Blingin' YZF front end

Please share your secrets! What mods have you made to your TRX?

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idl1975
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Blingin' YZF front end

Post by idl1975 » Wed Feb 11, 2009 8:20 pm

New YZF750R front end applied. All supposedly '94, although I'm not sure those are actually YZF 6 pots. EBC contour race 320mm discs. 120/70 Sportec M1.

Front end is very much improved over the stock TRX forks, even though these are only '94 forks, and those brakes are fierce. I also like the riding position with the clip ons. Only issue is the steering lock doesn't engage anymore, but then one doesn't really rely on that anyway. Might get that wheel powdercoated next time the front tyre is changed, but I don't mind the white wheel.

I will be selling off the stock TRX stuff soon - if anyone needs anything, let me know before it goes on e-bay.

--> Stock fender, black
--> TRX front wheel - standard titanium colour
--> TRX front discs x 2 (still in good nick AFAIK)
--> TRX yokes
--> TRX forks - black legs, rebuilt to Yam spec about 3 months ago.
--> YZF750 bottom yolk, stem and head bearings (I had a spare).
--> YZF600R blue spot calipers


Pics! :D
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Tarwetijger
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Re: Blingin' YZF front end

Post by Tarwetijger » Wed Feb 11, 2009 8:30 pm

Looks good! 8)
Funny thing is I'm also building the YZF forks in my TRX as well. :D

The 6-pots look very YZF-ish to me, so why are you not sure? :?:

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idl1975
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Re: Blingin' YZF front end

Post by idl1975 » Wed Feb 11, 2009 9:32 pm

Tarwetijger wrote:Looks good! 8)
Funny thing is I'm also building the YZF forks in my TRX as well. :D

The 6-pots look very YZF-ish to me, so why are you not sure? :?:
Oh good - I just didn't remember them having that silver bar across the middle. I was probably thinking of the 6 pots from my GSX-R-750.
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Corners R Us
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Re: Blingin' YZF front end

Post by Corners R Us » Wed Feb 11, 2009 11:14 pm

Nice job. Looks stock until you look closer....always a good concept in my opinion for a modified ride. Personally I'd powdercoat the back wheel white to break up the blackness of the bike?

Out of interest what screen is that you have on your TRX? I'm after a flip screen as I've tried 'double trouble' ones and never been convinced that the wind blast is reduced as promised.

Be interested to hear how you get on with the EBC Contour discs (correct?) too. They seem keenly priced and a sensible upgrade without going to the more extreme costs of Galfers.

Corners

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idl1975
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Re: Blingin' YZF front end

Post by idl1975 » Thu Feb 12, 2009 8:09 am

Yeah, I might have two white wheels or just go with the original colour. I'd rather like to have frame and wheels powdercoated in a sort of titanium colour, but I ride the bike every day so won't be stripping it down in the near future! I like the dark forks a lot, although they are the primitive '94 models without all the adjustment.

That's just a bog standard dark smoke flip screen - it had rubber trim on the edge back in 1997, but I think it flew off at high speed and I never replaced it. Think it's a "nuvo", whatever that is when it's at home. It basically just raises the windblast a little higher in the air, which gives you a little more still air when tucked in if you're tall-ish like me. Unless you're a person of reduced stature, you still get the same windblast when sat up, it just moves upwards a bit. As far as looks are concerned, it makes the TRX with stock forks look a bit like a Divvy from the front 3/4, but a bit meaner from the rear 3/4 (which is the TRX's best angle anyway, IMO).

Those are the contour race items, so they will probably turn out to be highly inappropriate on the road. All I can say so far is that 6 pots + 320 discs = serious brake torque. They're sharper than the bluespots they replaced, which I put down to increasing the disc diameter, although if you ask EBC they say the alloy used for the disc is higher friction. Certainly I don't see any reason why they should be worse than fancy Galfer, Braking, etc. models. I weighed them and posted the weight to another thread on them - think it was 1400 grams each (320s, remember, not the stock TRX 300 (298?)mm items)? Don't know if the Galfers have a weight advantage.

Although I've just been tiptoeing through the ice and slush with my new front tyre, those forks really are a huge improvement on the TRX ones. Probably won't make it any faster round a track with me on it, but like the Ohlins shock, it will add an extra safety margin of wheel compliance if you screw up and go into a corner "hotter" than you intended. If I had to do it again, I'd go R1 though. Much lighter, esp. as you can use 4-pots, 298mm discs, lighter front wheel, shorter (lighter) forks, etc. The only problem is getting the spacer I believe you need for the triple clamps. No problem if you have lathe skillz I suppose.
Corners R Us wrote:Nice job. Looks stock until you look closer....always a good concept in my opinion for a modified ride. Personally I'd powdercoat the back wheel white to break up the blackness of the bike?

Out of interest what screen is that you have on your TRX? I'm after a flip screen as I've tried 'double trouble' ones and never been convinced that the wind blast is reduced as promised.

Be interested to hear how you get on with the EBC Contour discs (correct?) too. They seem keenly priced and a sensible upgrade without going to the more extreme costs of Galfers.

Corners
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Re: Blingin' YZF front end

Post by Kayla » Thu Feb 12, 2009 10:13 am

idl1975 wrote:Although I've just been tiptoeing through the ice and slush with my new front tyre, those forks really are a huge improvement on the TRX ones.
Why do you think that is? I'm curious as I'm still weighing up the pros and cons of T'cat vs YZF.
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Re: Blingin' YZF front end

Post by idl1975 » Thu Feb 12, 2009 10:29 am

Kayla wrote:
idl1975 wrote:Although I've just been tiptoeing through the ice and slush with my new front tyre, those forks really are a huge improvement on the TRX ones.
Why do you think that is? I'm curious as I'm still weighing up the pros and cons of T'cat vs YZF.
Better spring rate for the bike (obviously this is easy to change) gives better control under braking, better fast bump response over stutter bumps (less harsh) with better slow bump response (soft but controlled, deals with braking forces better). I never noticed any meaningful rebound issues with stock forks, probably because the stock shock would just jack down and stay there, so the forks were not really what you worried about.

I was quite happy with the Maxton setup on my forks - damping was better set up - but when they were rebuilt per Yamaha specs I remembered why I'd had them Maxton'd in the first place. The horror! :o

No idea if these YZF forks have been modified at all, but they're still better than the TRX ones. I'll have to wait to see if the increased unsprung weight makes turn-in substantially more difficult on track. The forks are flush with the top yoke at the moment.

As I said, if I had to do it from scratch I'd go with late model R1, but I reckon YZF600 + correct springs, racetech compression stack and set the air gap right will get you at least very close with much less mucking about and expense. You just don't get the bling effect of USDs, but I suppose that isn't very important.
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Re: Blingin' YZF front end

Post by Kayla » Thu Feb 12, 2009 11:01 am

idl1975 wrote:You just don't get the bling effect of USDs, but I suppose that isn't very important.
Nope :D

Thanks for replying. The YZF forks need re-sealing (ugh!) and I'd at least re-oil the T'cat forks as a matter of course anyway.
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Re: Blingin' YZF front end

Post by trixynut » Thu Feb 12, 2009 11:31 am

Mate,

Looks good!! This should have been standard fitment on the TRX.

On the standard TRX front wheel AND mudguard that you may be selling, can I have first shout on it pls?
PM me prices with and without discs. Don't need tyre.

Cheers,

Dave

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idl1975
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Re: Blingin' YZF front end

Post by idl1975 » Thu Feb 12, 2009 12:07 pm

Kayla wrote:
idl1975 wrote:You just don't get the bling effect of USDs, but I suppose that isn't very important.
Nope :D

Thanks for replying. The YZF forks need re-sealing (ugh!) and I'd at least re-oil the T'cat forks as a matter of course anyway.
No worries...

I actually have "NIB" oil and dust seals for the YZF if you want them. They don't seem to leak, so I won't need them immediately.

If you haven't bought all the bits for the YZF750, I suppose on balance I'd start with YZF600 forks. I just happened to find a YZF750 front end before I found a decent set of Blunderphat forks.
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Re: Blingin' YZF front end

Post by steve speed » Thu Feb 12, 2009 2:50 pm

the spacer that is needed for the R1 forks can be had for about £20
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Re: Blingin' YZF front end

Post by idl1975 » Thu Feb 12, 2009 2:53 pm

steve speed wrote:the spacer that is needed for the R1 forks can be had for about £20
Exactly, the only issue is finding someone to make it (unless you have a lathe) and knowing what size it should be...
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