IslandRoad wrote on 04/04/20 at 13:24:22:Tis is the Yamaha part number for the petcock:
5LP-24500-01-00
I just ordered the Yamaha oem part 5LP-24500-01-00 from Ebay. It was $32 plus a bit of shipping and tax...
I have not cleaned the carb...I am not handy enough to do that...I am elderly.
Took 35 mile ride just now.
Seems to run a bit smoother when engine is warm and with choke pulled out slightly. Maybe 3/8th of an inch out. (Very little difference if any from no choke. More or less a hunch.)
I tried it on prime setting on petcock...I could not tell if it was more or less smooth. Thing is, with earplugs and helmet wind noise and riding on road not the smoothest, I could not tell...I'll do this tests again on a newly paved road soon.
I will look into the "white" carburetor whatever...Don't know what it is.
I use motorcycle specific oil. Next change I'll try the Shell oil suggested.
Will change sparkplug after installing the Raptor petcock.
On my latest ride, I stopped after 20 miles and put the bike in neutral an revved engine to roughly 35% or so of throttle an did not notice any difference in the way the engine sounded (slight hesitation as said in opening post.)
Thank you all for your good suggestions...