springs, modify your damper rods (per RaceTech instructions) and be done (again on the condition your inner tubes will work with the US lowers).  Once the damper rods are modified for Gold Valves they are basically spacers for the valves to sit on top of. :twocents:
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Offline jspooner

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Re: Correct fork cylinder ?
« Reply #3 on: December 04, 2017, 01:03:26 PM »
As long as the Indian tubes are 34mm you should be able to use the Indian tubes and internals with the US 400 lowers. Whatever tubes you end up using just stick the internals that go with them to save on confusion. And yes like the others said, the light alloy rods are RD350 and the caps on the left should be RD350. The other caps look like RD400 maybe?
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Offline teazer

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Re: Correct fork cylinder ?
« Reply #4 on: December 04, 2017, 04:02:39 PM »
The steels are probably late model RD250/400F.  As someone already said, use the damper rods that go with the staunchions that you intend to use.  They will be the correct clearances for those legs. The bottoms are basically interchangeable but damper rods and fork tubes must match.

Offline dalvipravin81

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Re: Correct fork cylinder ?
« Reply #5 on: December 04, 2017, 09:14:58 PM »
Ok  as advised i should be sticking  to what I have as of now I.e. indian fork pipes and internals in to USA outer !!

And i will check the oil to be 140 ml( am 75kg ... )to be precise as advised in another thread ....Later look for racetek stuff as budget permits

Thanks !!
Pravin

Offline naveenreddy1899

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Re: Correct fork cylinder ?
« Reply #6 on: December 05, 2017, 02:43:59 AM »
i have picked up bottoms and pipes  from Tx500 when i had plans for dual disk   :lol:,, rd and tx share the same internal stuff is what i understood. got the pipes chopped off to the rd350's pipe length   
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Offline SUPERTUNE1

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Re: Correct fork cylinder ?
« Reply #7 on: December 06, 2017, 04:16:58 AM »
The guys have it right! Steal one on the left looks like what we got as the '79 Daytona 400F in a 35mm tube, the aluminum end rods are RD350 with 34mm tubes and the pair on the right are '76-78 400's.
The short aluminum caps were used on 350 and 400's with 34mm tubes. The US '79 used steal socket caps. I don't know what the longer aluminum caps are?
The steal '79 type are the most friendly ones for using gold valves, 350 rods and 400's need special adapter spacers or mods for the gold valves to work on the rods.
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Offline dalvipravin81

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Re: Correct fork cylinder ?
« Reply #8 on: December 07, 2017, 02:49:43 AM »
The guys have it right! Steal one on the left looks like what we got as the '79 Daytona 400F in a 35mm tube,

That means Indian RDs have 79 Daytona inner tubes  and i should stick to them as they are better in case I need to use Gold Valve  ?

Regards,
Pravin

Offline dvsrd

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Re: Correct fork cylinder ?
« Reply #9 on: December 07, 2017, 07:30:10 AM »
I agree that the pair of rods to the right look like around -77-78 XS650 items. The XS650 has around 150 mm fork travel, and the rods then need to be longer than for the 120-130 mm travel of an RD fork.