1 Throttle Stumble Fri Mar 09, 2018 6:31 pm
flyinglow
Silver member
On my 85 K100RT, when at idle fully warmed up, on the center stand, and I blip the throttle, the engine rpm hesitates for a second then takes off. It starts fairly well but takes two or three tries, with the choke on the number one position, to get it idling nice. Once running and warm it idles very smooth, at about 950 rpm, and runs smooth at all rpms. I checked for vacuum leaks at the rubber boots to the throttle body, all ok, and replaced all the rubber vacuum lines and caps on the throttle bodies. The crank case breather Z tube looks new so I didn't replace it. I removed, cleaned and checked the spray pattern on all the injectors. I replaced the incoming and return fuel lines and the air cleaner. Checked, re-gaped and cleaned the spark plugs. I used a pressure gauge and checked the fuel pressure, and that is good. I also checked the synchronization of the throttle bodies and all are matched very close. Overall the engine runs great, just hesitates if I apply the throttle quickly. I removed and cleaned the ground wires under the tank and at the rear of the bike. It would be nice to get rid of the hesitation if possible. I purchased this used last year so I have not ridden it except at the test ride. It has about 30,000 miles. Any ideas? Thanks, Jim