My winter project

[Mincehead]

Best left alone if everythings running nice, no oil burning issues etc, but you could perhaps fit a new cam chain if you don`t know when she last had one.
TRX`s habitually stretch them and it`s not a bad job to do with a new D.I.D cam chain costing around 70 quid, new cam cover nitrile gasket at about 20 quid, oil pumps cover gasket and your time.

[scarfacehugo]

as they say "if it aint broke - dont fit it"

I think you answered your own question

[meensy]

Could you please tell me how you are running the speedo cable drive with the r1 forks? I think I have the same folks on my trx Cheers

[Mincehead]

I can tell you and it involves milling off the boss on the inside of the left R1 fork leg, using a Thunderace front wheel and spindle with speedo drive and carefully machining spacers to centre the wheel.
I`ve just fitted a Thunderace front wheel, spindle etc but because I didn`t want to modify the stock R1 forks I tried to machine the speedo drive to get it in. I thought I had it licked but there`s not enough material on the speedo boss and the little bu**ger fell apart.
The steel insert that the helical gear runs on is a press fit into the alloy speedo housing and removing enough material to get the wheel assembly in means it self destructs.
You could take `some` material off the inner left fork leg, leaving less to remove from the speedo drive but then you`ve not got the forks left stock if at a later date you find a cheaper and lighter R1 wheel to fit. So I`m going the digital speedo route now, would have liked to keep the mechanical type but hey it`ll be fine when it`s all done. The rare earth neodymium magnet for the `pulse` pick up fits snuggly in one of the disc bobbins and I`m going to plastic metal fill the back of the bobbin to keep it secure because of expansion and contraction that will occur in the bobbins when the bike`s being ridden and the brakes are used.

[meensy]

Your mincehead is stacked with knowledge mate cheers. I have used the same forks on my bike running an r1 wheel and discs, I have been scratching my head for some time with regards to this as I want to return my big to a standard ish condition with a few choice mods. Going down the machining route sounds like a fair bit of work but thanks for the heads up.

[TRiXy]

I can tell you and it involves milling off the boss on the inside of the left R1 fork leg, using a Thunderace front wheel and spindle with speedo drive and carefully machining spacers to centre the wheel.
I`ve just fitted a Thunderace front wheel, spindle etc but because I didn`t want to modify the stock R1 forks I tried to machine the speedo drive to get it in. I thought I had it licked but there`s not enough material on the speedo boss and the little bu**ger fell apart.
The steel insert that the helical gear runs on is a press fit into the alloy speedo housing and removing enough material to get the wheel assembly in means it self destructs.
You could take `some` material off the inner left fork leg, leaving less to remove from the speedo drive but then you`ve not got the forks left stock if at a later date you find a cheaper and lighter R1 wheel to fit. So I`m going the digital speedo route now, would have liked to keep the mechanical type but hey it`ll be fine when it`s all done. The rare earth neodymium magnet for the `pulse` pick up fits snuggly in one of the disc bobbins and I`m going to plastic metal fill the back of the bobbin to keep it secure because of expansion and contraction that will occur in the bobbins when the bike`s being ridden and the brakes are used.

I've not had to go down this path, but I'd like to... Would it not be easier to get the R1 speedo cable, and get a 'cable guy' to modify it? to suit the TRX speedo?

[Mincehead]

R1 speedo`s were never cable driven, were they? Answers on a postcard please folks if I`m wrong.
Thunderace, definately cable driven, as were FZR1000`s but R1`s?

[Kayla]

R1 speedo`s were never cable driven, were they? Answers on a postcard please folks if I`m wrong.
Thunderace, definately cable driven, as were FZR1000`s but R1`s?

Yep, the speedo reading is worked out from the front sprocket rpm on R1s

[Mincehead]

Ahaaaa, cheers for confirming that Kayla.
So....................................
To have cable driven speedo with R1 forks definately requires mods to the inner left fork leg lower (milling off material) and `some` (being careful, they WILL fall apart) off the outside edge of the speedo drive. A Thunderace wheel needs to be used as it has a speedo drive ring in it and is the right size through the bearings for the R1 wheel spindle.
A new wheel spacer on the opposite side wouldn`t be required if the dimensions were carefully worked out, making sure the wheel was still centralised in the forks.
Because I didn`t want to modify the stock R1 forks to accept an Ace wheel and mechanical speedo drive I`ve decided to go down a digital speedo route.

[Mincehead]

For all those hunting a complete R1 front end:

http://cgi.ebay.co.uk/Complete-Yamaha-R ... 1c1b74f308

Now that`s what I call complete!

[Skip6752008]

G Day

I didn't do any machining to the fork leg or the speedo drive - left it to professionals who know what their doing,,

Promach Eng made a new spindle which stepped down in size to suit the speedo drive and fitted a boss into the fork leg to bridge the size difference. Great job Mike did to.





Hope that helps

Skip

[Mincehead]

That front wheel must be a Thunderace wheel or was an R1 wheel machined to encompass a drive plate for the speedo drive?

[Skip6752008]

Correct

Thunderace wheel
Custom spindle
Std Speedo Drive
Std 02 R1 fork legs (Boss in left leg)
Std R1 bottom yoke (03)
TRX stem pressed into Yoke.
Custom top yoke to keep ignition barrel in centre (and looks cool)

[Thom]

I'm actually bidding on that front end so buggar off

[Skip6752008]

Well final assembly is complete and my TRX is Insured MOT'd and Taxed, so one thing left to do is GO HAVE FUN.

I wont bother you all with loads of build photos - me & my dad put the bike together over a weeks holiday, only hassle was wiring loom was a right mess so sourced another of ebay.

So the finished bike looks like........................................this!



I will be taking it to Rockingham next Sat for the performance Bike Weekender, which should be good fun if the weather stays dry