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f you didn't already try to replace the plugs with new ones i would start with that. Remember that you have to touch the spark plug to metal to test it out. Other wise it will not be properly grounded and will not spark. They could have to much carbon build up on them or the gap could not be properly set or worn down. I assume that you have already tried this so the next thing i would do is find a wiring schematic and follow the wires from the battery to the primary coil and make sure that the coil is getting a good flow of electicity. If you are not take you volt meter to each wire the positive and negitive and make sure you dont have a break in the wire. Also check and make sure that the ground itself is not loose. if that is fine move to the secondary coil and do the same thing. Then finally check the wire that goes from the secondary coil to the spark plug. If you can give me the year make and model i might be able to find you a wiring schematic. I hope this was helpful, Feel free to email me at email@example.com if you have any more questions. Aj Weaver
There are 3 components necessary for any motor to run-fuel, air(compression) and spark. Just because you have new plugs doesn't mean you have spark. Put them in the caps and ground them to the cylinder head and turn the motor over and look for the spark. If you have spark, install the plugs and plug wires, and turn it over several times. Pull the plugs and check to see if they have fuel on them. Run these 2 simple tests and get back to me with the results and I'll help you further. Good luck!
Drain the carb if you haven't already, be sure the gas valve is on and the plug wire is attached, check for a kill switch in the wrong position, then give the air intake a shot of spray starter fluid. Hopefully that will get you going again.
Check the compression, pull the spark plugs one at a time if more then one. If you don't have a compression gauge, you can put your figure over the spark plug hole, be mindful that before it blows it's going to **** so make sure that you don't hurt yourself leave a little gap so your figure doesn't suction down to tight. If your getting compression it should **** and blow pretty hard. If it seems to have good pressure and suction. You might need to check your timing, also make sure that you can feel air moving out the exhaust, might not be able to with the pipes on it but if it won't start and your getting everything else it needs to run gas,spark, etc. It has to almost be timing or compression.
If your XR600 has ever sat for more than just a few months, there's a very good chance that the carburetor is plugged with fuel varnish. This means that the carb will have to be disassembled and cleaned.
A big four cycle engine like your's may "feel" like it has good compression, but it may not have what it takes to start and run. Check the compression. With the throttle wide open and a few good kicks of the starter, you've got to see at least 140 psi of compression. Anything below that and it isn't going to start or run reliably. If the compression is low, the first thing to do is re-check the valve tappet clearances. Insufficient tappet clearance will cause low compression. Also make sure the kickstart-actuated compression release is not hanging up and causing compression loss after the kick start lever is returned to its parked position. If the valves are properly adjusted and the compression is still low, then internal engine repairs are needed.