'til you see GOD,
Harley-Davidson engines are "anything goes". This 137 horsepower 89 CID XL
engine with a NOS nitrous oxide system is an excellent example of a "low cost"
Stage 4 engine.
Stage Four Engine Specifications
Displacement: 89 CID
Assembly: James Reeder
Crankshaft and Flywheel: H-D
Cam: Andrews N83
Carb: Mikuni HSR-45
Carb Jetting Information:
Nitrous Oxide system by NOS with 28 nitrous/32 gas jets.
Dyno Tuning Facilities:
Using the NOS jets 28 nitrous-32 gas combo I had trouble
getting consistent results. I replaced the fuel filter, cleaned out the nitrous filter,
even tried another nitrous solenoid. I finally tried another relay and it seems to be OK
now. I lowered the jets to 20 - 24 to be a little more manageable.(around 30 hp)