Question about 1985 Yamaha XJ 700 X Maxim

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XJ700XN Bike won't run with choke off and dies when throttling up. Uneven idle.

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The Yamaha XJ carbs function in reverse of normal carbs in that the choke is not a choke, but rather an enrichment circuit. The passages involved are extremely small and easily gummed up with gas which has been allowed to sit in them. Allowing fuel to sit in them is the biggest cause of tuning issues for a machine previously running fine. The easiest solution will hopefully be: drain all the old fuel out of the carb bowls and the rest of the fuel system. Add one gallon of gas along with a half can of Seafoam. Prime the carbs and attempt to start the bike. You may need ether to get it to start initially. If the carbs are not completely clogged and the engine will run, keep it going for about 5 minutes and then allow it to sit for some period of time, allowing the Seafoam to work on dissolving the ick. During this period of using the Seafoam, the engine will not be running the greatest, but that is because it is dealing with the crud the Seafoam is loosening/dissovling. If you continue to have problems after going through this around 4 times, or if you are never able to get the bike going, the odds are that the carburetors need a major cleaning/overhaul.

Do not be dismayed. Go to www.xjbikes.com and search for "in the church of clean" for an excellent blow by blow with photos of how to restore your carbs to optimal condition. Alternatively, for those without any mechanical inclination, you can search for a local shop which will do the job, but make certain, for example, that upon completion the main slides can pass the "clunk" test: With the top off the carb, do the slides clunk when manually raised and dropped. If they do not, then the slides will not move properly when the top is on and you have vacuum above the diagphragm. This is an indication that the person who serviced your carbs did not do it properly and probably just dropped them in a can of carb cleaner rather than fully dismantlying and making sure every surface is polished and every oriface cleared. For any other questions regarding your Yamaha XJ motorcycle, xjbikes.com is probably your very best source of information and help. - And no, I don't get anything for plugging them.

Posted on Apr 16, 2012

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Hi, Andrew and the usual suspects are:

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2. Fuel filter clogged.

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7. Carburetor bowl vent line clogged/blocked/pinched.
8. Idle adjusting screw set too low.
9. Air/fuel mixture screw set too lean.
10. Idle port, transfer ports, slow air jet clogged.
11. Slow fuel jet clogged.
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