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

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...

TTRfan · TTRfan

I have a carb that checked over fine. All jets cleaned or replaced, etc. However, there was an idle problem where on occasions the engine would run at a fast tickover and other times it would be OK. I know there is another post about these symptoms somewhere but darned if I can find it I took my own advice a...

ianttr · ianttr

Hi I live in the pyrenees at 650m say 2000 feet or so.My 2004 ttr blue came with the carb box cut open, all snorkels etc. cut off and an after market exhaust, it never ran right. The previous owner had not re jetted. I changed the jets to run with the after market exhaust and it ran great but far too noisy for th...

romeshs · romeshs

Hi All, i have recently bought a used 1993 TTR 250. Purple frame. bike was abused, but engine was remarkably well maintained. no unwanted noises, etc. my problem is that when im riding and through the revs, low end, runs perfectly, WOT, runns pretty well too. but in between, like with the throttle ope...

goodquest · goodquest

Just purchased a 2006 ttr-250 which ran perfect except I noticed it had a slow carburetor leak. I pulled the carb and replaced the diaphragm assembly which was stuck to the carb and bubbled. Now if I crack the throttle real quick the engine dies. If the choke is pulled out all the way it still dies abou...

BM Steve · BM Steve

Hi All Thanks To Jarrah, who kindly sent me some leftover carby bits, seals, gaskets, accelerator pump, O-Rings etc...and especially the 52.5 Main, my bike is running great now A bit more acceleration and power all over, it's great in the singles, smooth on rough uphills, just better all round I remo...

Terrence R · Terrence R

Ok, so the bike seems to be running really good. Nice throttle response and great power distribution from bottom to top. Looking at the spark plug, it looks grossly lean. I check the float height as follows: put a clear hose on the carb drain. Opened it up. Set the bike up level. Fuel filled up to as far as t...

Terrence R · Terrence R

I just found a part that I forgot to put back in my carb after fooling around with jetting. Oops!

how important is this? Is it ok to ride without it? Probably not, but I would like to make sure before I tear my carb apart for the 10th time within the last week. Please help.

Terrence R · Terrence R

I just got done modding my bike after ordering parts all winter. I drove it on a dry winter day in stock form and it worked great, but just needed a little extra arm pump. I just installed an FMF PC4, twin air filter and removed snorkel along with opening up the hole a bit, and 6 sigma jet kit. It came with 3 mai...

Archershome · Archershome

Hello yes its another question on jets... I am confused and have read other forums. Ok TTR250 04 plate, fitted new twin air filter and FMF Q4, snorkel still fitted as gone in some big puddles, bike seems a little sluggish in comparison to a friends with similar set up. I have a 14/52 sprocket set up and wo...

chrisstdt · chrisstdt

I have recently enlarged my airbox snorkel ,the bike is now running lean as i have uk standard 147 / 50 jets ,brian has suggested yamaha 150 / 52 but mikuni jats are cheaper and easier for me to get So my question is has anyone got experience of mikuni jets and how they compare to yamaha jets or am i best to st...

PlumasDude · PlumasDude

There was some question about stock jets on US models - for the record, I pulled the carb on my 2003 US model, which I'm pretty certain has never been touched, and the jets are in fact 137/50 (as Jarrah had opined) even though my manual says the pilot is 52. I was told this bike was originally sold in Alaska...

domski1 · domski1

Has anyone stripped a carb and found this item missing? I stripped and cleaned mine the other day and then had a look through one of Brian's guides on carbs and found I didn't have the valve in the photo below. I can't see how I have lost it but not sure how it would run if missing? Sorry for stealing you pic Br...

Topic		Started By	Replies	Views	Last Post
	choke knob (Preview) does it stick out by about 20mm or does it sit back flush with the carb?	widge	4	516	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	2842	Mar 22, 2015 by DC
	help how do i raise needle?? (Preview) looking too adjust my needle dose anyone know how?	dannydandan	0	470	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	917	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	1026	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	494	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	822	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	1255	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	1690	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	993	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	899	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	1084	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	1369	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	530	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	1869	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	1074	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	1242	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	1261	Aug 7, 2014 by Fladdem
	Carb with slow running problem (Preview) I have a carb that checked over fine. All jets cleaned or replaced, etc. However, there was an idle problem where on occasions the engine would run at a fast tickover and other times it would be OK. I know there is another post about these symptoms somewhere but darned if I can find it I took my own advice a...	TTRfan	12	3099	Aug 5, 2014 by TTRfan
	Carb tuning issues....help please! carb jets airbox original exhaust (Preview) Hi I live in the pyrenees at 650m say 2000 feet or so.My 2004 ttr blue came with the carb box cut open, all snorkels etc. cut off and an after market exhaust, it never ran right. The previous owner had not re jetted. I changed the jets to run with the after market exhaust and it ran great but far too noisy for th...	ianttr	1	1989	Aug 5, 2014 by TTRfan
	Mid range acceleration issue (Preview) Hi All, i have recently bought a used 1993 TTR 250. Purple frame. bike was abused, but engine was remarkably well maintained. no unwanted noises, etc. my problem is that when im riding and through the revs, low end, runs perfectly, WOT, runns pretty well too. but in between, like with the throttle ope...	romeshs	21	2181	Jul 1, 2014 by TT-R250M
	2006 TTR-250 Carburetor adjustment (Preview) Just purchased a 2006 ttr-250 which ran perfect except I noticed it had a slow carburetor leak. I pulled the carb and replaced the diaphragm assembly which was stuck to the carb and bubbled. Now if I crack the throttle real quick the engine dies. If the choke is pulled out all the way it still dies abou...	goodquest	22	8732	Jun 20, 2014 by TT-R250M
	Recent Carby Overhaul (Preview) Hi All Thanks To Jarrah, who kindly sent me some leftover carby bits, seals, gaskets, accelerator pump, O-Rings etc...and especially the 52.5 Main, my bike is running great now A bit more acceleration and power all over, it's great in the singles, smooth on rough uphills, just better all round I remo...	BM Steve	4	1028	Jun 17, 2014 by BM Steve
	Carb is makin me crazy! (Preview) Ok, so the bike seems to be running really good. Nice throttle response and great power distribution from bottom to top. Looking at the spark plug, it looks grossly lean. I check the float height as follows: put a clear hose on the carb drain. Opened it up. Set the bike up level. Fuel filled up to as far as t...	Terrence R	9	1128	Jun 9, 2014 by TT-R250M
	Oops! This looks important! (Preview) I just found a part that I forgot to put back in my carb after fooling around with jetting. Oops! how important is this? Is it ok to ride without it? Probably not, but I would like to make sure before I tear my carb apart for the 10th time within the last week. Please help.	Terrence R	8	1208	May 27, 2014 by TT-R250M
	Float level maybe? (Preview) I just got done modding my bike after ordering parts all winter. I drove it on a dry winter day in stock form and it worked great, but just needed a little extra arm pump. I just installed an FMF PC4, twin air filter and removed snorkel along with opening up the hole a bit, and 6 sigma jet kit. It came with 3 mai...	Terrence R	32	5937	May 20, 2014 by Yuraku
	Opinions Please.... Confused Jets Popping Exhaust (Preview) Hello yes its another question on jets... I am confused and have read other forums. Ok TTR250 04 plate, fitted new twin air filter and FMF Q4, snorkel still fitted as gone in some big puddles, bike seems a little sluggish in comparison to a friends with similar set up. I have a 14/52 sprocket set up and wo...	Archershome	7	1485	May 20, 2014 by TT-R250M
	jet sizes yamaha / mikuni (Preview) I have recently enlarged my airbox snorkel ,the bike is now running lean as i have uk standard 147 / 50 jets ,brian has suggested yamaha 150 / 52 but mikuni jats are cheaper and easier for me to get So my question is has anyone got experience of mikuni jets and how they compare to yamaha jets or am i best to st...	chrisstdt	13	3222	Apr 30, 2014 by TT-R250M
	stock jets 2003 US model (Preview) There was some question about stock jets on US models - for the record, I pulled the carb on my 2003 US model, which I'm pretty certain has never been touched, and the jets are in fact 137/50 (as Jarrah had opined) even though my manual says the pilot is 52. I was told this bike was originally sold in Alaska...	PlumasDude	3	802	Apr 11, 2014 by TT-R250M
	Carb float bowl check valve (Preview) Has anyone stripped a carb and found this item missing? I stripped and cleaned mine the other day and then had a look through one of Brian's guides on carbs and found I didn't have the valve in the photo below. I can't see how I have lost it but not sure how it would run if missing? Sorry for stealing you pic Br...	domski1	15	5993	Apr 10, 2014 by pedrosan
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