Ok. So I just got this raptor 660 ,problem, it will start and idle with a little Hesitation at idle When I go to hit the throttle it immediately shuts off .sometimes I can feather the throttle and get it to rev a little bit. All Is rev Limiters were bypassed, Carbs are clean and new Any idea what could be Causing this will post video
Clogged/faulty petcock, plugged fuel filter.. Shoot some starting fluid in the air filter while trying to rev it. If it will rev then you know your problem is fuel related.
You say "When I go to hit the throttle it immediately shuts off "... if so it is NOT petcock position, petcock filter or float bowl related - these would take many seconds to minutes to manifest.
Assuming the RPM limiters are PROPERLY bypassed (describe how they were bypassed) it's 99% likely your carbs are dirty or incorrectly jetted...
What are your airbox and exhaust mods and main and pilot jet numbers?
Give us history - when did this start? When did it last run properly? What happened in between? Etc., etc.
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