Not enough compression to spray thompson water

You did not mention the ignition coil? Check fluids - Did the car over heat or anything else like low oil etc...? Other common problems - Head gasket - water in oil or vice versa / bubbling observable in radiator water, burnt out valves - no compression (compression test), top end wear - rattle type noise, bottom wear - symptom knocking.

Using "Easy Start" or other ether based engine starting aerosols will damage the engines in the long run, reducing compression due to engine wear as the aerosol removes the oil traces off the engine bore and stripping the aluminiun from the pistons. If it were an old diesel engine, not a problem.
Check your petrol mixture settings and compression. As if the compression is low it will be hard to start.

Be sure to filter the paint you are trying to use so that you aren't dealing with large lumps of paint. You will need to experiment with hose pressure to get proper spray quality, and set the mixture control for a fairly fine mist as the paint is likely to be more fluid. Fan control is set so that you don't get an unpainted space in the middle of the paint swath. Make sure to wash the gun thoroughly after painting. If you are doing a lot of painting, expect some nozzle wear over time as the water base paint is somewhat gritty. Don't forget to trigger 'off' before the end of each stroke and trigger 'on' after starting the return stroke to keep running at a minimum. Good luck!

70lbs for a 90cc should be good, but 80-85 is better. Compression drops from piston rings wearing out, most of the time. Piston rings wear out from old oil...every time. Rule of Thumb: 5 tanks of gas, change your oil !!! It's not a car !!! A car has 5 quarts of oil which takes about 3 months to break down (2,000 miles or so), 90 cc engine has a half a quart, which takes about 3 weeks to break down (based on everyday use) SO...5 tanks of gas, change your oil..

as for the not starting thing, check for spark (should be a blue spark ONLY, any other, replace plug, orange won't ignite gas) if you haven't been riding for a while, open the drain screw on the bottom the carburetor and drain the water out. Ethanol turns to water when the gas sits too long...

You should be able to adjust the spray pattern to clear this up. You may also give it a good cleaning with mineral spirits as well as making sure that the paint is thinned enough

I have had that happen to me you need to rebuild the diaphragm to **** up the paint.


Good luck

I would recommend a leak down test to distinguish if the low compression was due to ring wear or an issue with the valves/seats...cylinders bores dont just wear out from sitting.
It's very possible that the valve seals were worn allowing crankcase oil to seep into the combustion chambers, thus causeing it to smoke. Being a 3 cylinder water cooled engine it should not have an overheating issue to cause the rings to stick...unless it was neglected, and not regularly serviced, debris in the oil filter, low oil pressure.. sludge from worn out oil. A good clean air cleaner is important...bad filtration will cause premature engine wear. Install a K & N high flow filter... and your good for the life of the bike.
Hope this answers your question...good luck with your bike.

Don't use a rubber mallet! It shouldn't take that much force! Make sure the piston ring is compressed enough so it will fit inside the cylinder as you slide it down over the piston. Be very delicate! It doesn't take much effort to break a piston ring or screw up the crank bearings. Just take your time and make sure everything is lined up and extremely clean.a thin coat of 2-stroke oil on the piston, rings, and inseide the cylinder will help protect everything - just make sure you're working in a clean environment where there's no dirt and grime for the thin coat of oil to attract.

Well for starters, that oil has to be going somewhere, obviously.  So most likely it is the piston rings, these wear out over time regardless of how well taken care of your car is.  Check the exhaust out while the car is running, if there is a white-blueish smoke, thats piston rings.  if it is more grey-ish, thats most likely a head gasket, in which case check the coolant overflow for color, and remove the oil filler cap and look on the inside, if you see a nasty looking white film, thats caused by water/coolant in the oil, most likely leaking through a bad head gasket.  Or it may be leaking out somewhere, if there are no puddles it may be leaking near a hot exhaust pipe/manifold and burning off.  
As long as you keep enough oil in it, it should be fine for a few years, just get it fixed eventually.  in the mean time you can also use oil additives to help string things along, ask the rep at your local auto parts store.  hope this helps!