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PostPosted: Sat May 27, 2017 11:41 am 
On the street
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Joined: Wed Nov 02, 2016 5:08 am
Posts: 15
Country: Canada
Bikes owned: 1968 T20
I have a conundrum.
2 cylinders ... 2 pistons.

I know that the arrow point forward... but does one piston go into a specific cylinder?
When I took them out they were thick with carbon!!!

Now that they are cleaned up I notice that one has an "E" and one has an "F".
Does it matter? Other than they were in there for a long time?

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"Some people know, and other's want to... Progress happens when you understand when to be who!"
PostPosted: Sat Jul 22, 2017 1:10 pm 
Yeah Man, the Interstate

Joined: Wed Jul 10, 2013 12:04 pm
Posts: 572
Country: England, UK
Bikes owned: FZ50, GP100, RG125 Gamma, GT380, Bandit 1200S
Are they both the same size?
Do they both have the ring locating pins in the same place?
Do they have any holes in different places?
If the answers are, yes, yes and no, then they are interchangeable.
However, as a general rule it is advisable to always make a note of which bore they came from and put them back in the same bore.
This is so that the rings and pistons are matched to the bore they have been bedded into. If you are fitting new rings, it is less important.
Are you fitting new rings?
If so don't forget to hone the bores of the barrels.

PostPosted: Sat Jul 22, 2017 5:17 pm 
Moto GP
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Joined: Mon Dec 13, 2010 4:32 pm
Posts: 3045
Location: southwestern Pennsylvania
Country: USA
Bikes owned: 69 T350 thru 75 GT750
Per the parts diagram there is only one part # for each of the sizes (standard, oversize 0.5 & oversize 1.0). So there is no left & right — they are the same.

Paul Miller has a NOS set of 1st over pistons. One is labeled “0.5” & the other is labeled “E”.

But another seller has a set of standard pistons labeled with “E”.

So your “E” & “F” might indicate different sizes.
Accurately measure your pistons + cylinders, and you should be able to sleuth this out.

BAS (Bike Acquisition Syndrome) - too many bikes but have room for more

GT750 2x75
GT550 72 project & 75
GT380 72
T500 73 project
T350 69, 71 & 72 project
T250 72
Honda 85 CB650SC & 86 CB700SC
Yamaha 75 XS650
09 Triumph Bonneville SE

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