pefferlaw Posted April 26, 2011 Posted April 26, 2011 Hi i have a 1981 rd 350 lc that is hard starting cold once it is running it runs great any help would be great the top end is freash and carbs are clean with new carb boots thanks steve.
Moderator Airhead Posted April 26, 2011 Moderator Posted April 26, 2011 I assume the starter jet may be blocked or possibly you have the float bowls on the wrong carbs? Now this is a hunch as I do not know the LC setup but on my DTMX the starter (choke) sucks extra fuel up from the bottom of the float bowl through a small orifice right at the bottom, it then passes up the 'bore' in the casting to the choke plunger, I think on a twin carb setup there is a pipe connecting the two carbs for the fuel rich mixture to pass across to the cyl without a choke. Perhaps this will explain better, a picture of the workings on my DTMX so if you have the float bowls mixed up...then no fuel can be drawn through A and B ...Paul
pefferlaw Posted April 26, 2011 Author Posted April 26, 2011 Hi when i cleaned the carbs i did them one at a time but i do not know if the former owner mixed them up sounds like a place to start thanks.
Moderator Airhead Posted April 26, 2011 Moderator Posted April 26, 2011 Hi when i cleaned the carbs i did them one at a time but i do not know if the former owner mixed them up sounds like a place to start thanks. If they are not mixed up, drip some fuel into 'B' abd see if it weeps through 'A' (small hole)
pefferlaw Posted April 26, 2011 Author Posted April 26, 2011 Just one more thing if the fuel valve is left in the on postion when not running it drips out the overfill tube not shure if this is normal.
blackhat250 Posted April 26, 2011 Posted April 26, 2011 Ah peffer" the float valve is sticking , worth removing, and cleaning, maybe faulty, Worste scenario , is fuel running into crankcase, and hydraulic lock.
pefferlaw Posted April 26, 2011 Author Posted April 26, 2011 I only just joined today and thanks for the great advice now where is the float valve located sorry maybe a different wording i am a canadian eh.
Moderator Airhead Posted April 27, 2011 Moderator Posted April 27, 2011 I only just joined today and thanks for the great advice now where is the float valve located sorry maybe a different wording i am a canadian eh. It's usually in the middle, it has a tiny spring loaded plunger that rests on the float arm.
pefferlaw Posted May 6, 2011 Author Posted May 6, 2011 Thanks oldgitonabike your suggestion was the problem i guess former owner mixed them up put in new needle and seats when off thanks everyone.
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