swapping forks

top-jelopy · May 12, 2019, 11:59:24 PM

I haver to replace my (stock )forks and was thinking I would upgrade , I'm looking any suggestions for replacements of bigger size . Not inverted though . Thanks in advance

Seizer · May 13, 2019, 12:14:31 AM

Easiest would probably be RZ350 forks. 35 vs 34mm tubes and you gain dual disc front brakes. Really, the sky's the limit on fork swaps. Just make sure the overall length is close or you'll have a bunch of tube above your upper triple. I saw a fork swap chart somewhere on the internet (DTT?) that had all the dimensions but can't recall where I saw it.

Dvsrd · May 13, 2019, 10:33:59 AM

FZR400/600 forks are 38mm, fairly lightweight, Racetech valves and springs are available. Popular upgrade for XS650s

m in sc · May 13, 2019, 10:47:31 AM

huge pain in the ass IMHO, and ive done a few. stock forks work well, use a mikes xs gold valve in stock forks, works fantastic and you dont have to figure out wheel spacing/gauge mounting/neck bearings.

pdxjim · May 13, 2019, 11:09:33 AM

Early R6 would be the logical choice, but then you have to figure out all the stuff Mark mentioned.

Only really makes sense if you're doing the rearend and wheels too.

top-jelopy · May 14, 2019, 10:15:22 PM

thanks for all of your advice , I think I will keep stock .

Seizer · May 14, 2019, 10:47:00 PM

I kept stock forks with Race Tech emulators and springs. It's the way to go imho.

top-jelopy · June 12, 2019, 11:19:53 PM

I have a question even though I've already gone down this road .... will rd400 wheels bolt straight onto the rz fork? still use one brake ?

DesmoDrew · June 13, 2019, 07:14:35 AM

Quote from: top-jelopy on June 12, 2019, 11:19:53 PM
I have a question even though I've already gone down this road .... will rd400 wheels bolt straight onto the rz fork? still use one brake ?

^ Nope.

And if you get the emulators for the stock forks (which work great) you need to also purchase 'straight wound' fork springs. Emulators do not work with 'progressive wound' springs.

top-jelopy · June 13, 2019, 08:47:27 AM

Ok thanks for that info

RdsOnly · June 13, 2019, 11:06:40 PM

Mark had the easy answer- stock forks, look up the part # stock on TZ250 and TZ350's back in the day.
Some differences damper, spring same tubes.

I have done kX 300 Upside down front end for RD, FJ600 duel disk, R6 upside down-pain in the ass.

Upside down forks: MY THOUGHTS
#1 loose turning range= slow speeds
#2 To rigid for Front of frame
#3 Much heaver front to heavy= flop
#4 TO stiff for short wheel base bike.

I have done them-as many on this forum have done. +/- stock is cheaper and works great when tuned.

JT

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swapping forks