Tps And Ultrasonic Carb Cleaning.

Have been riding the Bonnie for couple of weeks now. It is running great except it occasionally cuts out. This happens when idling e.g. at traffic lights. Not all the time and more prone to happen if on incline, up or down hill. Starts up then rides and pulls v well. Symptoms usually is a drop in idle to about 900rpm then dies. If you notice it and blip throttle, it will settle back down to normal idle and not die. Could it be float heights? Pilot screw adjustment? Any advice appreciated.

 

You adjective of a "stumble" is exactly how I would describe it. Its carb engine BTW. I set up carbs as per jenks bolts performance and pilot is 2.75 turns out. Not a massive issue but will check for air leaks.

 

After running the bike for a good few weeks I decided I would look at making some minor adjustments to the pilot air mixture screws to remove the occasional "stumble" to below idle I had been experiencing. To facilitate this and for easy access whilst in situ, I have fitted some knurled thumb screw types. OK this did involve having to remove the carbs....again.... to fit but now I can make minor adjustments accurately and with little fuss. I have gone back to 2.5turns out and there is no more "stumble" so far. Whether it's the slight adjustment of number of turns out or achieved a perfect air tight seal from all rubbers when reassembling is a mute point. Happy anyhow and running sweet.