killahurtz

So you are saying the YICS ports are useless of the carbs are balanced... Could I/should I disable the ports? I assume when you say permanent you are talking about disabling them.?.? On a side note, I want to thank you guys for the valuable input. Often on some forums people are not so nice to new members with questions such as mine. Thanks! I will do the carbs next week and report back!

Well I just got the bike here the other day where I could get into it, been crazy around here. First things first, drained the oil because it was over full, I think half of what I drained was pure gas mixed with the oil, had way more than 2.5 qts in it. Being that one cyl wasn't firing for longer than maybe they thought i guess that much could have washed down or maybe the oil has not been changed in forever, who knows, but it smelled badly of gas. With new oil in, I retested the compression and am getting 120 psi +-4 in each cyl. I switched the #1 and #4 HT wires out and sure enough #1 would fire and #4 would not. I will note that I tested the #1 cable with the spark plug in and grounded on the head and it was sparking, however not as strong as I would have liked. I trimmed a .5 inch off of the HT cable where the boot screws onto and re-attached it. That seemed to help some, as I could get it to idle without choke and I even rode it (not far). Ride report: Thing is ROUGH running!!! I am not a bike mechanic, my experience comes from heavy equipment, however I have owned bikes in the past and present. This thing should be as smooth as silk for an I-4. It rides like my V-twin SV650 when you get water in the front cyl plug well in the rain. So my diagnosis is that this thing needs the carbs gone through and a valve adjustment first and foremost. Maybe also a new coil pack and wires for #1 and #4. Anyone have other ideas? So is there any way I can balance the carbs without this special YICS tool? Can I make one of my own easily?

Hi Jim, Yes the bike has a YICS head. I found a service manual online and was reading through that. You say to discount the ignition because cyl #3 would be acting up.... I thought the service manual said that #1 and #4 fire at the same time and #2 and #3. I could have not been reading that right. So far I only tested compression on #1 and #2, as they are right next to each other and was easy, they were very close. I will test the rest after I go pickup the bike. Thanks!

Hi All, I am working on an 82 XJ 650 and having an issue I cant seem to figure out. Before I start tearing things apart I thought to check here. The #1 cylinder is dead. The bike will only run when choked and is very rough. If you pull the plug caps off while running they all have an effect on the idle except #1. Also gas is spewing from the exhaust on that side of the engine, lots of it. So far what I have done: Changed plugs -- no change Checked compression -- fine Checked for spark on #1 wire and plug -- it has it The bike has only 8500 miles on it and is in other wise very good shape and seems to be well maintained, only ridden by a woman. Could it be the valves need adjusting, or maybe the #1 carb is flooding it? Thanks!