Crusty Piston/ Powervalves

[Valdez]

Wondering if anybody has ever seen this before. I opened up my engine and the top off the piston is crusty ish and then when i open the powervlaves there was this liquid in it. I thought it was oil maybe but its not slimy/oily . It is dark black. Can anyone help me to tell me what is goin wrong. This is my first time taking my engine apart and my friends tell me somethin is wrong. Hope someone can help me . thanks

[NGX]

OK .. 1st we need to know how old is the bike sice its been Worked on .... ?

Next you will all ways see Black Carbon on top your piston as for the valves It sounds like over burnning of oil or fuel.. Im not 100 % on this Im told this is Normal... ? as adam says the older the bike has not been worked on the more U will see .. so U may be ok.. we would need more info .. Type bike.. Model, so on ..

Cheers :D

[Insane]

The black on the piston is carbon buildup, the older/longer its been between rebuilds on the bike, the more there will be... Nothing really wrong there unless there is a huge amount...

The liquid sounds like a mixture of burnt and unburnt oil from the fuel. What fuel/oil ratio are you running on what type of bike? It sounds normal though, kinda like the oil you get out the end of the pipe... nothing to worry about...

[Valdez]

i run a 50:1 mixture with full synthetic oil. Its a 99 yz 250. and it got rebuit about 5-6 months ago at the begging of the season.thanx alot for your help

[woolley_fmx]

Why did ya pull the bike down for ?? to replace the ring or some thing. I work at my local Honda dealership so I have worked on few bikes before. The excessive carbon build up is ok but is caused by poor fuel or a bad spark plug I suggest replacing it ..The oil on the power valves is normal that it’s lubrication however if it’s over slimy that means that you oil mixture is to rich.. hope this helps ya ..