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Old 04-20-2015, 06:29 PM   #1
redgum78 OP
Joined: Feb 2014
Oddometer: 7
Help from the Honda XL500 experts

Hi Guys,

I need some help identifying a piston.

Some time ago I picked up a rough but cheap 80/81 XL500S.

A few days ago I decided to give it a freshen up. I fitted new clutch plates and a new kick starter spring (old one had broken). I have got the bottom end all back together.
While it was out of the bike I thought I would put a set of rings in it as it is a smoky.

The Bore is 89.6mm and the piston has 0.50 stamped on the top. Cast into the underside of the piston are the letters "ART" and the number "2".

As it is an oversized piston I need to know if it is a Honda one or some other brand. No point getting oversize Honda rings if they don't suit the piston.

Does anyone know what the ART means?

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Old 04-20-2015, 08:00 PM   #2
redgum78 OP
Joined: Feb 2014
Oddometer: 7
So not a honda piston. Thanks Gator.
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Old 04-21-2015, 08:43 AM   #3
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Joined: Jul 2011
Location: central coast of California
Oddometer: 487
Have you checked the rings to be sure they are worn past spec?
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Old 04-22-2015, 01:52 PM   #4
Joined: Mar 2005
Oddometer: 38

Thought they made OEM pistons for most of the Japanese factories, even Honda.
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Old Yesterday, 05:33 AM   #5
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Joined: Nov 2007
Location: Eureka, Ca.
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Every stock Honda piston I have seen--at least the old thumper pistons-- has ART cast into it.
The piston you have is a half mm oversize factory Honda piston.
2014.5 Kawasaki KLR650 NE-2006 Buell XB12SS-2001 Husaberg FE650E-2001 Yamaha WR250F-1993 Kawasaki KX500-1984 Honda XL600R/XR650L Hybrid-1984 Yamaha TT600L-1980 Honda CB750F
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Old Yesterday, 06:50 AM   #6
The Ice Man
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