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HIF-4 problem & question on Grose Jets

To: mgs@autox.team.net
Subject: HIF-4 problem & question on Grose Jets
From: Rich Mason <rmason@ro.com>
Date: Tue, 10 Dec 1996 11:21:00 -0500
Hello all-

I'm contemplating some minor work on a HIF-4 (AUD550) and am looking to the
collective wisdom of this list once again.

Presently the rear carb is running excessively rich. I can not seem to lean
it out with the mixture adjusting screw but I can see the jet move up and
down while turning the mixture adjustment screw.  I am inclined to believe
that the float needle is not seating properly, or perhaps I have a leaking
seal on the starter valve?  Any other opinions?

I figure since I am going to pull the carb, I might as well replace all the
soft goods while I'm at it - that will fix the starter valve leakage if that
is the issue. 

What benefit (if any) is there to the Grose jets?  The PO suggested their
use - but I have no experience with them.

If I replace the needle and seat on the rear carb with a Grose jet, must I
do the same on the front carb (which is running very well!).

Thanks,

Rich Mason
1973 MGB
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