Air Box Holes & MPG

• Initially I ran 90 miles of Freeway and 55 miles of swisties, got 44+ MPG.
• Ran 73 MPH on Freeway and 40 MPH to 65 MPH on swisties.
• Second tank, all swisties 40 to 65 MPH, got 47+.
• Third tank, all swisties 40 to 65, got 48+.
• Fourth tank, all swisties, 40 to 65 got 51+.
• Final tank, most secondary roads and freeway, at 65 to 75 MPH got 44+.

All the gas burned was 87 Octane only. The MPG was Fantastic but note below. Analysis, the holes have helped the MPG, but, I do not have good low RPM power, thus, it appears that I am running too lean. When I got home I put Duck Tape over two of the front holes. I have ridden the bike last night and it seems the power is up. I will run with four holes and do another test and analysis and possibly go down to two holes.
FWIW, Mike Cummings

----------------------------------------------------

Ever since 1984 the local hot shot wrench at our local Yamaha dealer has been adding 4 inch diameter vents to the air filters on all of the Ventures in California Chapter #3. Over the years, this amounts to at least 30 Ventures. Specifically what he does (without knowledge or approval of Yamaha) is drill 2 1 inch holes in the front next to the battery and 2 on the opposite side near the gas filler and place round mesh plugs available from any dirt bike shop. They have foam rubber inserts which are washable and eliminate the additional "roar" from the incoming air. You effectively nearly double the intake capacity. All 6 of my Ventures had this done. I have always gotten 40 to 44 mpg when not pulling my 400 lb. trailer. With it and wife I average 35 mpg. It is inexpensive and helps top end performance and fuel economy. Hope this helps.
Steve Morris, CA Chapter #3

Last update: 12:42 PM Sunday, September 26, 2004

• VBoost Mod by Dave Getsfried
• VBoost Mod by KenTech
• Pilot Jet Sizes
• Oiled Air Filter -aka K&N
• Opening Air Filter Holes