Question about Yamaha Motorcycles

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I own a Yamaha 150 HP 4-stroke. By mistake, I added a gallon of Yamalube when filling my tank (1:55 mix) (something I do for my older 2-stroke engine). Is this a problem?

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  • Yamaha Master
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Hi, Stephen just spoke a certified Yamaha outboard motor technician and he strongly recommends that you drain-siphon or pump out the contaminated fuel and replace it with fresh gasoline only.

Posted on Dec 03, 2019

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  • Contributor
  • 31 Answers

I always add about 10% oil to my small engines to help protect them from friction. If it starts ok with that much oil, it might smoke a bit and cause a little carbon build up on the plugs or valves, but most engines after 1980 are high enough heat and compression ratio to clean themselves up.
Sometimes the oil doesn't blend in all the way without some sloshing around.

Posted on Dec 03, 2019

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6 Suggested Answers

6ya6ya

6ya staff

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SOURCE:

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Posted on Jan 02, 2017

Fahr Quad

  • 736 Answers

SOURCE: do i have to mix 2 stroke oil on the gas for the 4

DO NOT mix oil in the gas on your four stroke engine. You will foul the spark plug(s), build up deposits on the valves and head, and make a smokey, smelly mess. A two stroke engine uses the fuel/oil mix to lubricate the engine before being used as fuel. A four stroke engine has a separate lubrication system and does not normally burn any oil. As the name implies, a two stroke engine works in two strokes. The first stroke is downward, where the fuel/oil mix and air are drawn into the cylinder. The momentum from the crankshaft counterbalance or force from the other cylinder(s) drive the piston back up compressing the mix, and the spark plug sparks at or slightly before the top of the stroke. The rapid combustion of the fuel/oil/air mix drives the piston down, which is the power stroke, and then the cycle starts all over again. A four stroke engine has an intake stroke down taking in the fuel/air mix, a compression stroke up, a power stroke down as the fuel/air mix is ignited at or before the top of the stroke, and a exhaust stroke up before starting all over again. A four stroke is much cleaner and more reliable than a two stroke, but it is heavier and has less torque. A two stroke engine is much lighter and has more torque, but takes more maintenance.

Posted on Feb 28, 2009

Anonymous

  • 7 Answers

SOURCE: smoking outboard

Sounds like your running a bit rich. Try leaning down your air/fuel ratio.

Posted on Aug 23, 2009

Anonymous

  • 53 Answers

SOURCE: yamaha outboard 150 4 stroke bad vibration at 700

is you propeller bent? a dent the size of a quarter will cause a shake. If not that means your engine is misfiring. here are the troubleshooting test and tool list you need to find out. Tools(1) A compression gauge (2) a spark gap tester.(3) A Clymer service manual for your engine. (you can purchase from your local outboard dealer. I know all these are expensive but if your going to be a outboard tech you will always need them. Troubleshooting (1) check compression. without the year model I'm giving you a average numbers. Look at your Clymer manual. all cylinders need to be over 100 lbs and equal each other within 5 lbs.(2) check spark. use a spark gap tester all cylinders should jump a half inch gap. if you have good compression and good spark, fuel is the problem nine times out of ten.Ethanol gas is proven to stay stable in fuel systems for 30 days in 90 + degree heat. Drain gas tank,clean fuel lines replace primer bulb and replace all fuel filters. Yamaha has a gravity filter under engine coul clean it. Finally replace spark plugs, I know spark plugs probably don't look bad but this is a outboard. Fresh spark plugs means less resistance for the ignition system. The ignition system is week compared to automotive. Test drive boat, if the problem is still there then there is further steps to take. Again I don't know the year model so I guessing its fuel injected. Pull out your clymer manual. what is great about the Clymer Manual for Novice techs is it gives detailed info on your outboard. Troubleshooting tips and teaches you how your outboard works.

Posted on Nov 03, 2009

dmsr63

Douglas Hansen

  • 2050 Answers

SOURCE: ktm 50cc 2 stroke selfmixer can i jus mix oil gas

Yes. If you look around, you might be able to get a kit to eliminate the oil injection pump.

Posted on Apr 15, 2010

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Benimur

Louie Role

  • 6966 Answers

SOURCE: i'm wondering if my 2003 yamaha TTR 125 is a 2

Hi and welcome to FixYa,

It uses a 4-stroke engine.

Good luck and thank you for asking FixYa.

Posted on Apr 18, 2010

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Where is the oil filter located on a 2004 Yamaha outboard two stroke motor


Some links including a video of how to change the filter. In such questions horsepower is useful along with year :>) Oil filters would only be on a 4 stroke though to protect the engine oil. Your two stoke doesn't have filters in the lower unit. There may be a strainer in the two stroke oil tank.

check page 31 here
http://www.yamaha-motor.com/assets/service/manuals/1/LIT-18626-07-03_1415.pdf

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I have a 2004 Yamaha Blaster and I pulled the drain plug too change the oil. It has a reserve box under the seat, how do you drain that oil or does it not get drained. And if not if its low in that box do...


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If the motor is a two stroke, (and i am sure that it is), you need to stop riding until you fill the tank with TWO STROKE ENGINE OIL . Riding without oil will quickly cause the engine to seize up. If not using an automatic oil pump, then mix the gas and oil 32 to 1. That equals 4 ounces of TWO STROKE ENGINE OIL to one gallon of gas. NEVER use motor oil in the gas. Only two stroke engine oil.

Use 10w40 motor oil in the gear box. Don't use any synthetic oils, oil marked "EC", or oil with "special" additives. Stick with the major brands; Pennzoil, Quaker State, Mobil or Shell.

A “very helpful” rating for this answer? Thanks! < < And it doesn't cost anything extra!

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Assuming you are using two stroke engine oil, the pump is pumping too much into the gas. DO NOT use motor oil in the gas. If 2 stroke oil is being used, then get a new pump, fix the one you have or disconnect the pump and mix the oil with gas when you fill up. Four ounces of 2 stroke oil per gallon of gas equals the standard 32/1 fuel mix.

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Wont stay running with out the choke on


it sounds like you need a carb clean performed. the idle cuciut jet is probably dirty and that is the jet that supplies gas to the combustion process at idle rpm's. when you have the choke pulled out it is adding fuel and air so when you shut off the choke the fuel supply goes away. for the oils use yamalube 2 stroke oil for pre-mix and 10w -30 gear oil for your tranny.

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