z900 Piston Details


The piston rings on a Z1 or KZ900 are 65.94mm standard size in a 66.01mm bore. Even a Clymers manual has all the ring specs, if you need them.

903cc engine specifications:

Standard cylinder bore diameter – 66.000 – 66.019mm (Wear limit – 66.10mm)

Standard piston skirt diameter – 65.93 – 65.95mm (Wear limit – 65.80mm)

Maximum cylinder bore taper – 0.05mm

Maximum piston skirt to cylinder clearance 0.060 – 0.079mm

Piston Ring end gap – 0.2 -0.4mm (Wear limit 0.7mm)

Piston ring clearance in groove:
Top Ring – 0.045 – 0.080mm (Wear Limit 0.18mm)
Second Ring – 0.010 – 0.050mm (Wear Limit 0.15mm)
Oil Ring – 0.010 – 0.050mm (Wear Limit 0.15mm)

Notes

Measure pistons for cylinder clearance check at a point 5mm from bottom of skirt at a right angle to piston hole.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s