Her kommer der tekniske informationer om Yamaha’s XJ 900 serie fra 1983 – 1994.

Det bliver ikke det samme som at få stillet værksteds manualen til rådighed, det er for stor en opgave, og nogle vil nok blive ganske sure på mig, og det er ikke mit mål med siden.

Men jeg vil prøve at samle alle de tekniske informationer der er nødvendige, for at Vi kan holde Vores fantastiske Yamaha XJ900 motorcykler kørende, og vedligeholde dem.

Yamaha XJ900 Carb spes.

Years & Models: 1983-4 XJ900RK/RL and XJ900P Police models
Carb Manufacturer: Mikuni
Carb Series: BS35/BS36
Carb Model ID: 31A00
Main FUEL Jet Size: #102.5
Pilot FUEL Jet Size: #40
Main AIR Jet Size: #45 (non-removable, in carb throat)
Pilot AIR Jet Size: #160
AIR COMPENSATOR Jet Size: not used
Starter FUEL Jet Size: #32.5 (non-replaceable, in float bowl)
Main jet NEEDLE ID: #4HZ22 (900RK) or 4HZ26-3 (900RL and Police)
Main needle JET Size: #Y-0, style #318 (the main needle JET is also known as the “power valve” or “emulsion tube”).
Float Valve Seat Size: 2.0mm, uses a longer float valve needle and the needle is not clipped to the float arm.
Fuel Level in float bowls: 5.0mm +/- 1mm
Idle RPM’s: 1100 rpms

Although not part of your carbs, your valve clearances should be considered as part of your “intake system”, so here are those specs, too. Note that valve clearances should be measured with the engine “cold”, meaning 70-degrees Fahrenheit or less:

Valve Clearance Intake: 0.11 – 0.15mm
Valve Clearance Exhaust: 0.16 – 0.20mm

Years & Models: XJ900 model 58L
Carb Manufacturer: Mikuni
Carb Series: BS36
Carb Model ID: 58L00
Main FUEL Jet Size: #107.5
Pilot FUEL Jet Size: #40
Main AIR Jet Size: #45 (non-removable, in carb throat)
Pilot AIR Jet Size: #160
AIR COMPENSATOR Jet Size: not used
Starter FUEL Jet Size: #35 (non-replaceable, in float bowl)
Main jet NEEDLE ID: #5FZ62-3
Main needle JET Size: #Y-0, style #318 (the main needle JET is also known as the “power valve” or “emulsion tube”).
Float Valve Seat Size: 2.3mm, uses a shorter float valve needle and the needle is clipped to the float arm.
Fuel Level in float bowls: 5.0mm +/- 1mm
Idle RPM’s: 1050 rpms

Although not part of your carbs, your valve clearances should be considered as part of your “intake system”, so here are those specs, too. Note that valve clearances should be measured with the engine “cold”, meaning 70-degrees Fahrenheit or less:

Valve Clearance Intake: 0.11 – 0.15mm
Valve Clearance Exhaust: 0.16 – 0.20mm

Years & Models: 1991-4 XJ900 models 4BB1, 4BB2
Carb Manufacturer: Mikuni
Carb Series: BS36
Carb Model ID: various
Main FUEL Jet Size: #100
Pilot FUEL Jet Size: #40
Main AIR Jet Size: #45 (non-removable, in carb throat)
Pilot AIR Jet Size: #200
AIR COMPENSATOR Jet Size: not used
Starter FUEL Jet Size: #35 (non-replaceable, in float bowl)
Main jet NEEDLE ID: #5FZ10-3
Main needle JET Size: #Y-0, style #318 (the main needle JET is also known as the “power valve” or “emulsion tube”).
Fuel Level in float bowls: 5.0mm +/- 1mm
Idle RPM’s: 1100 rpms

Although not part of your carbs, your valve clearances should be considered as part of your “intake system”, so here are those specs, too. Note that valve clearances should be measured with the engine “cold”, meaning 70-degrees Fahrenheit or less:

Valve Clearance Intake: 0.11 – 0.15mm
Valve Clearance Exhaust: 0.16 – 0.20mm