Technical changes in busa since 1999?

nope pretty much the same
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I'm not too technically minded, but I know a few changes:

- recall on the cam chain tensioner
- later models (2001 onwards??) have stainless pipes, not black ones
- clutch parts changed in later models
- rear subframe change from alloy to steel after 2000
- indicator lenses went to clear in later models

I'm sure there are other changes too though...
 
No changes in the brakes . 186mph restrictor in 2001. other than that just cosmedic changes
 
fuel pump went internal, starter revised, Passing switch, hazard lt. sw., head lt. cuts off when starting.
 
From Suzuki + Haynes manuals:

1999 (GSX1300R-X) - 1st model year.

2000 (GSX1300R-Y):
- Crankcase breather arrangement changed - no oil catch tank + larger breather housing; resulting in a smaller oil capacity.
-Clutch spring length + spring support bolt length increased.
- Fuel feed + return hoses changed + re-routed. Design of fuel level sensor + low level warning switch changed.

2001 (GSX1300R-K1):
- Cam chain tensioner design changed along with its housing to allow reception of oil from the front passage in the crankcase.
- Fuel pump moved inside the tank, incorporating the fuel filter and pressure regulator as well as a mesh strainer and a new fuel level sensor and low level warning switch. Having the pressure regulator inside the tank eliminated the need of the fuel return hose from the delivery rail on the throttle bodies, with the consequence being that the supply hose and fuel delivery rail arrangement was changed.

2002 (GSX1300R-K2):
- Clutch plate arrangement modified to incorporate an anti-rattle spring and spring seat. Clutch release cylinder piston and bore were reduced in diameter.
- Exhaust system incorporates an oxygen sensor which communicated with the ECM to reduce emission levels. To do this, the PAIR system control valve is triggered by a solenoid that is controlled by the ECM.

2003 (GSX1300R-K3):
- Incorporated a torque limiter on the motor idle/reduction gear train to dampen initial torque and reduce stress on individual components.

2004 (GSX1300R-K4):
- No significant changes.

2005 (GSX1300R-K5):
- Headlight electronically turned off during engine start to reduce battery load.
- Graphite LE edition made just slightly faster than other editions.
- First year of clear plastic front turn signals.

2006 (GSX1300R-K6):
- No significant changes.
 
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