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Old 04-04-2011, 11:59 PM   #1 (permalink)
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How to clean a carb

Ok, i've seen this problem come up alot lately....sooo..i thought i'd post a thread on how to clean a carb. now..first off..let me say..not everyone will have the same carb !..sooo..with that being said..let's move on. first..turn your gas off on your tank, next..loosen the intake boot screw to the cylinder, and also the intake boot from the air box to the carb, now..if you own a trx300 ?..( makes no difference what year )..on the right hand side of the carb..you will see a tiny screw holding the side cover on the carb, remove it..next..on top of that same side of the carb..you will see a 10mm nut..this is your throttle cable tie down nut...loosen it...now remove the side cover...reach in..and lift the throttle cam up..as your doing this..lift the throttle cable's end out of the cam...now on the left top side of the carb..is your choke knob..it's a 14mm..loosen it..remove it..becareful not to strip the threads..it's plastic !!..pull the choke out of the carb..you should now be able to remove the carb from the bike ..now..take it over to a good clean..wel lighted area...a nice work bench does wonders !..if you happen to have a bench vise ? ( these come in very handy at times ! )..put the carb in the jaws of the vise upside down..you should now be looking at 4 screws holding the float bowl on ?..if your not..you have your carb right side up..lol. now..remove those 4 screws..lift the bowl off the carb..your now looking at the guts of your carb..there is roughly 3 jets your looking to find ?..your main jet is the tall brass one..your idle jet is the small jet down inside a holder right next to it..there is a starter jet..( on some models..they are on the side of where the rubber plug is )..on some models..they are sitting right where that rubber plug is. now..with a flat head screw driver..remove the main jet from the carb..you can also use a 7mm socket to remove the whole assmebly..this is how i do it...as you will need to clean the whole thing..lay it on the bench..now..with a narrower flat head screw driver..remove the idle jet from the carb..lay it on the bench. now..with a very small screw driver ... a jewlers screw driver works great..or you can even use a small spoke from an old motor cycle wheel..anything that you can use as a punch..thats small enough to tap the float's holding pin out. after you get the float's holder pin out..pull the float and float needle out..becareful not to loose or drop the float needle !..lay it on the bench. now..on one side ( depends on which way you got your carb in the vise ? ) there is your pilot/fuel mixture screw sitting on the outside of your carbs float bowl....as we have mentioned..count the amount of turns you go inwards lightly !.but..in this case..were not gonna cover that..( that part is covered later )..remove the pilot needle..be very careful when you remove it !!..there is a tiny washer that some ppl drop..and the cats drag off..and never see them again !..lol. now..if your lucky ?..when you remove this needle..you will get all the parts out at once !..if your luck is like mine..you always get the tiny o-ring staying in the bottom of that hole !..lmao....if it stays in there..try to dig it out with some kind of pick..a mechanics pick works great !..after you get that out..look to see if you missed any jets still in the carb ?..most times..i leave the starter jet ( the tiny jet that's either where the rubber plug is ?..or on the side where the rubber plug is ?..i hardley ever take this out..as most try to strip out when removing them !..but if you can get it out..all the better !..now..if your carb has that rubber plug..remove it. ..take the carb out of the vise..flip it right side up..remove the 4 screws from the top cover..as you get down to getting that last screw out..the top will want to spring off..this is because it's got a large spring under it..hold the top down..as your removing that last screw..now lift the cover off..remove the spring..lift the main jet's plunger out of the carb..it's round..and has a rubber diaphram around it, now..with your carb spray cleaner..spray down inside the top..all the holes..everything..BE VERY CAREFUL NOT TO GET THIS IN YOUR EYES !!..IT BURNS !..LOL..sooo..please wear safety glasses !!..with your air compresser..blow the carb out really good..every nook and cranny you can stick that air too. ok..now comes the hard part..as this will make or break your carb cleaning..lol. grab your main jet..with some wd-40..and one wire from a wire brush..spray the main jet down..work that wire through the middle of that jet...then with some air..blow it out..if you got a bench grinder...and has a wire wheel on it..this next part is a breeze..if not..your gonna have to do it old school..depending on which way you go..i use my bench grinder with a wire wheel..( faster !..lol ) i clean the outside of the main jet holder..as you can tell..this has a few small holes on the outside of it ??..these have to be cleaned..carb cleaner ( gum out )..and that wire..poke it through the holes..then blow it out with air. now..grab the idle jet..and do the same thing to it. inspect your float needle..is it dirty ?..gummed up ?..if not..leave it alone. if it is..try taking some very fine steel wool..and lighty.. AND I MEAN LIGHTLY..scuff the outside of the needle..do not rub the tip !!!..now comes the easy part..putting it all back together..and i'm sure you know where everything goes ??..if not..main jet goes in tall holder..idle jet goes in right next to that..and if you removed the starter jet..that's easy to see where it goes..now..lay the float assembly back in the holder..slide the float's holder through the tabs..put the bowl back on..flip the carb right side up..slide your main jet plunger back down in the carb..make sure you put the rubber part back in the right way..there is a round outter part..with a tiny hole in the middle of it..slide the big spring down in the top..place the top on..while holding the top down..get a screw started..then put the other 3 in. now..turn the carb back over upside down..remember that jet needle that had the tiny washer that the cat draged off ?..slide the spring on..then the washer that you had to fight the cat to get back..then the tiny o-ring..put the needle down in the carb..turn the needle down all the way..go very easy..do not over tighten it !..if you break the tip off in the carb..your screwed !..lightly seat the needle down in the carb..now back the needle out 2 1/2 turns..count the turns as your watching the very end of the slot in the screw..so you will know when your turns are 2 1/2 turns out. now put the carb back in the bike. i hope this helps everyone out. if you own a trx250..the top of the carb is flat..3 screws hold it on..this is a little different set up. id get into that..but thats another chapter..lol. added : don't forget to clean the float needle seat with some carb cleaner spray and a Q-tip !..very important.
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Last edited by shadetree; 09-19-2011 at 11:08 AM.
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Old 04-05-2011, 01:20 AM   #2 (permalink)
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Thanks man this is gonna help a lot of people out!!!
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Old 04-05-2011, 06:33 AM   #3 (permalink)
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Well Done!
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Old 04-05-2011, 08:21 AM   #4 (permalink)
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very nice very nice.
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Old 04-05-2011, 08:49 AM   #5 (permalink)
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Thanks for taking the time to write this up for people Shadetree.

I want to see your post how to synchronize your carbs on your Magna's! lol, especially if their a CV type of carb,which I don't think yours are for the year of your bikes.(now those are fun to sync!)
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Old 04-05-2011, 10:24 AM   #6 (permalink)
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what does it mean to seat the pilot screw.
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Old 04-05-2011, 10:41 AM   #7 (permalink)
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Quote:
Originally Posted by cmjohn27 View Post
what does it mean to seat the pilot screw.
it means to tighten it down..as in screw it down to where it stops..this is what seat the needle means.
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Old 04-05-2011, 02:28 PM   #8 (permalink)
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Congrats. The longest run on sentence at the forums that I have ever seen...lol

Just a joke. I know what shadetree can do and does do. Nobody has to remind me. He and I made a trade after driving 5 hrs one way. He contributed a 96 trx300fw and I contributed lots of green. Relax, it was just a joke. Shadetree and I talk from time to time. If he has a problem, he will let me know! Lol
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1996 TRX300FW - ITP Mudlites Warn XT25 (Current Project)
2001 Suzuki LT A50
2003 TRX300EX
2006 Polaris Sportsman 90 - 2 inch lift
2006 TRX250EX - Maxxis Razrs
2007 Suzuki King Quad 700 4x4 - ITP Mudlite XL
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Old 04-13-2011, 04:14 PM   #9 (permalink)
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Well we are at it again. 04 TRX400 FA. Can't fix it. Can't stop it from flooding on the idle circuit.
Choke plug was changed. Cable was changed, badly rusted. New float needle. New spark plug.
Rebuilt head. Will not idle. Rev it up and runs not bad. When it tries to idle it fires about every
6 - 8th time around. Shop is so full of gas fumes in 30 seconds you have to leave. This carb was BAD when i got it. Anyone got a used carb for this thing ? Any ideas ? I'm wondering if it is not an ignition problem. Thanks in advance.
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Old 04-17-2011, 02:40 PM   #10 (permalink)
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Quote:
Originally Posted by chipset View Post
Well we are at it again. 04 TRX400 FA. Can't fix it. Can't stop it from flooding on the idle circuit.
Choke plug was changed. Cable was changed, badly rusted. New float needle. New spark plug.
Rebuilt head. Will not idle. Rev it up and runs not bad. When it tries to idle it fires about every
6 - 8th time around. Shop is so full of gas fumes in 30 seconds you have to leave. This carb was BAD when i got it. Anyone got a used carb for this thing ? Any ideas ? I'm wondering if it is not an ignition problem. Thanks in advance.
check your timming..sounds like your timming got off. you say you rebuilt the top end..you may have your timming off on your bike.
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