View Full Version : does this look bad? the head.
December 11th, 2010, 11:50 AM
hey i was wondering if this looked bad. can this affect the performance of my bike? a piece of metal fell on the piston and nicked the head right there.
December 11th, 2010, 03:09 PM
Na man you are good to go fa sho. I once rode a bike with half the piston sitting at the bottom of the cases and the other half still pounding away in the cylinder. Just keep it pinned until it STANKS!!!
December 11th, 2010, 04:57 PM
looks like the valve guide is broke off also.. thats most likely what damaged the head
December 11th, 2010, 07:03 PM
ya thats what happened. but is it gonna affect the performance or mess anything else up?
December 12th, 2010, 08:47 AM
If you dont replace the guide the valve will move in directions it shouldnt and do more damage, but the big dent doesnt appear to be into the gasket area or in the valveseat area, but looks like the seat is damaged where the broken guide came through.. So i would say at least that valve is bent. If that is a 09 kawi head i would replace all the guides because the rest arent far behind the one thats broken now..
December 12th, 2010, 08:57 AM
and if you have a matching dent on the top of your piston your crank rod could be bent as well.
December 12th, 2010, 05:21 PM
If that big dent has any sharp edges it can cause hot spots which will cause pre-ignition. Hit it with some emery cloth to knock the edges off.
December 12th, 2010, 09:08 PM
ya i smoothed out that nick. heres a picture of the piston. it had about 10 minutes on a new top end lol. there was a piece of the guide smashed into the piston but i pryed it off.
December 15th, 2010, 05:18 PM
You need to check your rod, check crank runout and replace the valve guide.
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