• Required reading for all forum users!!!

    Welcome!
    Register to access the full functionality of the GSResources forum. Until you register and activate your account you will not have full forum access, nor will you be able to post or reply to messages.

    A note to new registrants...
    All new forum registrations must be activated via email before you have full access to the forum.

    A Special Note about Email accounts!
    DO NOT SIGN UP USING hotmail, outlook, gmx, sbcglobal, att, bellsouth or email.com. They delete our forum signup emails.

    A note to old forum members...
    I receive numerous requests from people who can no longer log in because their accounts were deleted. As mentioned in the forum FAQ, user accounts are deleted if you haven't logged in for the past 6 months. If you can't log in, then create a new forum account. If you don't get an error message, then check your email account for an activation message. If you get a message stating that the email address is already in use, then your account still exists so follow the instructions in the forum FAQ for resetting your password.

    Have you forgotten your password or have a new email address? Then read the forum FAQ for details on how to reset it.

    Any email requests for "can't log in anymore" problems or "lost my password" problems will be deleted. Read the forum FAQ and follow the instructions there - that's what we have one for...

  • Returning Visitors

    If you are a returning visitor who never received your confirmation email, then odds are your email provider is blockinig emails from our server. The only thing that can be done to get around this is you will have to try creating another forum account using an email address from another domain.

    If you are a returning visitor to the forum and can't log in using your old forum name and password but used to be able to then chances are your account is deleted. Purges of the databases are done regularly. You will have to create a new forum account and you should be all set.

Pilot jet plug? 82 550L

  • Thread starter Thread starter Tarbash 27
  • Start date Start date
T

Tarbash 27

Guest
Cleaning out carbs on my 82 550L trike project, Do I need the rubber plug covering the pilot jets? or can I take them out. Is it just for emissions?
 
You need them....if you don't put them in the pilot circut will pull more fuel ......you talking about the ones inside the float bowl,,,correct?
 
whats the purpose of them? what differences would there be without them?
 
You will pull more fuel through the pilot circut and it will flow over into the main and air circuts.....you wont get a good idle and you will run rich past idle......I could go into great detail, but there are many sites on the web that will show pictures of what happens and so onnnnnnnnnnn ....hope that helps
Kevin
 
It all depends on who you ask.
popcorn.gif

http://www.thegsresources.com/_forum/showthread.php?t=99727
 
It would make sense to leave it as the pilot ciruit is fed by the main jet, so if you remove that plug you will screw up the fuel metering of the pilot circuit... Sure you COULD remove it, change your pilot fuel jet, pilot air jet, and adjust the hell out of it and it might run properly, but why?
 
Replace them with new. When I rebuilt my carbs the plugs were hard and wouldn't stay put. I think it cost me less than $5 for all four.

Brad bt
 
Ok, I read everyones response and am still wondering. Whats the reason for this setup with the rubber plug? why do they make it different than vm carbs. I totally understand my vm26's but why the extra hassle with the pilot jet on cv's. Whats the purpose of fuel first going through the main than pilot? It makes more sense to me on the vm carbs.
 
Thanks distraction628. This has come up before, and most said they weren't needed. I distinctly remember when at our local shop, one of the mechanics cleaned the carbs on an "80" GS 1000, that had been sitting for a year or so. After the cleaning, the bike started, reved, & ran fine, while in the parking lot. But as soon as the owner started pulling out in traffic, the bike died deader than 4 o"clock. We pushed him back in the shop, & the mechanic said dammm & pointed at the 4 little plugs laying on the edge of the work bench. Put the plugs in, fired it up, & all was well. Some, here said the mechanic did something else, besides replacing those plugs, that they won't affect anything by not being in place. I looked up this mechanic, who I hadn't seen in appx. 20 yrs., with the computer, & found him apprx. 100 mi from here. I called to see if he could remember this incidend, to verify what I remembered, but he couldn't remember it at all. Oh well, It was good to talk wiht him again after all this time. But thanks distraction628, now there are more than 1 of me, that think they've got to be in place.
 
CarbCut.jpg


If you follow the fuel flow for the pilot circuit it comes from the main jet through small passages. If you don't have the cap it will also suck through where the cap goes and you will run rich.
 
It's still being metered by the pilot jet. Same vacuum, same flow. Doesn't matter where the fuel comes from or what path it takes. The illustration makes it easy to see. If anything, it could run leaner because the pilot jet is a little higher than the main jet. That could explain the previous story where the bike ran fine in the parking lot but when they tried to take off down the street, it starved for fuel. Bike runs fine while revving in neutral, stalls under load. Classic fuel starvation, not a rich condition. I still think if the float level "range" is correct, no fuel starvation would be noticable if the pilot circuit fuel originated at the unplugged pilot jet passage. But as I said, if anything, it could run lean. Funny how everyone has such different stories to tell how the plugs/no plugs effected performance. If plug related, every single bike would be effected the same way. Instead, we get feedback how it ran fine, or didn't. My experience? Ran fine. Only reason we didn't replace the worn plugs was the owner said he didn't want to order the plugs and he wanted to get the carbs back on that day.
I don't know why there's such a debate, seeing that the plugs cost so little. Just buy them and put them in if you worry about it.
 
What I want to know is why they didnt make the pilot jets work like they did in VM carbs? The pilots are just sticking out into the bowl, there not buried in a hole with a rubber cap and a secret tunnel from the mains.
 
What happens without the plugs is the fuel is drawn without the air drawn pressue from the main jet passage which inturn may cause a flooding affect at lower atmospheric pressure and lean at high atmospheric pressure...This was a desighned so with the plugs in place was suppossed to keep the bike from running to rich at high altitude. you may not notice any difference below sea level without the plugs but at anything above 2000 ft. you should notice that you are running way to rich. Where with the plugs it would be still rich but not near as much.....just what I was taught.....In Japan.....at the Nissan development division.....That is why Nissan went to fuel injection on the race cars in the late 70's for high altitude races and stayed with multiple carb set ups for lower altitude races...Keith I'm not trying to say your wrong just sharing what I learnd. I saw the effect of the plug in test situations, multi CV mikuni carbs on race motors...yes from flat side to dual throats we did them all trying to get the extra edge on the track, yes cars a different from bikes but internal combustion is the same principle...Just my 2 cents worth...
Later ride safe all
Kevin
 
You must log in or register to reply here.
Back
Top