19 thoughts on “PART 1 “THE TEAR DOWN” STIHL TS 420 TOP END REBUILD

  1. Hi mowermedic1, if it's noticed that compression is weakening would it probably be due to worn rings and would it be good practice to renew at this point and avert total engine failure

  2. Do you think the piston just broke on its own or was there too much carbon in the exhaust port that took out the piston ring ?

  3. in part 2 i am gona go over failure causes and talk about mixing oils and carbon build up…..i honestly think a flake of carbon dislodged from the top of the cylinder or exhaust port and got lodged between the piston and one of the ports…but the main cause was dirt injestion

  4. IF YOU ARE REBUILDING THE ENGINE THEN YOU WOULD RELACE THE BEARINGS, ELIMINATING THE NEED TO GUESS HOW MUCH PLAY IS TOO MUCH PLAY…..THEY ARE EASY TO REPLACE…JUST POP THE KEEPER OUT OF THE PISTON AND SLIDE OUT THE WRIST PIN AND INSTALL THE NEW BEARING

  5. hey jeremy great videos. i am attempting to rebuild my TS420. I have about a 1/4" horizontal play with my connecting rod, is that normal, or okay to put a new piston and cylinder on? another video that i watched said that there should be no movement on the crankshaft rod, and if there is then that can cause the piston to rub more on one side of the cylinder causing it to burn out faster. i dont want to replace crankshaft obviously. i tried and having a hard time getting that out. suggestions??

  6. Laughed my arse off when you turned that machine up side down & spilt fuel everywhere.

    I do the same damn thing!

    I hate these machines – sorry sthil fans these saws are garbage.

    Find an old TS400 and keep it well maintained.

  7. Hi Sir, could you please draw out the fuel line system? I bought a second hand ts420 and all the pipes had been taken off.
    I don't know how to put it back, so please help me. Cheers

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