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I have recently purchased a K2 R600.
It was a very cheap find, and going into it I know there would be some problems to fix, but a few hours of work to get a half price bike is worth it for me.
The problems were found very quickly. I am unable to give the throttle more than 10 percent power. If I twist the throttle past 10% the bike will get louder and lose power (almost like it was bogging). I checked the fuel pump, air filter, spark plugs, and fuel injectors and all were in perfect condition. (Previous owners took very good care of this bike)
However, after removing the throttle body, I was able to get a look at the top of the valves and notices a thick coating of carbon buildup. Looking into the combustion chamber underneath the valves showed a similar story.
I have dropped out the engine and taken it inside to work on over the winter.
So far I have removed the cylinder head and I'm going to begin cleaning the tops of the pistons and valves.
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As you can see, there are filthy. This is my first engine rebuild, but I've heard from other forums that this is an unhealthy amount of carbon buildup.
As shown in the first image of the valves, there appears to be a gradient of build up. The left valves looks almost pristine, where the right valves is caked so thick that I couldn't scratch it off with a knife. My theory is that the person before me did not put the cylinder head gasket on correctly and negated to follow a star pattern when attaching the bolts causing the gasket to not be seated evenly.
My other theory is that I need to replace the piston rings. They are possible leaking oil from bellow the pistons.
My question to you (the fine human taking the time to read this online plea) is the following.
Is it more likely that the cylinder head gasket was leaking oil into the combustion chambers? Or is it more likely the pistons themselves were leaking oil from failed piston rings?
or do you believe that this is caused by something else entirely?
Any insight is appreciated, and thank you for your time.
It was a very cheap find, and going into it I know there would be some problems to fix, but a few hours of work to get a half price bike is worth it for me.
The problems were found very quickly. I am unable to give the throttle more than 10 percent power. If I twist the throttle past 10% the bike will get louder and lose power (almost like it was bogging). I checked the fuel pump, air filter, spark plugs, and fuel injectors and all were in perfect condition. (Previous owners took very good care of this bike)
However, after removing the throttle body, I was able to get a look at the top of the valves and notices a thick coating of carbon buildup. Looking into the combustion chamber underneath the valves showed a similar story.
I have dropped out the engine and taken it inside to work on over the winter.
So far I have removed the cylinder head and I'm going to begin cleaning the tops of the pistons and valves.
As you can see, there are filthy. This is my first engine rebuild, but I've heard from other forums that this is an unhealthy amount of carbon buildup.
As shown in the first image of the valves, there appears to be a gradient of build up. The left valves looks almost pristine, where the right valves is caked so thick that I couldn't scratch it off with a knife. My theory is that the person before me did not put the cylinder head gasket on correctly and negated to follow a star pattern when attaching the bolts causing the gasket to not be seated evenly.
My other theory is that I need to replace the piston rings. They are possible leaking oil from bellow the pistons.
My question to you (the fine human taking the time to read this online plea) is the following.
Is it more likely that the cylinder head gasket was leaking oil into the combustion chambers? Or is it more likely the pistons themselves were leaking oil from failed piston rings?
or do you believe that this is caused by something else entirely?
Any insight is appreciated, and thank you for your time.
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