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Tag Archive for: outboard

Posts

Two-Stroke Oil For Drag-Racing Yamaha Outboard Engine?

Tech Discussion

A reader asks: I have a question regarding 2-stroke outboard engine oil for racing. My engine is a modified, high-compression, 40-horsepower Yamaha. This motor is used only for drag racing. During races, it runs up to 8000 rpm.

Would AMSOIL Dominator 2-Stroke Racing Oil work well? Or would AMSOIL Interceptor be a better option for this engine?

AMSOIL Interceptor Synthetic 2-Stroke OilOur answer: First, let us preface our answer by mentioning that the following oil recommendations apply to racing situations only. Stock outboard engines would require a different oil. This is important and we’ll touch on that below. Both Dominator and Interceptor will provide superb wear protection for your racing outboard. But because of the racing/marine operating conditions, we would lean toward Interceptor.

Marine engines are still apt to run cooler and operate at lower rpm than 2-stroke engines used on dry land (even in this racing application). Think motocross or kart racing engines that run at 12,000-plus rpm. Therefore, your racing outboard engine will still be prone to engine deposits.

Interceptor contains a large amount of detergents. The motivation for the high detergent content is to keep snowmobile power valves clean. So, you would see cleaner engine internals with Interceptor over Dominator.

Dominator is a “racing-only” 2-stroke formula. It was designed for dry land racing engines that are torn-down frequently. Dominator should be used only in modified engines that run at extremely hot operating temperatures. Therefore, less detergents are required.

Interceptor will deliver all of the wear control needed. Plus it will ward off deposits and prevent plug fouling.

For marine engines in stock trim, do not use Interceptor or Dominator. For normal marine conditions, depositing and plug-fouling could be the result.

What About Oil For Outboard Engines Under Normal Use?

Important: Stock 2-stroke outboard engines should use HP Marine or AMSOIL Synthetic Injector Oil. Both will provide exceptional wear protection and resist engine deposits.

July 14, 2020/by Marc Roden

A 100:1 Oil For Yamaha 2-Stroke Outboard Motor?

Tech Discussion

AMSOIL HP Marine Synthetic 2-Stroke OilA readers asks: I’ve got a 2009 Yamaha 20MLHH 2-stroke, 20 horsepower outboard engine. Yamaha recommends a 100:1 mix ratio. I see that AMSOIL HP Marine has a recommended premix ratio of 50:1. I feel that this ratio is too rich for this engine. Is there any way I can get the 100:1 AMSOIL Saber Outboard Oil in Canada? 

Our answer: Your Yamaha outboard engine can easily use AMSOIL HP Marine at 100:1. It can replace the OEM Yamalube 2M TC-W3 2-stroke oil (with less exhaust smoke). It is true that Saber Outboard Premix Oil is no longer offered in Canada. However, HP Marine is certainly not a downgrade for your engine.

While HP Marine has a suggested mix ratio of 50:1 on the label, it is no stranger to ultra-lean mix ratios. HP Marine has been heavily tested in Evinrude E-TEC engines at the “lean-mix” setting. This is the equivalent of an approximate 100:1 ratio. AMSOIL’s extensive testing under extreme loads at this lean-mix setting proves that it delivers outstanding wear protection.

Yamalube 2M TC-W3 2-stroke oil is only a partial-synthetic product. HP Marine is a 100% synthetic formula that offers the very latest two-stroke marine oil technology. Therefore, we would rate it as a considerable step up over the Yamalube product.

Features Of AMSOIL HP Marine

  • Low-smoke and odor
  • Robust synthetic wear protection
  • Resists carbon build-up
  • Provides excellent throttle response
  • Low aquatic toxicity
  • Protects against internal anti-rust and corrosion
  • For premix or oil-injected marine two-cycle engines

For US customers that have access to Saber Outboard, it is also an excellent choice for Yamaha outboards requiring a 100:1 premix ratio.

If you have questions or would like to request prices, contact us using the form on this page or call us at 1-800-748-5781.

February 14, 2019/by Marc Roden

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