fouled plugs on 99 gsx-rfi

[bighvygsx]

rode for an hour and it had good power, very fast for a 800cc engine. its my first one. running good then all of a sudden (after an hour of riding) i could barley get to the dock at wot no power and very hard to start.(when i first started the 12v low was flashing. i had battery check at parts store and it checked good. trickle charged it before going out. after changing plugs on the shore it never came on again) just finished break in and changed plugs before i went out. so i changed the plugs on shore and it went back to running fine. the front plug was black and dry, and the rear was black and slightly wet. after changing it we ran another 3 hrs. of start and stop riding and it was fine. this is the second time it has happened. last time it happend i put it on the trailer and started it out the water and it seamed to clean it out.

 

[seadoolover]

You Got A Problem With Your Chargin' System.

 

[kustomkarl]

Check the charging system and go from there.
When the engine is running, set your voltmeter for 20 VDC and put the leads on the correct terminal posts. With the engine running, you should be reading anywhere from 14.5 to 14.8 VDC. (typically this test is done at 5,000 rpms) This tells you your charging circuit is good. If the voltage is higher, the regulator is bad. If you’re not showing a charge and you've replaced the rectifier, you may want to do a test on the Magneto/stator/charging coil. If you’re not a premium member and you don't have access to a manual, this test will be hard to do without it. There are 2 fuses that protect the charging system. Check the 15 amp fuse in the MPEM and the 15 amp fuse between the solenoid and the MPEM.

The magneto and stator create un-regulated AC current. The "rectifier" converts that AC to DC current and the regulator maintains the current between 14 to 14.5 volts DC for the engines operation and charging circuit.

Karl

 

[safoneo]

Had similiar issues on 97 gtx

I have had almost the same thing happen on mine. I just charged the battery and replaced the plugs and cranked it using a hose. It fired up and ran for a little bit...got it up around 6000rpms and then as it settled back down it stalled and would not crank. Both plugs were wet and one was completely black. I cleaned them off and put them back in. Nothing. It doesn't sound like it's firing at all. Charging system or running too rich? I dunno! Did you figure out your issue?