Freestyle Another piston wash thread...

[Brian_216]

Ok so I'm pretty sure my engine is about perfectly set up. I still have a tiny lean hesitation on the bottom with the 122.5 pilots, 127.5 was too rich and I couldn't get it right. I didn't have 125s to try at the time. So now I think I have my answer there. Top end feels amazing. I'm trying to make sense of this piston wash. When I pull the head off I see the carbon pattern on the piston but the edges where it should be clean are covered in a thin layer of brown oily residue. I wiped the pistons with wd40 and the second pic looks like its perfect. I do still have very dark spark plugs... Like a Hershey bar color.. Not the lighter brown color I'm after. So I'm baffled... Take a look and let me know what you think. I will say I'm really happy with how it feels! But I'm the kind of guy that won't sleep at night knowing there is 2 more hp to be found in my engine with a little more tuning.

Sorry the plug pic is hard to take close enough and get right, but you can see its dark.

 

[Brian_216]

The mark on the piston is from my video scope when I was trying to look inside before I pulled the head. I should add this is a 10mm DASA 970 with full spec 48s

 

[kieran79]

How many gallons have you put through ? Mine still look shiny dose that mean I'm way to rich ? Or I haven't put enough fuel through it yet.

 

[Brian_216]

I got it with 20 hours on it. I ran about 5 gallons. I took the opportunity to clean the carbon off completely. I'm gonna start fresh and see what mine really looks like after 15-20 gallons.

 

[air blair]

Id say your oring is leaking. Thats what my head looked like @ wavedaze. Replaced oring and all good

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[Brian_216]

Wouldn't be a bad idea to get a spare set. Thanks!