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

Trask · Trask

Put a Koso 32mm on runs and idles good but bogs out completely from 0-25 % Throttle. I don't know what to do.

Trask · Trask

Wondering if anyone has some experience on replacing the stock Carb in a 2005. Someone broke the inside wall of the Carb probably dropped it and tried repairing it, with ghetto procedures. Now it has a bad bog mid throttle. Just looking for good replacements instead of buying another stock one for $40...

marcusp · marcusp

Hello I have just got myself a 52.5 Mikuni pilot jet and I have noticed the pilot jet is a lot longer than the original jet I was wondering if anyone would recommend taking the white fuel splash shield that goes around the main jet off. To me it looks like it may affect the flow to the pilot jet and if i wa...

stewy2603 · stewy2603

Hi all, I have the white tank TTR250 Open Enduro, I believe 1994ish. Since I've bought it, it has an annoyingly fast idle speed with the choke on. I have the manual but I cannot see a section which describes how to adjust it. Any help would be appreciated! For reference: I tried turning it in, but it doesn'...

TTRfan · TTRfan

I had put a spare tank on my 325 to use whilst I put a new set of decals on the original. The tank had a new fuel tap on so I didn't bother to take it out for inspection. I actually got around to stickering up the original tank today so decided to drain the spare tank of fuel before taking it off. It seemed odd that...

TTRVN · TTRVN

I have been playing with jets on my 1996 Raid lately. My bike has the snorkel out, no restrictor. Before it ran fine, but the first 1/4 was weak so I changed the #50 pilot to a 52.5. The new power was instantly noticeable. However, beyond about 1/4 -1/3 it weakens for a bit, then picks up again. Every singl...

Shed71 · Shed71

Hi there. Just recently got myself a ttr and it rums a fcr33. I have just took it off to clean it out as it overflows if the engine is switched off and fuel is on. Does anyone else have experience of these carbs? If so what jets do you use and have you any advice?

mossproof · mossproof

Been fiddling around with the jetting on my 325 recently as I've got the loan of an Air/fuel ratio meter and header pipe with lambda sensor boss. (Oh, and I've got no wife/kids/life ) The 325 runs nicely on 50 pilot/147main jets, needle clip 1 notch above middle. Motad exhaust, Twinair filter and mild...

Paul C · Paul C

I was given an 04 TTR by a good friend. It hasn't run for a few years. I started it a few weeks ago and it kept cutting out. Because of the long lay off I suspected carb issues. I have removed, stripped and cleaned the carb but used no new o rings etc. I'm pretty sure somebody with a heavy wrist has had a go at the c...

TTR250RIDER · TTR250RIDER

I want to go up jet sizes on my 1999 ttr250. Wanting to know of any good jet brands and what size to use for the teikei y30p carb. Any help is appreciated thanks. I am planning on getting an fmf powercore 4 And a k&n air filter also -- Edited by TTR250RIDER on Monday 30th of May 2016 05:30:19 AM

Alf c h · Alf c h

Have this problem on my 2001 model. Bike not run for 6weeks. After 1/2 hr to the first trail uphill then on tarmac for about a mile then all of a sudden miss-fire cruising about 1/2 throttle. Instant thought fuel, so switched to reserve:- Symptom remains? Bike has been running perfect since new. Fitted...

nelly · nelly

hi guys whilst the ttr is currently balancing on the stand with no forks I thought id get a few things done, new rear tyre ,better clearance now with 13t up front,new front tyre fitted too sort of re-routed the clutch cable to give an inch more length,high bars made it very very slightly pull on full lock,...

irishttr250 · irishttr250

hi i bought a 2000 ttr 250 which someone had been at the carb settings,does anyone know the correct settings any help would be great

Tommy the cat · Tommy the cat

Ok just went out for a blat and bike died on me... basically it will tick over but dies if I rev it....she won't even pull off. I had a problem with her a few weeks ago that when I reved her I had a flat spot when I grabbed a fist full but I thought maybe previos owner had old fuel in it.... Any way I'm guessing crap...

locky · locky

Wonder how well a xt250 carb would fit ? The cables look like they would be a straight fit and it's a pumper carb like the original. The Teikei carb seems to be getting very rare so could this be a good replacement ? Being Mikuni spares would be available and iv'e seen service kits on ebay. Think i'd give one...

Mikeycathlab · Mikeycathlab

bike would not start so took out plug,black and sooty. removed carb to service and follow excellent Sticky removed bowl to find this looks like an interesting weekend following another Sticky on how to repair the post off to look round the Theatres at work to see if I can find a suitable peice of metal to...

Keith89 · Keith89

okay so I have a keihin 38mm carb off a yz250f mounting it isn't a problem it's more can I use this carb without plugging in the tps sensor????

aussiedeuce · aussiedeuce

Is there a part number for a carby repair /rebuild kit?

srad34 · srad34

Evening all, Just taken my '94 TTR for a quick test run and its bogging under load, revs clean at standstill, good spark etc. The plug was black and the air filter clean. Not had chance to take the carb off as yet, but it was supplied with a competition exhaust that was taken off recently as its loud and a sta...

JOHNYBOY · JOHNYBOY

anyone got a float bowl my drain screw siezed in tried drill easyout etc no good

JOHNYBOY · JOHNYBOY

anyone got a exploded diagram of a carb & the std settings what to look for etc many thanks

jpv7774 · jpv7774

Hello all....just bought 2005 TTR250....I thought it was in good shape but have already found a couple of issues. At idle the engine pops and coughs backwards in direction of carb.....not noticeable while riding. Previous owner noted the bike had sat for a while so he had an auto mechanic friend cl...

ttr_paul · ttr_paul

My bike is running rich, as it splutters a lot on WOT. I have ran it with air box lid removed and it runs a lot better. Main jet is a 147, can anyone recommend what size main jet to change to? exhaust is a CRD open pipe. Is there a point changing pilot jet as it runs ok on low revs. Many thanks.

KamJam · KamJam

Hey! I was wondering if anyone knew what jets (pilot and main) would work most efficient at 7000ft above sea level. I dropped the needle down two notches in the carb but it still sputters at high rpm and i can not get full power. Let me know your guys opinion!!

TTRHead · TTRHead

I noticed that I had a little petrol come out of this hole When I turned the fuel on. I had only just cleaned the carb it stopped after a few secs and hasn't done it since. as you sit on the bike this hole is on the right hand side of the carb on the bottom of the float bowl. I think it's for a pipe I didn't see a pipe o...

jasparach · jasparach

Does anyone know of a good carburettor reconditioning company in the uk, has anyone used a specific company to carry out any work? I am thinking of getting mine reconditioned if it's possible. Cheers John

shikufra · shikufra

Fairly New to riding every day but have to choke every morning for the bike to start. Any ideas or should i get used to this? tried changing plug but not sure the replacement was any better than the one that was in(hard to get genuine spares).

Aron · Aron

Hello, I'm just learning how to take apart my carb on my TTR, as I cleaned the jets after it sat all winter. When I put it all back together and turned on the pet**** to fill the bowl, it started leaking out of the overflow. I figured the float was stuck so I tapped on it and it stopped leaking. Then when I st...

locky · locky

As above, my TTR starts and idles very well, i can even get it to idle very slowly and it ticks over lovely. But just above idle it seems slightly hesitant, this will be a pain when riding off road. Other than this it revs cleanly through the rev range as it should. Iv'e put the standard exhaust back on incas...

TTRfan · TTRfan

See here I found this when tidying up my file system. Very interesting. Any comments? Brian

Topic		Started By	Replies	Views	Last Post
	New Carb (Preview) Put a Koso 32mm on runs and idles good but bogs out completely from 0-25 % Throttle. I don't know what to do.	Trask	5	1041	Nov 7, 2016 by Trask
	Carb Replacements! Carb 2005 (Preview) Wondering if anyone has some experience on replacing the stock Carb in a 2005. Someone broke the inside wall of the Carb probably dropped it and tried repairing it, with ghetto procedures. Now it has a bad bog mid throttle. Just looking for good replacements instead of buying another stock one for $40...	Trask	6	2314	Oct 11, 2016 by petenz
	carby pilot jet help please (Preview) Hello I have just got myself a 52.5 Mikuni pilot jet and I have noticed the pilot jet is a lot longer than the original jet I was wondering if anyone would recommend taking the white fuel splash shield that goes around the main jet off. To me it looks like it may affect the flow to the pilot jet and if i wa...	marcusp	2	851	Oct 2, 2016 by marcusp
	Fast Idle Speed Adjustment (ie Choke) (Preview) Hi all, I have the white tank TTR250 Open Enduro, I believe 1994ish. Since I've bought it, it has an annoyingly fast idle speed with the choke on. I have the manual but I cannot see a section which describes how to adjust it. Any help would be appreciated! For reference: I tried turning it in, but it doesn'...	stewy2603	3	583	Aug 19, 2016 by stewy2603
	The effect of storing a tank with fuel in (Preview) I had put a spare tank on my 325 to use whilst I put a new set of decals on the original. The tank had a new fuel tap on so I didn't bother to take it out for inspection. I actually got around to stickering up the original tank today so decided to drain the spare tank of fuel before taking it off. It seemed odd that...	TTRfan	9	1646	Aug 13, 2016 by fourelms
	Jetting help with 1996 Raid (Preview) I have been playing with jets on my 1996 Raid lately. My bike has the snorkel out, no restrictor. Before it ran fine, but the first 1/4 was weak so I changed the #50 pilot to a 52.5. The new power was instantly noticeable. However, beyond about 1/4 -1/3 it weakens for a bit, then picks up again. Every singl...	TTRVN	0	570	Jul 23, 2016 by TTRVN
	Keihin fcr 33 ...any body use one? (Preview) Hi there. Just recently got myself a ttr and it rums a fcr33. I have just took it off to clean it out as it overflows if the engine is switched off and fuel is on. Does anyone else have experience of these carbs? If so what jets do you use and have you any advice?	Shed71	3	1526	Jul 19, 2016 by honda15i
	Some observations on jetting (Preview) Been fiddling around with the jetting on my 325 recently as I've got the loan of an Air/fuel ratio meter and header pipe with lambda sensor boss. (Oh, and I've got no wife/kids/life ) The 325 runs nicely on 50 pilot/147main jets, needle clip 1 notch above middle. Motad exhaust, Twinair filter and mild...	mossproof	7	764	Jul 9, 2016 by TTRfan
	wont idle without some choke (Preview) I was given an 04 TTR by a good friend. It hasn't run for a few years. I started it a few weeks ago and it kept cutting out. Because of the long lay off I suspected carb issues. I have removed, stripped and cleaned the carb but used no new o rings etc. I'm pretty sure somebody with a heavy wrist has had a go at the c...	Paul C	23	4369	Jun 5, 2016 by masterbill
	Anybody Know of Aftermarket Jetting (Preview) I want to go up jet sizes on my 1999 ttr250. Wanting to know of any good jet brands and what size to use for the teikei y30p carb. Any help is appreciated thanks. I am planning on getting an fmf powercore 4 And a k&n air filter also -- Edited by TTR250RIDER on Monday 30th of May 2016 05:30:19 AM	TTR250RIDER	2	759	May 31, 2016 by locky
	Misfire cruising at 1/2 throttle and higher (Preview) Have this problem on my 2001 model. Bike not run for 6weeks. After 1/2 hr to the first trail uphill then on tarmac for about a mile then all of a sudden miss-fire cruising about 1/2 throttle. Instant thought fuel, so switched to reserve:- Symptom remains? Bike has been running perfect since new. Fitted...	Alf c h	9	2011	May 25, 2016 by Alf c h
	pilot ?? (Preview) hi guys whilst the ttr is currently balancing on the stand with no forks I thought id get a few things done, new rear tyre ,better clearance now with 13t up front,new front tyre fitted too sort of re-routed the clutch cable to give an inch more length,high bars made it very very slightly pull on full lock,...	nelly	26	1242	Apr 26, 2016 by nelly
	carb settings (Preview) hi i bought a 2000 ttr 250 which someone had been at the carb settings,does anyone know the correct settings any help would be great	irishttr250	2	815	Mar 13, 2016 by TTRfan
	Won't run at revs.. (Preview) Ok just went out for a blat and bike died on me... basically it will tick over but dies if I rev it....she won't even pull off. I had a problem with her a few weeks ago that when I reved her I had a flat spot when I grabbed a fist full but I thought maybe previos owner had old fuel in it.... Any way I'm guessing crap...	Tommy the cat	30	1738	Feb 16, 2016 by TTRfan
	Possible carb replacement ? (Preview) Wonder how well a xt250 carb would fit ? The cables look like they would be a straight fit and it's a pumper carb like the original. The Teikei carb seems to be getting very rare so could this be a good replacement ? Being Mikuni spares would be available and iv'e seen service kits on ebay. Think i'd give one...	locky	21	6957	Feb 1, 2016 by Minty
	Carb problem (Preview) bike would not start so took out plug,black and sooty. removed carb to service and follow excellent Sticky removed bowl to find this looks like an interesting weekend following another Sticky on how to repair the post off to look round the Theatres at work to see if I can find a suitable peice of metal to...	Mikeycathlab	3	669	Jan 29, 2016 by TTRfan
	Carb upgrade question (Preview) okay so I have a keihin 38mm carb off a yz250f mounting it isn't a problem it's more can I use this carb without plugging in the tps sensor????	Keith89	0	552	Dec 24, 2015 by Keith89
	REBUILD KIT PART NO? (Preview) Is there a part number for a carby repair /rebuild kit?	aussiedeuce	12	916	Dec 21, 2015 by aussiedeuce
	Newbie to my TTR, bogging down under load (Preview) Evening all, Just taken my '94 TTR for a quick test run and its bogging under load, revs clean at standstill, good spark etc. The plug was black and the air filter clean. Not had chance to take the carb off as yet, but it was supplied with a competition exhaust that was taken off recently as its loud and a sta...	srad34	4	1021	Sep 29, 2015 by srad34
	float bowl (Preview) anyone got a float bowl my drain screw siezed in tried drill easyout etc no good	JOHNYBOY	6	758	Sep 26, 2015 by TTRfan
	stripping cleaning carb (Preview) anyone got a exploded diagram of a carb & the std settings what to look for etc many thanks	JOHNYBOY	1	761	Sep 24, 2015 by Cubber
	NEWBIE NEEDS HELP WITH CARB MODS.... (Preview) Hello all....just bought 2005 TTR250....I thought it was in good shape but have already found a couple of issues. At idle the engine pops and coughs backwards in direction of carb.....not noticeable while riding. Previous owner noted the bike had sat for a while so he had an auto mechanic friend cl...	jpv7774	9	1250	Sep 10, 2015 by jpv7774
	Jetting reccomendations, running rich (Preview) My bike is running rich, as it splutters a lot on WOT. I have ran it with air box lid removed and it runs a lot better. Main jet is a 147, can anyone recommend what size main jet to change to? exhaust is a CRD open pipe. Is there a point changing pilot jet as it runs ok on low revs. Many thanks.	ttr_paul	17	1460	Sep 5, 2015 by ttr_paul
	Jets For High Elevation (Preview) Hey! I was wondering if anyone knew what jets (pilot and main) would work most efficient at 7000ft above sea level. I dropped the needle down two notches in the carb but it still sputters at high rpm and i can not get full power. Let me know your guys opinion!!	KamJam	9	3791	Aug 12, 2015 by PlumasDude
	Carb pipe hole (Preview) I noticed that I had a little petrol come out of this hole When I turned the fuel on. I had only just cleaned the carb it stopped after a few secs and hasn't done it since. as you sit on the bike this hole is on the right hand side of the carb on the bottom of the float bowl. I think it's for a pipe I didn't see a pipe o...	TTRHead	21	1183	Jun 26, 2015 by TTRfan
	Carb reconditioning (Preview) Does anyone know of a good carburettor reconditioning company in the uk, has anyone used a specific company to carry out any work? I am thinking of getting mine reconditioned if it's possible. Cheers John	jasparach	0	545	Jun 22, 2015 by jasparach
	Choke to Start engine only starts when chocked choke start (Preview) Fairly New to riding every day but have to choke every morning for the bike to start. Any ideas or should i get used to this? tried changing plug but not sure the replacement was any better than the one that was in(hard to get genuine spares).	shikufra	2	441	Jun 10, 2015 by locky
	Revving up (Preview) Hello, I'm just learning how to take apart my carb on my TTR, as I cleaned the jets after it sat all winter. When I put it all back together and turned on the pet**** to fill the bowl, it started leaking out of the overflow. I figured the float was stuck so I tapped on it and it stopped leaking. Then when I st...	Aron	3	551	May 20, 2015 by TTRfan
	Hesitant just above idle. (Preview) As above, my TTR starts and idles very well, i can even get it to idle very slowly and it ticks over lovely. But just above idle it seems slightly hesitant, this will be a pain when riding off road. Other than this it revs cleanly through the rev range as it should. Iv'e put the standard exhaust back on incas...	locky	41	1702	Apr 25, 2015 by locky
	Suggested "carb fix" (Preview) See here I found this when tidying up my file system. Very interesting. Any comments? Brian	TTRfan	1	761	Apr 3, 2015 by TTRfan
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