A
Anonymous
Guest
Did you ever switch number 1 and 4 plug wires, they fire the same and that would eliminate the spark issue. I had the similar issue but it was a dead plug.
-
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.
A
Anonymous
Guest
Alright, I screwed with it some more this weekend. To answere the previous questions, yes, the plug is wet and it has been fouling out. I have been changing different plugs. Also, I have swapped the #1 and #4 plug lead nothing happens and #1 still runs fine. So Saturday I checked to make sure there wasn't extra fuel coming out of the #4 and all was well there. I pulled the valve cover and everything there was fine. So I was at my wits end and I had an idea. I pulled the screw for the merc stix causing a major air leak, wouldn't you know it, it started to fire. however not without a lot of smoke and some popping. So I fooled with that for a couple of minutes and it stops firing, so I changed the plug and put the screw back in. Then I opened the butterfly valve so that it would get more air, still wouldn't fire. Anyways, I went the opposite direction and went full choke making it really rich. The little whore fired again then after a couple of seconds fouled the plug. By that time I had had enough torture for one day and went home. So here is where I am at, I am pretty sure that it isn't engine problems, pretty much 100% sure it isn't electrical, so all that leaves is the carburetors. Are there any holy men out there that I can take my carburetors to and have them blessed? Any Suggestions?
The most likely cause of your problem is a poor carb synch. Don't underestimate what vacuum imbalance can do. I consider myself pretty good at synching carbs by eye. I always do my best to make the final vacuum tool synch easier/faster. Everytime I hook up the tool, it shows that my bench synch was not good enough. If the vacuum level is too high (compared to the others) that cylinder will run rich. The carb synch is the easiest thing to check before going back into the carbs. Of course, you need the tool first. If the problem still exists after a vacuum tool synch, then it's either too much fuel or not enough air atomizing the fuel before entering the carb throat.
If it's too much fuel, it could be float level, sticking float, ruptured float, poor sealing float valve, leaking or missing gasket or o-ring for the float valve seat, incorrect size jet(s), loose jet(s), mixture screw adjustment, worn jet needle, leaking o-ring around needle jet, and the carb synch.
If not enough air, it could be a dirty/blocked air passage or air jet, dirty needle jet/bleed pipe holes, mixture screw adjustment, and the carb synch.
It could also be the diaphragm/spring assembly installed wrong or binding.
If it's too much fuel, it could be float level, sticking float, ruptured float, poor sealing float valve, leaking or missing gasket or o-ring for the float valve seat, incorrect size jet(s), loose jet(s), mixture screw adjustment, worn jet needle, leaking o-ring around needle jet, and the carb synch.
If not enough air, it could be a dirty/blocked air passage or air jet, dirty needle jet/bleed pipe holes, mixture screw adjustment, and the carb synch.
It could also be the diaphragm/spring assembly installed wrong or binding.
A
Anonymous
Guest
Well Its back into the carbs, I know that they need to be vacum synched, but they have to run on the bench synch in order to do that. So, next time I can get to it I will pull them again, recheck all jets, I have multiple spares so I will swap out as much as I can in order to eliminate possibilities.
Yes, carbs can run on a bench synch, but if the vacuum is too high in one cylinder compared to the others, the richer mixture will eventually foul the plug. If you have access to a vacuum tool, hook it up and note the vacuum level of #4. If it's about 3/4" or more higher than the others, that's most likely your problem. If the level is close or even a bit lower than the others, you can stop right there if you like and concentrate on other parts in the carb.kingoftheroad said:
If not the vacuum level, it must be something I mentioned before.
Let me add to my list under "too much fuel"..
Be sure you re-assembled the diaphragm/spring assembly with any jet needle spacer(s) in the correct order, etc.
Also, be sure the choke plunger to #4 is completely sealing when down.
And if you had those rubber plugs over the pilot jet entrance, did you remove them? Some say their bike ran bad when they tried removing them.
Lastly, did you replace the pilot jet with another? On some Mikuni carbs, there are two different pilot jets available. They come in two lengths, and they also come with a different number of holes in their tube. Be sure your #4 pilot jet matches the others exactly. Needle jets can be confused in this way too. Use only Mikuni jets, not DJ or some other brand.
