Paging Lozzo - carb query

Loz, you haven't got the pilot jet settings for a 1982 XJ550[1], have
you? US model, if that makes a difference.

I'm assuming one and a half - one and three quarter turns out.

[1] Just bought one. 12000 miles from new, superb nick, original
exhaust, just a bit woolly low down.

 

Nice little bike.

If it's like all the other Jap bikes of the period built to US spec,
you can count on either having to turn the needles out to 2-1/2 to 3
turns or and/or replace the pilot jets with the next larger size.

Even today the US spec bikes usually get the same carbs as the rest of the
world, but the idle screw/pilot jet settings are invariably leaner than
Euro spec, e.g., my SV650SK1 (2001) came with #15 pilot jets, the Euro
spec was #17.5, and the idle mixture screws were at 1-1/2 turns out.
Before I made those adjustments the engine surged horribly at small
throttle openings and low load. Now it purrs , especially when I use
'pure' gasoline (most gasoline here contains 10% ethanol).

 

Thanks, Mark. I had a feeling that US spec carbs might be different.

This runs beautifully, but is definitely woolly below 4 grand and sort
of chunters a bit.

I was wondering if it was the old problem of stale petrol, but it
doesn't feel like that. My guess is the pilot jet settings. I'll have a
play and put the carbs on the vacuum gauges.

Of course, being a US model, it's only got a single front disc, and no
provision fo a second caliper either. Still, it's got a steel brake hose
on it and it stops the bike OK.

PK, Lozzo!? have you got any pilot jets, sizes as above?

 

First proper bike I ever rode that (Superdreams and CZs do not count).
My memory is that it was wonderfully fast and smooth. I suspect the
spectacles are strongly tinted with rose I had an XJ600 much more
recently and I thought it was crap.

Regards, Ian

PS the next owner of this XJ550 chopped it! Interesting but not what I
would call successful.

 

The Older Gentleman fascinated us all by saying...

Sorry TOG, I don't have any jets at all, let them all go with the RD
spares when I sold them, stupid I know.

--
Lozzo
'95 Kawasaki ZZR1100D, '97 Kawasaki GPZ500S, '83 Honda CB250RS
Big Zed Little Zed Dead shed
New to ukrm? : www.ukrm.net/faq/ukrmscbt.html
"He's like a child, only not as clever"

 

Hm. Slight prob here. The pilot screw adjusters seem to be blanked off.
Looks like an early EPA anti-tamper thing.

Or are they somewhere other than in the side of the carb bodies???

 

Fr. Jack fascinated us all by saying...

Sometimes you can get to them by screwing a self-tapper in and wrenching
the plug out with pliers. All depends on the bike.

--
Lozzo
ZZR1100D, GPZ500S, CB250RS
BOTAFOT#57/70a, BOTAFOF#57, two#49, MIB#22, TCP#7, BONY#9,
ANORAK#9, DIAABTCOD#14, UKRMT5BB, IBW#013, MIRTTH#15a/16,
BotToS#8, GP#2, SBS#10, SH#3, DFV#14.
Url for ukrm newbies : http://www.ukrm.net/faq/ukrmscbt.html
www.mjkleathers.com

 

Hm. There are several orifices which could conceal the pilot screws. I
ain't about to attack at random.

 

Yeah, but I can't be arsed. It's just a niggle and I'm not keeping the
bike anyway, so wtf.

I'll stick the vacuum gauges on it, though.