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Old 07-13-2010, 08:41 AM   #1
weishaarkc
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Default Triumph 750 unscrews its own jets

My 74 T140V (dual Amal 930's) has had the annoying habit of unscrewing its jets while i'm riding it recently. I'm not a big fan of really cranking down jets hard because at some point i know i'm going to have to get them out and clean them, but I definitely tighten them down pretty snug. Any ideas as to what I could do to keep it from backing out from the vibration? I thought about using teflon tape but I don't know if it'll shred off when i thread it in and clog the carb and I also don't know what gas will do to it over time. Somebody I talked to suggested blue loctite. Any other ideas?
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Old 07-13-2010, 08:52 AM   #2
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Default Re: Triumph 750 unscrews its own jets

At this point I would be more concerned about the source of the vibration. It must be pretty intense to cause that jet issue to reoccur. Lots of Triumph vibration is timing off from cylinder to cylinder, carbs out of synch, loose engine mountings, primary chain issues, etc. That is what i would look at. If it is enough to make the jets fall out it must be an absolute joy to ride!
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Old 07-13-2010, 09:29 AM   #3
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Default Re: Triumph 750 unscrews its own jets

replace the "O" rings on the jets.
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Old 07-13-2010, 09:54 AM   #4
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Default Re: Triumph 750 unscrews its own jets

woah woah woah. O-rings? I think that may be my problem haha. Here's what they look like when they back themselves out:


Am I missing an O-ring?
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Old 07-13-2010, 10:26 AM   #5
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Cool Re: Triumph 750 unscrews its own jets

Tony the Torch - did you mean the throttle and idle mixture screws in reference to the o'rings?


weishaarkc

I've seen this question asked before on another forum, but have never experienced it myself and I don't think it is common. I snug them up with a 1/4" wrench or socket and good to go. I have started using a dab of white grease in the past couple of years and haven't ever had a problem with them backing out. This is for both main jet and needle jet.
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Old 07-13-2010, 10:42 AM   #6
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Default Re: Triumph 750 unscrews its own jets

No O-rings on the main jet holder, but holy crap clean those carbs! Disassemble and an overnight soak in a gallon of carb cleaner (go to your local auto parts chain store), flush under hot water, scrub and reassemble.

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Old 07-13-2010, 11:21 AM   #7
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Default Re: Triumph 750 unscrews its own jets

wow! I didn't think you ment the main jet I was refering the pilot and idled speed screw. if you got vibes doing that then you have vibration problems not jet problems!

By the way that carb looks like shit why don't you clean it
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Old 07-13-2010, 11:25 AM   #8
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Default Re: Triumph 750 unscrews its own jets

My left side carb has the weirdest corrosion i've ever seen inside it. My girlfriends stepdad was a BMW bike mechanic for 20 years and said he's never seen one like that but that it was functioning fine. We used a screwdriver to scrape the hard white stuff off the carb body and down in the bowl and soaked them in the paint bucket carb cleaner stuff (can't remember the correct name but you know what i mean) for 2 days and they still looked like that. They run fine when the jets holders don't back themselves out. The other carb is clean as a whistle inside but does the exact same thing.
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Old 07-13-2010, 11:52 AM   #9
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Default Re: Triumph 750 unscrews its own jets

Safety wire it...oh wait, that wouldn't work. Really, you shouldn't have to remove the jet block too often, so I would wrench that down. The jet itself is tougher than it looks, but it will break. I just broke off a jet trying to remove it from an old Webco jet plate, and after heating, soaking, etc, I really had to muscle that jet before it would break. Now I just need a tap to get that old brass jet out of my Webco jet plate.
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Old 07-13-2010, 12:06 PM   #10
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Default Re: Triumph 750 unscrews its own jets

Pete I had the same problem with a set of carbs years ago on a RD350. Did you try a new jet? I would not use teflon as the gas might cause it to get gummy if its exposed and clog jets. I used blue lock and that worked but I let it dry for 24 hours. I found it had alot to do with the threads being weeded on my carb body and wouldnt hold the jet.
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Old 07-13-2010, 01:37 PM   #11
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Default Re: Triumph 750 unscrews its own jets

So the gas won't affect the blue loctite?
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Old 07-13-2010, 01:40 PM   #12
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Default Re: Triumph 750 unscrews its own jets

i had that happen once. i tightened the shit out of it and it never happened again.

however, my carbs didn't look like a seagull took a shit inside of them.
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Old 07-13-2010, 01:45 PM   #13
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Default Re: Triumph 750 unscrews its own jets

Loctite in a carb bowl...hm.
Before I tried that, if I *had* to get that jet to stay in (like roadside, midnight, many miles to go) I'd ever so gently, carefully give those threads a tap on something flat to square off the threads & give them a little bite. But it does seem like there's something else going ton to vibrate that sucker out to begin with...
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Old 07-13-2010, 01:51 PM   #14
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Default Re: Triumph 750 unscrews its own jets

Permatex #2 on the jet threads might work. It does not harden like loctite and gets kind of tacky so it may help to keep the jet in place once the jet is tightened down. It is fuel safe. I use it to seal fuel tap threads.
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Old 07-13-2010, 01:53 PM   #15
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Default Re: Triumph 750 unscrews its own jets

Quote:
Originally Posted by Lurkingclass View Post
So the gas won't affect the blue loctite?
gas does not affect locktite, the only thing that does desolve locktite is water. we found this out when a guy used locktite when he thought it was assemble lube and put the rods on the crank.
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Old 07-13-2010, 01:54 PM   #16
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Default Re: Triumph 750 unscrews its own jets

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Originally Posted by Lurkingclass View Post
So the gas won't affect the blue loctite?
I was easy on the loctite and it was last ditch effort to ride with friends and I didnt have funds for the proper fix. I had no issues and did wait 24 plus hrs drying time. This I used as a band aid but it lasted 3 years until I replaced the carb bodies when I went to redo the top end.
If the jets are super loose I wouldnt try this effort as the fuel will leak past the threads. This was only a band aid that I used to get by in a pinch.
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