Nasty Pictures: Blown Cylinder - Star Motorcycle Forums: Star Raider, V-Max, V-Star, Road-Star Forum
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post #1 of 2 (permalink) Old 10-19-2015, 04:36 PM Thread Starter
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caseyjones's Avatar
Join Date: Apr 2015
Location: Mechanicsburg, PA
Posts: 609
Nasty Pictures: Blown Cylinder

I knew when I got an absolute zero compression on the left cylinder that something was badly wrong. I figured the intake or exhaust valve had sheared a shaft and was just hanging there... maybe even slapping on the cylinder and beating it up. Boy was I wrong.

As some of you may know, my business is restoring vintage Japanese bikes or parting them out if too far gone. (Sorry, VStars are just what I ride - don't yet count as 'vintage' so I'm not-much-help vis-a-vis the forum).

But THIS is about the worst I've seen... I've seen cracked cylinders and bad rings. I've seen heads with a broken valve floating around inside. I've even seen cylinders with a full-on hole in them - like the size of a pencil-eraser. But in all my years working on often-abused bikes, I have never seen a cylinder with a massive hole blown right through the top like this! I have no idea what happened to this bike... but DAYUM!

FWIW, this is a 1982 Kawasaki KZ440 in otherwise-gorgeous condition.

2007 V-Star 1300

-Cobra Slip-ons
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post #2 of 2 (permalink) Old 10-20-2015, 03:37 PM
gunnerbob's Avatar
Join Date: Apr 2015
Location: The Low Country
Posts: 55
I didn't spot the problem, I just see another way for exhaust to escape. :/

1986 Honda VT500C - On loan to a family member
2005 Suzuki SV650 - ADV project bike
2013 V Star 950T - Newest addition to the stable
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