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Old 07-12-2011, 08:38 AM   #76
Airhead Wrangler
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It's basically the same as the 50mm except they don't come with the spacer. You have to make one. Almost all of the KTM models use the 4860 forks with the same internals parts, just different valving and springs. The adventure 950/990 models have 3.5" less travel because of a 3.5 inch spacer fitted on the damper rod causing the fork to top out sooner than it otherwise would. The springs are also shorter by 3.5"
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R80ST Gets The HPN Treatment
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Current rides: HPN #834, '93 R100GSPD "red rocket", '73 R75/5 Toaster mongrel, '80 Ducati Pantah 500SL, '92 DR350, '67 Honda SS50, '80 Honda Chaly.
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Old 07-13-2011, 05:51 AM   #77
igormortis
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OK, I’m looking for a helpful, scrupulous person, knowledgeable about these things, who can look at a link to some 4860s (I think), and give me advice on whether they’re likely to be a good candidate for this conversion. And then not buy the forks if they don’t already have their own.

Any takers?
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Old 07-13-2011, 06:44 AM   #78
Airhead Wrangler
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Quote:
Originally Posted by igormortis View Post
Any takers?
I'm no expert, but I'll give it a go.
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R80ST Gets The HPN Treatment
Seattle to TDF on an airhead

Current rides: HPN #834, '93 R100GSPD "red rocket", '73 R75/5 Toaster mongrel, '80 Ducati Pantah 500SL, '92 DR350, '67 Honda SS50, '80 Honda Chaly.
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Old 07-13-2011, 08:47 AM   #79
Country Doc
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That Rooney frame is intriguing...

hmm...

dc
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Old 07-13-2011, 04:17 PM   #80
igormortis
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Originally Posted by Airhead Wrangler View Post
I'm no expert, but I'll give it a go.
Ah, dammit. Missed out! Thanks anyway AW.
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Old 07-15-2011, 09:51 AM   #81
HPMGuy
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Originally Posted by Airhead Wrangler View Post
Any chance of doing the 4860s as well with our current numbers since the top clamp is basically the same, just 4mm wider holes? I don't see this being a terribly high demand part and I'm frankly shocked that we have as many takers as we do.
I am fine with this, and the numbers for the 4860 group, but it seemed that there was still some indicision with regards to material etc., wanted to get that resolved first, and didn't want to make the 50mm group (who seem really solid and ready to go) wait for that. As for the question of machining these out of 7075, it is definately possible...but is it necessary? R-Dubb designed these around using 6061, so I think the change to 7075 is not necessary and will add a LOT of expense to the project. So the 4860 group needs to come to agreement regarding material and then we can proceed.

Quote:
Re the machining of the stem offer do we have to supply the stem or will hpn guy supply
I would be happy to supply the stems for those that do not have them, that way we aren't supporting the shipping companies more than necessary sending these things all over the country. As soon as we get a number of those interested, I will post a quote including the stem with modification and pressing into the triple.
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Old 07-15-2011, 10:28 AM   #82
Airhead Wrangler
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Originally Posted by HPMGuy View Post
I am fine with this, and the numbers for the 4860 group, but it seemed that there was still some indicision with regards to material etc., wanted to get that resolved first, and didn't want to make the 50mm group (who seem really solid and ready to go) wait for that. As for the question of machining these out of 7075, it is definately possible...but is it necessary? R-Dubb designed these around using 6061, so I think the change to 7075 is not necessary and will add a LOT of expense to the project. So the 4860 group needs to come to agreement regarding material and then we can proceed.
I'm OK with 6061. I was just presenting 7075 as a "why not?" kind of idea since it has much better mechanical properties with no real weight penalty, but if the price difference is huge, then I guess that's "why not."
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R80ST Gets The HPN Treatment
Seattle to TDF on an airhead

Current rides: HPN #834, '93 R100GSPD "red rocket", '73 R75/5 Toaster mongrel, '80 Ducati Pantah 500SL, '92 DR350, '67 Honda SS50, '80 Honda Chaly.
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Old 07-15-2011, 12:39 PM   #83
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OK great, lets stick with the 6061.

The lower triple on the 4860 will not require an additional material charge (as I previously thought.), it just squeaked in the same size mat. for the other types...good news. So the pricing will be the same as the 50mm at $350/pair plus $18 anodizing. I will get the ball rolling on these as well.
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Old 07-15-2011, 07:01 PM   #84
igormortis
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Excellent. Put me down for the stem also. Impressive service for you to source them yourself.
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Old 07-16-2011, 06:47 AM   #85
Country Doc
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That's awesome Guy - thanks for your work on this!

Just to update my status, I'm in for a 4860 set WITH the stem ready and pressed in.

dc
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Old 07-16-2011, 07:51 PM   #86
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Big thanks Guy,To confirm put me down for the 50 and stem pressed in
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Old 07-16-2011, 10:59 PM   #87
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I am not sure if I have missed it, but was there a price quoted or estimated for Guy to provide a stem and press it in?
Already having a stem here I need to do a little cost/benefit analysis or getting another one that is ready to go.

Cheers,
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Old 07-21-2011, 09:58 AM   #88
HPMGuy
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Quote:
was there a price quoted or estimated for Guy to provide a stem and press it in?
I am waiting to see how many are interested, and then will provide pricing. Ordering multiple stems should get a quantity discount and machining them all at the same time will make it cheaper for all.

The material is in!
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Old 07-21-2011, 10:14 AM   #89
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Originally Posted by HPMGuy View Post
The material is in!
Whoohooo!


Quote:
I am waiting to see how many are interested, and then will provide pricing. Ordering multiple stems should get a quantity discount and machining them all at the same time will make it cheaper for all.
Alright, sounds good.
I'll put myself down as officially interested.

Thanks,
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Old 07-22-2011, 04:11 AM   #90
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are we their yet
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