Have a old go-kart with a B&S 5 hp 135212-0006that my grandson and I rebuilt. Purchased new carb, the old one was damaged. New valve springs and lapped valves. Starts fine and runs strong, but emits smoke and gets very hot after about 5-10 minutes. The plug is black. Using 10-30 oil. Can the carb mixture be adjusted? Should we be using a straight 30w oil? Any suggestions.
Go-kart running rich
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Doc Sprocket
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Is the new carb exactly the same as the old one? Perhaps you can compare the jet orifice sizes. Regarding the overheating- 10W30 should be fine. Make sure that oil level is correct, cooling fins and fan are clean, and all shrouds/sheetmetal are intact.
Doc Sprocket
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Air filter nice and clean? Choke off? For a true test-
Get a new, clean spark plug handy. Warm the engine up to operating temp, choke off, and quickly shut down the engine and swap in the new plug. Immediately restart, and do a full throttle run. With your foot still on the gas, kill the engine and coast to a stop. NOW look at the plug... Warning- Hot!
Get a new, clean spark plug handy. Warm the engine up to operating temp, choke off, and quickly shut down the engine and swap in the new plug. Immediately restart, and do a full throttle run. With your foot still on the gas, kill the engine and coast to a stop. NOW look at the plug... Warning- Hot!
OzFab
Well-known member
Coz it's getting too much fuel
Sorry, couldn't resist that one. Have a look at this, pay attention around the 2 minute mark:
http://www.youtube.com/watch?v=I-dkqIdv9GE
BW: Your pic didn't work; have a read of this:
http://www.diygokarts.com/vb/showthread.php?t=735
Doc Sprocket
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Did you test exactly as I described?
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