TRX Restoration Project

[Con Rod]

Main thing I'm looking for is a belly pan option that will fit the Akrapovic 2 into 1...

I will have a look and see if is is feasible for the belly pan, but I suspect it will be too large to work on the trx given it houses the 4 headers on the YZF.

[Yoozy]

What else can you use off that ?

Quite a few parts can be harvested with a little effort, obviously the wheels, front and rear ends can be swapped but also the carbs for example are the same, but there are 4 of them.

The rear brake master and calliper are also the same so I have swapped them over as mine were bit worse for wear

Loads of little parts like switches and locks are the same.

Rear sets are also the same.

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I thought their'd be loads of stuff. I'm looking to do the same thing, but all the YZF750's worth having are miles away from me. And believe me I've been looking for ages, their is one in Manchester but it looks pretty beat up

[alextrx850]

Probably already know, Paul, but the ignition lock FRAME BRACKET needs to be trimmed to allow the offset of the YZF top tripple ignition barrel...to turn to full lock.....otherwise..the ignition lock will whack the locking lug.
Will you be pressing out the stems yourself..?

[cobbadiggabuddyblooo]

Cheers Mate... mext question is What are your plans for the yzf gearbox???

[Con Rod]

Probably already know, Paul, but the ignition lock FRAME BRACKET needs to be trimmed to allow the offset of the YZF top tripple ignition barrel...to turn to full lock.....otherwise..the ignition lock will whack the locking lug.
Will you be pressing out the stems yourself..?

Thanks for the heads up Alex I did not know this. So it's the lug on the frame that the steering lock engages against? . Does it need to be removed or just trimmed back? From memory I think it protrudes about 10mm from the steering head as it is.

The stems got swapped today. A friend sorted it using a hydraulic press. He remarked that it took a lot if force to press the TRX one out and even more for the YZF750 one. He had previously done the same with a busa stem which required a fair bit less force.

A am planning to sell the engine complete cobba as it runs well

[Con Rod]

Ok so this project to swapped put the YZF750 wheels forks and swong arm on the TRX is progressing nicely.

The wheels are being painted tonight, and will be black with polished rims.

The swing-arm has been polished. I discovered much to my delight that a bath in a caustic soda solution takes the anodize layer off so just a rub with p1200 wet and a buff was needed after the batin caustic soda

Forks will just get new seals as the bushes are fine.

Now, question is

I am using the YZF swing and and wheel, and spacers etc. Do the sprockets line up? From what I gather from searched all I need to do is use the entire YZF sets up, wheel, spindle, spacers and calliper bracket and then just flip the TRX procket over. Is this correct?

[Con Rod]

its ok, I have confirmed that I just need to flip the sprocket over

[alextrx850]

R6 shock going in there Paul, ? ...or OL YELLA
An r6 is going to need the top of the swing reinforcer trimmed or it will bang the R6 reservoir housing.
You're getting there well though
Photos would be good !

[Con Rod]

R6 shock going in there Paul, ? ...or OL YELLA
An r6 is going to need the top of the swing reinforcer trimmed or it will bang the R6 reservoir housing.
You're getting there well though
Photos would be good !

Hi Alex,

Previous posts you have made on the forum have been very helpful for this project.

R6 shock is going in, I have cut out part of the plate on the swing arm to accommodate it.

I am almost ready to fit the front an rear to the trx, I just have the following left to do:

1. finish polishing the top tripple, (lower already done)
2. Fit a new bearing to the lower tripple
3. get tyres fitted to the wheels
4. trim the steering lock lug on the trx frame
5. Get a chain
6. Replace the seals in the YZF forks

Hope to get it all done this weekend

I almost have all the parts ready to go so I will take some pictures and do a bit of a write up of the work

[Yoozy]

Picking up a lovely Yzf750 today, shame to saw it up really but needs must so I'm looking forward to what you did mate

[alextrx850]

Picking up a lovely Yzf750 today, shame to saw it up really but needs must so I'm looking forward to what you did mate

Wow, for a Prillia nut ,Nob...you are stepping out of your torque curve.
I'd have thought you,d go Aprilia front and back...or maybe Scottish thriftiness..?
Photos ?

[Yoozy]

Picking up a lovely Yzf750 today, shame to saw it up really but needs must so I'm looking forward to what you did mate

Wow, for a Prillia nut ,Nob...you are stepping out of your torque curve.
I'd have thought you,d go Aprilia front and back...or maybe Scottish thriftiness..?
Photos ?

I am a little out of my comfort zone with Yams. Everything you get on Aprilia is top quality, and the banana swinger looks ace on the Trx. Any 1000cc Ape forks would be a mega improvement, even the Showa but I'm treading lightly, for a fat bas anyway, and going a tried and proved, pretty nob proof way of improving the handling and looks. Edit, I'm just lazy Nahh, I can't make stuff like some of you lads so pretty much bolt on stuff is best for now

BTW, I ain't no Nesbitt

[Con Rod]

ok, job done.

A mate with access to a press was good enough to help out with some significant parts of the job. He got the stem pressed out of the YZF750 triple and a TRX stem put in and did some repairs and paint on the mudguard and painted the wheels.

So, the TRX how has new forks, wheels, tyres, brakes, mudguard, swing-arm and so on. Basically with the exception of the frame itself, the bike has a new chassis. Using the entire YZF750 front an rear end, including wheels and brakes made things easier than trying to mix and match.

It was a reasonably big job. First off the parts required had to come off the YZF750, which was straightforward enough.

The wheels were stripped of paint and polished and then painted black in the middles.

Swingarm got a bath in caustic soda to lift off the anodised layer and then was sanded back and polished. Some minor modification was required so as I could fit the shock from a Yamaha R6.



I polished the upper and lower triples and the clip ons. A new lower race went onto the bottom triple.



Most of the other work was just a case of cleaning up various bits and bobs like the brakes and brackets before fitting.

Then the TRX was stripped down and hung from the garage rafters to remove the old forks wheels and swing-arm and put the new swing am in. A mate came over Thursday and helped out with this.

Friday morning I got new tyres fitted to the YZF750 rims and got to work transplanting all of the bits onto the TRX. Took pretty much the whole day to do it but pleased to say job done.















EDIT, information below added, copied from other thread in order to keep information together


If you have gone with a complete front and rear conversion to the YZF forks, swingarm and wheels you will have a 120 front and a 180 rear, so you have a difference of 60mm (or 30mm either side) between the front tyre against the rear.

Therefore you are aiming for an alignment measurement of 30mm on either side of the front tyre. That is, a straight line from the rear wheel tyre wall, exactly parallel to the bike will be 30mm from the tyre wall on the front.

If you just put the complete YZF rear end on, (swing arm and rear wheel) and measure the alignment you will get a gap of 39mm on the left and 21mm on the right

By removing the 4mm spacer from the right of the swingarm pivot and adding it to the left I have moved the swing arm 4mm to the right.

You will now have a gap of 35mm on the left and 25mm on the right (from 39 / 21 previously).

But the front and rear wheel will still be 5mm out of alignment.

To address this you can now move the wheel 5mm to the right.

This can be done, as I did by shaving 5mm off of the rear calliper bracket and adding a 5mm spacer on the left.

This is good as it will bring the wheels into alignment without causing any clearance issues with the shock linkages, pipes and hangers.

It will mean the chain wont sit right on the guide again. This can be addressed by adjusting the guide or sprockets.

But more important than having the chain alignment spot on is having the wheel alignment correct.

I have done the above and in the interest of addressing queries here I have posted some pictures below.

the method I used to measure my alignment is here

http://www.framestraightsystem.com/Moto ... 0Check.htm


Right side










Left Side










string is about 1.2mm

[alextrx850]

First impressions..?

[Con Rod]

First impressions..?

Well I went for a ride last night and a bit of a spin this morning. Nothing serious, but familiar corners that I know unsettle the TRX.

My first impression?

Spectacular improvement. Completely transforms the TRX. It now has a chassis worthy of the motor. Would you agree?

I am heading up north of Sydney next weekend. Planning to do the Putty, Bucketts Way, Thunderbolts, the Oxley Highway, Waterfall Way and the Gwydir so I will be able to test it in anger so to speak. Cant farkin wait!!!!