Yamaha Snowmobiles FX Nytro

Additional Notes

• The Yamaha FX Nytro cooling system capacities fall into three distinct values across the model range: 3.4 liters, 3.8 liters, and 4.9 liters. The 4.9-liter figure is the largest recorded across all listed configurations and appears exclusively in MTX-series and XTX 1.75 variants, reflecting the greater coolant volume associated with longer track and extended chassis designs.
• The MTX-series models (FX10MT and FX10MTR) from 2008-2009 carry a 4.7-liter cooling system capacity, which is a transitional value between the smaller 3.4–3.8-liter trail configurations and the later 4.9-liter MTX SE specification. The shift from 4.7 liters to 4.9 liters in the MTX line occurs with the 2010 model year introduction of the FX10M53 designation.
• A capacity increase from 3.4 liters to 3.8 liters is recorded across multiple configurations at the 2010 model year boundary. The FX Nytro RTX (FX10RTR), FX Nytro RTX SE (FX10RTRS), and FX Nytro XTX (FX10XT) all reflect this same upward revision, indicating a shared cooling system change across the standard trail and crossover variants at that point.
• The base FX Nytro (FX10) holds a 3.4-liter cooling system capacity for 2008-2009, and the same 3.4-liter figure is carried into the 2009-2010 overlap entry before the 3.8-liter specification takes effect for 2010-2013. The overlap in year ranges between consecutive entries for the same model reflects how specification transitions are recorded across production periods.
• The FX Nytro RTX SE (FX10RTRS) has two separate capacity entries within the 2009-2010 period: 3.4 liters for 2009-2010 and 3.8 liters for the 2010 model year specifically. Both entries share the same model code, meaning the capacity difference is tied to a mid-cycle revision rather than a trim or engine change.
• All cooling system capacities across every listed FX Nytro configuration are specified under normal use conditions. In fluid service contexts, a normal use designation typically applies to standard operating environments without the additional thermal stress associated with severe-duty classifications such as racing, sustained high-load operation, or extreme cold starts.
• The FX Nytro XTX 1.75 (FX10XT75D), listed only for 2013, carries a 4.9-liter cooling system capacity. This matches the MTX SE figure rather than the 3.8-liter capacity of the standard FX10XT running through 2010-2013, distinguishing the 1.75-track variant as a separate cooling system configuration despite sharing the XTX designation.
• The FX Nytro MTX SE (FX10M53Z, FX10M53SZ, FX10M62SZ) covering 2010-2013 maintains a consistent 4.9-liter capacity across all three sub-variants within that grouping. The presence of multiple model codes under a single capacity entry indicates that the 153-inch and 162-inch track length variants share the same cooling system volume specification.