Have a problem starting the RU started about a year ago and ive tried cleaning the carbs (5times) a new CDI changed te coils and still have a problem any body got any other ideas. It will start but you have to hold the throttle open 1/3 way to get it to fire then hold hte throttle until its warm. Once warm the throttle response is rubbish until about 4000rpm then not as snappy as it once was its done 45K but been serviced regularly, Any ideas welcome...please.

Hi There,

it still sounds like a carb problem if you have to hold the throttle open to start it,I bet it starts ok once warm !Clean the carbs again and make sure you blow out every jet and oriface to make sure they are clean. the next thing to try would be the ignition sensor on the end of the crank apart from that the only other thing it could be would be valve clearences closing up due to the mileage and since you would have to pull the carbs off again you might as well check them since your that far involved ?

Hope this helps

Regards

Bill

Could be the exup valve is seized?

Just a thought.

Sounds like a carb issue though.

Sounds like the emulsion tubes are worn, they go oval shaped after time.

I think its sucking air in from the wrong places. When you took the carbs off did you change the mounting connectors? If they suck air they won't suck fuel.