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I found a mixture of sites for the information
one owner of a 1998 25 hp evinrude says that it is a 2 stroke with a fuel mix ratio of 50:1 as 25:1 is a bit smokey
another site says that the recommended octane fuel rating is 87 although it might run better on 91
best advice is to find an evinrude service dealer and get the right information as the later 25 hp units are etec engine which will be 4 strokes
all you need on a 2 stroke engine is the oil mixed with the fuel. the oil/fuel mixture lubricates your bottom end and your cylinder which is all that moves in a 2-stroke. if it is oil injected then use a 2 stroke oil rated for 50:1 mix. if you gotta mix it manually then just read the jug. hope that answers your question
Hi, Stevewright3 it should be noted that the "AIR FUEL" mixture screw adjustment "ONLY" manages your idle and has no effect on any other circuit also any intake leaks must be repaired before the A/F adjustment procedure can be performed otherwise you will never obtain a proper idle and you will waste a lot of time chasing the impossible. The A/F mixture screw's purpose is to fine tune the fuel charge entering the combustion chamber. The following applies to both 2 and 4 stroke engines:
1. The mixture screw may be sealed at the factory with a Welch Plug please review the following video for removal. https://www.youtube.com/watch?v=wAXcksgvDkM
2. The mixture screw manages a range of 3 complete 360-degree counterclockwise turns from the bottom/closed position.
3. The mixture screw should have a spring and o-ring for tension and sealing integrity.
4. Turn the mixture screw clockwise until it gently bottoms out, this makes the fuel charge very lean and the engine should not idle if it does then the pilot/idle jet is too big and needs to be replaced with the next size smaller.
5. Turn the mixture screw 1 and 1/2 turns counterclockwise to establish a baseline for starting the engine.
6. To fine-tune the idle circuit, adjust the mixture screw 1/4 turn in or out to achieve maximum idle RPM, wait 15 seconds between each adjustment for the idle to settle.
7. Never go past 3 full turns out this will make the fuel charge rich, foul plugs, and produce black smoke out of the exhaust, if the engine RPM keeps increasing past 3 turns the pilot/idle jet is too small and needs to be replaced with the next size larger.
7. After achieving maximum idle back out the mixture screw another 1/8 of a turn then adjust the throttle cable idle stop screw to 950-1050 RPM.
8. This procedure works great on 99% of all engines, for the 1% that demand a more robust throttle response on aftermarket monster fuel delivery systems additional tweaking outside the box may be necessary.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day. PW80 oil gas ratio and stock screw settings YAMAHA PW80 Owner Manual Adjusting The Carburetor Adjusting The Engine... YAMAHA PW80 Owner Service Manual OEM parts for Yamaha YAMAHA PW80 Owner Manual
From you manual: Two-stroke oil For great results and performance use HUSQVARNA two--stroke oil, which is specially formulated for our two-stroke engines. Mixture 1:50 (2%). To maximize the life of your trimmer, you may choose to use a high quality synthetic oil formulated for two-stroke engines. Mixture 1:50 (2%). Never use two--stroke oil intended for water-cooled outboard engines, sometimes referred to as outboard oil. Never use oil intended for four-stroke engines. WARNING! Always ensure there is adequate ventilation when handling fuel.
1 gallon of premium fuel to 2.6 ounces 2-cycle oil. 2.6 ounce pre-measured containers are available at most chainsaw outlets.
You can find your manual here: HusqvarnaUSA.com http://www.husqvarna.com/us/homeowner/support/download-manuals/ Enter the 3 digit model number (no XPs, Es, just the numbers) Serial number decode – useful when downloading IPLs and Manuals 06 1500198 06 = year produced – 2006 (single digit before 2000) 15 = week produced - March 00198 = 198th unit Husky produced that week
All four stroke motors use straight gasoline or benzin. Only 2-stroke engines use a gas (benzin) + oil mix. Even some later model 2-stroke engines run straight gasoline and have a pump that mixes the oil with the gasoline. Most 2-strokes built after the mid-70's have the pump. You can easily by examination of the throttle cable. If it's equipped with a pump, the throttle cable will split from one cable on down to two cables where it enters the engine. Read your owner's manual.