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I WILL TRY TO EXPLAIN WHAT I MEAN WHEN
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WE TALK ABOUT LONG AND SHORT CONNECTING RODs.
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ON 50CC AND 70CC OVERHEAD CAM ENGINES ie Z50'S
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XR50'S CT70'S C70 PASSPORTS SL/XL/CL70'S ATC AND TRX70'S.
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FROM 1968 TO 2003 HONDA HAS ONLY HAD TWO DIFFERENT
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ROD LENGTHS. AND ALL!! ENGINES HAVE ALLWAYS HAD A
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41.4MM STROKE. THE BIG DIFFERENCE IS IN THE PISTONS 
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THERE MUST BE ABOUT 100 DIFFERENT, WELL IT SEEMS LIKE
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IT ANYWAY. THEY HAVE DIFFERENT DOMES AND DECK HEIGHTS
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 (THE DISTANCE FROM THE PISTON PIN
 CENTER TO THE TOP OF THE PISTON)

ENGINES WITH SHORT RODS ARE_

WE CONSIDER OUR 52MM STROKER'S TO HAVE SHORT RODS.

Z50'S 68 TO 81

C70 PASSPORTS 80 TO 81

ALL CL/SL/XL/ATC/TRX70'S

CT70'S 69 TO 81

!!!ALL OTHER USA IMPORTS HAVE THE LONG ROD!!!