[MR2] Compression ratio
dkchal at datasync.com
Fri Jan 1 17:24:51 EST 2010
Don't I remember that MKI shims are available from your Yamaha Motorcycle
----- 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
: > 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
: > 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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