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Post Info TOPIC: 05 YZF250 USD front end meets TTR...


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05 YZF250 USD front end meets TTR...
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This has to be the easiest USD upgrade you could find.... A straight bolt-in fit only took me 4 hours included stripping the TTR front end out of the bike....

 

The only mod you have to do "if yer could call it a mod".

The bottom nut is from the TTR & is now used as a spacer... 5 mins to file the thread out so it slides over the steering stem..

the taper on the stem is just starting to enter the bearing so still more than enough bearing surface in the bearing...

 

No mod was required to the steering stops....

 

What I hadn't noticed was the YZF front end has a over-size aftermarket rotor & caliper bracket.... still need to get brake pads & caliper rebuild kit as well as some new fork protectors...

old ones that came with the front end just won't clean up....

 

Throttle & clutch cables are a bit on the tight side now... lucky I got some longer cables off Brian a couple years ago..

I can use the front brake line but, to route it where Yamaha intended, I will need a longer one.....

bearings... bottom is the YZF250 bearing ... the top is the TTR bearing...

just need to change tyre from the TTR wheel...



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Excellent post Pete - thanks for documenting and sharing biggrin

Brian



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Top job. Much easier than my WP swap. I had to get bearings milled down.
How are the forks for length compared to the old ones. I have some bar raisers and managed to pull the fork legs up through the clamps a fair bit to get ride height right.
Gonna get them revalved??

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Nice worksmile



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Good work. Let us know how it rides compared to stock

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Good work Pete. Love it when a plan comes together!
Could you weigh the ttr bits before you dispose of them please. (Sorry, I really should get out more!)
I forsee a yzf bidding war on ebay...

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The YZF forks are 10mm longer.... top to axle centre.
Axle offset is 5mm less than the TTR so slightly more trail...

should make the bike  track straighter & be more stable in a straight line...


I thought the YZF front end was going to be heavier than the TTR but the bike now has 2.5/3kgs less front weight..

even the TTR mudguard bolted straight on...

this has to be the easiest USD swap yer could find..

 

looking at bearing sizes the YZF & WR forks from 2001 to 2006

or forks that use 28/52/16 or 30/52/16 size bearing will fit..

or any bearing with a 52mm OD to fit the steering head...

and a stem of around 240mm from top of the bottom clamp to the top of the stem.....



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Kaos wrote:

Great Job.
Now we are waiting for the ride report.


 rained all last week end.... so done nothing on it...

sheds to small or could be two meany bikes in it .

Didn't want to put any in the rain to make working room..

but I got the front caliper rebuilt... seals & new pistons..

So its put it on , bleed it then the longer cables , change

the tyre....

 

 

 

.



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O yer and a Quad...



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Excuses excuses. Get a bigger shed! (Or wheel it into the kitchen!)

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HaHa... One bikes already inside...

The Montesa 125 H6 lives in the lounge...

(think I need to stop working on bikes & get the lounge finished)

 



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biggrinbiggrinbiggrinbiggrin

No smell of petrol in the lounge?  confuseconfuseconfuse



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See what you have done Simon, you will be in trouble with Pete's other halfwinkwinkwink



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At least they can share the sofa and both have something good to watch when the tv programme's not to Pete's taste! Just trying to think if I've seen that film with Jeremy Renner and Kevin Bacon working in a tyre bay??

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ttr steve wrote:

See what you have done Simon, you will be in trouble with Pete's other halfwinkwinkwink


 no other half now...

thats how I get away with it...

 

 

 

 

...

 



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O yer and a Quad...



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I found this photo showing dimensions of the TTR's bottom yoke. Might be useful for someone.

 TTR yoke post dimensions.jpg



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petenz wrote:
ttr steve wrote:

See what you have done Simon, you will be in trouble with Pete's other halfwinkwinkwink


 no other half now...

thats how I get away with it...

 

 

 

 

...

 


Ooops

Sorry Pete

If I put my size 11 in it againnonono 



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ttr steve wrote:
petenz wrote:
ttr steve wrote:

See what you have done Simon, you will be in trouble with Pete's other halfwinkwinkwink


 no other half now...

thats how I get away with it...

 

 

 

 

...

 


Ooops

Sorry Pete

If I put my size 11 in it againnonono 


 lol.... don't be sorry....

i'm shaw as hell arn't....

 

 

..



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Bikes... 06 TTR250 / 09 XT660R / 1977 Montesa Cota 348 MRR / 1979 Montesa H6 125 Enduro...

O yer and a Quad...



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How different are the hubs Pete? Would a YZ wheel fit a TTR or vice versa with the correct bearings and spacers, or is the brake rotor in totally the wrong place/wrong size?

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i would have to look... will on the week end when i change the tire...



..

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O yer and a Quad...



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No rush, just while the opportunity is there to compare them it would be interesting.
I'm keeping my eyes on ebay

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little bit more info on the front end..
just changed the oil ...YZF front end takes 662cc of oil or the oil level is 125mm...

put both the rebound & compression damping clickers to there middle setting for a start point..


Still waiting on the brake hose , It needs a 1600mm to route it where Yamaha intended...

brake calipers rebuilt new seals & pistons..cost $70NZ...

Havn't riden it in anger yet... Have a ride this sunday....


.



-- Edited by petenz on Tuesday 2nd of May 2017 12:53:10 AM

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O yer and a Quad...



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I have done the same upgrade on my bike, super easy. The hardest part is sourcing the forks!

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Man, thats an awesome project!  any updates since last post on the bikes new characteristics?  now you have me scouring ebay for forks instead of rebuilding the TTR units... lol  also any picture updates with the bikes completely put together with the new front end, I bet it looks BOSS!

 

Chris



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I had the first real ride on it last week end...

The front ends needs a bit of work...

way over sprung for my weight...  they come standard with

.43kg/mm springs that suit a 75-85kg rider i'm about 77kgs

so they should have been about right for me.... so i think

they have been replaced with stiffer ones or have pre-load spacers..

i will move the forks up though the clamps as it turns quite slow

to much rake at the moment....

at the moment the TTR front end was better....but that will change...



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Bikes... 06 TTR250 / 09 XT660R / 1977 Montesa Cota 348 MRR / 1979 Montesa H6 125 Enduro...

O yer and a Quad...



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G Ballard used to love the TTR forks & he would put TTR forks on WR's, well that's what I heard.

I don't mind the TTR forks but I guess I don't ride it that hard, not on the limit with jumps etc.

Terry

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