[Mgs] Carbs still being nasty

Clayton Kirkwood crk at godblessthe.us
Tue Dec 27 13:52:56 MST 2016


I have no idea which kind of SU's I have. This is on a 62A. How am I to
tell?

 

From: PaulHunt73 [mailto:paulhunt73 at virginmedia.com] 
Sent: Tuesday, December 27, 2016 12:45 AM
To: crk at godblessthe.us; mgs at autox.team.net
Subject: Re: [Mgs] Carbs still being nasty

 

OK, twin SUs then, but HS or HIF?

 

Screw both the idle screws in until you can get it to idle, only then can
you really have any chance of adjusting the air-flow balance and mixture.

 

If you still have problems getting it to idle, perhaps the mixtures are way
out.  The starting point is to screw the jets up until the top is flush with
the bridge, then screw back down two full turns.  You will probably also
need some enrichment from the choke.

 

For air-flow balance yes when listening with a tube at the carb intakes if
one carb is quieter than the other the quieter one needs the idle screw to
be screwed in further until the sounds are as equal as you can judge.  This
should speed up the idle, so while doing that the louder carb may well need
its screw unscrewed a little to keep the engine at a reasonable idle speed.

 

Whilst you can adjust for air-flow balance while the engine is warming you
won't be able to adjust properly for mixture until the engine is fully up to
temperature.

 

PaulH.

 

 

----- Original Message ----- 

I can't keep the engine running when tuning for both slow idle, it dies as
soon as I start it. I have had some success listening through the rubber
tube and there is significant difference. I presume the intake which sounds
weaker needs the idle raised??

 

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