Help Please __ Honda Cr125r! Helpp

[rideordiemx57]

Very needed help, i purchased a 1988 cr125 pulled the top end and the cylinder bore is 133 thousands over Standard bore size is of the cylinder (54.00mm) ,, is this the exact spec it should be? can i throw a Standard piston in it and keep running or do i need to bore it to next size up, and does anyone know where i can send the cylinder and i can have it back in a week or so, need it done quick if i do have to send it out.

 

[RmTony]

You mean it's bored 2.00mm over (54.00mm to a 56.00mm), and no you cannot use the standard piston & ring, if you wanna go back to stock you will have to re-sleeve the cylinder or buy a new or used head.

 

[rideordiemx57]

You mean it's bored 2.00mm over (54.00mm to a 56.00mm), and no you cannot use the standard piston & ring, if you wanna go back to stock you will have to re-sleeve the cylinder or buy a new or used head.

The size in mm of the cylinder is 54.1528mm .. is that to much over 54mm to be able to put a stock piston back in and keep going ?

 

[RmTony]

are there any numbers on the head of the piston? if so please post.

 

[brett campbell]

54 MM = 2.126 inches
54,1528 MM = 2.132 inches
Thats .006 (six thousanths) of an inch.
Too much clearance!

 

[RmTony]

sounds like it will be fine using the stock (54mm) piston and ring.

 

[brett campbell]

sounds like it will be fine using the stock (54mm) piston and ring.

The stock clearance is ,05 MM (.002 Thousanths)
.006 is too much!

 

[RmTony]

did you measure the diameter of the piston with the ring?

click for pistons