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Topic Review (Newest First)
05-20-2015 09:14 AM
amc49 Is the head of the piston beat up with dents?

If not was engine repaired for this before?

Where is the crack located on the piston?

Skirts (the sides) can crack just from running too loose, the flopping about hammers on them to crack. Someone doing an earlier rework could possibly hone a bore too much to make it loose and the crack then. Maybe even left a cracked one in there. People do silly things all the time.
05-19-2015 05:45 PM
Gearhead068 I was wondering I have somewhat of the same problem but the seat didn't drop out of the head but yet the piston is cracked on #1 what could have cause that
06-09-2013 04:12 PM
p58ff Related question:

What size are the studs for the exhaust manifold to cylinder head and where can one get them?

I'm in the middle of replacing the cylinder head/piston/rod due to a dropped seat.

06-06-2013 12:42 AM
amc49 It works, half the time I have no ring compressor either, it gets interesting trying to get pairs in cylinder at same time on like an inline four bike. But I get it done and never have broken a ring ever.

But then I assemble ATX clutch packs without any of the special tools to install pistons too. Gotta be careful and inventive.
06-04-2013 08:01 PM
ImBillT It's probably frowned upon, but I always installed new pistons in lawn mower engines by hand. I quickly found that was not going to be a simple task on the focus, and didn't wanna drive to the store for a ring compressor. I took the old timing belt and a pair of vice-grips, and the combination worked quite nicely!

Not trying to thread-jack. It's mildly on-topic and I thought it might be a helpful hint.
06-03-2013 09:17 PM
amc49 There you go, be inventive, or how to cure practically anything.
06-03-2013 10:44 AM
ImBillT Wrapped plastic trashbags around the crank so I could wash the cylinders out without washing grit all over it.
06-02-2013 05:22 AM
amc49 Put a towel over the crank. I'd even consider not honing if motor is old especially if you still have honing mark left. Maybe 400 sandpaper taken to bore. Take a razor blade and carefully scrape the carbon ring at top of cylinder off and often no need to remove ridge, these motors wear very little. Once cap is off rod, tap on rod bolt to move rod up a bit and then use upside down hammer handle located in the middle of the rod curve for bearing to fully remove piston/rod. Depending on how hard it is to get piston out you don't want to be pushing on bolts by then, you can knock the bolt out and don't need to do that.
06-01-2013 06:41 PM
ImBillT Are you guys honing the cylinder with crank still in it?
05-27-2013 06:50 PM
Originally Posted by TheGlassMaker View Post
You don't need to unbolt the engine mounts to pull a piston.
One of the passenger side engine mounts has to come off to pull the head and timing cover right?
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