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Wheels up

Xr 650 L problems

21 posts in this topic

Hello,

Well I was going like 90 mph on the highway the other day and my drive chain snapped some how and destroyed my airbox and nearly ruined my rear shock. That's no problem. Found the airbox on ebay and I fixed the shock myself. I put it all back together last night and now it WON'T start.

The chain did bind the motor and stalled it at high speed.

Does anyone think the motor may have jumped it's timing?

It's getting fuel and fire. The valves are opening and closing so the timing chain is still together. No blown fuses.

Please help me.

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lucky you didn't bust your left-side engine case ... $$$ ... I don't know if theyre commonly known to jump time, haven't heard of any ... pull your spark plug, ... bring the piston to its highest point, both valves will be closed, of course .. and see if the timing mark is at TDC .. good luck

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No breakage of the caseage. Glad for that. I havent checked timing yet but I will bet that I have a few bent valves. rrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr

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Check to see that the retarded kick-stand kill switch contraption isn't damaged.

I've put my finger in the spark plug hole (obviously with the sparkplug out) to see if it has decent compression.. Not very precise, but if air gets by your finger when forced down on the top of the sparkplug hole, while turning over the engine, then compression and valve timing are likely okay.

If your timing is off, you should still get spark when the engine is turning over.

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If I rememeber correctly, the engine won't even turn over if the side-stand is down and it is in gear. I also, obviously, cut off the spark. I threw that side-stand switch out within the first few days I had it back in 1996. Did your busted chain also hit the bottom of the battery case? The ignition electronics are pretty much all in that box.

If you are getting spark and have compression, you may just have a fuel problem.. You could try the carb cleaner trick while turning the engine over.. Wear safety glasses (a full-face helmet will do) in the event that your timing is off and it back-fires. I have to do this trick on one of my ATK's if it isn't started for a number of months.

If you have compression, and you have spark you only need that last factor.

In the event that the counter-shaft stops suddenly for any reason, the clutch will slip a little. You stand a better chance of ruining the tranny first.

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I never had my 650L apart so I don't know if it had a automatic decompessor you might look at the valves and make sure they all have clearance when it's at tdc on the comp stroke. Cam timing?

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Found out what the problem was. A piece of the air box that was destroyed made its way into the cylinder and wedged open one of the intake valves. The motor would not make any compression therefore it would not start. Replaced all gaskets and put it all back together and im flying again.

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Found out what the problem was. A piece of the air box that was destroyed made its way into the cylinder and wedged open one of the intake valves. The motor would not make any compression therefore it would not start. Replaced all gaskets and put it all back together and im flying again.

Bummer!! But still, I would have been happy with such a cheap fix while expecting the worst :naughty:

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The real question here is......what kind of chain were you using, mileage, age, etc?

Hayden

94 L

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Don't forget to pull the exhaust packing & clear it of dirt/debris. It'll feel sluggish & hesitant on the take off if junk made through . Also check the metering rod orifice & various nooks & crannies in the carb flow path for junk.. You know like filter foam & oily slime if the element was compromised. Better to find these things out in the garage rather than out along the road somewhere.

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The real question here is......what kind of chain were you using, mileage, age, etc?

Hayden

94 L

Actually it was a good D.I.D chain. X-ring. 350 miles on it. I think it was a freak accident. :naughty:

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