Re: [ST] Valve design

["Mike Benzon" <fast87@xxxxxxxxxxx>]

If the valves are getting tighter, most likely they are cupping. If the cam
or shims are wearing, the valves would be getting looser.

Only wear on the valve and valve seat will cause the valves to get tighter.

Mike
- ----- Original Message -----
From: "Dan Wallander" <triumph99@xxxxxxxxxxxxx>
To: <ST@xxxxxxxxxxxxxx>
Sent: Monday, May 19, 2003 7:11 PM
Subject: RE: [ST] Valve design


> The valves get a bit on the tight side.  Like I said, they have never
gotten
> out of spec, but I always set them towards the loose end of the range.
The
> 12,000 mile service had 6 valves adjusted.  Every other one has had only
one
> or two valves adjusted.  If I had done no adjustments, some of the valves
> may have closed all the way.  That happens to the beemer every once in a
> while and then gas mileage, power, everything pretty much sucks.
>
> I really don't know what is wearing specifically.  I can only assume that
> everything that makes some kind of contact wears.  The cam lobes, the
shims,
> the buckets, the valves stems, the seats and the valves.  Mostly the
valves
> probably.  We're not talking about a lot of movement here, a few
hundredths
> of a millimeter.  The Beemer on the other hand, is most likely (at this
> point) just loosing it's adjustment through the screw and locknut
mechanism,
> though they generally need valve and seat replacements far sooner than I
> expect on the Triumph.
>
> Sorry I didn't reply quicker.  Been working too much this week already.
>
>
>
> Dan Wallander
> www.danwallander.com
> Albuquerque, NM
> '99 Triumph Sprint ST
> '74 BMW R90/6
>
> -----Original Message-----
> From: owner-st@xxxxxxxxxx [mailto:owner-st@xxxxxxxxxx]On Behalf Of Mike
> Benzon
> Sent: Sunday, May 18, 2003 7:22 AM
> To: ST@xxxxxxxxxxxxxx
> Subject: Re: [ST] Valve design
>
> Dan, when you have performed your valve adjustment checks, have you been
> required to make adjustments? If so, what is wearing?
>
>
>
>
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