Question about 2008 Keeway Matrix 150

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2 stroke engine smokes. how do you adjust the fuel/oil mixture?

I have not been riding my Keeway Scooter this winter, but, I've been starting it up every couple weeks.

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Possibly too much 2stroke oil in mixture causing spark plug to oil up .. needs to be run every day .. no adjustment that I know of to restrict oil mix .. !

Posted on Nov 07, 2012

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Hi my name is larry, i have a yamahaw bw scooter 50cc it smokes excessively hard to start sometimes i turn the key and nothing happens and sometimes it will just shut off while driving. what is this problem.

Posted on Aug 19, 2012

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The thing with two strokes is that they smoke a bit under normal operation, and they smoke like mad if they haven't really been run for a period of time, I would advise you to run it for a while and see if that helps.

You should not need to adjust the mixture settings at all.


Hope this helps

Posted on Feb 08, 2009

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1 Answer

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Hi Alan your oil looks milky because you ride your bike for short distances the engine oil temperature does not get hot enough to burn off condensation where you park your bike is probably a cool or cold place that creates condensation in your oil tank from the warm engine oil, you can try using a motorcycle cover to keep the cold air away from the warm engine and oil tank. I would drain the engine oil put in some cheap motorcycle engine oil run it on the road at freeway speeds for about an hour then drain it and replace with a quality semi or full synthetic motorcycle engine oil also change your oil regularly according to mfg suggested service intervals or sooner during winter months. I am sorry you can't find the first and best tool you ever bought for your Keeway but despair not for a mere $0 you can download another one. For more information about your issue, please visit the websites below. Good luck and have a nice day.
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Blue smoke comes out my exhaust only when choke is on


Blue smoke is usually the result of burning oil. It should not be burning at all, as it shouldn't be entering the combustion chamber or leaking on or in anything in a properly operating "4 stroke" (or 4 cycle) engine. Blue smoke in exhaust is not a normal condition for a properly operating "4 stroke" or "4 cycle" engine.

When the choke is on, the mixture of fuel and air is brought from "Stoichiometric" (about 14.7 parts air to 1 part gasoline or a "14.7:1 ratio") to a more "rich" mixture (about 13:1). This is not the ideal mixture to run, but it makes it easier for the engine to start and stay running until warmed up. When the mixture is rich, is is not uncommon to see black smoke - which happens because of incomplete combustion in the engine. The balance of the combustion happens in the exhaust system, where the energy in the fuel is converted only into heat and zero power. Since there is little air in the system, black smoke is produced. It may even smell of raw gasoline, too.

When running at proper mixture ratios of fuel to air, little if any smoke should be observed in the exhaust gases. It is possible that this small amount of oil being burned is so minute that it is not readily visible under these conditions - but is probably present never the less. You should carefully monitor the engine oil level and keep it filled. Oil leaking in the combustion chamber can indicate a problem that can be expensive to repair.

Two cycle (or two stroke) engines on the other hand, require that the oil and gasoline be premixed in the tank or are blended together "on the fly" and for this reason is not unusual to see blue smoke in the exhaust gases even when unchoked.

I hope this helps & good luck!

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