Honda ATV Forum
Go Back   Honda ATV Forum > Honda ATV Technical Discussions > Repair & Maintenance

Repair & Maintenance Having problems? Doing a rebuild? All Repair/Maintenance Discussions here.

Reply
 
LinkBack Thread Tools Display Modes
Old 03-16-2012, 12:07 AM   #1 (permalink)
Super Moderator
Supporting Member
 
shadetree's Avatar
 
Member #2048
Join Date: Feb 2010
Location: north little rock, ar.
View shadetree's Photo Gallery(0)
Posts: 18,749
Liked: 129 times
how to over haul a trx250 carb ( not for trx250 recon's ).

Ok, as some of you know..i posted a carb cleaning on a trx300 awhile back, and like i said back then..i would do a follow up on a trx250 utility carb..sooo..here you are !..i'll try to cover as much as i can..but i can tell you right now..it's almost the same as the trx300..exceptttttt..with a few changes in carb design..and jet sizes !. ok..ya'll already know the basics of the lower part for the bowl..jets..float..so forth..soo..i'm gonna skip that part..as you should know ??.. onto the process..on the trx250 carb..the main thing that is different..is the throttle cable side...and the top side..these two thing's alone...are the main difference between a trx300..and a trx250 utility carb..on the right hand side of the carb..once you remove it..you will notice there are two seperate parts to the throttle cam..and the top part..which i call the slidder that operates the main jet needle...we'll skip this part for right now..and come back to it..for now..we're gonna start with the top....oh..and i highly say..have a carb rebuild kit before you start any and all work on any carb !!..any way..find you a well lit lighted clean area....have a phillips screw driver..standard screw driver..some gum out carb spray cleaner <--- i use this alot..and i know it works !!. now..remove the 3 phillip screw's from the top..set the top off to the side..pry the old gasket off ( if your lucky enough to still have one on it ? )..throw it away..now..on the top of your slidder cam..you see that phillips screw ??..it moves with the butter fly when you raise and lower the throttle cam..remove it..now..see that plastic thing with a spring wrapped around it..and it's hooked to the upper cam part..and the other end is hooked to the arm inside the slidder..raise the slidder up enough..to pry the spring off the arm inside the slidder..once you do this ?..you should be able to lift the slidder out of the carb's bore. once you get the slidder out..look down in the very bottom of the slidder..see those 2 small phillip screws ?..they can be a pain to remove..if they have never been out ??!!..once you remove them..that metal arm will come out of the slidder..now just push..or dump the main jet needle out of it. if you notice..it has or should have !!..lol..a tiny c-clip..and it SHOULD BE ?!..clipped into the middle groove of the main jet needle..AS THIS IS THE STOCK SETTING!. there are 5 grooves..the middle groove is where your gonna put the new c-clip that came in your carb kit..back on the new main jet needle. new clip on..main jet needle stuck back down into the slidder..start one of those small screws through the metal arm..and try to hold it in place..as you stick it back down into the slidder..get it in..then do the other..once this is done, lay it off to the side. now flip the carb upside down..remove the 4 screws that are holding the float bowl on, remove the gasket from the float bowl..trash it, remove the baffle around the main jet..very carefully..tap out the metal round pin holding in the float, remove the float needle..trash it..lay the float off to the side for now. remove the main jet and main jet holder ( it's the tall one ).remove the idle jet..( it's right next to it )..but down inside the hole, remove the black plastic rubber plug..DO NOT TRASH THIS !!.YOUR GONNA RE-USE THIS..AND IT DOES NOT COME IN A KIT !!. see that small jet on the side of the carb body near where the float was hanging ?..some of these come out easy ?..and some do not wanna budge !..sooo..this is your call..you can try to remove it ?..or leave it ?..i never bother with them..as most never wanna come out..they just strip out when trying to remove them !. ok..so far...so good..now..flip the carb right side up..with the top still off..and the slidder still out..with something small enough..and long enough..stick it down until it rest on the main jet's brass seat..DO NOT USE ANYTHING BIG HERE PPL !!..IF YOU DO ?..YOUR GONNA WEDGE THE SEAT..AND IT WILL NOT COME OUT !. ok..with what ever your using..lightly tap it down..it should fall out the bottom ????. unless you wedged it !!..lol. after it's out ?..on the outside of where the float bowl is..notice the pilot jet needle ?..seeing how your gonna replace all of it ?..we won't worry about the setting's for now..remove the pilot jet needle..when you take the needle out..you should have a spring..tiny washer..and then a tiny o-ring..most washers and o-rings always stays in the hole..you gotta dig them out !!!!..make sure you get them out !!..they are not easy..but it can be done !!..once they are out ?..you should have every part off the carb by now ??..take your gum out carb spray cleaner...and with the straw in it..spray every nook and cranny you see..all holes !!!!..PLEASE WEAR SAFETY GLASSES WHEN YOU DO THIS !!..IT BURNS LIKE YOU KNOW WHAT ! ( don't ask me how i know ! )..lol. spray the jets holes..choke enrichment hole..every part of the carb..top to bottom !. guessing you have a air compressor ?? ( you need to have one right now ! )..comming in behind that carb cleaner..blow out every hole..just like you did with the carb cleaner !!!. now..just start putting it all back together..when you get to the pilot jet ( air fuel mixture needle )...needle..spring..new tiny shinny washer..then new tiny o-ring..there also should be a o-ring that goes on the very screw end of the pilot needle ?..make sure you put the right one on it !!.hold the carb right side up.start the pilot needle..once you get it started..lightly..AND I MEAN LIGHTLY..seat the pilot needle all the way down..when you start to feal the needle get tight ?..DO NOT GO ANY FURTHER !!!..if you do ?..your gonna break the very tip of that needle off in the carb..AND YOU JUST RUINED YOUR CARB !..YOU WILL NEVER..EVER..GET THAT TIP OUT !. once that is done, back the screw out 2 1/2 turns..this is a pre-settings for now..new float bowl gasket on the bowl..remove the main jet from the main jet holder..install the new main jet into the holder..you may want to clean it with some carb spray before you install the jet ?. now slide the main jet seat into the main jet hole, make sure you face it the right way !!, it should have the beveled top side facing down into the hole ?!, now install the main jet. install the idle jet..it's the smaller shorter one..it goes done into the hole right next to the main jet holder. if you removed the very small jet ?..install the new one..now get the float..install the new float needle on it..line the float up..stick and tap the pin back through.DO NOT HIT IT HARD..YOU COULD BREAK OFF THE FLOAT HOLDER TABS ON THE SIDES !!. once the float is in..put your main jet's baffle back in ( if you were lucky enough to have one ? ) black rubber plug back in..hold the carb right side up..start your float bowl..it's easier to do it this way..because you wont loose your bowl gasket !!..once you get the float started...flip it upside down..and finish putting in the remaining screws..snug them..do not over tighten them !! carb right side up..install you slidder..plastic part and spring..then screw on the very top through the cam and throttle lever..spring needs to be in the middle of the pastic ?.and hooked onto the grooves on the ends of the metal arms ?..new gasket..top..3 screws. so far..so good !..now comes the final part..on the right hand side of the carb..where your throttle cable goes..remove the idle screw..your kit should have a new long spring ?..trash the old one after you get it off..new spring on..lay it to the side for now..see that seperate part..where there is a gap ?..and it should only make contact with the butter fly once it rasies so high..your trying to get these two parts to hit each other as close as you can..by doing this..you may need to spread ?..or close the tang gap ?..what happends is..when you use the thumb throttle..you raise the throttle cam..when that goes up so high..it makes contact with the slidder's tab on the top..then it raises the slidder..which..is your main jet..the trick here is..YOU HAVE TO GET THEM TO WORK IN TAMDEN !!!..if you do not ????..then your air to fuel mixture will not mix right !!. once you think you got them set right ?..from the open end of the carb..where the butter fly is...work the cam with your hand..as your doing this..watch the butter fly and the slidder at the same time..your trying to get both the butter fly...and the slidder to open..and the slidder to go up almost at the same time !!!..they really need to be as close as posb !!!!. once this is done ??.install the carb back in the atv..and it will run like a new bike !. if it does not ?..then you did not do something right !!!..lol.f i left anything out helmut ?..feal free too add to this !..lol.
__________________
'89 trx350D foreman 4x4...'85 vf700c magna, '83 cx650c , 1998 trx450s foreman 4x4

Last edited by shadetree; 08-25-2012 at 10:24 PM.
shadetree is offline   Reply With Quote
HondaATVForums.net is the premier Honda ATV Forum on the internet. Registered Users do not see these ads, so Register - It's Free!
Old 08-25-2012, 09:03 PM   #2 (permalink)
Junior Member
 
Leslie's Avatar
 
Member #21949
Join Date: Aug 2012
View Leslie's Photo Gallery(0)
Posts: 2
Shade tree, I read your post with interest and appreciate the time you have taken to give detailed directions on “how to over haul a TRX250 carb. Your description and instruction for “removing the throttle cable and the top side” must apply to some TRX 250 carburetors but does not apply to my 1998 PDC1BA carb installed on a 1998 TRX250 Recon. On the other hand, the general information is most helpful. The throttle cable and slide appear to be similar to some earlier model Honda cycles and were easy to remove. The main jet needle does have five grooves with the clip installed in the middle groove. However, the main jet needle in an Armore Tech over haul kit that was purchased from a Honda dealership is shorter than the old needle and has only three grooves. All the other parts in the kit appear to be compatible. It also appears to me that the clip installed in the top groove of the new needle would come close to the being the same length as the old needle with the clip in the middle groove. Is this assumption correct? Thank you for your help.
Leslie is offline   Reply With Quote
Old 08-25-2012, 10:23 PM   #3 (permalink)
Super Moderator
Supporting Member
 
shadetree's Avatar
 
Member #2048
Join Date: Feb 2010
Location: north little rock, ar.
View shadetree's Photo Gallery(0)
Posts: 18,749
Liked: 129 times
Quote:
Originally Posted by Leslie View Post
Shade tree, I read your post with interest and appreciate the time you have taken to give detailed directions on “how to over haul a TRX250 carb. Your description and instruction for “removing the throttle cable and the top side” must apply to some TRX 250 carburetors but does not apply to my 1998 PDC1BA carb installed on a 1998 TRX250 Recon. On the other hand, the general information is most helpful. The throttle cable and slide appear to be similar to some earlier model Honda cycles and were easy to remove. The main jet needle does have five grooves with the clip installed in the middle groove. However, the main jet needle in an Armore Tech over haul kit that was purchased from a Honda dealership is shorter than the old needle and has only three grooves. All the other parts in the kit appear to be compatible. It also appears to me that the clip installed in the top groove of the new needle would come close to the being the same length as the old needle with the clip in the middle groove. Is this assumption correct? Thank you for your help.
thanks...your correct on the carb over haul..that was meant for a old school trx250 utility..not any trx250 recons..as in the newer trx250's. i'll see if i can fix that !..lol.
__________________
'89 trx350D foreman 4x4...'85 vf700c magna, '83 cx650c , 1998 trx450s foreman 4x4
shadetree is offline   Reply With Quote
Old 09-15-2012, 01:51 PM   #4 (permalink)
Junior Member
 
ninfoboy69's Avatar
 
Member #23247
Join Date: Sep 2012
View ninfoboy69's Photo Gallery(0)
Posts: 5
I have a 87 trx250x and its getting way too much gas(it won't idle even whith the idle all the way in. It runs like crap. Idk how to get it to run leaner.is there a way to do this? I seen the main jet can be screwed out or in and then tightend down idk if I should screw it out or in or if its sutin to do with the needle. Please help I'm new to this and I can figuree out how to start my own thread lol
ninfoboy69 is offline   Reply With Quote
Old 09-16-2012, 07:01 PM   #5 (permalink)
Junior Member
 
GrtRat1's Avatar
 
Member #20737
Join Date: Jul 2012
View GrtRat1's Photo Gallery(0)
Posts: 8
I'm having the same problem as the poster above... If you look into the throat of the carburetor while it's running, you can see a lot of fuel coming up through the needle that's attached to the piston.
GrtRat1 is offline   Reply With Quote
Old 09-19-2012, 06:41 PM   #6 (permalink)
Super Moderator
Supporting Member
 
shadetree's Avatar
 
Member #2048
Join Date: Feb 2010
Location: north little rock, ar.
View shadetree's Photo Gallery(0)
Posts: 18,749
Liked: 129 times
Quote:
Originally Posted by GrtRat1 View Post
I'm having the same problem as the poster above... If you look into the throat of the carburetor while it's running, you can see a lot of fuel coming up through the needle that's attached to the piston.
i'll try to help if i can ?..i'm not much for sport quads ?..but they pretty much work the same way. first..remove the throat piston..then remove the main jet needle..on the needle is 5 grooves with a very tiny c-clip..if it's sitting in the middle groove ?..then this is stock setting..only time ppl move the clip up or down ?..is to richen the carb..or lean it ?..now..there is also another thing that happends as to why you move the c-clip !!..this is because where the tip or shall i say..the lower part of the main jet needle is ?..it goes up and down through the main jet needle seat..over time..this seat or the main jet needle..or both ??..wears out..and does not give the right amount of fuel to the engine as your working the throttle !!..soo..in this case..it depends on which part is doing what ??..if i were you ?..buy a carb rebuild kit..and over haul the carb..this the where you must start the process.
__________________
'89 trx350D foreman 4x4...'85 vf700c magna, '83 cx650c , 1998 trx450s foreman 4x4
shadetree is offline   Reply With Quote
Old 12-02-2012, 05:05 PM   #7 (permalink)
Member
 
gwhite's Avatar
 
Member #26645
Join Date: Dec 2012
View gwhite's Photo Gallery(0)
Posts: 60
Hi All,
I am rebuilding a TRX 250, as I got the carb all apart before soaking it I took the Piston throttle valve out.
Upon taking this out Inside is the two screws (rusty) that connects the valve to the valve arm. The valve in the bottom also has some rusty spots on it and this part does not come in the rebuild kit. Can I just clean this with a wire brush (possibly scraping some of the finish off) or should I just try and find a new one somewhere?
Upon reading in the forums I also noticed in one of my readings that someone on here had rebuilt carbs for 125.00 with shipping. I may take this route, there sure was alot of rusty looking gunk inside the carb. And I need to replace some of the small screws inside as well. In the Honda service manual it is on page 4-7 Thanks in advance for the help
and I am not sure if the pics came out.
Attached Thumbnails
how to over haul a trx250 carb ( utility ) !!.-carb-pics-039.jpg   how to over haul a trx250 carb ( utility ) !!.-carb-pics-040.jpg  

Last edited by gwhite; 12-02-2012 at 05:10 PM. Reason: add some pictures
gwhite is offline   Reply With Quote
Old 12-18-2012, 08:21 AM   #8 (permalink)
Super Moderator
Supporting Member
 
shadetree's Avatar
 
Member #2048
Join Date: Feb 2010
Location: north little rock, ar.
View shadetree's Photo Gallery(0)
Posts: 18,749
Liked: 129 times
Quote:
Originally Posted by gwhite View Post
Hi All,
I am rebuilding a TRX 250, as I got the carb all apart before soaking it I took the Piston throttle valve out.
Upon taking this out Inside is the two screws (rusty) that connects the valve to the valve arm. The valve in the bottom also has some rusty spots on it and this part does not come in the rebuild kit. Can I just clean this with a wire brush (possibly scraping some of the finish off) or should I just try and find a new one somewhere?
Upon reading in the forums I also noticed in one of my readings that someone on here had rebuilt carbs for 125.00 with shipping. I may take this route, there sure was alot of rusty looking gunk inside the carb. And I need to replace some of the small screws inside as well. In the Honda service manual it is on page 4-7 Thanks in advance for the help
and I am not sure if the pics came out.
nothing wrong with alittle rust on that arm bracket..just sand it down with some steel wool ?..or fine sand paper ?..either way will work..you can even spray paint it after if you want ?..rust get's in there from water in fuel ?..or someone ridding in water alot ?..lol. i did notice you left the arm and bracket together ?..they do not come out like that...not saying they can't ???.as we see now !..lol. but..the bracket stay's with the cylinder when you attach it back with those two tiny screws..then you drop it back down..then attach the arm and that plastic part and spring back on the bracket. make sure you check/replace the tiny c-clip back on the middle grove on the main jet needle before you screw the bracket back in !!..lol.
__________________
'89 trx350D foreman 4x4...'85 vf700c magna, '83 cx650c , 1998 trx450s foreman 4x4
shadetree is offline   Reply With Quote
Old 01-06-2013, 05:11 PM   #9 (permalink)
Junior Member
 
Richard09's Avatar
 
Member #27673
Join Date: Jan 2013
Location: Fort Worth, Texas
View Richard09's Photo Gallery(0)
Posts: 1
Hi,
I have had my 91 250x sitting in the shed for some while now. Its been Parked Since I broke my handle bars. I pulled it out today and put the gas tank back on it.(I Removed and Drained it for storage.) When i put gas in it the gas started running out of the carb air bent tube and the carb drain tube. Any thoughts on why this might be happening?
Richard09 is offline   Reply With Quote
Old 01-07-2013, 02:15 AM   #10 (permalink)
Super Moderator
Supporting Member
 
Deeperinthabush's Avatar
 
Member #8365
Join Date: Feb 2011
Location: Pensacola Fl.
View Deeperinthabush's Photo Gallery(0)
Posts: 11,010
Liked: 11 times
Welcome to da forums... The float needle dried out,and is stuck...try tapping on the carb body at the bowl using a large screwdriver handle a few good times,or remove the carb,and replace the float needle,and clean the carb thoroughly if the tapping doesn't fix it...
__________________
FREE REPAIR MANUALS >>http://www.hondaatvforums.net/forums...all-years.html 1986-1992 trx350 parts for sale>>http://www.hondaatvforums.net/forums/atv-parts-sale/29225-complete-part-out-1986-fourtrax-350-a.html
Deeperinthabush is offline   Reply With Quote
Reply

Lower Navigation
Go Back   Honda ATV Forum > Honda ATV Technical Discussions > Repair & Maintenance


Search tags for this page
1986 honda fourtrax 250 carburetor
,
98 honda recon carburetor
,

honda 250 carburetor

,
honda fourtrax 250 carb setting
,
honda recon trx 250 carburetor adjustment
,
honda trx 250 carb adjustment
,

honda trx 250 carburetor schematic

,
honda trx250te2 carburetor rebuild
,
how to adjust honda trx 250 carb
,

how to instal vavel cover on honda 250 recon 2007

,
trx 250 carburetor settings
,
u tube how to rebuild a carb pn a honda recon
Click on a term to search our sites for related topics.

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


» Discount Tire
Motosport.com


Powered by vBadvanced CMPS v3.2.1
All times are GMT -6. The time now is 06:13 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.