Topic: fork conversions

[Sixgunsrattlesnake]

looking into converting my front forks to a modern system. anyone done this? I was looking at a dual disc front end from a early model (80s-90s) crotch rocket. maybe a 92 cbr600 f2 set-up. Something I can use my triple trees and just swap in the fork tubes.

[sethdhawkins]

You would have a difficult time doing a fork swap in that manner. Stock fork tubes are 35mm, while the year CBR that you mention has 41mm fork tubes. You'd have to machine the trees to fit the new forks (if there's enough material for it), then figure out wheel spacing, brakes, etc. after the fact. IMHO, it's the wrong way to do such a thing.
I would look into swapping frontends (triples, stem, forks, wheels, brakes) off other bikes; the popular choice for the period being the goldwing. If you're looking at more modern motorcycle frontends realize that you'll be rolling the dice with the black art that encompasses trail and rake.

Search for "Front end swaps" or "modern front end." There's hours of threads to read on the matter.

Seth

[Lefthook]

You would have a difficult time doing a fork swap in that manner. Stock fork tubes are 35mm, while the year CBR that you mention has 41mm fork tubes. You'd have to machine the trees to fit the new forks (if there's enough material for it), then figure out wheel spacing, brakes, etc. after the fact. IMHO, it's the wrong way to do such a thing.
I would look into swapping frontends (triples, stem, forks, wheels, brakes) off other bikes; the popular choice for the period being the goldwing. If you're looking at more modern motorcycle frontends realize that you'll be rolling the dice with the black art that encompasses trail and rake.

Search for "Front end swaps" or "modern front end." There's hours of threads to read on the matter.

Seth

^this.

Get a fork conversion kit from AllBalls Racing.  I bolted a cbr1000rr front end up to my cb750 using their bearing kit:

http://www.allballsracing.com/index.php/forkconversion

[Powderman]

I just swapped CBR600f1 front end onto a CB400f frame. AllBalls racing has all you need as a bolt on kit. I did run into an issue with having to space the lower bearing race lower than the stock one or put it under the lower bearing to move the tree down to clear the lower steering tube.

[Sixgunsrattlesnake]

Ive used all balls before. I dont know why their conversion kit wasnt on my mind. See, thats why you guys are the best

[scottly]

Most of the later front ends have very small off-sets in the triples. This can cause the forks to bash into the gas tank at full steering lock. You can prevent the bashing by limiting the steering travel, but in my case it resulted in a bike with the turning radius of a school bus. It was a pain to even move the bike around the shop... 

[Lefthook]

Most of the later front ends have very small off-sets in the triples. This can cause the forks to bash into the gas tank at full steering lock. You can prevent the bashing by limiting the steering travel, but in my case it resulted in a bike with the turning radius of a school bus. It was a pain to even move the bike around the shop... 

LOL... duly noted.  I think we will be putting reliefs into the tank on my bike.

[mysta2]

All it took to get a '96 VFR front end on my '75 750F was to swap the stem. Pressed it out of the 750 trees myself and took the '75 neck along with the '96 trees to a shop and had them press it in. I think that cost me $11.

[PeWe]

Nice thread here about fork rebuild
http://forums.sohc4.net/index.php?topic=63784.0

[Powderman]

Nice thread here about fork rebuild
http://forums.sohc4.net/index.php?topic=63784.0

While it is educational his pricing on parts from 3 years ago would be hard to find today or would take a year to wait to get the deals he claimed. Even bent forks are bringing way more than a full set of forks like those for $10.