[Goober]

Ok I finished rebuilding my VE90E and have a question about the primer circuit routing.

From the bulb, I see fuel is probably forced from the bowl into a channel which has a tightly fitted square brass plug. From there fuel is routed to the bowl rim where it mates with a channel in the carb body. That channel to the carb throat looks plugged with a brass dowel. But carb cleaner leaked thru that hole.

Then there are three ports behind the butterfly.

Compressed air appears to be the only way to ensure these channels are clean?

 

[retro]

Pretty much yeah. I always fill the bowl with fuel before putting it on the carb. Then operate the primer to make sure the intake port & both check valves are clear and working. Sometimes junk will get pumped out the top past that upper check valve. Thats one passage that you cannot get to while cleaning...

After I'm sure everything in the bowl is clear and working good, I put the bowl on the carb and verify that fuel sprays into the throat. At that time I also verify that the float valve is sealing good, by filling the bowl with fuel through a short hose and funnel, then I attach a hand operated pressure pump (a small bicycle pump works well, even a large plastic syringe will work) and give it about 3 lbs of pressure or so. If that float valve is going to leak, it'll do it for you right then and there.

 

[SamUK]

If you want a big syringe I’ll ship you one, (no charge) we have large dosing syringes in our dispensary.

 

[retro]

I forgot to mention.. its usually a good idea to take the primer plunger back off from the bowl after testing it... just in case any stray debris in the intake port and check valve passage collected under the plunger. I haven't figured out a way to remove those two check valves without destroying them... not yet.

 

[retro]

I have a couple boxes of various surplus lab & medical syringes as well. They serve as great oilers (or greasers) for tiny bearings and bushings, especially if ya gotta shove a small needle under a rubber seal lip (as found on Honda oil cooler fans) to squirt oil or grease into a dry bushing. They'll put epoxy glue right where you need it too, without making a mess. If you have a need for a couple different sizes, shoot me a PM. Free stuff...!

 

[Goober]

Thanks Retro and Sam.
Cool! The primer circuit sprays from the base of that post on the inside rim of the throat?

Now that you put me on it I had some big syringes that I had to eat from when I had jaw surgery. I cut the stem off the old plunger and it fits perfectly to a syringe. I need a fuel resistant oring but then I can screw the old plunger flange to the carb, fill the syringe with fuel or cleaner, and flush the passages!
Thanks a bunch guys!

 

[retro]

Viton rubber o-rings & thin sheeting stands up well against almost every solvent or fuel type. You can usually get away with putting solvent in a syringe too for just a few minutes, then the soft plungers usually begin to swell up and stick. They are disposable anyway... I just toss 'em. Syringes are hard to find cheaply in bulk though, so I get mine from the university. They occasionally inventory and throw out any aging lab & medical supplies and when they do, I get a heads-up phone call from a friend to come an git um!

 

[SamUK]

we have a few syringes that don’t use rubber o rings and stand up well to solvent based solutions. They aren’t big dosing syringes, from memory I believe they are 30ml. If either of you would like a few drop me a pm.