carb adjustment - Yamaha Raptor Forum
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post #1 of 12 (permalink) Old 05-24-2015, 01:04 AM Thread Starter
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carb adjustment

HELP!!! I have a 2001 Yamaha Raptor 660 and i have been trying to get the carbs adjusted and I just can't seem to get them how many turns out from fully seated should the air/fuel mixture be?
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post #2 of 12 (permalink) Old 05-24-2015, 07:51 AM
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I moved you into the 660 forum, get a quicker response I am sure.

Do you have a service manual for it?

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post #3 of 12 (permalink) Old 05-24-2015, 12:26 PM Thread Starter
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All I have is a disc that is like a service manual but all it says is to count the number of turns it was set to before you disassemble and clean it doesn't tell me a preset to turn them to
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post #4 of 12 (permalink) Old 05-24-2015, 01:07 PM
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Tune them, they don't have to be in one particular position.

Try 2-2.5 turns on each, you may or may not want to stagger the right carb 1/2 turn more than the left.

Mike

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post #5 of 12 (permalink) Old 05-24-2015, 06:18 PM Thread Starter
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Aight cool, I will give it a shot
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post #6 of 12 (permalink) Old 05-25-2015, 01:09 AM
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Good Luck!

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post #7 of 12 (permalink) Old 06-08-2015, 04:05 PM
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Good evening

How can I identify what pilot screw jet goes where?
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post #8 of 12 (permalink) Old 06-10-2015, 06:40 PM
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Hi I'm new to this site and kinda working on engines in general. I just bought a 2001 raptor 660 an its backfires a lot when going through the gears or slowing down. So I checked out the air filter and it was clogged with sand so I took it off to clean it and noticed there was sand going up through the air hoses into the carburetor. I'm wondering if cleaning the carb will do the trick or what else I should do or inspect?
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post #9 of 12 (permalink) Old 06-11-2015, 03:35 PM
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WAYNE - you are confusing two different things - each carb has a PILOT JET and a PILOT SCREW (sometimes called 'fuel screw'). The pilot jet controls how much fuel gets to the engine during idle and up to about 1/4 throttle. The pilot jet will have a number (probably 22.5 or close to it) on it. The pilot screw acts like a valve to adjust this fuel from the pilot jet - the jet controls the max flow, the screw just can turn flow down.

The carb also has NEEDLE jets and MAIN jets - the needle jets control fuel flow from about 1/4 to about 3/4 throttle and get moved up and down in their bore (adjusting fuel flow dynamically) by vacuum from in front of the butterfly. Main jets control flow from about 3/4 to full throttle - mains will have numbers somewhere between 140 and 170, if they are typical Mikuni brand.

So with this info in hand, what is your question now, Wayne?


Travis - this is your 3rd post on the same issue - the moderator is gonna get mad at you!

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Last edited by QuadManiac; 06-11-2015 at 03:43 PM.
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post #10 of 12 (permalink) Old 02-09-2017, 12:55 PM
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my 660 bogs down when in 5th gear and i need to know if i need to adjust the carbs or whats wrong with it
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