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Hi, I seriously need help.

I bought m Kawa ZL 900 Eliminator last summer and I could have drove it only few times because of mechanical problem that no garage arround here can troubleshoot.
I'm in fact an atomotive mechanic but this motorcycle is driving me crazy and I try to find the exact problem so I won't spend any more money for nothing.

Whats happening is that the bike runs like garbage when it gets at his working temp. (Misfiring, buckling, and exhaust back fire **Big one!)
I brought it to a specialist and he decided to ultrasonic clean carbs, replace cam timing chain and gears, ajust valves, replace coil pack and even CDI.
after done that, the bike started like brand new but samething, when it gets hot, averything start again; extrem exhaust back fire, it idles great but can't open the throttles a bit that it buckles and has no power at all. Intrestingly, it happens at the same time that the cooling fan starts...

I'm thinking maybe about overheating problem? But it runs clean afterall, no smoke or bad ordour..
Valve bad timing when it gets hot? What can I do?

symptoms(Only when it gets warm, When its cold it runperfect):

-Back fire
-Lost of every power
-Hot

Please help me to know where to aim at...!!


Thank You for your help
 

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Moderator - Loves All Motorcycles
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It definitely sounds like overheating to me. I had a scooter that had similar behaviour when it got hot. I was out in the field when it exhibited those problems. I then sold it after the rally, so I was never able to truly fix it.

I'd take a heat gun and point it at the engine when it starts backfiring, see if the engine is above operating temperature. Sometimes temperature gauges can be inaccurate.
 

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I find it interesting it starts acting up right when the cooling fan comes on. Sounds like something is wired up wrong.
Perhaps someone wired the fan to the hot wire on a coil?
 

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Moderator - Loves All Motorcycles
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Oooooh that could also be a possibility. Something shorting out when the fan comes on, causing misfires?
 

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Cap off the hot wire for the fan. Run a wire from the battery to the fan, (with a fuse and a toggle switch in the line).
Start the bike, before it gets hot, flip on the fan with the toggle switch. Does it act up or keep running okay? Ride around the block, if you think it will make it. Let us know what happens.
 
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