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Mike could be a few things for no spark on your bike, blown fuse if applicable, short in ignitions wiring, bad switch, CDI module, pulse generator, coil, plug, plug wire, etc. You may have to get yourself a good manual, DVOM and start checking. Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info." 1984 XR500R RUN 2 1 2 Steps to Take When Your Motorcycle Won Start Dennis Kirk Powersports Blog
It is called Hot coil trouble, but coil doesn't necesarlly need to be hot to fail. It might be hot internally and cold to the touch.
This symptom is caused by excesive resistance on the high voltage side of the coil. When the coil works harder trying to send the current through a high resistance path to the spark plug, it gets hot and quits. There must be a bad connection or a damaged conductor between the coil and the spark plug's ground contact at the screw threads.. Even a too large spark plug's gap could cause enough resitance to cause coil failure. Corroded terminals o broken HT spark plug wire can cause it too. Have you recently replaced something in the high voltage circuit? Check it out. Good luck!
There is many options to cause this, spark plug failing, dirty carbi, but the most common cause for this would be fuel mix itself (what fuel ratio are you using?) Try decreasing the oil in your fuel mix slightly see if this improves then move to carbi inspection / full clean and new spark plug
1. Leave the bike alone, do not retry to start when that happens.
2. Make sure the reserve petcock and choke is set open when starting the bike.
3. Make sure battery is in top fully charged condition.
4. If you have not run it for a long while, then have the carb cleaned as the jets maybe sticking due to dirt built up and fuel line clogging.
5. Make sure your spark plugs, plug wirings and coil are clean and in good conditions
6. Have your ignition timing chain checked and ensure is set properly.
7. No air leakage anywhere before or after carburator lines.
8.Think that is the main cause, now try again. Cheers
Failed spark plug(s). Replace both spark plugs for the misfiring cylinder - or better yet, all four spark plugs.
Moisture trapped inside the spark plug caps. Pull the spark plug caps from the spark plugs and spray the inside with WD-40 to remove the highly conductive moisture (WD-40 is non-conductive). Inspect the caps for cracks or carbon tracking (lines of carbon left by electrical arcing, looking like pencil markings). Replace the caps if cracked or carbon tracked.
Contaminated fuel. Loosen the carburetor drain screw on the bottom of the carburetor. Catch the fuel in a clean container and inspect for signs of dirt, rust, water, etc.
start by checking for fuel, and spark, if they are good, then turn the idle screw all the way in, slowley and dont force it, once you got it in all the way then turn it out 3 full turns, as this is a good rule for the idle on first start after a rebuild. if thats not working then check the engine for good compression, you'll need to contact the dealer and ask for a cyl compression spec. If thats the problem the engine will not start no matter how much you tweak it, it will have to be rebuilt. good luck
a four stroke will pop and backfire under decelleration when it is lean, or not enough fuel. (Jetting too small in the carburator) But, look at the spark plug for color, white is too lean, black is too rich, and chocolate is just right. Make sure the air filter is good and clean. And lastly... have the valves been adjusted?