Bonneville America Forums Forums Technical Forums Performance Mods Carb Collar install, plug and K&N...

I am a rookie in the process of cleaninga and jetting my carbs. All is going well as I did clearly find the root of the performance issue with the TBA. The left side carb pilot jet is virtually blocked and the left main was pretty gunked up as well... When I found that I decided to double check everything. Here is my dilemma and I'm sure its an easy fix I just need the answer.

I pulled the main jet holder and did not see the "collar" drop out on one of my carbs until I was reassembling it. By the time I figured out what it was the other dropped out.

I need to put them back in properly. Dinqua does not talk about them. They have a convex end and a concave end. I'm guessing the convex end goes up towards the needle. I also know that the Main jet holder should be installed to hold it up. The questionis this. Is there any adjustment to the installing the main jet holder/collar heighth? Of course this is once I know which end is up...

I have to order new pilot jets. The setup I'm looking at is
stock TBA needle, 42 Pilot jets, 230 mains, 3 trums out on the air screw. This is with the Short OEM off road exhaust. And Hi Flow K&N..

I also have an issue with the filter. The one I received is about an inch taller then the one I pulled out?

I also have to have a plug on one of the carbs. It goes on the side of the carb where the black plastic interconnect peice goes to the second carb. The black plastic peice has a nipple that has a hoseon it.. Vacuum maybe?

Thanks in advance

Woah!

I'm one of the rookie wrenches around here, but I'll tell you that a 230 main jet sounds WAAAAAAAY too big. I havent' heard of anybody around here going higher than like a 165, and that's with straight pipes and velocity stacks.

The other issues I'll let other, smarter members address.

--Jaeger

If the filter is an inch taller then you got the filter for a Bonneville and not an America/Speedmaster. Exchange it for the correct filter.


This is the order for the collar; I believe if you will run the jet holder in until it's tight and give it 1/8th of a turn (or less) to tighten it will be fine since the carb body is so soft. It's kind of a "feel" thing and it's often best to tread lightly and not gorilla it in.

And, you probably meant 130 mains which should be close.

I believe I have the collars back in correctly.
It looks like they seat into the holder ever so slightly. Plumbing 101.

130 mains... BIG typo there...

Now for my big mental midget move ...
My helper being a carb guy said the Air Mixture screw should be right behind this plug. (Side of carb NOT the bottom) and he said to drill it out and I would have access to said air mixture screws). Genius that I am I did as instructed with out double checking Dinquas instructions (which are excellent) and ended up pulling out a metal plug. No idea what it plugs but it sure as heck is not the air mixture screw. That I know now is on the bottom of the carb. Question is what is that I pulled, where can I get a replacemnet? The plug that I pulled is right above and to the left of the TPS mount but on the equialent position other carb. There's a black plastic shaft that connects the two carbs in line on the inner side of the carbs. The plastic peice has a nipple that attaches to a rubber hose.. Vacuum???

If you have a plug or know where I can get it, or know what it's called I would be grateful... I looked at bikebandit and they do not show a spare part for it at all...

Thanks

>The plastic peice has a nipple that attaches to a rubber hose.. Vacuum???

That sounds like the float bowl vent.

I'm having trouble visualizing the plug you speak of, but it likely is a plug to an internal passage.
Anything you can think of to plug it back without interfering with any internal passages would seem ok.

In defense of the person who said the pilot was on the side, I helped a friend with the CVs on his Honda Shadow, and the (plugged) pilots WERE on the side.
Don't remember just how those carbs were configured to make it work out that way.

I have a few old CVKs here with the side mixture screw. They have no TPS or heaters. Little dab of silicone should fix you up or even better would be some PC7 but be careful not to block the passage. I am not sure what you drilled into either, I haven't looked at my carbs and can't picture it off the top of my head.

I wonder if you accidentally drilled out the cover for over-run diaphragm? You might be able to epoxy a flat piece over the hole without killing its intended operation but take great care, if is in fact the over-run it keeps the motor from running way too lean at throttle off..



From the above photo which one is the one you drilled out?

Epoxy a small piece over it is a better idea than just using the PC7, use the PC7 to glue it on. It hold up to fuel very well. Back when I used to work in the junkyard we used that to patch gas tanks in our tool wagons and it never failed. The metal near it failed first. Those tanks would get smashed from having way too much weight in them and haviny way too much fun in them too.

I was thinking if it was the cover for the butterfly shaft (that'd be the one closest to the motor) a dab of JB Weld to fill the drilled hole might be all you'd need and then use PC7 around the base edge to glue the cap back on.

Actually it is on the left carb above the TPS mount and forward of it. I believe its part of the vacuum distribution from the engine. Looking into the hole with a flashlight I can't see anything that a drill bit would have touched or hit... I will PC7 it back together and should be fine... I may have some brass plugs turned but not to worried about it at this point. I think I can get them from Sudco but they have a $25 minimum.


Thanks

pic www.thevmc.com gbman photo album.. Carb Dooh

gb

Right off the bat I'll admit I'm not certain but that could easily be the other side of the bowl vent circuit. Should be easy enough to plug up tho with minimal drama.

I don't know what's in there, but what you drilled out is called a freeze plug/core plug/expansion plug/frost plug.
If you drilled it, the sides of it are probably still in there....
The sanitary fix would be to make sure the entire plug is removed and replace it with another plug. A little loctite on the sides and tap it in gently with a suitable drift and hammer.
It is probably a metric size, and no, I don't know where you get one. Maybe a place that fixes carbs, but no one fixes much of anything anymore.

The other repair is to mickey-mouse it with whatever gorilla snot you prefer.

All is going well..
Need to do some minor tweak to the air screws and I think I'm good to go...

Starts right up, accelerates good and runs good across the band.


Only two annoyances to take care of... I have the gurgleing exhaust on decel. IT has backfired once. And whe I shut it down it whomps out the exhaust...

I may have gone from real lean to a tad rich is my guess.
I put in 130 mains, new 42 pilots and and the air mixture is set to 2 3/4 turns from seat. (I do have the 125 mains available and I have yet to read the plugs which i will do)

I have to look but I'm thinking I need to adjust the airscrew a bit leaner, in 1/4 or 1/2 turn.

Air temp was 65 degrees...

Suggestions appreciated...

You really want a bit of popping at decel or you will definitely be running on the rich side at the under 1/2 throttle settings. You just have to decide how much you can tolerate...my guess is you're on the ever-so-slightly rich side of the mix setting and that excess fuel is giving you that neat "whomp" at shut down. A nice mix of guttural gurgling and popping is about right.