So I have a 80cc motor brand new for bicycle I kept using pre-made 50 to 1 ratio mix and kept blowing head gaskets so what I'm asking is what is the proper mix to break in my motor
Help with fuel mixture
- Thread starter Jewboy 805
- Start date
You certainly aren’t blowing the head gaskets because of the fuel mixture. You really should start with something like 20 or even 16 to one for a few tanks. The head gasket is another problem.
Well make a proper mixture of about 20 to one or 16 to one. More won’t hurt it. Do you have a torque wrench? About 10 or 12 foot pounds on the head bolts with a fresh head gasket. Re-torque after after about an hour running and again after another two. Make sure the first time you blew the head gasket that it didn’t flame cut a grove in the head.
You should break in your engine for the first few tanks at about 24 x 1 and then switch to 32x1 after using a high quality synthetic or semi-synthetic 2 cycle oil. If you are blowing the head gasket it's usually because of excessive 4 stroking combined with a heavy load like going up a steep hill. I would recommend adjusting the carb. If you are using a stock NT carb you should set the needle clip on the leanest setting or switch to a smaller jet.
Somewhere I found this info.
New Motor - 16:1 (8 oz of oil per gallon)
After Broken in - 32:1 (4 oz of oil per gallon)
I found it simple to use a gallon gas can and a 6 oz bottles of Lucas synthetic 2 stroke oil. To start with the new engine, by the time you put in 6 oz of oil, the gallon gas can won't hold a gallon, that left me close to the 8 oz per gallon. After the break in time I have empty 6 oz bottles so I pour 2 oz in the empty, This left the 4 oz per gallon,. All the other was just bullchit. I know I pay more fpr the pizzant 6 oz bottles but convenience is worth it.
New Motor - 16:1 (8 oz of oil per gallon)
After Broken in - 32:1 (4 oz of oil per gallon)
I found it simple to use a gallon gas can and a 6 oz bottles of Lucas synthetic 2 stroke oil. To start with the new engine, by the time you put in 6 oz of oil, the gallon gas can won't hold a gallon, that left me close to the 8 oz per gallon. After the break in time I have empty 6 oz bottles so I pour 2 oz in the empty, This left the 4 oz per gallon,. All the other was just bullchit. I know I pay more fpr the pizzant 6 oz bottles but convenience is worth it.
Over torquing the head bolts will cause head gasket failure!!
Remove the head, use a piece of glass & some sand paper to sand the 'sealing ring' surface flat again & then install a new gasket.
Be sure to torque it down to 12 ft/lbs... (any tighter will cause the head to warp again).
Also... for break-in... my method is to use 32:1 (non synthetic oil) & ride it like you stole it!
Remove the head, use a piece of glass & some sand paper to sand the 'sealing ring' surface flat again & then install a new gasket.
Be sure to torque it down to 12 ft/lbs... (any tighter will cause the head to warp again).
Also... for break-in... my method is to use 32:1 (non synthetic oil) & ride it like you stole it!