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Yak
Vacaville, CA
USA
2 Posts |
Topic started on 01/03/2012 at 3:22:20 PM
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| Hello all! first post, OK here's the rundown, 95 L, 9800 miles. Bike has White Bros E series muffler with 10 discs, foam filter, 120' +/- elevation. I did Daves mod with 55-160 jets. I rode it for a couple of miles and ran perfect. Trailered it up to the Mendocino NF for a camping trip ran ok when hot but hard to start and stalled a lot until warmed up. Got home tried to ride it and it was bad, backfiring like crazy, stalling-hard starting. Took the carb apart, clean as the White House bathrooms, plenty of fuel, no clogged tank filter. Re jetted the carb with 58-158 jets, same deal if not worse, Starts right up when cold with choke, 5 seconds later, stall, cant keep it running, gunshot backfire, wont start. I killed the battery trying to get it going. One thing I noticed was the 58 jet was quite a bit shorter than the 55 I took out, it doesn't fit flush anymore. No obvious vacuum leaks but there is a small crack in the insulator, but I doubt its that. I haven't checked the cdi, I cant spring for a new one right now and I don't know anyone that rides a motorcycle near me let alone find one to borrow. The other thing I haven't checked is the valves, the P.O. supposedly had them done recently, would a 120 mile trailer ride throw the valves out? I doubt it. So my question is, WTF? I've had two Ls and a 600R before this one and never had these issues. Im sure you guys are tired of reading posts asking whats wrong but any help or suggestions would be appreciated. Mods please move this if its not in the right forum |
95 XR650L |
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Yak
Vacaville, CA
USA
2 Posts |
Posted on 01/03/2012 at 4:45:53 PM
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| I don't suspect the cdi but I banged, put it back, checked fuel, still plenty of flow, sprayed carb cleaner on boots, no vacuum leaks, and fooled with the idle speed, runs longer before stalling and no more back fire but still stalls after a minute or so and I have to wait a minute or so before it starts up. I'm going to check the valves but I don't have those fancy two way angled feelers and might have to order them. There is a ticking at idle (sounds like an exhaust leak but its not) that seems to go away as I rev the motor, Im not sure if its a bad plug wire or what |
95 XR650L |
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dave_cl
Central NY
USA
1404 Posts |
Posted on 01/04/2012 at 09:28:56 AM
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Could be fuel, or spark, or less likely the safeties. Less likely to be the valves if when it idles it sounds good.
Maybe try putting a smear of silicone over the crack in the intake adapter.
Maybe it gets fuel, but at a very slow rate?
Get it started, run it until it dies, then quickly shut off the petcock, then drain the carb and see how much comes out- should be the same as if you let it sit for a few minutes with the gas on, then turned the gas off, then drained the carb.
If it is the CDI (not really acting like it though) often beating the CDI a bit will make it work.
You can temp bypass the safeties by grounding both wires that go to the clutch lever switch on the bars.
Dave |
01 XR650L - Keihin 158 main jet, 55 'long' pilot jet, screw out 2.5 turns, stock needle shimmed 0.035, slide holes drilled to 5/32, dynojet shorter CV spring installed, foam filter, snorkel removed, stock exhaust, air pump removed, thermometer dipstick, XCMH fr/r tires, 14-48 spkts. |
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Poor running 650L
