1967 250 Harley/Aermacchi Sprint SS

Yesterday we sprayed the cylinder with Castle Thrust. With a little coaxing from the dead blow the piston came out quite easily.
 

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I cant believe how good of shape that bike is in.. What did you end up paying for it, if you dont mind me asking?
 
Luugo86 said:
I cant believe how good of shape that bike is in.. What did you end up paying for it, if you dont mind me asking?
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priceless


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Pulled the piston and here is a quirk with the Aermacchis the manual says you have to heat the piston up to 250 degrees...and you do :)


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Texasstar said:
Pulled the piston and here is a quirk with the Aermacchis the manual says you have to heat the piston up to 250 degrees...and you do :)


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Why ?
 
Found these modifications to take care of oil leaks for the Aermacchi on Tony Foale's site http://www.tonyfoale.com/AermacchiEngine/pushRodTunnel.pdf


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Piston and cylinder starting to clean things up to get some measurements.
 

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Was the reason for heating the piston related to removal of the piston pin?

Interesting piston valve recessed area... are the valves domed also? Reminds me of tulip sodium filled valves on big arse airplane round motors. If they are domed; pics please :)

http://2.bp.blogspot.com/-zusiAP9RAWM/UQsg39m2sbI/AAAAAAAAASk/RhPy_qMQHZA/s1600/Picture3.jpg

Cheers
 
Q said:
Was the reason for heating the piston related to removal of the piston pin?

Interesting piston valve recessed area... are the valves domed also? Reminds me of tulip sodium filled valves on big arse airplane round motors. If they are domed; pics please :)

http://2.bp.blogspot.com/-zusiAP9RAWM/UQsg39m2sbI/AAAAAAAAASk/RhPy_qMQHZA/s1600/Picture3.jpg

Cheers
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Yes on the piston pin and I wonder if it because these Pistons are forged??? I will let you know on the valves taking them to get serdi cut tomorrow. I will take pictures :)
 
Here is an example of the records he kept and the last time it was bored.
 

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Dropped the piston and rings in some chemdip for a couple of hours to remove the carbon.
 

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Q said:
Was the reason for heating the piston related to removal of the piston pin?

Interesting piston valve recessed area... are the valves domed also? Reminds me of tulip sodium filled valves on big arse airplane round motors. If they are domed; pics please :)

http://2.bp.blogspot.com/-zusiAP9RAWM/UQsg39m2sbI/AAAAAAAAASk/RhPy_qMQHZA/s1600/Picture3.jpg

Cheers
Click to expand...
https://youtu.be/06KHk_hNNu8

What do you think Jack about these valves? Check out the oil grooves on the stem!
 

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Aermacchi Valve seats after sitting for 30 years
 

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If you decide the horribly damaged badging on the tank is just too much and you find a better example... I got DIBS on this one ::) ::) ;D!!!
 
I was not expecting the dished valve. There are several examples of dished vs flat valve explanations on the web. Here are a couple samples; reasons include lowering compression to improved intake performance.

Thread #16
http://honda-tech.com/honda-prelude-4/flat-vs-dish-valves-1901436/#post26498770

Thread #7
http://honda-tech.com/all-motor-naturally-aspirated-44/lets-talk-about-flat-faced-valves-dished-valves-2928785/#post45162070

Got me on this one.. I was expecting tuliped :)
 
Tune-A-Fish said:
If you decide the horribly damaged badging on the tank is just too much and you find a better example... I got DIBS on this one ::) ::) ;D!!!
Click to expand...



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Ran into a an Italian hick up with the serdi cutting..the need a .296" pilot going to do some research. However everything is now bead blasted. Harley by name Italian by disposition.
 

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