piston failure on 2007

[John Biccum]

Cracked pistons in the KLR are usually a result of detonation ("pinging") due to how lean the bike is jetted from the factory. It's not likely that the rider can hear the pinging at highway speeds, especially when wearing appropriate hearing protection. Typical place for the OEM piston to crack is in the land between two piston-ring grooves. That's where my 2002 piston cracked, at about 25K. Time for a 685 kit (with a *forged* not cast piston), sort out the jetting at the same time. From my phone, please excuse typos

On Aug 8, 2018, at 09:28, "'zoot .' zootpatutie@... [DSN_KLR650]" dsn_klr650@yahoogroups.com> wrote:   Five different KLR's through the years.  '89 with 32K, '95 with 46K, '06 with 60k.  Only major problem in years was a sheared cam sprocket pin on the '95.  Now own 2, '07's.  Mine cracked a piston last year at 21K +/-, now my wife's cracks a piston at 23K.  Is this a problem with the '07 piston forge or just sychronicity catching up with my carma? --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus