pison hits cylinder head

Bill 49

New Member
Joined
May 21, 2020
Messages
3
Iv just fitted a new pot piston and cylinder head and when I turn it over with a spanner the piston is hitting the head will a second head gasket be ok
 


Wrench

Well-Known Member
Joined
Nov 14, 2018
Messages
1,628
Better to use a thicker head gasket than 2 thin ones. But sure slap 2 head gaskets on and see how she runs.
You also can add another cyl base gasket. But by doing that you might have to adjust your piston ports.
 

GreasyChris

Well-Known Member
Joined
Jan 3, 2019
Messages
1,300
Sounds like you might have the wrong piston. They come in a low hole and high hole version. Sounds like you put a low hole in place of a high hole. Compare the wristpin hole between your new piston and old one and you may see the difference
 

Bill 49

New Member
Joined
May 21, 2020
Messages
3
Sounds like you might have the wrong piston. They come in a low hole and high hole version. Sounds like you put a low hole in place of a high hole. Compare the wristpin hole between your new piston and old one and you may see the difference
Thanks I will take it apart and check
 
Joined
Jun 21, 2019
Messages
57
There are two piston types, place on flat surface and measure the one you orginally had on it, one size is 15/16, the other 1 & 1/16. Buy accordingly. For a quick and dirty fix, as wrench suggested add some gaskets to increase spacing.
 

Don_Parsons

Well-Known Member
Joined
May 6, 2020
Messages
853
You'll most likely want to get the correct piston...

The engine would run better when the ports are in the proper spot...

25mm or a 30mm piston... what is the length of the connecting rod... there should be a number cast onto it...

Don
 
Top