Piston Wash Question

[mountainlessMN]

So I have an M7 that is giving me a bog and I believe it is to rich. I had a ring spin and catch the exhaust port, on the mag cylinder back in January. I had the bog prior to rebuilding the top end and it doesn't seem to run any better or worse since I rebuilt it. Odd thing is it bogs here in MN at low elevation but ran flawlessly, until the ring spun, out in West Yellowstone.

My question is, will the additional oil I put in the gas, or being such a fresh motor have any effect on piston wash? I did some half throttle runs across a field and looked at the wash and I see zero carbon deposits. The top of the pistons look as clean as when I put them in. Only have put about 5 break in miles on the sled...

I am going to go get a fuel gauge and see what my pressure is at but just want to be sure I know what to expect with new pistons in.

Tim

 

[up-high]

Mixing oil will affect the wash. Some oils almost eliminate piston was. Probably need more miles to get a wash you can read. About the bog. What were the temps in MN and Yellowstone? Might have been colder out west when you were there?

 

[mountainlessMN]

It's EFI so temp should be compensated for... Checked fuel pressure, it's a little on the high side but only by a few psi... Looks like I have another issue. Will have to get over to the cat thread.

I was under the impression piston wash was the most consistent indicator of a/f ratio but it doesn't sound like that's the case.... Thanks

 

[m8magicandmystery]

it takes a while for wash to form..alot more then what you ran..imo...

go with plug readings till you get a wash ...and he crispness..

no mods you should be fine with all stock settings...the mixed gas may be giving you the little bog

 

[mountainlessMN]

okay I will burn up the pre-mix oil and get straight fuel through it and a new set of plugs and go from there.

Thanks for the replies.