[MR2] Compression ratio

[Donald Chalfant]

Don't I remember that MKI shims are available from your Yamaha Motorcycle 
dealer?
----- Original Message ----- 
From: "Kurt Krueger" <telek2 at att.net>
To: "John Treadwell" <DBSS_Gohan at hotmail.com>; "Aaron Willis" 
<AWillis at lithia.com>
Cc: <mr2 at mr2.com>
Sent: Friday, January 01, 2010 1:09 PM
Subject: Re: [MR2] Compression ratio


:
: -------------- Original message ----------------------
: From: "John Treadwell" <DBSS_Gohan at hotmail.com>
: >
: > Alright, I will have to get a copy of this book, but if I understand 
this
: > shimmy shimmy process, it involves checking the valve clearance with a
: > feeler gauge, and then, if they are off, you somehow, remove the current
: > shim for that specific valve, test it with a micrometer, and then 
replace it
: > with a shim that is the appropriate size?
: > Is that about right?
: > Thanks,
: > --John
:
: That's about right.  The tricky part is depressing the valve and holding
: it open so you can get the shim in and out.  The shims won't come out
: otherwise.  The special tool depresses the valve by wedging between the
: shim and the cam lobe.  Then you need something to hold the valve
: open w/o contacting the shim.  The tool set will include a small
: metal bar that is inserted between the edge of the bucket and the
: cam shaft (the shaft itself, not the lobe).
:
: For my MkI I ground and polished a cold chisel to use to wedge the
: value open.  And then ground a piece of flat stock to hold the
: valve open.  But now there are tools available for not too much
: money.  I bought one from a list member several years ago.
:
: Also in the BGB is a chart of shim number vs. thickness.  Something
: you'll need if you have to order a shim.  MkI shims are pretty
: much a special order only item,  MkII possibly the same or
: getting close.
:
:
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