Has plenty of gas and oil, i have checked the spark plug and air filter...but it just wont run at a fast speed.
are there any adjustments that can be done to the carborator that will increase engine speed?
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I had possibly the same problem with my lawn tractor about a month ago... I tried removing the carburetor and cleaning it, but I always ended up pushing debris into another area and creating new problems. Eventually I just bought a new carburetor, changed the oil (some gas had gotten into my oil thanks to the problems I had with my carburetor), cleaned the spark plug, emptied the oil filter and replaced it, checked the air filter ((no oil there, phew)... and it seems to be running fine after 3 engine hours (knock on wood).
My backstory is the lawn tractor was sitting in the garage with our car for two years and not used. I prepped it for long term storage, but failed to drain the carburetor of old gas, so the old gas gummed up the works (even with fuel stabilizer). When I did get it running (after changing everything listed above) a lot of smelly white smoke kept coming out, but as I let it idle in fast speed the engine strokes became more regular and the bouts of white smoke became fewer and shorter until the smoke stopped altogether.
Sounds like you have a compression problem. Starting fluid will fire at a much lower compression than a gas/oil mix so that's why it will start with it. When the motor is running you get a little more compression because the piston is coming up so fast. You should check the condition of your cylinder wall and piston & ring. If they are damaged at all you loose compression which directly affects starting and running power.
Check you're catalytic converter, Dont know how fast 40-60 KPH is but if it is near 40 miles per hour and has no power up hill that would be the first thing I would check. second would be Fuel pump... Hope this helps
Make sure the muffler has not become plugged. Check the flywheel key as it may have sheared off for some reason causing the timing to be off, yet still generate sparks. Are the sparks blue and snappy? If not, check the ignition module gap to the flywheel magnets--use a thin business card for a gauge. A wide gap can cause weak spark. Hope this gets you running again!
Ckeck the spark plug cable and make sure it is tight on the plug. You did not say what kind of mower but some have low oil shutdowns. Make sure the oil is up to the full mark. If neither of these items solve the problem check the spark. If there is good spark remove the air cleaner and squirt some gas into the carbburator and try to start. If it runs then dies you know it is a fuel problem.
Since it ran fine before you "fixed" it, go back over the things you changed. Put the old spark plugs back in it. Double check all spark plug wires and ignition connections. Put the bike in a dark area and run it at night, can you see any arcing anywhere?
Check the spark at the plug,the compression and carburation.Check and clean the gas and air filters.Disassembly thr carb and clean it with compressed air.Change the gas from gas tank and start the engine.