Dropped valve seat

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Kickaha
Diana
Posts: 51
Joined: Tue Sep 02, 2008 12:14 am
Location: New Zealand

Dropped valve seat

Post by Kickaha » Tue May 10, 2011 9:21 pm

Well I haven't got the head off yet as the bike is still 350km and a ferry crossing away but I'm picking that's what has happened on the front head

I have since been told by two people that it isn't uncommon and generally it is more likely while riding in the rain as the front head gets way more cooling?

The bike started sounding slightly different but didn't loose any power and as it was wet I carried on to the next town 30km down the road, by this time the rain had stopped and as the revs dropped when I turned a slow corner in a 50km zone there was a "clunk" I got the clutch in straight away

Tried the starter and it locked solid, could pull the bike back and it would do a revolution then lock up, pulled the front plug and it's munted

I've dropped valves before and they made a lot more noise so I'm picking it's the seat?
Eat Right
Stay fit
Die anyway

rwhc80
750 GT
Posts: 174
Joined: Sat May 16, 2009 6:19 am
Location: Melbourne Australia

Post by rwhc80 » Sun May 15, 2011 4:42 pm

Kick,

Have you got the head off that thing yet ? interested to know what it was?

Cheers
Rick
I have desmo disease, I just hope they never find a cure !!!

Kickaha
Diana
Posts: 51
Joined: Tue Sep 02, 2008 12:14 am
Location: New Zealand

Post by Kickaha » Fri May 27, 2011 12:29 am

rwhc80 wrote:Kick,

Have you got the head off that thing yet ? interested to know what it was?

Cheers
Rick
Got it apart tonight

The head had come off the valve and embedded itself in the head after punching a hole through the piston

looks like the valves are two piece as the head had come off very clean

So I'm up for a full top end rebuild which will include replacing all the valves
Eat Right
Stay fit
Die anyway

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