is it ok?

[imsimon]

Hello doing another job on the bike I thought id have a peep in the exhaust port and look at what I could of the piston cylinder. Now im still new to offroaders so dont really kkow what im looking for. A compression test says 185psi which I think is ok
So any observations on the following pics

Side of piston







What im really after is there anything that makes u think omg change that piston straight away! I dont know excatly how long this piston has been in so I imagine the reaponse will be just change it anyway but id rather not uat yet id if I dont have to!

 

[imsimon]

 

[Jakobi]

Things that make you go AHH, are gouges scraping and scoring. Damage to the ring area. If you see large volumes of blow by (staining from combustion below the rings) its a sign you might need a top end.

From what I see you have little blow by and still evidence of some coating on the piston. Good compression too. I'd ride some more.

 

[eff]

Things that make you go AHH, are gouges scraping and scoring. Damage to the ring area. If you see large volumes of blow by (staining from combustion below the rings) its a sign you might need a top end.

From what I see you have little blow by and still evidence of some coating on the piston. Good compression too. I'd ride some more.

I agree.

 

[imsimon]

brilliant, I thought that was the case but wanted to check, I had been hearing some noise on deceleration and also on start up from a bit of reading I think its my power valve so will take that side apart and see if theres any slack which I think Ive now got figured out in my head thanks to the site!
im guessing its a new gasket everytime a tranny cover and power valve cover comes off?
maybe i'll just put up with some noise for a while!

and im really pleased Ive got a compression reading while it still looks ok so I can keep an eye on that periodically

 

[desertgasser300]

brilliant, I thought that was the case but wanted to check, I had been hearing some noise on deceleration and also on start up from a bit of reading I think its my power valve so will take that side apart and see if theres any slack which I think Ive now got figured out in my head thanks to the site!
im guessing its a new gasket everytime a tranny cover and power valve cover comes off?
maybe i'll just put up with some noise for a while!

and im really pleased Ive got a compression reading while it still looks ok so I can keep an eye on that periodically

Grease both sides of your gaskets when you have them off, then in the future they just fall off when taking the cover off and can re-used.

 

[(F5)]

brilliant, I thought that was the case but wanted to check, I had been hearing some noise on deceleration and also on start up from a bit of reading I think its my power valve so will take that side apart and see if theres any slack which I think Ive now got figured out in my head thanks to the site!
. . .y[/QUOTE ]
And the actuator lever at bottom touching the case vibrates. A light tickle will fix it if thus afflicted. Look for shiny witness marks on the ally case where the lever may rest when closed.

 

[motopsycho87]

mine used to rattle like hell on deceleration. use silicone sealer on the exhaust o-rings and let it dry for a couple hours, quitened it right up

 

[imsimon]

mine used to rattle like hell on deceleration. use silicone sealer on the exhaust o-rings and let it dry for a couple hours, quitened it right up

ohh lovely funnily enough when I took the exhaust one of the O-rings had perished. so I will try that! now being that im stupid are the O-rings supposed to be solid or rubber? I had one that is in tact that is solid for want of a better word and the other looks like a rubber washer???

 

[desertgasser300]

ohh lovely funnily enough when I took the exhaust one of the O-rings had perished. so I will try that! now being that im stupid are the O-rings supposed to be solid or rubber? I had one that is in tact that is solid for want of a better word and the other looks like a rubber washer???

Didn't you ask about these o-rings back in January?

 

[imsimon]

Didn't you ask about these o-rings back in January?

I sure did however, I ordered the ones mentioned in that thread which said get ones for a ktm 300 which I did they were rubber ones this is the one that has failed already after very little riding really so I wondered If had ordered the wrong type and it should of been a different material?

 

[desertgasser300]

I sure did however, I ordered the ones mentioned in that thread which said get ones for a ktm 300 which I did they were rubber ones this is the one that has failed already after very little riding really so I wondered If had ordered the wrong type and it should of been a different material?

If you are in the US you can order viton rings thru McMaster and Carr. 44x3
They are a wear item, order a pak of 10.

 

[imsimon]

thank you!

 

[SailDestin]

If you are in the US you can order viton rings thru McMaster and Carr. 44x3
They are a wear item, order a pak of 10.

Are they the same size for an 02 xc200?

 

[desertgasser300]

Are they the same size for an 02 xc200?

Yes, I believe they are.