Make: Yamaha
Model: Big Bear 400
Submodel:
Years: 2000-2012
Series: Performance
System: Slip On
Shape: Round
Mount: Side
Color: Brushed Aluminum
End Cap: Turn Down - Brushed Aluminum
RE-JETTING REQUIRED Performance Series
- The Performance Series uses a 2 1/8" non-restrictive core for maximum flow.
- Depending on the model, you can expect a 4-6 dB increase over stock.
- The exhaust shell is made of T6061 Aluminum that weighs substantially less than stock.
- USFS Approved: All HMF offroad exhausts come with a USFS approved spark arrester.
- Two Year Warranty: HMF Engineering Inc. warranties all exhaust systems for two years from the date of purchase for all manufacturing defects.
New HMF Jet Kit for your Yamaha Big Bear 400 2000-2012 using an HMF exhaust.
RPO sells the HMF Jet Kit to work with HMF exhausts. When HMF designs an exhaust, they do several dyno runs with various jets and the jets that provide the best air/fuel ratio are added to the jet kit. Baseline is the manufacturers recommended jetting and smaller and larger jets included to accommodate changes in altitude or humidity.
This HMF Basic Jet Kit Includes: 2000-2012 - Individual Mikuni Small Round Jets: 115, 120, 125
Bikes must be jetted for valid exhaust warranties. | 
