Trouble shooting nightmare check here!!!

[natemoen]

YOu really ought to start a new thread, rather than hijack thisone. Otherwise things are going to get very complicated......

Agreed, especially since people DO NOT look at the dates on threads and they will start answering the original question from 8 years ago.

Especially since you have EFI, which is a WHOLE different beast of its own.

[shutchis]

Yes, Opening a new thread would have been smarter. I'll check the kill switch & wiring. This was something I hadn't considered. Note: This problem showed up after I installed an XJ alernator and a new R&R regulator. If no joy today, I'll start a new note.

Thanks for responding. You may have identified my problem. On a related topic, I'm riding my other bike, the XJ1100, runs like a big cat! Stan H.

[warfman41]

agree with topcat

I'm new to this particular bike community, but have a long mechanical background, and i have seen water in the fuel cause the problem's your having. May be a ridiculously easy fix, but i would try flushing my tank and carb's out really good and make sure there is no water in there. Best of luck. Warfman

[Brent]

check voltage drop

This might be totally off the wall, but have you checked the connections at the fuse box for the ignition fuse? Maybe a poor connection at the fuse or on the back of the box might be causing the ignition to have low power intermittently. Or it could be a problem in the ignition switch or the emergency kill switch. Does your bike have the tip-over switch under the seat like my XJ?

I had several bad connections such as this in my ignition circuit. Test light lit OK, but volt meter showed big drop at fuse box and in a connection I had made, Also connectors on red wire under fuel tank were dirty...And of course the bad ground connection...

Just a guess, good luck wrenching, those mysterious intermitent questions can make you crazy

[Lonerider62]

It could possibly be bad conections at the kill switch or in the ignition switch and you should eliminate those if you can. But, I've also been thinking it might be some bad valves, either not closing because of 0 clearance or maybe bent or burned. I didn't see a reply to compression?

[shutchis]

Timing Advance

I checked the compression, 160, 160, 150, & 160. Then I replace the spark plugs and wires, no change; I hooked up vacuum guages to the intake manifolds, the vacuum at idle and at 4500 RPMs during the misfire & surging phases were steady and equal on all cylinders I check the voltage at the coils,13.2 at idle, and 14.2 at 4500 RPMs. I replaced the gas.

Team, I'm convinced the timing advance is not working. I'll pull out the good old reliable timing light and test this concept. We'll know something soon. Thanks for responding. I'll be sure to post my results. Stan H.

[natemoen]

If you don't figure it out please repost in a new thread. As you can see some have replied to the original 8 year old posts.