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

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...

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...

Topic		Started By	Replies	Views	Last Post
	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	1764	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	836	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	567	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	3039	Mar 22, 2015 by DC
	help how do i raise needle?? (Preview) looking too adjust my needle dose anyone know how?	dannydandan	0	505	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	972	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	1073	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	534	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	967	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	1293	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	1834	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	1032	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	947	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	1141	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	1456	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	566	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	1957	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	1123	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	1292	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	1381	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	3396	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	2181	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	2399	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	9676	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	1080	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	1177	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	1259	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	6142	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	1580	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	3441	Apr 30, 2014 by TT-R250M
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