First off, thanks to all who contributed there $0.02 towards my Solex
situation. I'd like to report that after dismantling and cleaning each
carb (again) as well as careful set-up and balancing, my roadster now
works as intended. I had checked for throttle shaft / butterfly problems
(thanks for the info, Peter) and all seemed well in that aspect. I did
find some deposits of varnished fuel, which probably created some type
of blockage somewhere. In speaking with the previous owner, he hadn't
put fuel stabilizer in the tank before it's winter hibernation,
something I've done with all my vehicles and have never had any of these
problems. From what I've heard / read, fuel can go bad in 4-6 weeks -
anyone who stores or doesn't drive their roadster for any length of time
should seriously consider putting an additive in there tank.
Thanks to all again.
-----Original Message-----
From: Vicki Burrows [mailto:gregnvicki@earthlink.net]
Sent: Friday, June 14, 2002 10:30 PM
To: lino.baggio@idxcorporation.ca; datsun-roadsters@autox.team.net
Subject: Re: Solex that doesn't suck
Tricks? Nope I can't help you there. I looked over the exploded
picture of the carb looking for possible places to leak. My guess
remains with a missing or worn throttle shaft seal, or a bent shaft as
Carl suggested. Another possiblity listed in the Mikuni manual is an air
leak at the starter disc. Remove it and clean it, making sure that you
don't damage the surfaces of the disc or carb where they meet.
Regarding your accelerator jets and the one that was plugged, make sure
you cleaned that out well with carb cleaner and compressed air (sounds
like you did). They tend to plug as the holes are very small. Also,
don't lose the little washer that goes on the bottom of the accelerator
jet. There is also supposed to be a small round rubber o-ring that goes
on the cap screw that covers the jet... not sure if it were missing if
it would leak air or not. Keep us posted Greg
linob wrote:
> I've also tried carb cleaner - hoping for the quick fix in a can
> approach. When I had the carb off and apart (partially apart), I did
> find a tear in the gasket for the plate covering the jets - which I
> replaced and thought that was the source of my air leak. Didn't do the
> trick. I should also note that when the carbs where off the car,
> moving the throttle caused the fuel to stream out a few feet on all
> barrels except the one that is causing me trouble - it just sort of
> leaked out. After I cleaned things out with compressed air, I was
> able to get all 4 barrels to stream fuel evenly. I'm going to do more
> wrenching this week-end - any tricks with removing / inspecting the
> throttle shaft?
>
> -----Original Message-----
> From: owner-datsun-roadsters@autox.team.net
> [mailto:owner-datsun-roadsters@autox.team.net] On Behalf Of Vicki
> Burrows
> Sent: Friday, June 14, 2002 12:03 AM
> To: linob
> Cc: datsun-roadsters@autox.team.net
> Subject: Re: Solex that doesn't suck
>
> The only thing I can think of is that you have a vacuum leak
> somewhere. Have you tried the old " spray carb cleaner around the
> gaskets" trick? Did you inspect the carb when you took it off...
> looking for any place where it could be cracked, missing a seal (like
> around the shaft), bolt, etc... I am grasping here, but I can imagine
> no other explanation. What does the plug look like? Greg Burrows
>
> linob wrote:
>
> > Hi All,
> > I'm hoping that someone can shed some light on this rather
> > frustrating
>
> > situation, I'll try to be brief: I have a U20 with old style
> > solex's, I was originally having trouble with a compression loss in
> > cylinder #4, trouble shooting lead to trouble in the head, pulled
> > the head, had
>
> > everything freshened up by a competent machinist with experience
> > with these motors, head is now OK, but still having difficulties
> > with #4 cylinder. I switched carbs front to back, and now have
> > trouble with #2 cylinder, which isolates trouble with that carb. It
> > doesn't seem to
>
> > flow as much air as the other carb - my airflow meter confirms this.
> > I've checked, cleaned all the jets, gaskets, venturies,ect and still
> > can't seem to get an improvement in airflow. I can easily get
> > everything to idle properly and have followed the manual for proper
> > balancing, which I can get it to do by over adjusting the one carb,
> > but pulling the spark plug wire at #2 cylinder doesn't make a
> > difference in engine performance. Any ideas?
> >
> > Thanks in advance...
> >
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