Raptor 660 Carburetor Cleaning and Tuning Guide 

I've owned an '01 Raptor 660 for almost 15 years now, and this video showed me multiple adjustments that I didn't even know existed! Excellent Video! Thank you for your time and knowledge!

Man I really appreciate this video, it is the best one on RU-vid. Followed your steps and got my newly bought 01 660 running great. Thanks

Great job on making this a very clear & in depth tutorial

I just wanted to say you did a great job making this video thanks

Excellent job!

great video !!! thank you , very detailed helps me out !!!!

Good job on this video thanks 👌🏽

Great Video!

Good deal best video out there

Great video. Thanks

Sweet video

Nice video 👍🏻

Cool vid. Thanks.

Merci pour la vidéo .

Good video

Any tips for sputtering on the low rev? When I’m on it in 2nd, 3rd, or 4th gear, no issues. But when I drop my rev down in any of those gears the bike wants to cut out on me. But the minute I give it more throttle, the issue goes away.

I have a 01’ Raptor 660 bore kit (bored at 29) (11.1 piston )bought a Mikuni carburetor and wanted to No what would be a good carburetor rebuild kit for this set up .

So what mains jets and pilot settings are on your 686 raptor with the niche kit?

Hello ! My exhaust turn red, so i think i have to adjust my air screws, did the adjustment is the same for the 2 carbs ? 2,5 turn for the left and right carb or 2,5 for left and other for right ? Thanks youuu (sorry for my english)

my spark is too white , what i need to do?

My carb is leaking fuel what do u guys recommend buy a carb rebuild repair kit on ebay or the entire carb

How to mod my carb for turbo much help needed I was told the bowls have to be sealed and to add pressure too. If you could help me with where to begin looking would be great

Fuel screw ratio 3L / 2r ?

can this carburetor be used on a ninja 250 motorbike?

Quick question so I had my raptor 660 for about 3 day the old owner let it sit a lot and I took it in a ride day I got it ran great intel today once I got higher in the rpm it started acting like there was a rev limit not sure what causing it imma clean it out tomorrow see if that fixes it if it doesn’t should I put a bigger jet in it

I just picked up a 02 raptor 660 with aftermarket carbs, when I bought the bike it wouldn’t idle and it would cut out around quarter to half throttle. So I messed with the two air fuel ratio screws and got it to idle. But in the transition from quarter to half throttle it starts back firing and bogging down and dies. It’s been cleaned and looks super clean and I’m running race fuel to hopefully clean anything out because it’s sat for around a year without being ran. I’ve had a mechanic look and mess around with it for several hours and he wasn’t quite sure what to do.

Im currently considering trying to shove a set of these carbs onto my 44ci(724cc) Briggs vtwin. Should be a hell of alot more adjustable than the stock carb, considering that the only adjustment on the stock carb is idle speed..

Great video! I just don’t understand why my raptor will backfire like on decel and only start with the choke until it is warmed up

Does anyone know an easy way to get out the base that the float needle?

The warrior 350 is temperamental as well

Hey I have a 2001 raptor 660 it has a little whistle but I can’t find it I tried everything .. the quad runs good when I’m pressing the throttle less than half but when I press more than half it just boggs and backfires .. any help

Thanks for the video, just purchased a new carb for my 660. I am curious, the atv boggs down at 1/2 throttle, but otherwise runs great. I did no adjustments to the new carb. Will adjusting just the diaphragms help with it running lean at WOT?

I'm hoping you can help me figure this out, by the way the video was on point. I bought a new carb off Amazon (1PZ) got it tuned in per this video, I got both air/fuel screws 3 turns out (I've also tried 2 and 2.5 turns) and I've adjusted the needles ever way you could think of. Left carb needle is set on the 3rd notch from bottom, and right carb on the 1st notch from bottom or I can do this in reverse left and right carb at the same position on the needles being left on 1 and right on 3 this is where I have found it to run the best. WITHOUT the air filter and lid on it runs excellent, with it all on it runs good until you go full throttle, then it's runs rough. Other than that it's perfect just seems like it needs more air or gas depending on which needle is set on the first notch. I have checked the valves and they in spec. Any idea what the problem would be. Any info would be appreciated THANKS. I tried to explain everything I've done without writing a book.

What if my fuel screws are different? 1 is set at 1.5 turns out and the other is set at 3 turns out.. my quad runs and idles fine tho

I noticed that when you installed your idle/air screws, you failed to use a rubber O ring with the screw, spring, and washer.

Very informative vid thanks. Subscribed! I think my problem may be float height. Anytime I pop a wheelie it bogs down till I give it more than a little over 50% more throttle in the middle of a wheelie. Also sound like it’s running out of fuel after a quick full throttle run. Might try and tackle it again soon after watching this vid. Thanks

I just had my carbs rebuilt. And my raptor runs “okay.” Basically from 1st-4th gear it runs decent. But starts to bawg down in 5th and 6th when I give it gas. Almost like it doesn’t wanna get up and go. The performance is for sure lacking. Any suggestions?

Great video it was super helpful. My bike was starting but would not run so I got mine apart and cleaned everything but one of my air fuel ratio screws was sheared inside the hole. I got that out and assume that was why it was not running but am having trouble finding a new one. Is a longer aftermarket one okay or should do I need to buy while carb rebuild kit?

Mine bog in the 50-100 % range ? Somebody help me out .. bigger main jet ?

To adjust my needles do I need to take apart the whole carb or can I just do it from the top ?

Do you have a link to the carbs you bought on Amazon? Mine are trashed

What jet kit did you use for the Chinese carbs? I’ve noticed they won’t take oem pilot jets as the threads for them are different on both carbs.

Nice guides man ! My raptor 660 is backfiring a lot. Do u thing it is caused by bad carburator tuning or anything else ?

Great Video. I cleaned out my carb thoroughly but i guess it wasnt enough. Started leaking gas everywhere very fast. Im guessing the float needle wasnt working properly. So i bought a Rebuild Kit from a local ATV shop. They were telling me to replace every single gasket & metal ring. Would you happen to know where they all are? I would like to use every single piece that came with the kit just so i get a great running carb.

what size jets do you have in the carb? and how tall is your floats? cant get mine to run right is it air/ fuel screw ?

Hey guys, I have a 2004 Yamaha raptor 660r with a dg slip on. What do I have to do to the carburetor??? No mods except the slip on if anyone know let me know please. have a good day.

I know that this video is old but does the fuel mixture screw have a o ring

Do you need to change the air pilot screws when going bigger on the main and pilot jets?

What would you recommend... I have a 03 raptor 660 it has K&N air filter with after market exhaust, it had jets it in with no numbers but I’ve done some research saying I need #140-145 mains #22.5 piolts, #95 starter jet, and needle clips at #3 position, and floats at 13mm from bowl edge is that right? But also people were saying some of my problem could be the reverse rev limiter wire that it needs to be grounded bc it will cause the bike to backfire and pop when giving any type of gas and that’s what mine does it starts and idles fine but when I try to give it any type of throttle it pops and backfires what would you recommend? Thank you for this video!

Hey can i ask ,..how do i get idle down !! ???

Okay so I had my ATV shipped in parts to where I am now (Pakistan) it’s a euro model. Since putting it back together I’ve had a few issues (I’ve gone by the manual guidebook. . Carb problem. I cleaned the filter out and doused it with engine oil to make it stick and I blowed and pumped air through the carb on taking the air filter out and little little bits of silver would come out and be visible in the petrol. Didn’t work! Overflow pipes are throwing out alot of fuel and to basically stop that and prevent it I’m having to leave the fuel on half or less than half on like literally a little up from off. Now I need to open up the carb and clean it n check the float levels. Can anybody guide me or give me any advice as where I am now there isn’t a mechanic or anyone who specialises in these machines so I’m gonna have to go about it myself. . I have a tooth on the front sprocket broken, which I think may have something to do with the bike not going in neural when switched on. My question is if I were to get it repaired as it’s only 1 tooth on the cog would it be okay or would it be best to replace the part as a whole (remember I’m in Pakistan there’s no part market for this and will be a long wait in the post) so could it be possible to repair that sprocket cog. The bike does go in neutral but only when switched off does not happen when started. . Choke problem. The chokes basically still too high or fast even at the lowest point as in the bike still warms up even when it doesn’t need to and then gradually heats to a point where the bike turns off and the cooling fan comes on. . Any help would be very much appreciated! Thanks for reading, i will take pictures and upload in where I could get any assistance. .

Those 2 small pilot air jets, is the left one sopossed to have a slightly smaller opening when looking threw the jet then the right?

I have a raptor 660 and it breaks up and back firing at a little over 50 percent would that be the main jet or the needle? Once it gets past that point it’s fine but then when slowing down it starts back fires again.

How would you adjust a high idle?

I cant the diaphragms back in mine. Weird yours just sat right in. I cant get then im the ring groove they wont stay there. Sigh

What carb did you purchase off of Amazon bc I bought one and it didn’t work even after tuning? I’m currently on my 3rd carb in my 04 660 and getting a little desperate to get her running again

So them cheap carbs run good? I'm about to get my 660 running after sitting years..

Got a 2004 660 no upgrades everything stock guy I purchased it from said the carb got rebuilt so idle good runs good but when I hold on clutch and slow down it revs really high? Let go of clutch revs back down and also when going down hill if I'm holding in clutch if I'm not giving little gas on way down it turns off? Any ideas thank you and great video

Are the aftermarket amazon/etc carburetors any good? They're soo super inexpensive I feel like they might be garbage. Also,do the come all pre-set and adjusted ready to go?

I just got a 2004 660 from a guy it ran funny at first but he told me its just been sitting and I have to clean the carb. Anyways now it idles nice but dies giving it a little gas. It runs better on choke but still dies. I've adjusted the airflow to 2 and 1/2 turns on both carbs and put the needle one above the lowest. Wondering if you could help me trouble shoot it. Also, when pressing the butterfly throttle sometimes the bike gets stuck at a high rev even after releasing the throttle.

What brand carb did you buy

I have a raptor 660 2005. It just had stage 2 dyno jet jets put in ran mint. I cracked the case a tiny bit had a shop do the work replace a ton of parts but carbs stay the same. Now it's back it back fired when let off the cash bad how can I fix this

Hey why does my raptor 660 sputter when I’m riding it at full throttle I have an aftermarket exhaust and I got new #170 main jets

I just watched the video and it was great. I installed a carburetor set on a raptor 660 it runs great other then when I barley crack the throttle. Could it be the fuel mixture screw, I think that’s what it’s called

Tuning my grizzly 660

What does that hose on the top in middle of carb go to? And whats all that called

One quick question

which side is left carb and right carb... my main jets were 145 left (near throttle cable) right 140.. is that correct?

I put bran new carb on my 660r 2002 I have high rpm bog at full throttle what do I do ? It a bran new carb it bogs at full throttle in gear

Nice. Except you left out the Tuning part.

Hows the chinese carb doing, id defo have stayed with mikini oem

Is that a OEM carburetor for 50 bucks?

Take those Phillip screws a toss them in the trash and replace them with Allen bolts

How the heck do YOY move it that makes no sense

O ya those carbs are JUNK I purchased a raptor 660 with those pos China carbs backfire bogging wouldn't idle tossed a set of factory carbs on no problem Set your float level with a clear hose that's the easiest way I have found

Any tips for sputtering on the low rev? When I’m on it in 2nd, 3rd, or 4th gear, no issues. But when I drop my rev down in any of those gears the bike wants to cut out on me. But the minute I give it more throttle, the issue goes away.