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  #1  
Old 20th June 2018
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Default Galled front piston

Hokay I'm new to rebuilding engines so I just need to know what to do next ie how to fix.

It's to my 1972 with the cracked case; I'm disassembling so I can get the case welded.

Backside of front piston is severely galled and the front of the piston galled somewhat. The rear piston has just a little rubbed areas that don't look excessive to my inexperienced eye...I think I saw a Tatro vid where a similar condition wasn't the end of the world to him

The tops don't look much carboned at all, could that mean the pistons are newish and they were too tight?

They are stamped .020

[IMG][/IMG]

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Old 20th June 2018
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How do the cylinders look?
Rub a fingernail across them and feel what you feel to determine how bad.

Good you got those rags in there, keep 'em high and tight.
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there is some deposition of AL on the wall down low in the cylinder...but TBH I'm not so sure it's fatally gummed up with Al...you can def. feel it with fingernail and you can see it pretty clearly

[IMG][/IMG]

[IMG][/IMG]
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Quote:
Originally Posted by Gold Member View Post
there is some deposition of AL on the wall down low in the cylinder...but TBH I'm not so sure it's fatally gummed up with Al...you can def. feel it with fingernail and you can see it pretty clearly

[IMG][/IMG]

[IMG][/IMG]
Looks like a bore and some new pistons are in the future. Nows a time to be checking the lower "big end" of the connecting rods and bearings.

The depth of the lines gouged in the cylinders will determine the bore needed.
A good machinist can do all the work to bring it into tolerance.
Bore both jugs the same diameter, same set up.

I had always thought, taught or otherwise learned(it might be wrong,or might be right) that galling like that was from the piston being too loose in the bore, allowing it to rock too much back N forth..........more input from others ?

Have ye got the FSM or the FPM for the bike? It's a real handy item, more like a *necessary* item for the undertaking at hand,,,,,,,, just sayin', they're 2 of the most valuable tools in yer tool box.......well, in mine anyways.
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big time pinging from intake leak and crap gas will cause this
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yes I have the books
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Quote:
Originally Posted by SHAKY DAVE View Post
big time pinging from intake leak and crap gas will cause this
That's interesting...and just on one side of one piston especially?

Should be a doable fix for me on my own then...

yes I will check the big ends...
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If you have a bit of time, try cleaning up the cylinders to get the aluminum off them. Then hit them with a bar hone, you may get surprised and just need pistons & rings. Never just bore the cylinders, they don't make good ones anymore that I can find and good originals are like hens teeth.
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good info in my old thread...
http://xlforum.net/forums/showthread.php?t=1693277
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Quote:
Originally Posted by Gold Member View Post
The tops don't look much carboned at all, could that mean the pistons are newish and they were too tight?

They are stamped .020
I would be wondering what caused this to happen. At +.020 obviously they aren't original pistons. Where you the owner when they were installed? Do you know what the clearance was?

They have the look of a piston that was too tight or lack of oil . It's probably impossible to accurately measure now.

Just a note: Those aren't HD pistons. The pistons look fully machined and have anti-detonation grooves on the top land. They look like a Wiseco. If so they are forged, not cast. Wisecos often have their part number on the top.
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