2 stroke engine pull start string turns back tire

Try aiming the handle bar straight and pull some kite string across the rear wheel , lightly touching the sidewalls of the tire. With the length of the string pulled across the front tire, adjust the outer tie rod so as to make front tire lightly touch the string. That should square the front tire to the back tire. Once the front and rear are squared, adjust tie rod in 1 turn for a slight negative toe. Do both sides while making sure to keep the handle bar straight during string and adjustment. That should help.

When you remove the spark plug is it very wet?
after the plug is removed when you pull the cord sharply does liquid come out from the hole?

there are no tires on chain saws.

What turns it when on the ground or on a stand, centrafugal force, and clutch.

Hi Mark
Perhaps a bit late now.... Just spotted this so I imagine it's all fixed by now.
But for others with this sort of problem.
Assuming the pull cord is not broken, stuck or tangled. Switch off or short plug to ground, for safety then remove the spark plug to allow the engine compression to escape. You should be able to turn the engine over really easy with the pull rope, otherwise the engine might be seized or the rotary pull mechanism jammed.
Also... can the shaft to the string line be rotated as in the crankshaft of the engine.
Good Luck

yes i had one put on through honda in melbourne

Make sure the air cleaner is not plugged. Turn both jet screws CW to stops (lightly), then back each out 1-1/2 turns CCW. This is a basic setting and should allow the engine to start and run. When the engine is warmed up, pull the throttle full on and adjust H jet needle CW until the engine starts to speed up, but still 4-stroking. Correct adjustment is when the engine 4-strokes running free, but immediately 2-strokes when cutting. Release the throttle and allow to idle. Turn the L jet needle CW until the engine idles fairly well, but the engine should 'follow the throttle'. It will tend to 'gasp' when pulling the throttle if you have gone too far. Idle speed screw should be set so that the chain doesn't try to turn, but the engine continues to idle. Hope this helps!

Check the fuel lines for hardness, cracking, splitting, or end rot. Check the muffler for plugging. Check the carburetor fasteners for tightness. Are you using fresh fuel mix? If the carburetor jets have been adjusted, try turning both CW to stops (lightly) then back out each CCW 1-1/2 turns. Engine should start and run--allow to warm up. Pull the throttle full on, and adjust H needle CW until the engine starts to speed up, but still 4-strokes. Proper adjustment is when the engine 4-strokes, but immediately 2-strokes when cutting. Let idle and adjust L CW for fairly smooth running, but still allows the engine to 'follow the throttle'. Hope this helps!

Nothing will do this...what is most likely the problem is either the recoil is going bad or you have the wrong spark plug installed.