Thom and Edna Dickieson, Independent Amsoil Dealers, North Bay, ON (705) 476-9815

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Frequently Asked Questions About Motorcycle Applications

Street/Road Bike Questions

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

What is the recommended big twins and sportstersfor 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?

What is the actual weight of the Shock Therapy oils?

Motorcycle Oil Technical Facts

If you would like a FREE comprehensive wholesale pricing,  product, technical and business information sent to you just email us and we will provide all the information you ask for. If you have any special interests (diesel, motorcycle, racing, etc.) please let us know so we can include additional material pertaining to your special interests and or vehicles.

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?

Answer: Crankcase requiring 20W50 lubricant; Harley Davidson part numbers 99903-93 and 99896-88, use the AMSOIL High Performance Synthetic 20W-50 Motorcycle Engine Oil, product code AMV.

Transmission requiring 75W90 lubricant; Harley Davidson part numbers 99892-84 and 98853-96, use the AMSOIL Series 2000 Synthetic 75W90 (AGR/TGR) Gear Lube, product code TGR.

Chain Case Oil (primary) lubricants requiring 10W40; Harley Davidson part number 99887-84, uses the AMSOIL High Performance Synthetic 10W40 Motorcycle Engine Oil, product code AMF.

The exception is the Sportster. It has two oil reservoirs instead of three and uses the same oil in both reservoirs. Use AMSOIL 20W50 Synthetic Engine Lubricant in both reservoirs, product code AMV

Note: The AMSOIL 20w50 (AMV) and 10W40 (AMF) Motorcycle Engine Oils do not contain friction modifiers and meet Harley Davidson specification for the wet clutch system. 

Harley-Davidson forks that recommend type "E" or "B" fork oils, use the AMSOIL Shock Therapy Suspension Fluid, product code STM

Harley Davidson air filter part numbers, 2900252, 29002-52A, 29002-57, 29002-58, and 29036-56 uses the AMSOIL, product code TS-77

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Question: What is the recommended transmission lube for Harley Davidson, both big twins and sportsters?

Answer: For the 883cc and 1200cc sportster motorcycles, the AMSOIL Synthetic 20W-50 Motorcycle Oil is recommended for both the engine and transmission. On 1340cc and 1450cc models, the 20W-50 Motorcycle Oil is recommended for the engine crankcase, Series 2000 75W-90 Gear Lube for the transmission and the 10W-40 Motorcycle Oil for the chaincase.

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

Answer: Although the Series 2000 Chaincase Lubricant will, in most cases, provide adequate performance in this application, it is not the recommended oil. AMSOIL 10W-40 Motor Oil is recommended for the primary chaincase in Harley Davidson big twins.

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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: In two-cycle dirt bike applications, when changing from another brand of oil mixed at a 40:1 ratio to AMSOIL Series 2000 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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