Rd350 floats sticking

[rickdecollo]

I have 2 RD350s, a 73 and 74. One is pre-mix, the other autolube. Both were restored and run well. A few months ago both began to flood on the choke side carburetor as soon as fuel valve was opened, flooding that side of the engine.  A few gentle taps on bowl will usually get floats buoyant but what a pain! Does anyone have this problem or know what's going on?

[Jspooner]

Hard to say without seeing the inside of the carbs but I would start by pulling the carbs apart and thoroughly cleaning them.

[rickdecollo]

I should have mentioned that both carbs are completely clean.

[m in sc]

id say theres shit behind the seat, regardless of how clean the carbs were going on, stuff can come in from the fuel line/petcock or tank and cause this. were the needles replaced with viton tip ones? if not, id consider it.

[Barrie]

Plus 1 on that, sound advise

[rickdecollo]

I will open them and inspect. What are viton tips?  Is that something that hvc carries?

[85RZwade]

Viton is like rubber, seals well against the brass seat.
Wade

[SoCal250]

I will open them and inspect. What are viton tips?  Is that something that hvc carries?

Economy carries them Mikuni Viton Tip Needle Valve Assembly

[rickdecollo]

Awesome thanks for the replies!!