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Re: [T3] CO tester


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----- Original Message -----
From: "Dave Hall" <dave@hallvw.clara.co.uk>

> You'll probably find about 3% will serve well - the tester may only be +-
0.5%
> anyway.
> You may need a tad more.  I think that's still within the '80s pollution
> requirements (4% ?), not that we need worry about it in the UK.

Thanks Dave. I managed to find a nice 80's pro analyser for about the same
money as a Gunson unit. I would hope that it would be fairly accurate- you
have to calibrate it with cans of standard gas! Bit of a pain really, but
its a nice bit of kit. I'm waiting on a new probe assembly and some filters
before I can try it. BTW I found out why the Gunson needs calibrating to
2percent in fresh air- it actually measures CO2 levels- aparently CO2 and CO
levels are inversely proportional in exhaust gases. Clever!

> If both carbs need adjustment, either will show a change on the CO as you
screw
> in the mixture screw, but when you get down to the point where the engine
sounds
> to be hunting unscrew that a bit and pay attention to the other carb.  A
bit of
> tweaking on one or the other alternately should get it balanced for
mixture.
> Adjust the idle screws with the carb balancer to balance the throttle
openings.
>
> If everything is working well, that should result in that responsive and
> even-sounding induction roar which is music to the ears!

Can't wait ;-)

Mark



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