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08-12-2016, 03:21 PM
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#1 |
 Join Date: Aug 2016
Posts: 2
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GY6 exhaust valve corrosion driving me nuts.
I have a GY6 scooter, a 150cc (SUNL). It has 3k miles on it. My issue is the exhaust valve corroding with resulting loss of compression because the valve isn't seating properly until it quits. This is the second head I have installed on the machine (returning the old one when it failed). The valves are properly adjusted during install and the scooter burns nonethanol gas. What I cant figure out is rust and corrosion build up on the exhaust valve within 300 miles. The scooter has been taken on about 25 mile trips so its getting up to temp. I am now down to trying stainless valves. Has anyone else had this problem??
DSC03174.jpg Picture is kind of blurry but you can see the exhaust valve on the left and the rust/corrosion build up. I should also say the plug is clean and tan. Last edited by Robert3165; 08-12-2016 at 04:07 PM. |
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08-12-2016, 04:35 PM
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#2 |
 
Join Date: Jul 2011
Location: Connecticut
Posts: 493
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That looks like rust. Oil starvation or overheating would be the cause of that
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2011 Roketa MC-23-150 4T 150cc 157 qmj 24mm carb w 115 main jet and paper cone air filter Manual petcock w Tygon fuel lines Scrappy Dog Scooters Retro-slash stainless straight-thru exhaust RED spring clutch Adjustable CDI (brand unknown, it's blue and red and works great!) KOSO high performance variator w 12g sliders Gates Powerlink 835-20-30 belt GPS verified 65mph on flats. |
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08-13-2016, 10:38 PM
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#3 |
Join Date: May 2015
Location: Lanoka Harbor, NJ
Posts: 63
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I had read somewhere about the benefits of upper cylinder lubrication.
I added Lucas treatment to my fuel during my break-in period and occasionally since then. I don't know if this would be any type of help, or preventative, but I'm just throwing this out there. |
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10-01-2016, 11:11 AM
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#4 |
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Join Date: Aug 2016
Posts: 2
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Stainless valves seem to have solved the problem.
Its been a month and a half of regular riding with no loss of compression issues so I assume stainless did the trick. I am assuming it came down to bad Chinese steel that was causing the problems.
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