SOHC.co.uk Forums > CB500/550
500 K cafe racer conversion - build thread
Ewan 500 K1:
--- Quote from: matthewmosse on September 08, 2013, 11:44:55 PM ---The 550 rear brake lining can crack up sometimes giving a nasty feeling brake and need for a new hub, or if you have a lathe then you machine out the cracked steel liner and insert a mini or morris minor drum - takes a wee while and some care but I've done it on my 500/4 sidecar outfit and that has seen quite a lot of milage since. I think that will be where morris minor bits will have come into it.
--- End quote ---
yep !!
Ewan 500 K1:
Another gripping episode from my Rake & Trail measuring shenanigans. First off, I've modified reply #133 on the previous page .... it wasn't the new shocks that were on when I did that first manual protractor / photo method at all.. it was the old shocks. I realised that when I went out to the shed today to take some more photos of the various combinations of rear shocks and Triple Ts to apply the manual protractor method to. So ... I took photos with new shocks and old bent Triple T, new shocks new straight Triple T , old shocks and new Triple T and old shocks with old bent Triple T. Four photos of each combination. Results were inconsistent with variations of up to one and a half degrees for the rake calculations for any one configuration.
However the Digital Protractor ( A.K.A. the inclinometer) arrived today (see first picture below) and this really has given consistent results (see third picture below), ... it was absolutely consistent in the change effects that both the new shocks and changing the Triple T had on rake and trail and this gives me loads of confidence in the figures. So thats me done and dusted with rake and trail measuring you'll all be glad to know. Its been an education for me at least ::).
So, I now reckon (with confidence) that..
1. A one degree change in rake = a reduction in trail of more or less 6.5mm (quarter of an inch)
2. For every 10mm increase in rear shock length there is a 0.48 degree reduction in rake and a 3mm recuction in trail.
and with a bit of acceptable tolerance that..
3. With the new longer shocks I've got a rake of 23.5 degrees giving a calculated trail of 91mm (3.64 inches). Stock figures are 26 degrees rake and 102.5mm (4.1 inches) trail.
Also got hold of a bargain basement GSXR steering damper today... might be a wee bit on the short side for a stock 500, but as I'm putting 10mm extra on the steering stop so that the ace handdlebars dont bang off the tank I reckon it should do the job. Just having trouble locating a suitable frame clamp (29mm) for the damper, anyone got any ideas .. maybe best bet is just to use a 30mm one ?.
Next up then ...
* Stripping back to bare frame again and getting a wee bit of welding done to one of the passenger footpeg mounts and the steering stop
* Make up my mind whether I want the frame silver or gloss black, then getting it powder coated
* Ordering my rear sets now that the Italians are back at work
* Make up my mind if I want to drill some holes in the front sprocket engine casing
* Bit of alloy polishing refresh
* Stick it all back togeather
* Bit of a tune up service
* Refine the rear light set up
And then we're ready to roll I hope.
Ewan 500 K1:
--- Quote from: Oddjob on September 08, 2013, 10:06:17 PM ---Yeah but yer got a moose loose aboot yer house :)
--- End quote ---
a perfect opportunity tae respond wae a "jings, crivens, help ma boab"
matthewmosse:
Sidecar mounting clamp onto the frame for damper? bit heavy.... Fabricate something from tube cut open withh a hacksaw with drilled 'ears' added with weld.
Ewan 500 K1:
Sorted on the steering damper clamp front , got a 30mm one from Dennis Trollope Racing at http://stores.ebay.co.uk/Dennis-Trollope-Racing . He's quite a bit cheaper than others for the same clamp. Although the 500 frame measures 29mm in diameter, the 30mm clamp tightens on fine. Not too happy now with the GXSR damper though. On the good side it bolts straight into the hole on the bottom of the 500 lower yoke. On the down side it does not allow the steering to go full lock to lock, this isnt really a problem for me as I intend reducing the lock to lock distance to stop the ace handlebars hitting the tank anyway. What I'm less happy about is the height the GSXR damper needs to sit at ... it sits too high and spoils the lines of the tank (see photos) Going to order an NHK ODM 500 damper from Dennis Trollope instead now which should sit better.
GSXR Dimensions
Mid point to eye (extended) 150mm
Mid point to eye (closed) 85mm
Travel 70mm
Body Length 128mm
NHK ODM 500 Dimensions
Mid point to eye (extended) 227mm
Mid point to eye (closed) 141mm
Travel 85mm
Body Length 154mm
so .. if any one wants to buy a used GSXR damper , its yours for £25 + P&P
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