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Old 12-09-2012, 03:21 PM   #6513
Aaron from Texas
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Joined: May 2010
Location: Texas
Oddometer: 489
Originally Posted by mickd View Post
well i had my first PITA on the 690 today,having a nice easy ride in mt mee,the 690 stalled with a loud "POP" and a PSHHHHHHH, the sound came from under the air box area,so i had a good look around only to find the rubber boot had came away (see pic) and also the airbox was pushed back towards the battery
bike is a 2012,with less than 2000ks with a akro slip on inc akro mapping.

1, so what would make this happen,
2, is there a fix for this,cos i dont want it to happen again (PITA)
3, has there been a recall for this
This never happened to me on my bike until I replaced the intake roller rocker, and shimmed the intake valves on the tight end of the spectrum (Like, right at .07mm). After this, it happened several times. I only thought of the intake because of the recent work done, so I reshimmed the valves on the loose end of the spectrum, and vuala...

My thought on this is that at temperature, the valve clearance is so minimal, that at certain circumstances, the combustion of the engine happens while there is still a slight opening in the intake valves, and the energy follows the path of least resistance and blows off the throttle body. Just my theory...

But, it might be worth a shot to take a measurement of your intake valves. Mine hasn't happened once since my "fix."
1987 Honda XL600R
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