Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) Discussions

I suppose anything is repairable but would it be worth it. I can do the work myself & obviously I'd need to replace the 2 castings & conn rod & bushing, but what else would I expect to replace? crank, crank bushings, valves, piston, rings? Soon it may be up to the same cost as buying a decent used engine.

Opinions would be appreciated.

Cheers

Thanks a lot guys, I think I'll invest in a head gasket first, just so I can get a good look around. Then I'll try the penetrating oil on the valves depending how they look.
Friiy, your model number descriptions are correct. According to the docs I have, in the H series (horizontal), HH means cast iron cylinder. The one I'm looking at now is an HM100, so aluminum cylinder.
Maybe I should start a new thread & post some pics as I go along & share my discoveries with the other rookies.

Cheers

Another thing to check...

Check your headgasket, 

  If you pull the engine  over with the pull starter and you hear a chirpping noise ,  it could mean the head gasket is blown or the head needs to be retorqued....     ( mose likely the three bolts around the exaust valve loosen over time. 

Also, another way to check it is to squirt WD40 ( not a lot,  just a little to mointen things up ).. in the cylinder around the head area, put the plug back  in and try to pull start the motor..  the motor will smoke of course, so don't breath it in..  What you are checking for is bubbles around the head gasket where the wd-40 is squeezing out (Very small bubbles)

But listen for the chirp (do this without  Wd40 in the motor) , as you pull it over with the plug in and the engine set to off....

Also, don't forget to get a valve cover gasket when you get the head gasket....

Good Luck,

Friiy