Raptor 660 starting problem...new plug, new hoses, new oil, new radiator, rebuilt water pump, rebuilt thermostat, cleaned carb, cleaned all jets, cleaned petcock, cleaned fuel filter, turns over fine, starter and ignition are good... starts with started fluid but when I attach the tank it doesn't fire up!!! Cleaned the cards 5 times so far still no luck...all seals are tight breather screws adjusted...any help would be GREATLY appreciated!!!!!!

SOURCE: Carb on 2005 kawasaki Bayou 250

remover all plastic/ rubber parts
then soak the whole carb body and slow jet in lacquer thinner

the slow speed jet/needle circuit needs to be cleaned with just 1 strand from 18 gauge copper wire going through all passages an holes pilot circuit in pic

SOURCE: Yamaha 2001 Raptor 660, need to clean my carb

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.

SOURCE: Hyosun Scooter Carb Adjustments

Very good thought process on the adjustments. The throttle screw sets the idle speed and the air screw sets the fuel mix at idle speed. The stock setting is 1.5 turns outward. IMPORTANT > do not tighten these two adjusters down. Only screw these in until they LIGHTLY seat. Now turn each adjuster one and one half turns outward.

From this point you adjust the idle speed then adjust the air screw for fastest idle speed at that throttle screw setting. If the idle speed becomes faster than desired after adjustment, just reset the throttle screw and then reset the air screw.

A “very helpful” rating for this answer? Thanks!

Greg O'Day

• 376 Answers
• Posted on Sep 29, 2009

SOURCE: Air box and crank case fuel flooding problem

Well there only one way the fuel can get into the crankcase and that's from the fuel tank. The petcock must be draining and the float needles are not stopping the fuel flow. Do you have a prime position on the petcock? If so do not run the bike in the position. Try topping the tank off with gas and letting it sit for a while and see is the gas has gone down and then check the crankcase and see if there's fuel in it again. i still say its got to be your petcock.

Testimonial: "I will try it, thanks!"

Murtaza Akberali Versi

• 767 Answers
• Posted on Mar 02, 2010

SOURCE: I have a 03 Yamaha 660 raptor one of the carbs

Did you reset (adjust)the float inthe float chamber to tht carburator which is leaking ?
You will probabley have to adjust tht float to stop from overflowing in other words we call it flooding.
Check the float pin of wear at the tip.
Hope this helps!