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I bought an 02 RC51 and I found it sputters around 61/2 rpm. Could it be spark plugs or fuel injection. Any ideas or tricks would be totally appreciated. thank you. My names Eric
 

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Mine has the same problem but worse. Before it was a coil connector problem but now its something else and happens with any load on the engine at any rpm once it gets hot. Feels like its on the rear cylinder. Already new fuel pump, new coils, new leads, new plugs, new fuel regulator. No flashing FI light or codes showing. I was thinking it might be a TPS but that would throw a code and FI flash on the dash. Maybe its a wiring issue under the tank or CDI box..It jerks pretty hard and its damaging the gearbox
 
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