hey, i have a 1992 yamaha waverunner 500cc, it's a 2 stroke motor. My problem is that the engine will not turn over with the spark plugs in the cyl head. if i take out the spark plugs and engage the starter it turns freely. i took out the starter and hook it up and it turns and seems to be working fine, but when i put it back on the engine(under load) it will not turn the engine, but like i said earlier if i take out the spark plugs and remove the compression it tunrs freely. any ideas?
battery is brand new.

why would a 2 stoke have spark plugs? perhaps the battery is weak and cant put out enough current under load

i guess the easy answer to that one is that the mixture wont combust without a spark to ignite it.... its a two stroke gasoline burning engine and not a diesel,

your battery is weak, and thus not able to deliver the amps nessecary, replace the battery and go sailing...

eheh, nice to feel like a dip**** i was thinking about little 2 stroke nitro 1/4 scale model engines that combust under their own compression. dont deal with any 2 stokes otherwise lol.

i figured you were thinking about some two stroke diesel engine and posting before thinking it all the way through, it happens to everyone..

Try to clean the starter. The stator may be dirty with carbon and be weak on voltage on the magnets.

__________________
Luv the smell of NITRO in the morning.