piston problems !

Valentino Mossy · World Chat Champion Joined: 13 Jul 2003 Karma :

On a ns125r does the arrow point to the carb or to the front ?
The haynes manual say " in" is pointing to the carb ?

My old knacked piston has two large holes on the one side, but the one i had ian sold me hasnt, would it be okay to use ?
If so, whats with the large hole like windows on my old piston ?

Need urgent help due to bike in bits !!! Wink

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Ian (GPX) · Brolly Dolly Joined: 05 Aug 2003 Karma :

See PM I sent to you.

Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

Hi

Normally the arrow points towards the exhaust port. Honda mentioned an "IN" mark on the piston, which I presume is the word IN stamped onto the piston.

If you look carefully at the piston you will probably find that the gudgeon pin is not central. Check this on the old and new piston.

The holes in the piston skirt affect the timing of the inlet port.

All the best

Keith
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Valentino Mossy · World Chat Champion Joined: 13 Jul 2003 Karma :

Problem sorted now,thanks keith !
Had a little chat to ian (sold me the parts Thumbs Up

)about it and the arrow points to the exhaust.

The reason why my old piston had the grooves cut in the back acording to ian is because its an orignal one, where as the new one is a aftermarket replacement.
Still okay though !
Cant wait to fire her up tomorrow ! Praying

that is if it starts !
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Ducati 916,white framed corse replica https://www.bikechatforums.com/viewtopic.php?t=239309
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