CHECK FOR ‘FALSE’ AIR/COLLAPSED LINES/OTHER SUCTION SIDE ISSUES
If the cylinder can suck air into the fuel system, or any other aspect of the fuel/air system that can affect mixture occurs it will
cause inconsistent RPM readings. (increase/decrease):-
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Inspect the small hose between the airbox/manifold and the fuel pressure regulator for fit/damage.
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Check the same hose banjo eye at the airbox/manifold for torque/connection.
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Check torque on the two M6 bolts at manifold inlet tubes at each cylinder head
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Remove the air filter and check if both screws and throttle axle are still in place
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Check fuel line size, routing, condition and connections are i.a.w. manuals
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Ensure that the fuel return line is free of obstruction (check valve not stuck/incorrectly installed)
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Check filters
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Check for condition/fit of sensor connectors on airbox/manifold
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Check that fuel drains/seals are not allowing air to enter the system (eg Gascolator?)
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Check fuel tanks are not unported (the pick up pulling air from the tanks)
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Check fine screen on Pressure regulator (note only for advanced users)
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See
here for more ideas
RPM
