My Desmodromic valves, 56k beware.

[Klause]

Second time I've done them now but thought I'd share my experience's with you.

Abit of a mouth full but really is quite easy, just different.

https://img434.imageshack.us/img434/4803/valvediagram5cc.gif

Desmo valves push down on the valves and lift them back up, unlike your normal valve system that relies on springs to bring the valves shut.

This means there are two clearances to measure A and B in the picture.

A, being the opener clearance is quite easy to measure just like any other valve clearance check.
B, on the other hand is different, not so important either, aslong as the shim can be turned with finger pressure with some resistance then it's normally ok. If it's dead tight or moves way to freely then measuring will be required.

Anyway...

You take the inspection covers and find yourself this...
https://img68.imageshack.us/img68/7271/dscf00193lk.jpg

Just like the picture! Anyway you get your engine to TDC and measure gap A and feel the closing shim.

Gap A measures a little too small. Needs to be 0.15mm and my feeler guage won't fit in, 0.10mm feels a little too loose so I reck'n it's around 0.11mm. No problem! Means I don't have to buy shims, all I need to do is sand it smaller.

You take out a clip slide the rocker across and take the shim off the top of the valve, like so...

https://img423.imageshack.us/img423/7421/dscf00212gi.jpg

You go upstairs to a comfy chair and desk, measure the shim, then work out how much you need to take off it.

0.11 gap measured. 0.15 wanted
0.04 to take of
shim = 2.94
2.94-0.04 = 2.90

So I just need to sand it down to 2.90, I use an honing stone seems to work well and keep it even, used the smooth side to polish it off. I just keep measuring it every 30seconds of sanding to make sure I don't go past what I want.

https://img508.imageshack.us/img508/5183/dscf00178xa.jpg

https://img144.imageshack.us/img144/2615/dscf00163ly.jpg

I'm 18 and can do it, ok fair enough I've done a bike mechanics course, but they didn't teach us how to do this, just how it works.

https://img75.imageshack.us/img75/5751/dscf00229ph.jpg
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Current bikes: 1960 Triumph 5ta x2, TTR600RE, KTM200EXC, Cagiva Elephant 900ie.

[Zimbo]

Nice one Klause, it's nice and easy isn't it???

[Klause]

[garth]

what's hiding under the covers in the last pic?

Italians just use big words to scare the owners into getting them serviced and anally raped by dealers
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You ain't a has been if you never was

[Klause]

[kat250]

so how easy was it to change the engine? And was it the imi course you did?
____________________
in the famous word of jimmy pop "would you F*ck me for blow"
In the words of banditshigh "would you blow me to f*ck"

[palmer]

Whats that in aid of then?

[Klause]

[Wave2k]

Can you do my Desmo valves .
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Ducati 1299 Panigale
2009 Corvette C6 z51
RS125->CBR400->RXS100->GSXR750K2->Ducati749S->CBR600RR5->TL1000R->DRz400->RSVR1000->Honda VTR SP1->CBR400->GSXR1000K6->Honda H100->CBR600RR3->Ducati1299

[Klause]

[Zimbo]

[Kickstart]

[Klause]

[Kickstart]