Bit of an update on the rebuild.. Still bloody waiting or the head as it's spose to be finished this week..
But it gave me a chance to finish off wiring in the ignition so all the electrics should be finished..
The Carrozzeria magnesium 5 spoke front wheel from a xjr1200 has been fitted inplace but with the extra 5mm hub width, I needed to make a few changes as the discs sat hard up against the caliper so 1.5 mm off each of the calipers will get me back to centre.
Then a quick look with the new wavey discs bolted on instead of the std I came across another discrepancy.
9.5mm offset on a std disc but a std disc is 4mm thick. The wavey discs where 5mm thick giving me a 10.5mm offset so I settled on 2.5mm being machined off each caliper on their mounting points. I was lucky with the front end set up with the std wheel in place I had to have the front caliper shimmed with a 1mm washer so now I have a good scope to play with on tolerances and centering the caliper to which ever disc offset is fitted.
As for weights .. std rim with a 120/70 pilot power fitted came in at 9.4 kg (bearings & no discs)
Mag rim with a 120/70 Dunlop Q2 fitted came in at 7.3 kg (bearings & no discs)
With the q2 being .2kg heavier tyre on the mag wheel, I'll have shed 2.3kg from the front wheel with a common tyre being the Michelin.
And as for the rear, I have a 5 spoke Dymag which I started fitting up today. It came straight off a TRX, but my first task is to replace all wheel bearings and I've contacted Dymag and I'm waiting for all the torque settings and wheel history via the serial number.
The previous owner had overtightened the rear axle and what this does is presses the bearings against the crush tube in the centre of the rim and effectively seizes the bearing centre from spinning.
I was lucky in the respect the bike had very little Km's on it and sat most of it's life being pampered and the pilot power had very little if any wear.
But first lesson with lightweight wheels, only torque your axle to 1/2 spec so this does not become an issue.
And after all my tinkering today, I forgot to take a photo of the bike with new wheels fitted
I found myself an R6 throttle tube and body too for a quick action throttle set up and fitted that and all works fine with the TRX / FCR cable length.
The R6 has a 60* throttle and the TRX / R1 use a a 76* from memory.
So I'll settle on the mag wheels for the TRX as I figure about 80% of my riding now will be track related with just the odd ride and riding to and from the track.
I've offloaded the front lightweight forged aluminum Carrozzeria rim but I still have the rear if anyone is interested.
It's the same size and offset as a YZF750 but has a 20mm wheel bearing so an easy fit for a yzf750 rear as it's just a matter of placing a bush in the adjuster plates to reduce down to 20mm and extend through to the swing arm to slide for adjustment and using a 20mm axle.
If fitting to the trx swing arm all that is needed to do is machine 5mm off the inside of the cush drive carrier and with this design it is an easy mod as can be seen by the photos.
This section bolts to the hub itself and then the sprocket carrier slides into the 6 cush drives and is a separate piece again.
This is how they use a generic rim and centre hub and just use different disc and cush drive length bolt on sections for the desired offset needed for the bike to suit..
So much easier than modifying the std YZF rim to fit like I first done.
Here are a couple of photos I took with the rim sitting against the std YZF750 rim for a comparison.
You can see the extra weight with the massive hub section on the std rim and the deeper dish for strength and to keep the weight of the rim closer to the centre.
Weight wise the YZF rim with cush drive ,sprocket , bearings etc in place with no disc weighed 9.1 KG and the Carrozzeria forged aluminum came in at at 7.1kg with the bearings, sprocket and carrier with no disc so the same setup as the yzf wheel.
The sprocket on the lightweight rim is a 530 and a full plate so it would be easy to shed 1/2 KG + with a set up like the std sprocket or even more by a lightweight steel sprocket set up as I had on the original TRX rim from The Chain gang.
Anzac day tomorrow so another long weekend hen back to the rebuild come Monday with a few more pics and updates.
LEST WE FORGET
on those little things that just need a bit of attention to keep things neat and tidy.
Maybe keep the bracket shape and just space the coils bolts the reqired distance???
