A forum for owners of Yamaha TTR250 trail and enduro bikes!

TT-R250M · TT-R250M

http://ttr250.com/Carb/TTR250_carburettor_strip_and_rebuild_guide.htm

TTRfan · TTRfan

The forum seems to replicate owners problems on my own bikes somehow This time the problem was a rounded out drain screw on a carb. I drilled out the damaged screw with a 3mm drill and then extracted it with a 3.5mm extractor. The new drain screw is part number 14T-14104-00 - available here Job done! B...

TTRfan · TTRfan

http://www.ttr250.com/Removing_carb/TTR_carb_removal.htm

petenz · petenz

had enough of the TTR carb leaking fuel... Time to put the 32mm flat slide on... the carb is 12mm shorter the the TTR carb so will make a 12mm thick block to go between the head & manifold that will move the carb/manifold back 12mm to get the inlet into the air boot... put a 42 pilot & 50 main jet in it...

barra8 · barra8

EDIT BY BRIAN - SEE http://www.ttr250.com/Floatpost/TTR_float_post_repair.htm FOR AN UPDATED REPAIR GUIDE!Since it seems to be a common problem to break the float pin support mount on the TTR carburetors i thought i would add this simple fix to the problem.Thanks for reading, Cheers. The ho...

pantheman · pantheman

Hi to all . I have a 93 Japan grey import in Greece (yes we are still alive and kickin) and I looking to restore my carb. I have found this page for anyone who is intersted. My problem is that they list models from 1999 to 2006. For all the parts they show total compatibility to all years models, EXCEPT the mai...

TTRfan · TTRfan

After breaking a couple of shafts (they are only made of brass) in the past trying to free a seized choke I decided to try a different approach today and it worked so I thought I would share it. I firstly took the top off the carb to see if there was any way of freeing it from inside but I don't believe there is...

TTRfan · TTRfan

I have tried my hand (Trish's actually!) at doing a couple of video tutorials to help owners removing and replacing their carb for the first time. I didn't really prepare properly so there is quite a bit of mumbling and senior "stuck for the words" moments so sorry about that! Here they are. In the first...

nwrider · nwrider

i am putting on new exhaust and with out taking out the carb to check if the pilot jet i need is a 52.5 is it long or short, and the 140 main i have seen in other post is small round. can someone help. its for a 2006 us 250. thanks

TTRfan · TTRfan

http://www.ttr250.com/Removing_carb/TTR_carb_removal.htm Also, there are a couple of tutorial videos showing removal and replacement of the carb here https://youtu.be/0k1EG1LuPBc and here https://youtu.be/Nlhl9aD9wHI

mossproof · mossproof

As there are a few 325s about, and the 350 kit is selling, I thought I should begin a thread about carb jetting for the big bore engines. Those of us who have been running the 325 for a while may have noticed they run a bit rich if the jetting is left standard. Sort of the opposite of what you might expect (coun...

yamaha42 · yamaha42

Hello all. I recently tore down my carb and cleaned it out because it had been sitting for a year and a half. I got it installed and put the bike back together, but when i turn on the pet****, gas comes out of both overflow lines. is it possible that i bent my floats?

Base · Base

Just thought I'd put a quick post in as there seems to be a few issues with this. My bike was having issues returning to a normal idle when coming to a stop. (It stayed high or took a while to return or needed a blip to return it to normal) I had previously rebuilt it with an 'All Balls' kit. After trying all...

rogpreston · rogpreston

Hi I am talking about an 04 blue tank model bike that I have had for 12yrs so it is not new to me. I am reasonably ok with practical stuff rebuilt engines etc . So my problem started when I came to take thebike out after a longish 1yr year of no activity. Starts up fine ticks over fine will rev up if throttle is op...

Robin · Robin

I am having problems starting the TTR 250. The bike has been ridden recently, fuel is about 2 months old.The bike starts but dies immediately, regardless of choke or throttle.I have cleaned the carb out a few times (pilot and main jets) and replaced the inlet stub, fuel flow is good.I still think this i...

mmwain · mmwain

It says "Removing the carb can be quite a big job if the air box is removed first.". Actually that's the easy way to do it. I think this should say "Removing the carb can be quite a tricky job if the air box has not been removed first and you don't know the technique, but it can be done without damage to the in...

Serj · Serj

I just purchased a 2002 TTR250 I took apart my carb for cleaning and I noticed when putting it back together that the check valve that sits in the bowl is missing. Before, the bike was running poorly. Im not sure if the valve fell out when I was cleaning it, or if I bought it that way. Could the poor running b...

Gabriel2fifD · Gabriel2fifD

I have rebuilt my carby with an all balls kit, a new original yamaha diaphragm and o rings for the fuel pump and a check seat valve I don't know if the check seat valve is new so is there meant to be a noticeable hole in the check valve because I can't see one, I can prime the throttle and use the choke and it wil...

Gabriel2fifD · Gabriel2fifD

I'm going to be using my first ultrasonic cleaner soon but I need some help on common cleaning solutions to use found around the house, its a 30L so it takes a lot of solution especially if I buy it pre mixed instead of a concentrated solution, I've been reading up what to use and the MSDS (manufacturer saf...

Gabriel2fifD · Gabriel2fifD

I am looking at buying a carby rebuild kit for my 1995 TTR250 carby but I cant find one, I have found kits for 1999 to 2012 carbies from All Balls they seem the same as far as the carby bowel gasket goes and the same for the top gasket where the slide is housed but for the rest of the kit I dont know if its compatib...

Paul Rennie · Paul Rennie

Competing in vintage enduro yesterday and engine revs suddenly rose to run at about half throttle. Cables all ok and throttle returning to throttle drop screw. Completed lap by turning out throttle stop screw, but then the bike kept stalling at critical moments. Had to DNF. Carb recent overhaul, ne...

TTRfan · TTRfan

Steve keeps most (if not all!) TTR carb parts in stock in the Totally TTRs online shop, including some second-hand jets, etc. - see here He also carries a wide range of used parts - see here If you are after parts that are not in the shop, contact Steve for availability and price. He is able to get nearly ev...

TTRfan · TTRfan

I have just come across one of these jets in my carb spares box! Anyone recognise it and know what it is please?It is stamped 147. Is it safe to assume it is a direct replacement for a standard 147 main jet? Brian

Rtw1day · Rtw1day

Bike runs well, except when at full throttle & I back off, the bike cuts out for a second & then surges on again… cheers!

Templet2 · Templet2

I have a 2008 ttr110.. bike has 102 hrs on it..motor is 100% stock. I had some carb issues with the stock carb so I purchased a mikuni vm26. Bike kicks off on first kick without having to use choke. I worked on the Jetting for 8 hours, New Plug ,New Gas (Non-Ethanol) tried a different Carb, Different Needl...

TTRfan · TTRfan

Long story short. Choke wouldn't work on a carb I am setting up. Everything else was fine once the bike started and warmed up but it was very reluctant to start. Took float bowl off and checked the choke and its galleries on the main body of the carb. All looked and worked as they should. It turned out that t...

MichaeltT · MichaeltT

Good morning all, Having purchased a TTR250 beginning of this month today was the first ride, now before i go any further all i have done is replaced the stock exhaust with a Totally TTR's Phoenix full exhaust system that from reading to description does not require any re-jetting so is designed to be...

Bran · Bran

Hi all, got my 1994 OE out of winter slumber & it has a sort of surge or uneven running at low/part throttle. Fresh fuel, well warmed up, pulls cleanly(ish) through rev range, ticks over fine. I've had this problem before & nver got to the bottom of it. Bike has snorkel mod, shorty header & ex...

Rtw1day · Rtw1day

Hi from Australia I just scored myself a GYTR exhaust & Am going to a rejet after installing & opening the airbox i pulled a carb apart planning on upping the jetting from 50 to 52.5 for the pilot, & from 137 to 140 but upon disassembl, I found the stock from new I believe, to have 50 pilot &a...

OkieRider · OkieRider

Hey all. New to the forum. I posted this over on Thumper Talk, and got no response, so I decided to make an account here. Its a 2005 US model. I got the bike last year. I did the basic stuff, took the baffle out of the pipe, rejetted, took the snorkel off of airbox, etc. That's when my problems started... ...

Topic		Started By	Replies	Views	Last Post
	STICKY: Rebuilding a TTR250 Teikei Y30P Carburettor (Preview) http://ttr250.com/Carb/TTR250_carburettor_strip_and_rebuild_guide.htm	TT-R250M	45	54474	Feb 23, 2026 by mossproof
	STICKY: Carburettor - replacing a damaged carb drain screw (Preview) The forum seems to replicate owners problems on my own bikes somehow This time the problem was a rounded out drain screw on a carb. I drilled out the damaged screw with a 3mm drill and then extracted it with a 3.5mm extractor. The new drain screw is part number 14T-14104-00 - available here Job done! B...	TTRfan	16	41752	Aug 24, 2023 by TTRfan
	STICKY: Carburettor - pictorial guide to stripping and checking a carb (Preview) http://www.ttr250.com/Removing_carb/TTR_carb_removal.htm	TTRfan	22	30009	Feb 16, 2023 by TTRfan
	STICKY: Alternative carbs for the TTR250 - 32mm carb ( 1 2 ) (Preview) had enough of the TTR carb leaking fuel... Time to put the 32mm flat slide on... the carb is 12mm shorter the the TTR carb so will make a 12mm thick block to go between the head & manifold that will move the carb/manifold back 12mm to get the inlet into the air boot... put a 42 pilot & 50 main jet in it...	petenz	64	86741	Apr 19, 2022 by Booki
	STICKY: Carburettor - repairing a broken carburetor - float pin post and choke (Preview) EDIT BY BRIAN - SEE http://www.ttr250.com/Floatpost/TTR_float_post_repair.htm FOR AN UPDATED REPAIR GUIDE!Since it seems to be a common problem to break the float pin support mount on the TTR carburetors i thought i would add this simple fix to the problem.Thanks for reading, Cheers. The ho...	barra8	13	40373	Jan 21, 2021 by CjJoyce
	STICKY: Carburettor - main nozzle differences ( 1 2 ) (Preview) Hi to all . I have a 93 Japan grey import in Greece (yes we are still alive and kickin) and I looking to restore my carb. I have found this page for anyone who is intersted. My problem is that they list models from 1999 to 2006. For all the parts they show total compatibility to all years models, EXCEPT the mai...	pantheman	56	82255	Jun 15, 2020 by dlee22
	STICKY: Freeing off a jammed choke (Preview) After breaking a couple of shafts (they are only made of brass) in the past trying to free a seized choke I decided to try a different approach today and it worked so I thought I would share it. I firstly took the top off the carb to see if there was any way of freeing it from inside but I don't believe there is...	TTRfan	6	7538	Feb 10, 2018 by katana
	STICKY: Removing and replacing the TTR250 carb video tutorials (Preview) I have tried my hand (Trish's actually!) at doing a couple of video tutorials to help owners removing and replacing their carb for the first time. I didn't really prepare properly so there is quite a bit of mumbling and senior "stuck for the words" moments so sorry about that! Here they are. In the first...	TTRfan	8	11759	Aug 8, 2017 by leigh
	STICKY: Carb - jetting information (Preview) i am putting on new exhaust and with out taking out the carb to check if the pilot jet i need is a 52.5 is it long or short, and the 140 main i have seen in other post is small round. can someone help. its for a 2006 us 250. thanks	nwrider	44	118682	Apr 18, 2017 by TTRfan
	STICKY: Carburettor removal and replacement (Preview) http://www.ttr250.com/Removing_carb/TTR_carb_removal.htm Also, there are a couple of tutorial videos showing removal and replacement of the carb here https://youtu.be/0k1EG1LuPBc and here https://youtu.be/Nlhl9aD9wHI	TTRfan	0	4763	Nov 13, 2013 by TTRfan
	The Big Bore Carb Jetting Thread - 325 and 350cc (Preview) As there are a few 325s about, and the 350 kit is selling, I thought I should begin a thread about carb jetting for the big bore engines. Those of us who have been running the 325 for a while may have noticed they run a bit rich if the jetting is left standard. Sort of the opposite of what you might expect (coun...	mossproof	37	4619	October 5th by IOWChris
	Carb issues ( 1 2 3 4 ) (Preview) Hello all. I recently tore down my carb and cleaned it out because it had been sitting for a year and a half. I got it installed and put the bike back together, but when i turn on the pet****, gas comes out of both overflow lines. is it possible that i bent my floats?	yamaha42	150	165984	September 16th by ttr steve
	Slow to return to idle - Carb issue (Preview) Just thought I'd put a quick post in as there seems to be a few issues with this. My bike was having issues returning to a normal idle when coming to a stop. (It stayed high or took a while to return or needed a blip to return it to normal) I had previously rebuilt it with an 'All Balls' kit. After trying all...	Base	2	237	September 4th by ttr steve
	Carb Problems (Preview) Hi I am talking about an 04 blue tank model bike that I have had for 12yrs so it is not new to me. I am reasonably ok with practical stuff rebuilt engines etc . So my problem started when I came to take thebike out after a longish 1yr year of no activity. Starts up fine ticks over fine will rev up if throttle is op...	rogpreston	17	2783	July 5th by Ttboof
	Starting issue (Preview) I am having problems starting the TTR 250. The bike has been ridden recently, fuel is about 2 months old.The bike starts but dies immediately, regardless of choke or throttle.I have cleaned the carb out a few times (pilot and main jets) and replaced the inlet stub, fuel flow is good.I still think this i...	Robin	7	723	Feb 27, 2026 by Ttboof
	Error in the TTR FAQ - removing the carb (Preview) It says "Removing the carb can be quite a big job if the air box is removed first.". Actually that's the easy way to do it. I think this should say "Removing the carb can be quite a tricky job if the air box has not been removed first and you don't know the technique, but it can be done without damage to the in...	mmwain	2	2966	Sep 1, 2025 by mossproof
	Missing check valve (Preview) I just purchased a 2002 TTR250 I took apart my carb for cleaning and I noticed when putting it back together that the check valve that sits in the bowl is missing. Before, the bike was running poorly. Im not sure if the valve fell out when I was cleaning it, or if I bought it that way. Could the poor running b...	Serj	1	1153	Aug 29, 2025 by mossproof
	Bike not starting could it be the check seat valve (Preview) I have rebuilt my carby with an all balls kit, a new original yamaha diaphragm and o rings for the fuel pump and a check seat valve I don't know if the check seat valve is new so is there meant to be a noticeable hole in the check valve because I can't see one, I can prime the throttle and use the choke and it wil...	Gabriel2fifD	1	1545	Jun 9, 2025 by Gabriel2fifD
	Cleaning a carburetor in an ultrasonic cleaner what household solution to use (Preview) I'm going to be using my first ultrasonic cleaner soon but I need some help on common cleaning solutions to use found around the house, its a 30L so it takes a lot of solution especially if I buy it pre mixed instead of a concentrated solution, I've been reading up what to use and the MSDS (manufacturer saf...	Gabriel2fifD	3	1798	May 31, 2025 by Gabriel2fifD
	Does the 1999-2012 All Balls carby rebuild kit fit a 1995 carby (Preview) I am looking at buying a carby rebuild kit for my 1995 TTR250 carby but I cant find one, I have found kits for 1999 to 2012 carbies from All Balls they seem the same as far as the carby bowel gasket goes and the same for the top gasket where the slide is housed but for the rest of the kit I dont know if its compatib...	Gabriel2fifD	1	1339	May 9, 2025 by TTRfan
	ENGINE SUDDENLY RUNNING TOO FAST - CARB AIR LEAK? (Preview) Competing in vintage enduro yesterday and engine revs suddenly rose to run at about half throttle. Cables all ok and throttle returning to throttle drop screw. Completed lap by turning out throttle stop screw, but then the bike kept stalling at critical moments. Had to DNF. Carb recent overhaul, ne...	Paul Rennie	2	1529	Mar 28, 2025 by Paul Rennie
	Carb repair and maintenance (Preview) Steve keeps most (if not all!) TTR carb parts in stock in the Totally TTRs online shop, including some second-hand jets, etc. - see here He also carries a wide range of used parts - see here If you are after parts that are not in the shop, contact Steve for availability and price. He is able to get nearly ev...	TTRfan	0	1711	Nov 8, 2024 by TTRfan
	Mystery main jet! (Preview) I have just come across one of these jets in my carb spares box! Anyone recognise it and know what it is please?It is stamped 147. Is it safe to assume it is a direct replacement for a standard 147 main jet? Brian	TTRfan	0	1614	Oct 30, 2024 by TTRfan
	Bike cutting out when backing off from full throttle (Preview) Bike runs well, except when at full throttle & I back off, the bike cuts out for a second & then surges on again… cheers!	Rtw1day	0	1668	Oct 16, 2024 by Rtw1day
	Need some guidance (Preview) I have a 2008 ttr110.. bike has 102 hrs on it..motor is 100% stock. I had some carb issues with the stock carb so I purchased a mikuni vm26. Bike kicks off on first kick without having to use choke. I worked on the Jetting for 8 hours, New Plug ,New Gas (Non-Ethanol) tried a different Carb, Different Needl...	Templet2	2	2163	Sep 5, 2024 by tripodtiger
	Choke not working - blockage in float bowl feed (Preview) Long story short. Choke wouldn't work on a carb I am setting up. Everything else was fine once the bike started and warmed up but it was very reluctant to start. Took float bowl off and checked the choke and its galleries on the main body of the carb. All looked and worked as they should. It turned out that t...	TTRfan	0	1597	Aug 21, 2024 by TTRfan
	Coughing and spluttering (Preview) Good morning all, Having purchased a TTR250 beginning of this month today was the first ride, now before i go any further all i have done is replaced the stock exhaust with a Totally TTR's Phoenix full exhaust system that from reading to description does not require any re-jetting so is designed to be...	MichaeltT	4	1932	Aug 1, 2024 by MichaeltT
	Surging at part throttle, air leak? (Preview) Hi all, got my 1994 OE out of winter slumber & it has a sort of surge or uneven running at low/part throttle. Fresh fuel, well warmed up, pulls cleanly(ish) through rev range, ticks over fine. I've had this problem before & nver got to the bottom of it. Bike has snorkel mod, shorty header & ex...	Bran	2	2232	Jun 19, 2024 by Ttboof
	Australian Model 147 main jet as stock??? (Preview) Hi from Australia I just scored myself a GYTR exhaust & Am going to a rejet after installing & opening the airbox i pulled a carb apart planning on upping the jetting from 50 to 52.5 for the pilot, & from 137 to 140 but upon disassembl, I found the stock from new I believe, to have 50 pilot &a...	Rtw1day	6	3038	Mar 22, 2024 by Rtw1day
	High or sticking idle?? ( 1 2 ) (Preview) Hey all. New to the forum. I posted this over on Thumper Talk, and got no response, so I decided to make an account here. Its a 2005 US model. I got the bike last year. I did the basic stuff, took the baffle out of the pipe, rejetted, took the snorkel off of airbox, etc. That's when my problems started... ...	OkieRider	56	11127	May 31, 2023 by mossproof
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