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Message started by seve321 on 01/29/18 at 06:42:16

Title: pilot jet keeps falling out
Post by seve321 on 01/29/18 at 06:42:16

I've had this problem with the pilot jet backing out into the bowl. this happens when I'm riding and the bike gets really rough and dies. The first couple of time I figured I had it out too far. but it happens more and more now. I replaced it with a new one and happened twice in the same ride. Is this a common problem. I haven't seen anything on the forum about this. can I add loctite or something to keep it from backing out?

Title: Re: pilot jet keeps falling out
Post by Dave on 01/29/18 at 06:48:20

The pilot jet is in the float bowl - is that what is falling out?

Or....is it the idle fuel mixture screw that is falling out?
(The mixture screw should have a spring, O-ring and washer that keep it from turning and seal against leaking air).

Title: Re: pilot jet keeps falling out
Post by seve321 on 01/29/18 at 07:01:14

Its the pilot jet. It falls completely out of where it is screwed in and lays at the bottom of the bowl. so there's no regulation of gas through the carb.

Title: Re: pilot jet keeps falling out
Post by verslagen1 on 01/29/18 at 07:09:32

Never heard that one before.
Long skinny jet, not the button head main?
I would not want to use locktite, the jets are only brass and you might not ever get it out again.
maybe an o-ring?

Title: Re: pilot jet keeps falling out
Post by seve321 on 01/29/18 at 07:16:55

yeah, the long skinny jet. I actually replaced it twice thinking it was something from the manufacturer but same thing. Maybe teflon will be better and easier to remove if needed.

Title: Re: pilot jet keeps falling out
Post by Dave on 01/29/18 at 08:22:08

I think I would slightly deform the threads on the pilot jet....just enough that the jet has a slight drag while turning it in.

Or - you could cut the jet portion off a spare pilot jet so that only the threads remain....and use it as a "lock nut" under the real pilot jet.

Title: Re: pilot jet keeps falling out
Post by Gary_in_NJ on 01/29/18 at 08:30:19

Is this a previously owned bike? Sounds like a PO stripped the carb body. I hate to suggest this one, but it's safe if you are happy with the jetting - why not loctite the pilot jet into the carb body? Another method would be to braze it with some solder. With either approach, that jet will be a permanent fixture in the carb.

Title: Re: pilot jet keeps falling out
Post by justin_o_guy2 on 01/29/18 at 09:07:52

I have slightly deformed threads before. It usually works out great, just be cool with the starting thread. Maybe some Teflon tape?

Title: Re: pilot jet keeps falling out
Post by Dave on 01/29/18 at 09:54:25

764D4057464A51574C444956250 wrote:

Or - you could cut the jet portion off a spare pilot jet so that only the threads remain....and use it as a "lock nut" under the real pilot jet.

I thought you guys would really like this idea! :-?

Title: Re: pilot jet keeps falling out
Post by Gary_in_NJ on 01/29/18 at 10:06:59

6D565B4C5D514A4C575F524D3E0 wrote:
I thought you guys would really like this idea! :-?

I'm having trouble visualizing that one.

Title: Re: pilot jet keeps falling out
Post by Dave on 01/29/18 at 10:27:25

The pilot jet fits a long way up the hole - but I wonder how many threads in the carb body extend beyond the jet?

You could tap the carb body below the pilot jet for a retainer that had a larger thread size than the pilot jet....and snug a screw that is center drilled up against the bottom of the pilot jet.

Title: Re: pilot jet keeps falling out
Post by Dave on 01/29/18 at 10:36:48

I am going to have to pull out a spare carb and give it a good look at.

Title: Re: pilot jet keeps falling out
Post by seve321 on 01/29/18 at 12:36:05

My bike is a 86 and 2 previous owners before me, that I know of. So there's a good chance that someone stripped it. I don't want a permanent fix because I haven't been able to get the jetting right since it's been moving around so much.

Title: Re: pilot jet keeps falling out
Post by batman on 01/29/18 at 13:25:37

I'm not sure Epoxy will hold up to gasoline ,but if it would you could use it on the threads. the jet would be removable by applying a little heat, as it softens at only 150 degrees F.

Title: Re: pilot jet keeps falling out
Post by justin_o_guy2 on 01/29/18 at 14:13:36

Run it in by hand.
Wiggle it.
If it's feeling sloppy, wrap it with Teflon tape. Be careful to not let it extend above the end, fold it to be thicker in the middle of the threads and don't let it stop the jet below Home position.
If it doesn't stop the problem you're no worse off.
After that, go with Dave's answer, or start there. It's not hard to mess up brass threads. Needle nose pliers on the threads just enough to distort them enough to hold would not be difficult.
Just avoid the starting threads.
You Could even run a bit of dental floss around it.

Just pay attention to which way you wrap the Teflon tape or floss.

You just need to secure it enough so vibration doesn't allow it to back off.
The
Oring idea would work great
If you find the right size and can get a groove in the jets threaded area done right.

Title: Re: pilot jet keeps falling out
Post by LANCER on 01/29/18 at 14:14:33

4F45414B40494D441A1C18280 wrote:

That was my first thought too, a stripped pilot jet bore in the carb body, especially with it falling out multiple times; it's stripped.

Title: Re: pilot jet keeps falling out
Post by justin_o_guy2 on 01/29/18 at 15:45:00

Determine the condition of the threads by feeling of it when it's almost screwed in. If it's not something you can just rip out, the threads are still somewhat engaged.
Options exist.
A bit of solder in the jets threads maybe.
It's a brass jet. Maybe IT is more damaged than the carburetor threads.
Get a new one. See what happens. FEEL of it.

Title: Re: pilot jet keeps falling out
Post by Gary_in_NJ on 01/29/18 at 16:24:26

6E7177706D6A5B6B5B63717D36040 wrote:
It's a brass jet. Maybe IT is more damaged than the carburetor threads.
Get a new one. See what happens.

That is the logical first step.

Title: Re: pilot jet keeps falling out
Post by justin_o_guy2 on 01/29/18 at 16:30:25

A visual inspection should be able to show you.
A nut the same thread as the carburetor would certainly show you.

Title: Re: pilot jet keeps falling out
Post by Dave on 01/30/18 at 03:08:26

2E2D38212D2278744C0 wrote:

I'm not sure Epoxy will hold up to gasoline ,but if it would you could use it on the threads. the jet would be removable by applying a little heat, as it softens at only 150 degrees F.

Most epoxy and even RTV is not fuel proof, and will dissolve pretty quickly when exposed to gasoline....even tough JB Weld.

I drilled a couple small holes in the side of a can, and applied a dab of RTV gasket sealant on one hole and JB Weld on the other. They both started leaking in a few hours.

You might try a piece of rubber tubing that fits tightly in the hole. Put the jet in, then wiggle a small length of the rubber tubing underneath the jet.

Title: Re: pilot jet keeps falling out
Post by batman on 01/30/18 at 12:06:38

Shrink tube?

Title: Re: pilot jet keeps falling out
Post by hotrod on 01/30/18 at 12:38:10

I have used JB Weld with good results on carbs. Gas and vibration doesn't seem to affect it, even years later.

Title: Re: pilot jet keeps falling out
Post by verslagen1 on 01/30/18 at 12:58:55

I could make you a threaded plug that you could tap in over the pilot to keep in place.
And you could put a screw in it to yank it out.