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Discussion Starter · #1 ·
Is the carb on an 06 4x4 500 adjustable?

I keep setting idle speed, but it drops from 1300 to 950 when the fan kicks on.

Also, it will crank right up without any choke. This makes me think it's running a little rich.
 

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Turbodog, all the 500 motors set up at the factory are rich and both bottom end and top end, but they were jetted perfectly in the midrange. You might be able to drop down one pilot jet size, but if the temp in your area drops below thirty degrees it might be harder to start.
 

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Discussion Starter · #3 ·
Thirty degrees... how do you spell that? I live in MS. Our thermometers don't go below 55.

Other than that, any idea on the rpms dropping when the fan kicks on?
 

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Turbodog, You may want to spin the fan blade by hand and see if it spins around freely or feels like it is grinding. If the fan motor is bad it will bring the rpm of the motor down. If the fan is fine then you probably need to install one size leaner pilot jet.
 

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The idle drops because the charging system is working harder to replace the juice the fan is using. When a battery starts dyeing this gets a little more noticeable. Bad battery connections can cause this also. As for cranking without the choke as long as you are not fouling plugs let her run.
 

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<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote">As for cranking without the choke as long as you are not fouling plugs let her run.<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">
That only means the pilot jet is alittle rich, but the pilot jet only comes into play from idle to 1/8th throttle and has no affect on the other 7/8ths of the throttle you have. But I have heard and seen where most atv's and utv's come from the factory alittle rich so you may be able to lean that up too by changing the needle settings or the main jet. Always take a plug reading to see what your motor is doing before changing things. You wouldn't want to lean it out to much and burn or lock the motor up. It's best to leave it like it came from the factory unless you know what your doing, atleast that way you will be safe and not trash the motor. If you take the time and play with the jetting and get it right you will notice an improvement in power and performance.
 

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Discussion Starter · #7 ·
The idle drops so far as to hear the decompression mechanism kicking in. It makes a tick tick sound.

I've sort of given up on this thing. It's only got 50 hours on it. As soon as honda comes out with anything, this thing is history.
 

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Sorry I had forgotten Mine done the exact same thing after 5 or so hours of running time. I finally figured out the throttle cable needed adjusting after I messed with the idle screw on the carb and it had no afect either way. Once I figured this out and adjusted the slack out of the cable she has run fine since then.
 
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