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No. You're wrong

year 84 Diametre of piston standard: 69mm (good number jejeje)

Hello. I'm looking for piston for my XS400 DOHC with rings but I cann´t find them in Yamaha. Maybe can I put another piston of another bike?? Honda, Kawasaki... Thx!!!

Very very interesting :):bow2: Thx.

Thanks for the links, arfstrom. My intention is to know the measures to buy the stuff at any hardware (much cheaper)

A friend who has the same bike has removed the carburetor. We measured the washers and the o-ring. 5mm outer x 3mm inner

Good news. I have received a answer of mikuni-topham and tell me that the ref. of o-ring is N133.037 and the ref. of washer is VM12/33. This references are of Mikuni, NOT Yamaha I'm waiting for the ref. of pilot screw and spring

Hello. A few pictures. IMPORTANT. This is for XS400 12E or DOCH As you can see, the pilot screw + o-ring + washer + spring are missing!!!

Hello arfstrom. Can you tell me if these diagram is for Mikuni BS34. I got a Yamaha XS400 DOCH (83-85) and I want to know the reference of: - pilot screw - o-ring - wahser Thx, Sergio