YZF750 vs YZF750R forks - Whats the difference?

[R6_kid:Me]

From what I can tell the R model forks were an upgraded Showa item.

My question is, if I'm going to spend some money getting the internals replaced with modern valving and springs anyway, will it make much of a difference if I start with the R model forks or stock forks? The current price difference is around $300-400USD between the standard forks and the R model forks.

Does anyone have a set of either? Would be good to know if they are both fully adjustable or not.

They will be getting fitted to my TRX850 which already has an ohlins rear shock.

[Sable]

I would imagine R will have exterior controls for setup like preload and damping, normal may just have preload.

[SPman]

The YZF750R was the standard model - normally just called a YZF750. The first SP had slightly uprated forks over the R, but then they became the same. Now, an FZR750R.............

[avgas]

The YZF750R was the standard model - normally just called a YZF750. The first SP had slightly uprated forks over the R, but then they became the same. Now, an FZR750R.............

......had exup........

[avgas]

R6 cant you fit R6 or R1 forks?
While I didn't find the YZF forks bad, they weren't that tall from recall. Also why not put some fancy kit in your TRX ones?

[R6_kid:Me]

R6 cant you fit R6 or R1 forks?
While I didn't find the YZF forks bad, they weren't that tall from recall. Also why not put some fancy kit in your TRX ones?

The YZF are 'period' and only require you to change the stem to the TRX one to fit them up. They also have the right bolt spacing for the aftermarket calipers that I've got.

I want the USD's for the look, but also I'm 99% sure they are properly adjustable, whereas the stock TRX forks have minimal adjustment, but other than that, mine are fucked.

[imdying]

Period be damned, I'd be checking with Robert before forking () out. It would suck to later find out that the R1 ones have twice the performance for only a few bucks more. Early R1 forks aren't exactly modern looking either, although admittedly those brake calipers with the anodized plugs are dreadful looking

[F5 Dave]

Early R1s had an odd arrangement with long top out springs etc. Didn't really work quite as they should.

YZF ones are a bit queer inside but can be made to work well. But no amount of twiddling with clickers will do it. I had Mark Patterson from Patterson & Connor fit do mine back in the day by fitting piston kits (not particularly cheap). + the totally required uprated springs. Std they come with maybe .8s, but probably lower if measured & need .85 or .9s, maybe more if raced or fat bastard.

Blue spot callipers are lighter than the 6 potters (0.5kg per side & work heaps better, but need 14mm MC too), but TRX should have Brembos on most models.

Latter model USDs (R1 etc etc) will negate speedo drive doofer that TRX or YZF will use as they take off gearbox sprocket. Course you could always fit an R1 speedo & make up a bracket to fit a hall effect sensor from the front sprocket. I see someone has an R1 dash on TM at the mo. And might have the sensor as well. I have an article somewhere.

[SPman]

......had exup........

...was the OW1

[avgas]

...was the OW1

From recall that was an expensive waste of time.
Couldn't you get FZR750R that was not OW1 also????? Hmmmmm mabey your right. I recall the 400 and 600 you could get SP and non SP.

[george formby]

From what I can tell the R model forks were an upgraded Showa item.

My question is, if I'm going to spend some money getting the internals replaced with modern valving and springs anyway, will it make much of a difference if I start with the R model forks or stock forks? The current price difference is around $300-400USD between the standard forks and the R model forks.

Does anyone have a set of either? Would be good to know if they are both fully adjustable or not.

They will be getting fitted to my TRX850 which already has an ohlins rear shock.

I don't know sweet fa about the forks but your bike sounds like fun, just my cup of tea.

[SPman]

TRX 850s ARE fun.
They just don't have ludicrous amounts of power, are getting older now, so are often overlooked....

[Robert Taylor]

Irrespective of R or OW01 etc the cartridges need work. The OW01 was just a platform to start with anyway because to go racing in WSBK etc you chucked away the shock and forks and put thoroughbred racing stuff in it

[R6_kid:Me]

I don't know sweet fa about the forks but your bike sounds like fun, just my cup of tea.

Mine is far from standard. Keihin FCR41's, Wossner High Compression Pistons, OVER Racing full system (now has Yoshi end can), Ohlins rear shock, OVER Racing CDI, OVER rearsets, a few aftermarket billet pieces to lighten it up, the forks are the only part other than the rider that is letting it down at the moment.

TRX 850s ARE fun.
They just don't have ludicrous amounts of power, are getting older now, so are often overlooked....

With the engine work mentioned above I should be at or around 100hp/90+Nm. Once for the forks are sorted it'll be brilliant!

Early R1s had an odd arrangement with long top out springs etc. Didn't really work quite as they should.

YZF ones are a bit queer inside but can be made to work well. But no amount of twiddling with clickers will do it. I had Mark Patterson from Patterson & Connor fit do mine back in the day by fitting piston kits (not particularly cheap). + the totally required uprated springs. Std they come with maybe .8s, but probably lower if measured & need .85 or .9s, maybe more if raced or fat bastard.

Blue spot callipers are lighter than the 6 potters (0.5kg per side & work heaps better, but need 14mm MC too), but TRX should have Brembos on most models.

Latter model USDs (R1 etc etc) will negate speedo drive doofer that TRX or YZF will use as they take off gearbox sprocket. Course you could always fit an R1 speedo & make up a bracket to fit a hall effect sensor from the front sprocket. I see someone has an R1 dash on TM at the mo. And might have the sensor as well. I have an article somewhere.

Losing the speedo drive was my other consideration, I quite like analogue gauges. That said, I'm looking for late model R6 or possibly aftermarket wheels anyway so might have to work something out. Apparently the early R1 forks "work better" with the TRX than they do with the R1...

Period be damned, I'd be checking with Robert before forking () out. It would suck to later find out that the R1 ones have twice the performance for only a few bucks more. Early R1 forks aren't exactly modern looking either, although admittedly those brake calipers with the anodized plugs are dreadful looking

I've got AP Racing 4 pots with a matching master cylinder, plenty of braking power and look pretty sweet too!

[HenryDorsetCase]

I just got the December Performance Bikes and it has a couple of TRX850 specials in it.

One has a Reynolds 531 frame (oooh errr) and Ohlins forks, the other has modified GSXR750 forks.

I can scan and email you the feature if you want to read it. If I do it from work it will even be in colour. They are definitely sexy well sorted bikes (his and hers, husband and wife).