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Fuel mix ratio is 32:1
If you want to mix it richer use 25:1
If you want to mix it leaner use 40:1.
Note* 32:1 is a good safe mixture, it's lean enough that spark plug fouling will be minimal but rich enough that the engine is sufficiently lubricated and will not suffer any harm. 40:1 and leaner will provide more power but less lubrication. Any ash less 2 stroke oil brand is acceptable for use in these 2 stroke engines. Examples are: Pennzoil, Honda, Lawnboy. All auto parts stores and Walmart Stores offer these in the oil section. Failure to mix oil with your gasoline will result in engine seizure within 30 seconds. 4 ounces of oil to 1 gallon of gasoline / petrol is = to 32:1
Its been a while since I've seen a two stroke scooter but usually there is a oil tank that you keep full and the scooter takes that oil and mixes it with the fuel worry free. You don't have to pre-mix it like weedeaters and chainsaws. Just make sure that oil tank is always full. I found this manual: https://absolutelyscooters.net/manuals/CPI%20User%20service%20manual%2050%20cc%20scooter.pdf
On page 5, it shows where the oil tank is and on page 34, it states in a footnote on the bottom of that chart, that they specify synthetic oil. Keep a bottle of two stroke oil in the storage compartment at all times and check when you refuel. The engine will over heat and lock up if you forget to keep the oil filled.
You might get lucky with new spark plug(s) and I assume you mean 2-stroke oil. Otherwise, drain tank and replace any fuel filter in system, then re-try with fresh gas and new plug (s)
You are going to need more information before you start this up.
You need to know whether it is 2-stroke or 4-stroke.
You need to know the manufacturer, I see some use 25 parts gasoline to 1 part 2-stroke oil. Other machines use a different proportion.
If it is this manufacturer, mix say 25 ounces of gas with 1 ounce of 2-stroke oil in a separate container and pour into gas tank.
If it is 4-stroke, you will need oil in the crankcase, not in the fuel tank.
Try to find the name of the bike/quad somewhere.
You don't " get a cylinder cleaned ". Who ever says that doesn't know what he is talking about. I assume the engine is a two stroke. The gas/oil mixture should be 32 to1. That means 4 ounces of two stroke engine oil to one gallon of gas. If the scooter has an automatic oil pump be sure there is oil in the oil tank. It should automaticly pump the engine oil at the proper rate. If this is an older scooter, you could remove the cylinder head and de-carbon it and then check the exhaust port to be sure the port has not been made smaller due to carbon build up. The port should be about 1/2" tall and 1" wide. Also check and clean the air filter. If it is a new scooter is it still under warranty?
49 cc gas coming out of a flexile line! Need to know where to tie it in
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