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The grounding wire that grounds the engine frame to the negative side of the battery may have broken off where it connects to the block. You have to take the red metal shell off to get to it. You can easily check this with a piece of wire ( I used one wire from a set of jumper cables). Clip one end to the grounding lug on the side of the generator, and the other to a bolt on the engine block. See if it starts. If it does, you need to fix the grounding connection. I used one of the braided ground straps that you can get at an auto parts store.
The engine/generator assembly sits in there on rubber motor mounts, so it needs to have a way for the ignition to be grounded.
Sorry but they either work or they dont.
If yours isn't working, replace it.
But before you replce it consider checking the other components, because ign mods are exspensive.
it sounds like you've been already checking the other stuff. heres what i'd check if your bike came to my shop.
1. battery fully charged, and can take a load. (weak batteries = weak ign power)
i have a bike that won't fire at all with weak battery. Make sure battery is good.
2. check for spark at plugs, make sure plugs are good. Pull plugs and turn motor over.
rest plug next to head and turn over, do not touch the plug while turning over
or you can be shocked.look for spark.
if you have spark , then you ign mod is working.
if no spark, then check #3
3. power to coils. check the power going into coils,
if power but no spark, then coil is bad.
if no power. check #4
4. power to coils comes from a ignition system ( points/ cdi /ign. module)
there is a stator and a rotor. and a signal generator. on your motor
the signal generator wire sends a signal to the cdi, every time the rotor rotates.
the ignition system (ign.mod) sends power to coil.
so if no signal to the cdi, then signal generator is bad
if signal going into cdi but not sending the power to the coils then the cdi/ ign. mod is bad.
The rings are stuck to the cylinder wall. Remove spark plug and spray some pb blaster in the hole. 3 or 4 seconds worth. Let sit a day then try. If no go repete. You can pry on the flywheel if yiu know where not to. Take your time Rushing it may brake the rings.
the worst thing for generator and compressors are to sit up. when you do sit them up put stabil in the gas. run it and then run the gas out of the carburator. now, make sure the gas in the tank is good and has no water or trash. check the fuel line that it is in good conditon and not plugged. pull the carberator and clean varnish out and clean jets. soak it over nite in varsol or parts cleaner. check to see if you have a low oil shut off. oil level must be correct. check your exhaust to make sure it isn't plugged. some have a little screen that get coated with carbon and won't let it exhaust.( fuel in, spark, exhaust out)
Well, only 2 things, is it getting gas?? Is is getting spark?? Squirt some gas down the cylinder and see if it will fire. Yes? No? If it fires, but won't run, the carb is messed up, or the fuel is not going to the carb. Then check the spark with the plug resting on metal and connected to its wire. If you have no spark, that is what you have to chase down. Sometimes these things sit and the contacts on the alternator rust over, (iron) and don't develop any juice, they have to be cleaned, the coil could be shot. The Carb might have been cleaned, but is it clean? Those jets are finicky. And gas that sits turns into rock. Check it out. Hope this helps.
A lot of times, things like this sit, too long, and the gasoline turns into turpentine, real thick and gooey, will not go through jets, If you can drain the bowl on the carb, there might not be one, but, try to drain the line if you can, you could drain the whole tank while you are at it, because it is probably no good either. Put in some fresh gas, give the cord a yank and see what happens, if it starts and sputters, rev it up and try to get the fuel moving. It might clean itself up, It might need to be taken apart and cleaned out. Hope this helps, Let Fixya know if it does.