Check out my piston !

[JBRoc01blaster]

Aright so I was puttin on my new head yesterday and had a chance to check out the top of my piston ... I don't think it necessarily looks bad, but I'm not sure if it looks good either. I looked on Ken's ( O'Connor of course ) website at the "piston death" on the "technical" page and out of all the pics I think my piston resembles the "No problems here" pic more then any other. Here's a few pictures of my piston so you guys can let me know what you think ... Thanks guys !

 

[Blaaster]

The proof would be revealed if you pull the exhaust pipe off and look up the port for any piston scoring/scuffing or ring damage.

 

[89blaster89]

not trying to thread jack but if you look up the port and see some scratches and maybe a scuff here and there is it ok? my last rebuild was in 2006 by the previuos owner my comp is at 135 psi

 

[Blaaster]

A few marks could be ok, it depends on the severity of them. Providing the rings are free to move between the lands you should be ok.

If one is concerned about running lean and detonation, the first place I would look at is where the majority of heat would be concentrated.

The piston crown where is opens up at the port is usually the first give away of overheating, it then grows in severity downward from there.

 

[JBRoc01blaster]

Blaaster - The proof would be revealed if you pull the exhaust pipe off and look up the port for any piston scoring/scuffing or ring damage.



Ill be doing a leak test tomorrow when I get out of work or Saturday afternoon, Ill be able to check both exhaust side as well as on the carb side of the piston. And NO I have not, nor will I ride until the leak test is performed haha.

 

[Blaaster]

Smart fella, you just got a bit of green!

 

[JBRoc01blaster]

Thanks I appreciate the compliment as well as the green ! I don't want to fall victim of your " I just wanna ride " scenario haha . . . I'm goin to bed as I have to wake up at 6:30 for work and its already 12:40, I will keep checkin back for opinions as well as to update the condition of my piston as soon as I get to it !

 

[Blaaster]

I look forward to the updates.

 

[89blaster89]

when you install a new head with a reused anealed gasket shouldint you start it for a second to give the new gasket time to expand then retorque it then leak test?

 

[Blaaster]

Same as a new one, 3 heat cycles and then re tension, the idea is to condition the copper.

 

[Blaner]

looks nice and fairy rich, check the exhaust port for the best indication

 

[JBRoc01blaster]

I had a little bit of time tonight to at least remove my exhaust and get a good look up the exhaust port at my piston and rings. Everything appeared to be okay to me, and I pushed on the rings to ensure they were not sticking. Here's a few pictures so you guys can let me know what you think ! I apologize for the quality of the pics not being the best.

 

[89blaster89]

clean and polish that exhaust port man

 

[JBRoc01blaster]

Haha yeah I definitely need to get all that carbon build up out of there . . . My exhaust port is down to like half the size it should be, I'm robbing myself of airflow/power. I had no idea it was soo bad or I would have cleaned it up a loonnggg time ago ! Between the new head mod and removing all that carbon to open that exhaust port up I should feel a substantial increase in power/acceleration

 

[best]

135 psi? Ah, you are good.
The top and sides of your piston look ok.

Steve

 

[Blaaster]

From what I can see through the blurr, the piston looks fine.

That carbon build up tells me you have been running rich for a while.

 

[JBRoc01blaster]

I thought the same thing when I saw all that carbon build up but the weird thing is I only have a 280 main in and I'm running a Gold series fatty, powercore ll, v-force 3's, no toil filter, (6) uni box vents and I removed the snorkel. Could it have something to do with possibly having my air mixture screw set too rich ?

 

[Blaaster]

Air screw has little effect on carbon buildup unless Granny rides it.

What brand of oil and what ratio.

 

[JBRoc01blaster]

Haha there's no Granny riding bein done by me, I don't beat on it ( not all the time anyway lol ) but I ride hard ! I use Maxima Castor Oil at 40-1, ALWAYS 93 octane and anytime she sits for more then a week I drain the old gas and use new. Could it have anything to do with me sometimes neglecting my air filter ? I have also done the diy +4 timing mod tho I don't know if that would have much, if any effect on carbon build up.

 

[89blaster89]

Same as a new one, 3 heat cycles and then re tension, the idea is to condition the copper.

so you do all that before leak test?