AMSOIL Motorcycle Products FAQ's- Two cycle and Four cycle

Which AMSOIL products should I use for my Harley Davidson motorcycle?

What Amsoil products are recommended for Harley Davidson, both big twins and sportsters?

Will using AMSOIL Engine Flush in motorcycle engines damage the wet clutch?

Would the AMSOIL Chaincase Lubricant be appropriate for the primary on a Harley Davidson big twin?

What is the correct shock therapy oil for a 1999 Harley-Davidson Electra Glide FLHTC?

I just bought a Suzuki Savage 650 and want to change it over to AMSOIL. What oil would be the best to use in this application?

What is the actual weight of the Shock Therapy oils?

Motorcycle Oil Technical Facts

Ask us which synthetic products are best for your application

Dirt/Off-Road Motorcycle Questions

Which AMSOIL motor oils are recommended for two-cycle engines?

Will carburetor settings change when switching to 50:1 2-cycle oil?

Is it safe to use AMSOIL Performance Improver in a 2-stroke engine?

What is the actual weight of the Shock Therapy oils?

Question: Which AMSOIL products should I use for my Harley Davidson motorcycle?

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Question: Will using AMSOIL Engine Flush in motorcycle engines damage the wet clutch?

Answer: It may soften clutch materials to the point where clutch packages could be damaged, and is not recommended for this application.

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Question: What is the correct shock therapy oil for a 1999 Harley-Davidson Electra Glide FLHTC?

Answer: The AMSOIL Medium Shock Therapy Oil (STM) is recommended for Harley-Davidson Motorcycles.  It is a replacement fluid for Harley-Davidson Type B and Type E fork oils.

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Question: I just read about the new 4-stroke oil.  I just bought a 2000 Suzuki Savage 650 and want to change it over to AMSOIL.  I have been debating on which oil to use in it and was wondering if the new 4-stroke oil would work the best.  My bike is a big single cylinder.  It has 3k miles on it.  I ride in Utah at 4-6k feet above sea level.  Also, the bike has a wet clutch on it.  Please let me know what you would recommend that would work best for my application.

Answer: Although the AMSOIL 4-stroke Oil would provide excellent performance in this application, the recommended motor oil is the AMSOIL Synthetic 10W-40 Motorcycle Oil.  This lubricant is formulated specifically for motorcycles and is wet clutch-compatible.

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Question: In two-cycle dirt bike applications, when changing from another brand of oil mixed at a 40:1 ratio to AMSOIL Signature Series 2-Cycle Oil mixed at a 50:1, would jetting of the carburetor be affected?

Answer: There is such a small difference between a 40:1 and 50:1 ratio that it is not necessary to make adjustments on most applications.

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Question: What is the actual oil weight for the following suspension fluids: STL - Shock Therapy Light and STM - Shock Therapy Medium?

Answer: Shock Therapy Light corresponds to a 5 wt. and Shock Therapy Medium corresponds to a 10 wt.

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Question: Is it safe to use AMSOIL Performance Improver in a 2-stroke engine?

Answer: The AMSOIL Performance Improver is recommended for both two-stroke and four-stroke engines.  It is very helpful in reducing carbon deposits and cleaning the entire fuel system.

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