Question about 2003 Triumph Speed Four

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Bike is only running on 3 cylinders but is ok when rpm above 3000

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Carb needs cleaning and new filters put in.

Posted on Oct 01, 2009

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Posted on Jan 02, 2017

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1 Answer

1200 sportster 2009 fuel inj cuts out at 3000 rpm with throttle open


Before you even start looking at your bike you need to find the fault code
How to access fault codes and what they mean, once you know the code then it makes life easier here is a link of how to retrieve the codes and what they mean, its good to print this off and keep for future use

http://www.thunder-max.com/techdocs/HarleyDiagCodes.pdf

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My 02 gszr bucks or jerks when taking off or riding below 3000 rpm then runs great when it hits 3000 or about. i can ride it but have to slip the clutch or hammer it taking off


I suggest you check the exhaust pipe on each cylinder when you start the bike in the morning. My guess is that one cylinder is not firing properly. The "cold" pipe is the bad cylinder. If you haven't done it already, stick in a set of new spark plugs. I am surprised that the fuel injection system isn't sending sending the " FI "signal. Is the air cleaner clean? Good gas?

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Rebuilt all four carbs cleaned and replace needle and seat.Bike runs on choke at idle but will not excelerate,dies when you turn the throttle. feather the throttle past 3000 rpm and it will respond but...


the ajustment need to be set where they were originaly, needle position and mixture screw. the carbs are not suppling enofe fuel, was there any torn seals or diaphrams.

Mar 15, 2010 | 1985 Yamaha FJ 1100

1 Answer

Loss of power above 3000 rpm


You have a fuel delivery problem. Open the gas cap on the bike & try. This will prove if a vacuum is happening inside the tank (plugged vent). Check fuel filter. Check fuel pump. Check fuel pressure regulator.

May 14, 2009 | 2003 Ducati ST4S

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