Quote:
Originally Posted by George16
Once you get it running and warmed up, pinch the fuel line, count how many seconds before the engines shuts off. Longer than 4 seconds, the LSN is rich. Shorter than 3 seconds, the engine is lean. The LSN is set if the engine dies after about 3 seconds of pinching. Before the engine shuts off, it should rev up a bit too.
Before you do all these, check and make sure the idle gap opening is set between .7-1mm (about the thickness of a credit card or drivers license).
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Actually thats not what I was referring to, but thats another thing to do.
What I was referring to was the pinch of the cylinder. The sleeve has a taper towards the top to create compression since there isn't any rings. Get the motor hot and shut it off, then rotate the flywheel. You should feel a huge resistance towards TDC. If not, then it needs to be rebuild because it has no compression.
There are only a few things it could be causing problems. 2 strokes are very simplistic so it shouldn't be difficult to figure out. Only things it can be are the air filter, carb, glowplug, or the pinch (compression).
Air filter: Did you oil it? If so, you could have put to much oil, which can cause problems. Try it with no air filter and see if that helps.
Carb: this could be a number of things, but pretty much your only real possibilities are something like the LS or HS side could be clogged (highly unlikely), completely out of wack with the tune, or a cracked carb (again, highly unlikely if it hasn't been messed with). Another thing could be if it has a fuel filter, it could be clogged as well. Also check to see if there is air bubbles in the fuel line once you get it running (there shouldn't be).
Glowplug: Change the glowplug just in case. Its unlikely, but possible that its bad. It might allow it to idle, but then get put out when to much fuel is added. You can tell alot by the glowplug. It should be as clean as possible with a slight golden tint to it.
Pinch: As noted above, its very important to check the compression. If it has compression, don't worry about it and it shouldn't need rebuilding.
You need to do the basics first. New glowplug, new fuel line (keep in mind this is important since the one that goes to the pipe pressurizes the fuel tank so a crack in the line = no pressure, no pressure = no fuel), take the motor apart and clean it well (carb as well), clean the air filter and don't use to much oil, and make sure the nitro is still good.