Hi Rich,
> >Can I take a moment to thank Steve at MOSS parts (Stockport UK) for holding
> >my hand through the operation despite being told off by his boss for doing
> >so.
>
> I've never bother with any of the Moss outfits, what are their prices like?
>
I agree about the prices, but I don't have to add postage, and I can go back
and shout at faces if things go wrong. Besides, there are some good blokes
there (Steve and Andy particularly), who are always willing to help - but as I
said their boss isn't too happy about it.
>
> >The problem seems to be with the fast idle cams...I can get a sweet fast
> >idle, perfectly ballanced at 1200 rpm, but when I release the choke, there
> >is still some pre-load I am wondering if the cams could have worn, so that
> >the screws have to be further out than normal at the fast idle position.
>
> I not quite sure what you mean here, when you say release, I take it you mean
> push the choke IN!
Yes...when I push the choke IN, the cams are still being moved a little by the
fast idle screw heads.
>
> I have found with my carbs(HS2's, but the same principal) that you get about
> .25 inch free play on the choke knob, then the jets lower a bit, then the
cams
> come into contact with the fast idle screws.
>
Now I'm not sure I understand, the choke on the HS4 works as follows:
First eighth inch... Free play to stop pre-load.
Next half inch... Increase idle speed only (cams move against screw
heads).
Remaining travel... Enrich mixture by lowering jets.
(not sure what happens to idle speed in this section)
For reference, I set the fast-idle at the end of the "next half inch", just
before the jets are moved...I assume this is correct.
> Now I don't mean to sound sarcastic or anything, but are you sure the linkage
> is assembled correctly, ie, you haven't got parts muddled up from left to
> right etc. I know the feeling well when I rebuilt my carb for my A40 Farina,
> I made a right bulls up to start with and that was only a single carb.
Not such a silly suggestion, I made particularly sure that I got things
together the right way round by only having one carb. apart at a time. But I
still managed to get the new choke linkages on the wrong carbs (both seperate
items came with waxstat conversion) and it took me days to work out why one of
the jets wouldn't go flush with the bridge.
However, The cams are the same way that they were before I touched them, I can
only assume that they were correct at that time, but they do seem to work apart
from the fast idle bit. As I said, I assume they're worn at the fast idle
setting position, but would like confirmation before I go in with a file.
Cheers,
Chris.
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-- 1977 Spitfire 1500...Everyday/Only Driver.
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