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

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

widge · widge

does it stick out by about 20mm or does it sit back flush with the carb?

DC · DC

The bike was standing for 18-months with fuel in, carb not drained. It would crank over but not run. So far I have done the following.. - Emptied old fuel in tank, filled up with a couple of litres of new fuel - Carb removed. Took apart from the float side only. Cleaned jets, diaphragm, bowl and float, an...

dannydandan · dannydandan

looking too adjust my needle dose anyone know how?

TTRVN · TTRVN

Hello guys, My bike is a 1996 Raid. A few days ago I had a fuel flow problem so today I cleaned the fuel tank and the carburetor. I found a huge amount of gunk clogging the fuel pipe and the needle valve seat, so I cleaned them out. But once I reassembled the bike, there was no way to get it start and run unless I o...

Fladdem · Fladdem

As far as I am aware, my TTR pulls like a train right through the rev range. Well, a small train. But there is a slight bog between 1/4 and 1/2 throttle, but only if held there for a sustained period, i.e. cruising down a long straight 30MPH road, then when you go to take off when the speed limit increases, a...

Serial · Serial

i have a problem...plz help.. my bike since day 1 wont start without pulling out the air choke stick (yep that one on carb) at least the very first time early in the morning that ill try to turn the bike on must pull the choke..after it gets hot everything is good and turns on ok...without air open needed....

Terrence R · Terrence R

I'm wondering if there's such a thing as an aftermarket fuel metering screw with a long shank on it to fit a TTR250. I can easily purchase one for my WR250f as it has a name brand carb. But what about the ttr? If so, do any of u guys know of a part number for one? Thanx.

locky · locky

My TTR runs sweet but i'm unsure if it should run a bit more crisp at lower revs, it could be normal for all i know and i'm happy with the way it runs. Saying this i think i'll give the carb another clean and check within the next few weeks. While searching for carb info i found this, i had to use google transla...

Markvan · Markvan

I could increase the idle speed easy enough. But slowing the idle was abit harder. Found that the spring was catching on the carby body. Took screw out then filed the top of the spring so it Had a slopping edge. Added a tiny bit of grease. Now its easily idled up or down. Use to have idle down with a pair...

arip_rccar · arip_rccar

My OE runs fine in good weather condition but when riding in rain my throttle feels very sticky and when I let off the throttle grip, it jammed at about 1/4 carburetor opening thus I had to force it shut to an idle opening. However when I turned off the engine and twist the throttle open and close, it feels n...

j180 · j180

I've looked through all the posts but can't find an answer. Sometimes the bike ran well then it just cuts out. Tbh it is a lot worse since the new pipe went on, as I'm not sure about carbs I don't know where to start. It also sounds like it's blowing back through the carb at times if that makes sense. Any help w...

samuelttr · samuelttr

Hi Everyone I’ve ordered myself a GYTR Slip on muffler for my 2013 TTR250. I was told by the guys in at Yamaha to just drop the height of the circlip down “one” in the carburettor. I’m just wondering if anyone has any information on whether we can move the circlip down one with it all still attached to t...

Henry · Henry

Hi all, I am home with the flu , so as usual to pass the time,laptop on my belly I started to google and gather information on my latest and hopefully helpful idea. we all know that a fuel/air metering device is expensive, yet it can give us much needed information on the mixture our motor is running on....

Craiginuk · Craiginuk

hi all, sorry if I'm missing something but the ttr250 manual says to push float pin out in direction of arrow. Other advice on here seems to indicate that the arrow shows the direction the pin was installed in and that you push it out in opposite direction to arrow. Which is it please? Mine looks like so...

MarkJ · MarkJ

I need to replace the two leaking o-rings, part number appears to be 5Y1-14397-00 but judging by the price of the genuine Yamaha part they must be made of gold. Hence does anyone know their size so that I can pick up some replacements from the local suppliers?

Spietfriek · Spietfriek

Did a first testride today on my secondhand 2006 TTR.setup at purchase : Stock airfilter with airbox snorkelStock exhaust with restrictor removed50 pilot jet 147 main jet14 x 48 chainset After carb clean replaced all o-rings + diaphragm + checked acceleration pump (ok) Starts fine and revs ou...

Terrence R · Terrence R

Just out of curiosity, I'm wondering what size pilot jets you guys are using in your ttr250's. I know that the 52 and 52.5 pilot jets seem to work good for a lot of people. Anyone using anything bigger? How about smaller? At what elevations? Any mods to justify?

Fladdem · Fladdem

Having trouble with my TTR again. I love her but sometimes I want to throw her to the scrap-man. After recently inadvertently putting diesel in the bike I have been having fuelling issues, I cleaned the fuel lines out, drained the tank and have cleaned the carb about 3 times. I can not see anything wro...

Topic		Started By	Replies	Views	Last Post
	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	859	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	658	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	594	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	1134	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	1143	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	2954	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	1037	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	478	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	364	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	473	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	1543	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	561	Apr 3, 2015 by TTRfan
	choke knob (Preview) does it stick out by about 20mm or does it sit back flush with the carb?	widge	4	436	Mar 23, 2015 by Cubber
	Starting problems - any tips? starting carb jet (Preview) The bike was standing for 18-months with fuel in, carb not drained. It would crank over but not run. So far I have done the following.. - Emptied old fuel in tank, filled up with a couple of litres of new fuel - Carb removed. Took apart from the float side only. Cleaned jets, diaphragm, bowl and float, an...	DC	10	2362	Mar 22, 2015 by DC
	help how do i raise needle?? (Preview) looking too adjust my needle dose anyone know how?	dannydandan	0	382	Feb 22, 2015 by dannydandan
	Too rich mixture but will stall otherwise (Preview) Hello guys, My bike is a 1996 Raid. A few days ago I had a fuel flow problem so today I cleaned the fuel tank and the carburetor. I found a huge amount of gunk clogging the fuel pipe and the needle valve seat, so I cleaned them out. But once I reassembled the bike, there was no way to get it start and run unless I o...	TTRVN	9	811	Feb 10, 2015 by TTRfan
	Am I running lean? (Preview) As far as I am aware, my TTR pulls like a train right through the rev range. Well, a small train. But there is a slight bog between 1/4 and 1/2 throttle, but only if held there for a sustained period, i.e. cruising down a long straight 30MPH road, then when you go to take off when the speed limit increases, a...	Fladdem	1	789	Jan 25, 2015 by Terrence R
	air choke issues (Preview) i have a problem...plz help.. my bike since day 1 wont start without pulling out the air choke stick (yep that one on carb) at least the very first time early in the morning that ill try to turn the bike on must pull the choke..after it gets hot everything is good and turns on ok...without air open needed....	Serial	2	403	Jan 19, 2015 by Serial
	Aftermarket fuel screw to fit these odd TTR carbs? (Preview) I'm wondering if there's such a thing as an aftermarket fuel metering screw with a long shank on it to fit a TTR250. I can easily purchase one for my WR250f as it has a name brand carb. But what about the ttr? If so, do any of u guys know of a part number for one? Thanx.	Terrence R	3	697	Jan 19, 2015 by BM Steve
	A bit of good carb info unless it's been posted before. (Preview) My TTR runs sweet but i'm unsure if it should run a bit more crisp at lower revs, it could be normal for all i know and i'm happy with the way it runs. Saying this i think i'll give the carb another clean and check within the next few weeks. While searching for carb info i found this, i had to use google transla...	locky	3	1022	Jan 14, 2015 by TTRfan
	Idle speed screw. (Preview) I could increase the idle speed easy enough. But slowing the idle was abit harder. Found that the spring was catching on the carby body. Took screw out then filed the top of the spring so it Had a slopping edge. Added a tiny bit of grease. Now its easily idled up or down. Use to have idle down with a pair...	Markvan	2	1278	Dec 30, 2014 by TTRfan
	Throttle jammed when riding in rain (Preview) My OE runs fine in good weather condition but when riding in rain my throttle feels very sticky and when I let off the throttle grip, it jammed at about 1/4 carburetor opening thus I had to force it shut to an idle opening. However when I turned off the engine and twist the throttle open and close, it feels n...	arip_rccar	4	746	Dec 15, 2014 by arip_rccar
	Bike stalling ? (Preview) I've looked through all the posts but can't find an answer. Sometimes the bike ran well then it just cuts out. Tbh it is a lot worse since the new pipe went on, as I'm not sure about carbs I don't know where to start. It also sounds like it's blowing back through the carb at times if that makes sense. Any help w...	j180	11	805	Dec 5, 2014 by j180
	Adjusting the needle circlip in the Carburettor. (Preview) Hi Everyone I’ve ordered myself a GYTR Slip on muffler for my 2013 TTR250. I was told by the guys in at Yamaha to just drop the height of the circlip down “one” in the carburettor. I’m just wondering if anyone has any information on whether we can move the circlip down one with it all still attached to t...	samuelttr	2	786	Nov 25, 2014 by samuelttr
	O2 Oxygen sensor as a means to measure fuel:air ratio DIY (Preview) Hi all, I am home with the flu , so as usual to pass the time,laptop on my belly I started to google and gather information on my latest and hopefully helpful idea. we all know that a fuel/air metering device is expensive, yet it can give us much needed information on the mixture our motor is running on....	Henry	5	1219	Nov 18, 2014 by Bugeye_bob
	Float pin direction (Preview) hi all, sorry if I'm missing something but the ttr250 manual says to push float pin out in direction of arrow. Other advice on here seems to indicate that the arrow shows the direction the pin was installed in and that you push it out in opposite direction to arrow. Which is it please? Mine looks like so...	Craiginuk	1	448	Oct 12, 2014 by TTRfan
	Accelerator pump o-rings (Preview) I need to replace the two leaking o-rings, part number appears to be 5Y1-14397-00 but judging by the price of the genuine Yamaha part they must be made of gold. Hence does anyone know their size so that I can pick up some replacements from the local suppliers?	MarkJ	3	1438	Sep 30, 2014 by MarkJ
	Belgian TTR carb setting issue (Preview) Did a first testride today on my secondhand 2006 TTR.setup at purchase : Stock airfilter with airbox snorkelStock exhaust with restrictor removed50 pilot jet 147 main jet14 x 48 chainset After carb clean replaced all o-rings + diaphragm + checked acceleration pump (ok) Starts fine and revs ou...	Spietfriek	8	978	Sep 18, 2014 by PlumasDude
	Who's using what pilots? (Preview) Just out of curiosity, I'm wondering what size pilot jets you guys are using in your ttr250's. I know that the 52 and 52.5 pilot jets seem to work good for a lot of people. Anyone using anything bigger? How about smaller? At what elevations? Any mods to justify?	Terrence R	15	1097	Sep 11, 2014 by TTRfan
	Revving up on her own (Preview) Having trouble with my TTR again. I love her but sometimes I want to throw her to the scrap-man. After recently inadvertently putting diesel in the bike I have been having fuelling issues, I cleaned the fuel lines out, drained the tank and have cleaned the carb about 3 times. I can not see anything wro...	Fladdem	1	967	Aug 7, 2014 by Fladdem
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