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

bbarfield · bbarfield

Hey Everyone, I know there is a ton of info (and confusion) about jetting, size variances between manufacturers, and what part numbers are available in OEM. I've been emailing back and forth with Jetsrus.com, and let them know the Mikuni jets they show on their website as appropriate for the TTR are a...

oshanrube · oshanrube

I'm not much of a mechanic but I can replace stuff, about 2 years ago I took this apart to restore and it kinda got stalled, and now I got a rebuilt kit and changed all the parts in the carb. But it's still running very rough,it smooths out for a sec but stalls right...

DelBoy · DelBoy

I've just completed a carb rebuild (with All Balls kit) but now have a leak from the diaphragm cover. I'm trying to avoid the expense of a new diaphragm so wondered if it also acts as a gasket, sealing against the cover? If it doesn't act as a gasket, then I assume replacing it isn't going to help. I've atta...

Booki · Booki

I will try and keep this a bit short... Bike: 2005 TTR250 - Aussie spec. Was doing some general cleaning on my Original carb that had done bugger all work from new (700km's) (it had a blocked pilot jet), ended up breaking the float tower off, had sourced a used carb. I believe this used carb is the 'older' s...

TTRtramp · TTRtramp

Ok guys, I have tried to avoid asking this question as the answer should be obvious, but despite a thorough search of the forum, I cannot find the specific answer although the general problem is referred to a lot. How does one actually remove the float bowl check valve seat and needle from the carby whe...

GzC59 · GzC59

Hi Folks, looks like my bike has developed a misfire on part throttle, the first part. Starts OK, always has and I’ve not had this before. I usually turn the fuel off and let the float bowl empty after a ride as the bike can stand for a while not being used. Not good, I know ! I had a look at the float bowl drain s...

wobbly · wobbly

Not exactly carb But what fuel are people using, is E10 OK in the long run.

650Katman · 650Katman

Hi, I ordered an all balls carb kit and a diaphragm for the accelerator pump from the marvellous Totally TTR's. My carb was dripping because some idiot( me ) put BP ultimate in it because the garage had just changed to E10 , So the rub is it was ultimate diesel So I stripped carb and replaced parts except f...

Bluebandit2g · Bluebandit2g

Need some help. Just got this bike on a trade. 03. Rebuilt the carb using all new parts with STOCK jetting sizes. Bike runs bad lean no matter what I do. Even with the airbox off. Black plug. Sooty pipe. Black smoke. I'm not a carb newb. Pulled it back off three times now to check things ...

BigGreener · BigGreener

New to me 2003 TTR250, the carb slide is sticking half way open periodically. After some reading I understand the coating on the side starts to fail, which is the likely cause of this? Does anyone know if I can just buy a new slide? If so, from where and what is the part number? Thanks, Ryan

TTRfan · TTRfan

Yeah - I know I should know but my brain isn't working this morning

The TTR Kid · The TTR Kid

Hello I am have a few problems with my TTR250. She's just reving high and because I haven't seen this carb before I'm confused.. basically when I got the bike running she was running high on revs and I couldn't found out how to adjust it to a nice pop pop pop. It's just reving above normal and getting hot qui...

Athenaacapella · Athenaacapella

Hi so I need help I bought this TTR 250 from my brother and the carb is shot. Does anyone know where I can purchase a new one? I have searched every where and I am not willing to pay $400 for a new one. Any help is appreciated.

Bob1973 · Bob1973

Hello could someone tell me what this little dial is at the bottom of my carb. It's on a thread and screws in and out. Located bottom left of carb in the photo. Thank you!

jball78 · jball78

Just purchased a 2004. Prev owner said bike has sat since 8/16. The bike will not start. After looking at the carb, one of the hoses is not connected. The hose on the left hand side is connected and the drain hose is also. However on the right side of the carbs hose is no where to be found. Any chance that is my...

Gooki · Gooki

Hi folks, bike runs perfect, but when it comes to idle, engine stops. Is ist the little wheel in front of the carb? Can i take it out and clean? Where is the idle jet? thanks!

Base · Base

Its probably already been mentioned somewhere on here, but after purchasing the All Balls Carby rebuild kit, have to say i was pretty disappointed with it. Hadn't had the carb off since i got it. Theory being if it ain't broke, dont fix it. Was getting some minor over reving when coming to idle, so I th...

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...

TTRfan · TTRfan

I have been in email conversation with Peter Gray of Wilderness Wheels Morocco. They run a small fleet of blue TTRs alongside their KTM 450 EXCs. Peter says they find the TTR to be a totally competent off road bike in Morocco and is his preference over the KTMs for a ride over the mountains. He has rece...

Don · Don

HI I have just rebuilt my carb and fitted a new diaphragm . when i operate the throttle arm there is no jet of fuel coming out. the small jet was blocked. but it seem to be clear now. the diaphragm seems to be pumping ok but no fuel comes out, could it be the check vale, is there any way to test them. any help much...

Sammyboy · Sammyboy

I'm currently rebuilding the carb on my ttr 250 and trying to isolate the revving and idle problem, how do I go about removing the float?

tsherv · tsherv

I have a 2006 TTR 250 that sat for a few years. After it was taken out of storage, the carb was soaked and rebuilt (All balls kit), fuel lines replaced, inline fuel filter replaced, etc. The pilot jet continually plugs up. I've had the carb off countless times (I've actually gotten pretty good at it)....

Forgorin · Forgorin

Like the title says. The bike has power after 80km. I had the carb apart and she was clean. jets look clean too. It was like this when it was purchased used.... Any ideas?

Sammyboy · Sammyboy

Has anyone done a carb swap or is the stock carb good? For context I want to build my ttr for aggressive riding and xc races.

TTRfan · TTRfan

I have had some cold starting problems on my 325 whereby it starts but quickly dies. I raised the pilot jet size up from 48 to 50 and it seemed to make an improvement but I haven't run the TTR often enough to test it thoroughly. I came across this video this morning and, even though the guy is dealing with a TT...

PetahNZ · PetahNZ

Hi, So I am a bit of a mechanical newbie (first post here too). I have a TTR250, but it stopped running. So I decided to try and clean out the carb as the first thing I've ever done to a bike (or even a car). Seemed to go alright, but after putting it all back together it has started leaking petrol out of the brea...

dlee22 · dlee22

https://www.ebay.ie/itm/Yamaha-TTR250-TT-R-250R-TTR-250-cc-R250-Raid-Carburetor-Carb-Stage-1-3-Jet-Kit-/332032207413

Dave White · Dave White

Bough a 2003 TTR250, whoever tried to service carb before me stripped and pinched off (with pliers) the accelerator pump nozzle jet. You cant buy this part and it doesn't show on the exploded ipc diagram. Anyone have a fix or a carb they don't need?

Dan-in-a-Van · Dan-in-a-Van

I rode the TTR to work today and she ran perfectly. I left her parked in the rain for 8 hours. When I started her up to come home, she just didn't want to run. I managed to limp about 1/4 mile, sometimes running fine, then bogging and stalling. Next only running with the choke full out before stalling again?...

DECYPHERX · DECYPHERX

So i just bought myself a 1999 ttr250 and everything works amazing, however the idle is high. I can fix this by giving it throttle real quick and letting off and then the idle goes down to normal. The cable doesnt seem to be sticking. Not entirely sure whats going on here. Theres a post on this forum that de...

Topic		Started By	Replies	Views	Last Post
	Great Update Regarding Jets (Preview) Hey Everyone, I know there is a ton of info (and confusion) about jetting, size variances between manufacturers, and what part numbers are available in OEM. I've been emailing back and forth with Jetsrus.com, and let them know the Mikuni jets they show on their website as appropriate for the TTR are a...	bbarfield	3	1980	Jul 9, 2022 by ttr steve
	Bike stalling and running rough (Preview) I'm not much of a mechanic but I can replace stuff, about 2 years ago I took this apart to restore and it kinda got stalled, and now I got a rebuilt kit and changed all the parts in the carb. But it's still running very rough,it smooths out for a sec but stalls right...	oshanrube	5	1429	May 29, 2022 by texasT
	Leaky diaphragm cover (Preview) I've just completed a carb rebuild (with All Balls kit) but now have a leak from the diaphragm cover. I'm trying to avoid the expense of a new diaphragm so wondered if it also acts as a gasket, sealing against the cover? If it doesn't act as a gasket, then I assume replacing it isn't going to help. I've atta...	DelBoy	5	1285	May 26, 2022 by TTRtramp
	Choke not working correctly and bike stalling out after throttle (Preview) I will try and keep this a bit short... Bike: 2005 TTR250 - Aussie spec. Was doing some general cleaning on my Original carb that had done bugger all work from new (700km's) (it had a blocked pilot jet), ended up breaking the float tower off, had sourced a used carb. I believe this used carb is the 'older' s...	Booki	1	1381	Apr 28, 2022 by ttr steve
	Float bowl check valve (Preview) Ok guys, I have tried to avoid asking this question as the answer should be obvious, but despite a thorough search of the forum, I cannot find the specific answer although the general problem is referred to a lot. How does one actually remove the float bowl check valve seat and needle from the carby whe...	TTRtramp	10	1872	Apr 5, 2022 by TTRtramp
	Part Throttle Misfire (Preview) Hi Folks, looks like my bike has developed a misfire on part throttle, the first part. Starts OK, always has and I’ve not had this before. I usually turn the fuel off and let the float bowl empty after a ride as the bike can stand for a while not being used. Not good, I know ! I had a look at the float bowl drain s...	GzC59	13	1740	Jan 12, 2022 by GzC59
	Fuel (Preview) Not exactly carb But what fuel are people using, is E10 OK in the long run.	wobbly	7	1380	Nov 29, 2021 by KiwiJeff
	150 main jet (Preview) Hi, I ordered an all balls carb kit and a diaphragm for the accelerator pump from the marvellous Totally TTR's. My carb was dripping because some idiot( me ) put BP ultimate in it because the garage had just changed to E10 , So the rub is it was ultimate diesel So I stripped carb and replaced parts except f...	650Katman	1	1140	Oct 11, 2021 by mossproof
	Running rich no matter what. Stock jetting help please. Stumped (Preview) Need some help. Just got this bike on a trade. 03. Rebuilt the carb using all new parts with STOCK jetting sizes. Bike runs bad lean no matter what I do. Even with the airbox off. Black plug. Sooty pipe. Black smoke. I'm not a carb newb. Pulled it back off three times now to check things ...	Bluebandit2g	19	2601	Aug 10, 2021 by Jeff B
	Where to buy carb slide? (Preview) New to me 2003 TTR250, the carb slide is sticking half way open periodically. After some reading I understand the coating on the side starts to fail, which is the likely cause of this? Does anyone know if I can just buy a new slide? If so, from where and what is the part number? Thanks, Ryan	BigGreener	2	1074	Aug 1, 2021 by BigGreener
	Sanity check! Does screwing out the pilot screw richen or lean the mixture please?? (Preview) Yeah - I know I should know but my brain isn't working this morning	TTRfan	15	7365	Jul 27, 2021 by Jeff B
	carb ???? (Preview) Hello I am have a few problems with my TTR250. She's just reving high and because I haven't seen this carb before I'm confused.. basically when I got the bike running she was running high on revs and I couldn't found out how to adjust it to a nice pop pop pop. It's just reving above normal and getting hot qui...	The TTR Kid	6	1180	May 29, 2021 by ttboof
	Where can I find a new 2005 carburetor? (Preview) Hi so I need help I bought this TTR 250 from my brother and the carb is shot. Does anyone know where I can purchase a new one? I have searched every where and I am not willing to pay $400 for a new one. Any help is appreciated.	Athenaacapella	5	1431	May 24, 2021 by Jeff B
	hello what is this screw (Preview) Hello could someone tell me what this little dial is at the bottom of my carb. It's on a thread and screws in and out. Located bottom left of carb in the photo. Thank you!	Bob1973	1	1088	May 15, 2021 by TTRfan
	Carb drain/breather hose routing (Preview) Just purchased a 2004. Prev owner said bike has sat since 8/16. The bike will not start. After looking at the carb, one of the hoses is not connected. The hose on the left hand side is connected and the drain hose is also. However on the right side of the carbs hose is no where to be found. Any chance that is my...	jball78	12	11969	Apr 11, 2021 by TTRfan
	No Idle (Preview) Hi folks, bike runs perfect, but when it comes to idle, engine stops. Is ist the little wheel in front of the carb? Can i take it out and clean? Where is the idle jet? thanks!	Gooki	1	914	Mar 3, 2021 by TTRfan
	All Balls Carby repair kit (Preview) Its probably already been mentioned somewhere on here, but after purchasing the All Balls Carby rebuild kit, have to say i was pretty disappointed with it. Hadn't had the carb off since i got it. Theory being if it ain't broke, dont fix it. Was getting some minor over reving when coming to idle, so I th...	Base	9	1880	Jan 14, 2021 by CjJoyce
	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	33	3184	Dec 7, 2020 by 325 ttr
	Fitting a Mikuni TM32 and a TM33 ( 1 2 ) (Preview) I have been in email conversation with Peter Gray of Wilderness Wheels Morocco. They run a small fleet of blue TTRs alongside their KTM 450 EXCs. Peter says they find the TTR to be a totally competent off road bike in Morocco and is his preference over the KTMs for a ride over the mountains. He has rece...	TTRfan	68	48452	Oct 29, 2020 by TTRfan
	Carb Problem (Preview) HI I have just rebuilt my carb and fitted a new diaphragm . when i operate the throttle arm there is no jet of fuel coming out. the small jet was blocked. but it seem to be clear now. the diaphragm seems to be pumping ok but no fuel comes out, could it be the check vale, is there any way to test them. any help much...	Don	3	1167	Jul 5, 2020 by ttr steve
	Removing the float (Preview) I'm currently rebuilding the carb on my ttr 250 and trying to isolate the revving and idle problem, how do I go about removing the float?	Sammyboy	1	1273	Jul 4, 2020 by ttr steve
	Recurring pilot jet plugged (Preview) I have a 2006 TTR 250 that sat for a few years. After it was taken out of storage, the carb was soaked and rebuilt (All balls kit), fuel lines replaced, inline fuel filter replaced, etc. The pilot jet continually plugs up. I've had the carb off countless times (I've actually gotten pretty good at it)....	tsherv	2	1076	May 18, 2020 by PlumasDude
	no power over 80km/h (Preview) Like the title says. The bike has power after 80km. I had the carb apart and she was clean. jets look clean too. It was like this when it was purchased used.... Any ideas?	Forgorin	12	1429	Apr 1, 2020 by Forgorin
	Carb swap? (Preview) Has anyone done a carb swap or is the stock carb good? For context I want to build my ttr for aggressive riding and xc races.	Sammyboy	1	1439	Mar 30, 2020 by TTRfan
	Cold starting problem (Preview) I have had some cold starting problems on my 325 whereby it starts but quickly dies. I raised the pilot jet size up from 48 to 50 and it seemed to make an improvement but I haven't run the TTR often enough to test it thoroughly. I came across this video this morning and, even though the guy is dealing with a TT...	TTRfan	3	1891	Feb 22, 2020 by TTRfan
	Petrol leak (Preview) Hi, So I am a bit of a mechanical newbie (first post here too). I have a TTR250, but it stopped running. So I decided to try and clean out the carb as the first thing I've ever done to a bike (or even a car). Seemed to go alright, but after putting it all back together it has started leaking petrol out of the brea...	PetahNZ	11	1279	Feb 5, 2020 by Jeff B
	Has anyone tried a jetting kit? (Preview) https://www.ebay.ie/itm/Yamaha-TTR250-TT-R-250R-TTR-250-cc-R250-Raid-Carburetor-Carb-Stage-1-3-Jet-Kit-/332032207413	dlee22	19	2472	Jan 22, 2020 by Spyrious
	Accelerator pump nozzle (Preview) Bough a 2003 TTR250, whoever tried to service carb before me stripped and pinched off (with pliers) the accelerator pump nozzle jet. You cant buy this part and it doesn't show on the exploded ipc diagram. Anyone have a fix or a carb they don't need?	Dave White	6	1707	Jan 20, 2020 by Dave White
	Rain stops play? (Preview) I rode the TTR to work today and she ran perfectly. I left her parked in the rain for 8 hours. When I started her up to come home, she just didn't want to run. I managed to limp about 1/4 mile, sometimes running fine, then bogging and stalling. Next only running with the choke full out before stalling again?...	Dan-in-a-Van	5	1448	Jan 17, 2020 by Dan-in-a-Van
	Throttle sticking HELP (Preview) So i just bought myself a 1999 ttr250 and everything works amazing, however the idle is high. I can fix this by giving it throttle real quick and letting off and then the idle goes down to normal. The cable doesnt seem to be sticking. Not entirely sure whats going on here. Theres a post on this forum that de...	DECYPHERX	27	4873	Dec 31, 2019 by ttboof
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