Question about 1999 Yamaha FZS 600 Fazer

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I have a 99 "t" 600 fazer (thundercat engine)When moving, spedo goes up and down randomly (a small roundabout at 165 mph exited it at 25) shortly after that started, the engine stopped behaving itself. Engine feels like fuel starvation and plugs show its running very lean. I have replaced the inlet rubbers which were perished also air filter is new, plugs are good with good spark i have a fuel filter on order. I am worried that the spedo problem could be connected. I noticed the speed sensor is connected to the ECU could this cause the engine to suddenly have no power if the sensor is faulty? Has any one else had any thing similar happen to them? The bike has done 45000 miles and ran well before this started, altho very slightly lumpy at low speeds, i was planning to get carbs balanced soon anyway.

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Ok. If the tach is being radicl and the engine joins in we have a clear indiction of a loose or otherwise faulty connection at the coil or a defectine coil itself.. Chk that connection poit for any descrepencies , Good Luck

Posted on Nov 14, 2009

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