Question about 1999 Yamaha YZF-R1

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My bikes lost power, i can clearly hear it breaking down in any gear when i give it a bit. its running on fresh premium fuel, the exup is working fine, its got me stuffed.

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Take out the plugs and "read"them,this will instantly tell you wether it's a lean or rich misfire,beyond that look at the gaps,use a snap on or similar timing light that reads out igniton voltage,then look at moving parts that wear such as TPS sensor,it may have codes that can be read by a scan tool

Posted on Apr 03, 2015

  • Daniel Roff
    Daniel Roff Apr 04, 2015

    Thanks Andrew ol let ya know how I go.

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Test or replace the spark plugs, and test the HT plug cables the resistance often goes high causing a week spark.

Posted on Apr 03, 2015

  • Daniel Roff
    Daniel Roff Apr 04, 2015

    Thanks Stan ol look into it

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Yamaha 2001 r1 been stood for 2 yrs ;got back on road ;rev needle keeps going from 0 rpm~~7000rpm all the time;bikes runs but must of lost half the power of the bike ????


Hi There,
Got this from my copy of the Yamaha workshop manual for this model

The YZF-R1 features a self-diagnosing system for the following circuits:
1. throttle position sensor
2. EXUP
3. fuel level indicator light
if any of these circuits are defective their respective condition codes will be displayed on the tachometer when the main switch is set to "ON" (irrespective of whether the engine is running or not)

1. throttle position sensor a) Disconnected b) Short-circuit c) Locked 0 - 3,000rpm
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3. Fuel level indicator light a) Improper connection 0 - 8,000rpm

It looks like you have a problem with the EXUP Valve on yours, probably seized or maybe cables not moving freely
Hope this Helps

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