Engine Modifications Recommended:
TRX 250-LT 250
Works with either stock or modified engines.
But performs best with modified engines running higher compression than stock
Works well with either stock or modified engines.
Power: Best if used when strong Midrange and Great
Top End Power is needed. Gives slightly better bottom
than 39 PWK For LT 500 power is excellent across
the entire power curve
DRI SUPER FLOW mod is a machining modification performed in house by DRI. Improved performance on all Keihin carburetors at all air speeds. Improved air flow efficiency.
Works well in all applications
Reed Cage & Intake Manifold Recommendations: Stock intake manifold should be used.
Carburetor will perform BEST when used with PYRAMID REED VALVES
Air Box Requirements:
DRI strongly recommends using the stock OEM airbox with K&N Air Filter.
Air Box Lid Off
Jet Kit Optional but recommended Jet Kit is built around settings DRI puts in Carburetors.
Kit is supplied with Richer and Leaner: Pilot Jets, Needles, Main Jets, in a polypro box.
Notes Keihin 38mm PWK A-S Carb works best with PTR Pipe & Fat Boy Silencer. It will do very well with either the Midrange or High Rev Version
Information Required From Client To Properly PreJet Their Carburetors:
List of all Engine Modifications(porting, bore size etc.)
Pipe & Silencer
Air Filter & Box. Lid On or Off
Note if any Electrical Mods have been made
Kicking Compression (measured with engine cold)
Fuel Type and Octane-PreMix Brand/Ratio
Temperature & Humidity
Type of Riding
Throttle of Choice. Thumb or Twist.
Weight of Rider
Skill Level Of Rider