X xxl ArboristSite Guru Joined Jan 14, 2007 Messages 716 Reaction score 156 Location na Jan 25, 2022 #1 Any body have brown spot in front of there muffler on. A 660. ? Engine is running 12.8k. The only work done was the ports smoothed Attachments 20220125_145003.jpg 789.7 KB · Views: 35
Any body have brown spot in front of there muffler on. A 660. ? Engine is running 12.8k. The only work done was the ports smoothed
Burning man Formerly known as TheBrushSlasher AS Supporting Member Joined Nov 11, 2021 Messages 442 Reaction score 858 Location 93602 Jan 25, 2022 #2 The times I've seen that it was related to the exhaust leaking where the muffler halves meet.
M Mad Professor Tree Freak AS Supporting Member. Joined Jul 2, 2007 Messages 18,185 Reaction score 26,085 Location North East USA Jan 25, 2022 #3 Oil that got cooked on?
X xxl ArboristSite Guru Joined Jan 14, 2007 Messages 716 Reaction score 156 Location na Jan 25, 2022 #4 i ll try a new gasket
Burning man Formerly known as TheBrushSlasher AS Supporting Member Joined Nov 11, 2021 Messages 442 Reaction score 858 Location 93602 Jan 25, 2022 #5 xxl said: i ll try a new gasket Click to expand... Make sure both halves aren't bent.
Burning man Formerly known as TheBrushSlasher AS Supporting Member Joined Nov 11, 2021 Messages 442 Reaction score 858 Location 93602 Jan 25, 2022 #6 Mad Professor said: Oil that got cooked on? Click to expand... That's possible, the new 391 we have at work has a spot like that now next to the exhaust outlet.
Mad Professor said: Oil that got cooked on? Click to expand... That's possible, the new 391 we have at work has a spot like that now next to the exhaust outlet.
S sven556 ArboristSite Operative Joined Apr 21, 2016 Messages 130 Reaction score 36 Location kansas Jan 26, 2022 #7 Seen it on multiple saws. Doesn't seen to be a big issue.
Dennisthemenace ArboristSite Operative Joined Jul 1, 2018 Messages 459 Reaction score 665 Location Australia Jan 26, 2022 #8 Minor exhaust leaks or maybe running a bit rich I'd reckon