Need Help Please Guys

[QuadDad22]

Picked up a 86’ LT 185 for $10 in trade value(my items only cost me $10) 

recoil only , I pull the recoil and it won’t move , so I took it off , I can spin the crank there one full turn left then it locks up , and one full turn back to the right and it locks up

pulled the plug , the piston is moving up n down , both valves are moving(pulled the caps) 

pulled the clutch off , oil pump gear , and it still locks up after one turn 

 

any ideas or where to go from here would be greatly appreciated 

im a 2 stroke guy so this all is new to me 

 

thank you in advance y’all 

[Gwbarm]

Does it stop hard or just get harder to turn, if it stops hard something has come loose inside the engine, it could be a loose rod bolt stopping it but still attached enough to roll over the piston, just one senario, something could be wrong with the clutch gear stopping it, i would try taking off the side covers first and see if everything is in tact there and see if any thing is going on there, regardless good score. I think you will definately get your 10 dollars worth.

[QuadDad22]

Both side covers are off , clutch is off , oil pump gear is off , it turns one full rotation both ways then stops , there’s a click it sounds like in front then it stops 

 

I’m new here , can I post a video of it ? 

[QuadDad22]

Pretty sure my valves are stopping the piston , means I’m 180 out ? 

[Mech]

Check the cam timing.

[Gwbarm]

You should be able to tell if the valves are hitting the piston with a bore scope.

[QuadDad22]

No need , I can literally see them do it through the carb inlet 

Tearing the head off in the morn 

[Gwbarm]

Is the timing chain in tact, it must be broken for that to happen

[Mech]

They can jump a tooth on the sprocket, especially common just as the engine comes to a rest after being shut off. Caused by worn sprockets or chain, or a defective tensioner.

[Snick]

Maybe cam chain failed? See if valves moving when you turn engine by hand.

Edited September 16, 2024 by Snick