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

TTRfan · TTRfan

When money is no object - https://www.lectronfuelsystems.com/index.php/street/four-stroke-carbs.html The carb got a rave review in the latest RUST magazine - https://www.rustsports.com/ I love the idea of the transparent float bowl - almost as much as a transparent fuel tank.... Brian

tom13 · tom13

Tłumacz Google - Po długich torturach ze starym i uszkodzonym gaźnikiem zrezygnowałem i dziś pojawiłem się w pięknym nowym pudełku. Jestem szczęśliwy!

dlee22 · dlee22

Hi all, I have a 93 oe with a few raid parts, which recently has had new pisyon rings, cam chain etc. Before i took the bike apart it was running 142/48 jetting and started reasonably well and idled perfectly. Since then i have "rebuilt" the carb using an all balls kits from the ttr shop. I tried to run the...

purdoy25 · purdoy25

Hey there. So I noticed when I run my bike wide open/full throttle and then right after closing the throttle or even going half-throttle, my engine 'blips' and surges for about half a second before engine braking. I'm wondering if this is an issue with carb tuning. It's kinda annoying esp. when speedi...

TTRfan · TTRfan

These are the usual culprits! I have just stripped them out of a carb that has been standing unused for a long time. The float bowl gasket was hard and flattened. The diaphragm had fused to the carb body and had to be prised off plus the two small O rings by the diaphragm had seen better days. The carb wasn't...

JCW · JCW

As most of us have all known for years, barely twisting the throttle on a 250-450 race bike will make it launch hard. The same throttle response on a TTR is much smoother and less aggressive. For the first time the other day, I twisted it much farther and it flew from 40-70 mph with plenty of power le...

TTRfan · TTRfan

Jarrah called it a "fuel metering screw" but I have also seen it called the "air" screw. I am trying to resolve an issue on a carb I am testing and it has made me question how this screw actually works. I could turn the screw all the way in and many turns out and it made no difference to the slow running Does it...

TTRfan · TTRfan

It is very difficult to remove/replace the choke with a standard spanner as there just isn't any room to turn it. I finally got motivated to grind down an old 12mm open-ended spanner to give some clearance and it works a treat

TTRfan · TTRfan

The page above came from a blue TTR manual and it's different to the instructions in the older TTRs' manual which, in step 4 (actually it's instruction 5 in the older manual), adds "and warm up the engine for several minutes" I am missing something here - why warm the engine up on the older TTRs? I am about...

Braaaap · Braaaap

Ok guys, new here So I'm sorry if this has been covered. I got my hands on an 04 blue 250 pretty much free in a trade as boot. It was bored .20 over and when they put it back together it wouldn't run. After I tore into it, ended up being bent exhaust valves. Got all that fixed. Then the carb was very dirty, and of c...

Mike Wright · Mike Wright

Has anyone fitted an inline fuel filter and if so what is the size please 6mm or 8mm? Thankyou

Moo · Moo

Thought it would be an interesting thread for everyone to post what Jets they are running along with any mods, exhausts and altitudes they are using. Mainly because there still seems to be a lot of different standard jets the TTRs run and it's unclear why? I've just fully rebuilt my bluey with the all ba...

Blaine brady · Blaine brady

hello my name is Blaine Brady im from the America it should go with out saying but i have a us model bike not the European one im 14 years old and this ttr 250 2003 is my first modern dirt bike i have been riding vintage my whole motorcycle career my father took my carb off and cleaned it did a great job when we...

mikem0287 · mikem0287

I am currently rebuilding a 94 OE, amongst other things I found that the float valve wasn't closing properly. I have read the warnings about breaking the posts while trying to remove the float pin, so I was hesitant to try and remove the valve at first. After a bit of reading on the internet I found a tip to...

JCW · JCW

I just opened the air box intake, and cut 6 3/8" holes in the exhaust next to the main hole (stock muffler) to help reduce the restrictions in the bike. It ran very well before, and I'm wondering if I need to automatically richen the carb (hopefully with a needle clip adjustment) just because of this. ...

JCW · JCW

I have an 02 model and I would like to buy some hex head carb bowl screws. Does anyone know where I can purchase some? Thanks

Big G · Big G

I'm going to fit a K&N air filter on my TTR. Has anyone done this? - feedback would be appreciated if you have

ttr steve · ttr steve

Hi All I have in the shop now the all balls carb repair kits, still don't know how to add that (here) button so a link instead https://totallyttrs.com/epages/699105d9-e4cc-4b32-b236-84e72cd67f84.sf/en_GB/?ObjectPath=/Shops/699105d9-e4cc-4b32-b236-84e72cd67f84/Products/TTR-07...

Dan-in-a-Van · Dan-in-a-Van

The bike has developed a bit of an issue today. It starts ok and idles with the choke off after warming up, without any problems. The trouble is anything more than 1/4 throttle and the revs don't rise and the engine splutters? It was dark and cold when this decided to happen, but luckily it happened just a...

TTRfan · TTRfan

I am going to try and rebuild a carb to run and look as close as possible to new as I can. I am already into it 2-3 hours so it's gonna be a long job! The finishing touch will be to re-plate the rusty steel parts and get the same colour as on a new carb using the Zinc/Nickel Plating Kit from Gateros Plating. These...

katana · katana

Can someone give me dimensions on the fuel screw o-ring please?

sledman 1 · sledman 1

I just started a TTR 250 restore transformation. !st was check the valves. Lots of incorrect information out there about the TTR 250 head. Its a YZ bucket and shim over valve under the cam, nice and simple, same shims as all the YZ and I would guess many road bikes. 5,000 unknown miles on my bike each v...

widge · widge

My blue ttr250 has been standing a long time. It would not start, checked the plug had sparks, so following the excellent guide removed the carburetor. I took the carb to be cleaned and asked about the state of it. I was told it was green and manky inside. Refitted the carb, replaced the plug. It wou...

katana · katana

I stripped the carb today. Good news, I didn't break the float pin post. Bad news, the diaphragm is toast. Weird news, the pumper wouldn't have worked anyway. In stead of 2 o-rings, the in and out jets were blocked off by solid rubber rings. I wonder if it was disabled from the factory or whether som...

TTRfan · TTRfan

I refurbished a carb this morning and was surprised at just how much debris sat on top of the filter. It's a wonder the TTR ran

TTRfan · TTRfan

This week I have mostly been fettling the spare carbs I put back for projects that I am not now going to do! The first two just needed cleaning up and testing and they both worked fine. The first is on 147-50 jetting and the second on 137-50. These jets were what were already fitted so I didn't need to pull t...

Toinky · Toinky

I just rebuilt the carb on my '04 (USA version). Bought a kit on eBay. All was going well, especially with this useful thread: http://ttr250.activeboard.com/t55374798/rebuilding-a-ttr250-teikei-y30p-carburettor/?page=1 , until I got done and had a very small spring and some sort of tiny pi...

uncletooty · uncletooty

Hi,can anyone help with a problem I have with my TTR 250 its 2004 blue model very low milage. I bought it some time ago and with being stood most of its life it ran terrible when I first used it.I changed the fuel and give the carb a basic clean and if ran alot better but did have a slight bog down/hestitation...

Stephen craig · Stephen craig

hi, spent the last few days reading posts and sticky's on jetting and given up so hopefully someone can guide me in the right direction. bike was stock open enduro and just given it a overhaul ready for some LDT's Later this year. I have trimmed the snorkel down to the minimum and fitted a FMF power core 4....

Moo · Moo

So.. having some trouble getting the carb running right with any kind of open exhaust. Bike is a 2005 Bluey, jetting is standard, 50 pilot and 147 main. Bike runs fine with a standard exhaust, no hesitation or blips and pulls right through the rev range. I've introduced both a motad exhaust (which runs...

Topic		Started By	Replies	Views	Last Post
	Lectron Gen II 4-stroke carburettor (Preview) When money is no object - https://www.lectronfuelsystems.com/index.php/street/four-stroke-carbs.html The carb got a rave review in the latest RUST magazine - https://www.rustsports.com/ I love the idea of the transparent float bowl - almost as much as a transparent fuel tank.... Brian	TTRfan	4	511	Apr 6, 2018 by Base
	new carb (Preview) Tłumacz Google - Po długich torturach ze starym i uszkodzonym gaźnikiem zrezygnowałem i dziś pojawiłem się w pięknym nowym pudełku. Jestem szczęśliwy!	tom13	3	179	Mar 30, 2018 by tom13
	Carb seems to drag in air... (Preview) Hi all, I have a 93 oe with a few raid parts, which recently has had new pisyon rings, cam chain etc. Before i took the bike apart it was running 142/48 jetting and started reasonably well and idled perfectly. Since then i have "rebuilt" the carb using an all balls kits from the ttr shop. I tried to run the...	dlee22	12	331	Feb 28, 2018 by micccki
	Engine 'blips' when closing throttle from WOT carburettor throttle blipping blip weird (Preview) Hey there. So I noticed when I run my bike wide open/full throttle and then right after closing the throttle or even going half-throttle, my engine 'blips' and surges for about half a second before engine braking. I'm wondering if this is an issue with carb tuning. It's kinda annoying esp. when speedi...	purdoy25	25	738	Feb 19, 2018 by purdoy25
	Carb leaking petrol? (Preview) These are the usual culprits! I have just stripped them out of a carb that has been standing unused for a long time. The float bowl gasket was hard and flattened. The diaphragm had fused to the carb body and had to be prised off plus the two small O rings by the diaphragm had seen better days. The carb wasn't...	TTRfan	44	1033	Feb 7, 2018 by kitkat
	Slower throttle response compared to race bikes (Preview) As most of us have all known for years, barely twisting the throttle on a 250-450 race bike will make it launch hard. The same throttle response on a TTR is much smoother and less aggressive. For the first time the other day, I twisted it much farther and it flew from 40-70 mph with plenty of power le...	JCW	7	337	Jan 31, 2018 by ttboof
	How does the pilot screw on the TTR250 OEM carb work? (Preview) Jarrah called it a "fuel metering screw" but I have also seen it called the "air" screw. I am trying to resolve an issue on a carb I am testing and it has made me question how this screw actually works. I could turn the screw all the way in and many turns out and it made no difference to the slow running Does it...	TTRfan	7	383	Jan 28, 2018 by ttboof
	Choke removal and replacement - simple spanner mod to help! (Preview) It is very difficult to remove/replace the choke with a standard spanner as there just isn't any room to turn it. I finally got motivated to grind down an old 12mm open-ended spanner to give some clearance and it works a treat	TTRfan	0	191	Jan 28, 2018 by TTRfan
	Adjusting the fuel level in the carb bowl - float height (Preview) The page above came from a blue TTR manual and it's different to the instructions in the older TTRs' manual which, in step 4 (actually it's instruction 5 in the older manual), adds "and warm up the engine for several minutes" I am missing something here - why warm the engine up on the older TTRs? I am about...	TTRfan	13	1729	Jan 27, 2018 by TTRfan
	Carb questions (Preview) Ok guys, new here So I'm sorry if this has been covered. I got my hands on an 04 blue 250 pretty much free in a trade as boot. It was bored .20 over and when they put it back together it wouldn't run. After I tore into it, ended up being bent exhaust valves. Got all that fixed. Then the carb was very dirty, and of c...	Braaaap	20	475	Jan 23, 2018 by TTRfan
	Inline fuel filter information - hints & tips (Preview) Has anyone fitted an inline fuel filter and if so what is the size please 6mm or 8mm? Thankyou	Mike Wright	15	2638	Jan 22, 2018 by TTRfan
	What Jets are you running? (Preview) Thought it would be an interesting thread for everyone to post what Jets they are running along with any mods, exhausts and altitudes they are using. Mainly because there still seems to be a lot of different standard jets the TTRs run and it's unclear why? I've just fully rebuilt my bluey with the all ba...	Moo	6	379	Dec 29, 2017 by honda15i
	red hot pipe (Preview) hello my name is Blaine Brady im from the America it should go with out saying but i have a us model bike not the European one im 14 years old and this ttr 250 2003 is my first modern dirt bike i have been riding vintage my whole motorcycle career my father took my carb off and cleaned it did a great job when we...	Blaine brady	2	234	Dec 28, 2017 by TTRfan
	Removing float pin (Preview) I am currently rebuilding a 94 OE, amongst other things I found that the float valve wasn't closing properly. I have read the warnings about breaking the posts while trying to remove the float pin, so I was hesitant to try and remove the valve at first. After a bit of reading on the internet I found a tip to...	mikem0287	8	1168	Dec 26, 2017 by dlee22
	Carb adjustment question (Preview) I just opened the air box intake, and cut 6 3/8" holes in the exhaust next to the main hole (stock muffler) to help reduce the restrictions in the bike. It ran very well before, and I'm wondering if I need to automatically richen the carb (hopefully with a needle clip adjustment) just because of this. ...	JCW	16	856	Dec 20, 2017 by JCW
	Replacement bowl screws (Preview) I have an 02 model and I would like to buy some hex head carb bowl screws. Does anyone know where I can purchase some? Thanks	JCW	4	421	Dec 15, 2017 by JCW
	K&N air filter (Preview) I'm going to fit a K&N air filter on my TTR. Has anyone done this? - feedback would be appreciated if you have	Big G	4	255	Dec 12, 2017 by Big G
	All Balls carb repair kit (Preview) Hi All I have in the shop now the all balls carb repair kits, still don't know how to add that (here) button so a link instead https://totallyttrs.com/epages/699105d9-e4cc-4b32-b236-84e72cd67f84.sf/en_GB/?ObjectPath=/Shops/699105d9-e4cc-4b32-b236-84e72cd67f84/Products/TTR-07...	ttr steve	13	761	Dec 5, 2017 by ttr steve
	Air leak? (Preview) The bike has developed a bit of an issue today. It starts ok and idles with the choke off after warming up, without any problems. The trouble is anything more than 1/4 throttle and the revs don't rise and the engine splutters? It was dark and cold when this decided to happen, but luckily it happened just a...	Dan-in-a-Van	10	435	Dec 3, 2017 by ttr steve
	Carburettor deep clean and rebuild (Preview) I am going to try and rebuild a carb to run and look as close as possible to new as I can. I am already into it 2-3 hours so it's gonna be a long job! The finishing touch will be to re-plate the rusty steel parts and get the same colour as on a new carb using the Zinc/Nickel Plating Kit from Gateros Plating. These...	TTRfan	14	830	Nov 6, 2017 by TTRfan
	fuel screw o ring (Preview) Can someone give me dimensions on the fuel screw o-ring please?	katana	3	280	Nov 4, 2017 by katana
	carb upgrade (Preview) I just started a TTR 250 restore transformation. !st was check the valves. Lots of incorrect information out there about the TTR 250 head. Its a YZ bucket and shim over valve under the cam, nice and simple, same shims as all the YZ and I would guess many road bikes. 5,000 unknown miles on my bike each v...	sledman 1	0	274	Oct 19, 2017 by sledman 1
	bike starts then stops. (Preview) My blue ttr250 has been standing a long time. It would not start, checked the plug had sparks, so following the excellent guide removed the carburetor. I took the carb to be cleaned and asked about the state of it. I was told it was green and manky inside. Refitted the carb, replaced the plug. It wou...	widge	4	384	Oct 14, 2017 by TTRfan
	I stripped my carb today (Preview) I stripped the carb today. Good news, I didn't break the float pin post. Bad news, the diaphragm is toast. Weird news, the pumper wouldn't have worked anyway. In stead of 2 o-rings, the in and out jets were blocked off by solid rubber rings. I wonder if it was disabled from the factory or whether som...	katana	8	562	Aug 26, 2017 by katana
	Petrol filter above float valve seat/needle - float valve filter (Preview) I refurbished a carb this morning and was surprised at just how much debris sat on top of the filter. It's a wonder the TTR ran	TTRfan	8	2907	Aug 12, 2017 by TTRfan
	Carb jetting fun! (Preview) This week I have mostly been fettling the spare carbs I put back for projects that I am not now going to do! The first two just needed cleaning up and testing and they both worked fine. The first is on 147-50 jetting and the second on 137-50. These jets were what were already fitted so I didn't need to pull t...	TTRfan	2	371	Aug 5, 2017 by TTRfan
	Carb Rebuild--parts leftover! (Preview) I just rebuilt the carb on my '04 (USA version). Bought a kit on eBay. All was going well, especially with this useful thread: http://ttr250.activeboard.com/t55374798/rebuilding-a-ttr250-teikei-y30p-carburettor/?page=1 , until I got done and had a very small spring and some sort of tiny pi...	Toinky	9	514	Aug 4, 2017 by TTRfan
	TTR carb guru required (Preview) Hi,can anyone help with a problem I have with my TTR 250 its 2004 blue model very low milage. I bought it some time ago and with being stood most of its life it ran terrible when I first used it.I changed the fuel and give the carb a basic clean and if ran alot better but did have a slight bog down/hestitation...	uncletooty	12	626	Aug 2, 2017 by ttr steve
	Jetting frustration (Preview) hi, spent the last few days reading posts and sticky's on jetting and given up so hopefully someone can guide me in the right direction. bike was stock open enduro and just given it a overhaul ready for some LDT's Later this year. I have trimmed the snorkel down to the minimum and fitted a FMF power core 4....	Stephen craig	0	361	Jul 23, 2017 by Stephen craig
	Carb Gurus - Need Help (Preview) So.. having some trouble getting the carb running right with any kind of open exhaust. Bike is a 2005 Bluey, jetting is standard, 50 pilot and 147 main. Bike runs fine with a standard exhaust, no hesitation or blips and pulls right through the rev range. I've introduced both a motad exhaust (which runs...	Moo	5	526	Jul 21, 2017 by Moo
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