Re: [ST] chain tension on Single Sided Swingarm

[Neil Lindsey <Neil.Lindsey@xxxxxxx>]

Chain tension is maximum when the countershaft sprocket, swingarm pivot
and rear wheel axle all line up, but that isn't necessarily the criteria
to be used while measuring chain slack.

I understand that the exact wording has changed somewhat in newer issues
of the Sprint service manual, but in my issue, step #1 of chain slack
inspection (for both the RS and the ST) says "Set the motorcycle up on
the side or centre stand".  It then goes on to describe exactly where to
check for vertical movement of the drive chain.

I take this to mean that there's not enough of a difference to worry
about.  I haven't actually had a close look, but my guess is that the
rear axle hangs a bit low when the bike is on the centre stand and sits
a little high when the bike rests on the sidestand, and that the 35-40mm
spec takes this into account (note also that the chain slack spec is the
same for the RS with the DSSA).

On a related issue, my experience has been that most mechanics, Triumph
included, tend to adjust the chain too tight on Triumphs equipped with
the SSSA.  This saps power, causes excessive chain/sprocket wear and can
lead to a leak from the countershaft seal.  It's better to be a little
on the loose side.

HTH,
Neil



----- Original Message ----- 
From: "Marc Van Est" <MarcVE@xxxxxxxxxxxxxx>
To: <ST@xxxxxxxxxxxxxx>
Sent: Tuesday, September 20, 2005 12:40 AM
Subject: [ST] chain tension on Single Sided Swingarm


I'm looking for some confirmation here:

My manual for my '04 RS [first registered in 05] says to set the chain
at 35 to 40mm . The bike has the single sided swing arm, but no center
stand.

To check it I'm using a paddock stand that I had an engineering firm
knock up ( a crib of the Triumph one at half the price.)

This means that the rear wheel isn't suspended when I check the tension,
like it would be on the ST which has a centre stand - in other words, my
chain already has some tension on it when I'm measuring it.

Surely that would mean that the slack should be set a bit tighter than
the setting for an ST?

Anyone got a handle on this ?


thanks


Marc
Cape Town, South Africa.





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