Do I mix the oil and gas together and pour it in the gas tank or do I pour the gas in the tank and the waverunner mix's the oil and gas together?

It's a two stroke .. Mix oil to gas before you add gas to your tank.

Many of the 2 cycle motors use a 40:1 gas to oil mix. There should be a label on the motor that tells what the mixture should be. You also can buy a premixed container that has the gas ad oil mix all in one can. Just pour it in the gas tank, then pull the starter cord.

Engine oil goes in the gearbox/transmission. Two stroke oil (also know as pre-mix) is mixed with the gas and oil in a separate gas can (to thoroughly mix the pre-mix and gasoline) and then the mix is poured into the fuel tank.

https://www.jetdrift.com/yamaha-waverunner-3-650-review/

Gas oil mix 50-1

Most weedwackers are 2 cycle (stroke) engines, meaning the gas and oil are mixed together before you pour it into the gas tank. If it's a 4 cycle engine it appears there is no dip stick or convenience way to check the oil, you can only replace it. Here's a youtube video that may help.

http://www.youtube.com/watch?v=eiu6zd460oc

Did you get any instructions from the previous owner? If it's a 4 stroke waverunner there will be a dipstick on the engine block, but I'm guessing it's probably a 2 stroke engine because most watercraft used 2 stroke motors clear through the 1990's. The oil will be mixed with the gasoline when you fill it, bottles of 2 stroke oil can be purchased at most stores that carry oil. Your waverunner can be mixed at 50:1, which equals out to be 2.6 oz of oil per gallon of gasoline. On a 2 stroke engine the engine gets lubrication from the oil mixed with fuel and will burn up fast if straight gasoline is used. Let me know if you have any troubles, but try to get ahold of the previous owner to get some more info.
Daniel

If you're talking about mixing two-cycle oil with gas for a two stroke motor, always mix it in a gas can then pour it in the weed eater. It's easier to put the oil in the gas can first then fill it with gas to get the two mixed well.

Find the manual here http://www.homelite.com/service_support/product_owners_manuals b> Mixing the fuel The Generator is powered by a two-stroke, air-cooled engineand requires a fuel mixture of gasoline and 2-cycle fuel lubricant. NOTE: Always mix two-cycle engine lubricant likeHomelite's Exact Mix Semi Synthetic Lubricant with gasoline before fueling theunit. Running the Generator ongasoline alone will ruin the engine. NOTE: Recommend you use ONLY Homelite or G-oil® inyour product.( Or any 2 cycle motor oil in this is not available) Use a mixture of 50 parts unleaded regular gasoline and 1part two-stroke engine lubricant (50:1). Use branded 87 octane (R+M+2) unleadedgasoline or gasohol (maximum 10% ethyl alcohol, or 15% MTBE, no methylalcohol.)
NOTE: Always mix lubricant and gas in the properproportions: 2.6 ounces of lubricant to one gallon of unleaded gaso­line. To mix the lubricant and fuel together for use: 1. Pour 1/2 gallon of gasoline into a clean gas canor other container approved for fuel storage. Do not mix the fuel and lubricantdirectly in the Generato's fuel tank. 2. Add 2.6 ounces of two-cycle engine lubricant tothe gasoline mixture. 3. Add the remaining 1/2 gallon of gasoline. 4. Close the container holding the gas/lubricantmix and swirl the can to blend contents together. NOTE: Do not mix more than you will use in a month,and shake the container to blend thoroughly before each use. Using an old fuelmixture can cause starting difficulty or damage. DO NOT USE E85 FUEL. IT WILL VOID YOUR WARRANTY. NOTE: Fuel system damage or performance problems resultingfrom the use of an oxygenated fuel containing more than the percentages ofoxygenates stated previously are not covered under warranty. Ethanol. Gasoline containing up to 10% ethanol by volume(commonly referred to as E10) or 15% ethanol by volume (commonly referred to asE15) are acceptable. E85 is not. Whenadding fuel to the Generator, make sure the unit is sitting on level ground andthat the engine is not hot. Fuelonly with recommended 50:1 mixture of gasoline and lubricant as described in Mixingthe Fuel. Toadd fuel to the Generator: 1. Cleanarea around fuel tank cap, if necessary. 2. Removethe fuel tank cap. 3. Inserta clean funnel into the fuel tank. 4. Slowlypour gasoline/lubricant mixture into fuel tank. NOTE: Filltank no higher than 1/2 in. from top to allow for gasoline expansion. 1. Reinstallfuel cap. 2. Clean up any spills. J
Thanks for using FixYa!! I provide my answer for free as a publicservice - a 4 THUMBS rating and POSITIVE Comment is really appreciated for theFREE answering of your question.

LtCmdr Spock said: "An ancestor of mine maintained, that if youeliminate the impossible, whatever remains, however improbable, must be thetruth."

Your fuel-oil mixture has too much oil in it. The standard ratio is 40:1 which means one of the little bottles of 2-stroke oil (about 2.6 fluid ounces) is added to 1 gallon of gas. Homelite recommends a 50:1 ratio but 40:1 is better, at least in my opinion.

The last time you made the mix, did you pour the oil into the gas or did you pour the oil into a little bit of gas in the gas can, shake well and then fill it with a gallon of gas? The former can give you lots of smoke as well because it is not mixed thoroughly. The latter is the best way to mix because the agitation and the flow of gas mixes the oil better.

Other possible causes to this problem are: how old is the mix you are using? Did this mix sit all winter last and you sre using it now? If so, did you add some Stabil to the mix before storing?

Depending on your answers to the above questions, you can determine why you are getting so much white smoke.

My recommendation to you is to:
(a) Empty the blower gas tank.
(b) Mix a fresh batch of oil and gas in an approved fuel container.
(c) Pull the spark plug and inspect it, if it is black/sooty replace it.
(d) Pour the new mix into the tank and start the blower.

This should get rid of the excess smoke, if it doesn't, let me know here. Good Luck!