Re: what fuel 2 oil mixture do i run my yz250 2003
If you google ronnies.com and just go through the links to get your bike and it has all the diagrams you'll need. i have a 2000 yz250 and i run mine on 50;1 (100ml oil per 5 litres of petrol) and have found it runs really crisp and clean without the usual clouds of white smoke.
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THIS IS VERY EASY TO FIGURE OUT..THIS IS A RATIO OF 2 STROKE OIL TO GASOLINE MIXTURE..FOR ALL TWO STROKE ENGINES ONLY..MOST TWO STROKE OIL CONTAINERS HAVE THE CONVERSION CHART ON THEM FOR THE PROPER MIXTURE..ALWAYS SPEND THE MONEY AND BUY A GOOD BRAND OIL ..ALWAYS PREMIX YOUR GAS IN A SEPARATE GAS CONTAINER SO YOU CAN MIX IT UP VERY WELL BEFORE USING IT IN YOUR EQUIPMENT..NEVER STORE YOUR GAS TOOLS WITH FUEL IN THE GAS TANK..ITS BEST TO RUN EMPTY BEFORE STORAGE..THIS WILL PREVENT THE FUEL FROM GUMMING UP YOUR CARB AND SUCH..SAVES MANY HEADACHES..PLUS SAFER..
Never Mix That Much Fuel At One Time. Mix 2 GALS. At Most. 2-Strokes Don't Like Ethanol Fuel. Mix 4 OZ. Synthetic 2- Stroke Oil To 1 GAL. 93 Octane Fuel. Run The Correct AUTO-LITE Or Iridium NGK Plug. Lightly Seat The Air Screw On The Carb Then Turn(CCW) 1 1/2 Turns Out. Never Run With This Screw Less Than 1 Turn (CCW) Out. Make Shure Coolant Level Is Correct. Check The Reeds Ever So Often. When Replacing Use 2-Stage Carbon-Fiber.
You dont say what bike this is, however it does sound like you may have lost compression hence turns over easy, will not run, the theory is you need the engin to complete a cycle to run,1 ****, the fuel in. 2 squeeze or compress the fuel air mixture. Bang the process described when the fuel is ignited.
This unfortunately is a problem with carburetors on a Yamaha. The float sticks and allows fuel to seep past the needle valves and it ends up draining into the cylinders where it escapes past the rings and down in the oil sump. You are going to have to work on your carburetors and put a positive cutoff valve on your fuel flow or repair your automatic cutoff petcocks. You also will have to drain the oil sump and put fresh oil in as the fuel/gasoline mixture is too thin and may cause a fire.
Two essential problems: 1. Automatic petcocks not working properly, and 2. The float is not cutting off correctly.
If you have a good fat spark and timing is stock, with good compression, your problem is likely fuel/air mixture. Assuming you have good quality fresh fuel/oil. Set air mixture screw one and a half turns out. What is the condition of the reeds and reed holders. Is there a build-up of fuel/oil residue on the piston port skirts or the crankshaft? Check for absolute seal between carby and reed valve manifold. Check for obstructions through airbox inlet, filter and inlet to carby. Ensure the governor is not fouling. The site link below has exploded view diagrams for all components of the bike to see how it all works. Good luck, cheers.
This is not uncommon.
Things to check first would be your fuel mixture. You might be running a bit rich. You should be using a mix of 3.5 percent synthetic oil.
Being a 2 stroke, the tail pipe cartridge needs replacing from time to time, as it does collect oil with time. If the bike is a bit noisey change the packing.
Always remember that there is oil in fuel used on 2 strokes.
Lastly check the type of oil you are using. Mineral oil does tend to be a bit messy as the mixture requires around 5 percent oil.
Most off road stores now keep good LOW SMOKE oils such as Motrex.
Stick to good synthetic oils !