I have a 03 Yamaha 660 raptor one of the carbs

how is the fuel flow? i just went rounds with a mower and it turned out the tank vent was faulty stopping the amount of fuel flow to the carb. it would flow fine for a minute until it needed air in the tank and then would stop.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/kelly_69a0cf1b13789df1

My 2001 raptor 660 starts when it's cold and runs great but if I shut it off when it gets hot it does'nt start back up until it cools down

clean the filters on the petcock?

Hi Mike,
You will find that there is a problem with the carbie. It runs with the choke on because the choke engages the "enricher" circuit. The idle circuit is different a different circuit inside the carb. When just crack the throttle on, you use the pilot circuit, and then main jet with more twist of the grip. You will need to completely strip the carb, remove all jets, spray carbie cleaner throughout, and blow out all capillary tubes and holes inside the carb with compressed air. Pay particular attention to the fine holes inside the venturi near the butterfly valve. You may need to use a fine piece of wire, like a guitar string to open up any that are clogged.
There is not much else that will cause the symptoms you have. Check for air leaks about the inlet manifold also, spray some carbie cleaner about the manifold connections boots, the revs will change when it sucks up the cleaner through the leak.
Happy to talk to you more about it.
regards robotek

There are two possible reasons for this - firstly there may be a crack in the carb. bottom. On ly solution is to drain carb, remove bottom of carb and replace with new one (that is if they are available singly), the other problem might be that the gasket is leaking that seals the bottom to the carb body. Check the screws / bolts that hold this bottom part on and see if any are broken, missing, or just loose. If the anwer is no to these questions, the gasket might still have failed. Drain the carb after switching off the fuel tap or disconnecting the fuel tank, once drained remove the carb bottom and check the rubber gasket for swollen areas, breaks or even a small nick. Replace as necessary.

Sounds like the carb has over flowed and filled the crankcase with gas.
You will need to drain the oil, and re-fill it with new oil at the proper amount. Also replace the oil filter.
Clean the air filter and replace the spark plug.
Clean the carb, making sure the float and float needle are functioning properly.
That should fix you up!
RSRBOB

Drain and replace the gas with fresh.
Remove the air cleaner and spray carb cleaner into the inlet. Work your throttle a little then put everything back together and try to start it.

if it idles fine but when you give it gas you say you have no power? then you have a problem with your intake and exhaust valves.they need to be set.I have a 2003 660 raptor and it was doing the same thing and that fixed it.

MAke sure your tank vent is clear.If so you need to pull the carbs and clean the passages and jets.You may have a stuck float or needle