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

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

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

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

http://ttr250.activeboard.com/t55374798/rebuilding-a-ttr250-teikei-y30p-carburettor/?page=1

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...

threshold · threshold

Hey guys. I am taking the snorkel off my bike as I don't do deep water runs. I have also a barret aftermarket exhaust coming, so would a 52.5 pilot and 140 small round main be sweet for an uncorked and derestricted TTR?? I got this off a thumpertalk sticky, which is a sticky off the ttr250.com page. It sou...

DANKWHEELIE420 · DANKWHEELIE420

hello there ttr riders i need help on tuning my bike i live at 750m above sea level and need help on making my bike get the best power

Slick Nick · Slick Nick

My carb slide sticks up when you let the throttle out slowly my carb was out yesterday and I tightened the retention screws and it worked for a lil but it's back how it was

FBRConcepts · FBRConcepts

https://www.amazon.com/Cable-Carbrettor-Accelerating-Yamaha-TTR250/dp/B06X...

FBRConcepts · FBRConcepts

Hey Guys, I spent a few hours sifting through stickies and threads looking for information on jetting the carb on my fathers new bike for some mods we are getting ready to install. I am hoping to order some jet sizes that will get us dialed in before hand. Bike: 2005 TTR 250 US Model Elevation: Sea Leve...

Topic		Started By	Replies	Views	Last Post
	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	5988	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	1604	Jan 31, 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	837	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	16239	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	1707	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	36146	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	2037	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	1193	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	3427	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	2595	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	1706	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	769	Dec 12, 2017 by Big G
	All Balls carb repair kit (Preview) 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	2071	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	1498	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	3386	Nov 6, 2017 by TTRfan
	fuel screw o ring (Preview) Can someone give me dimensions on the fuel screw o-ring please?	katana	3	789	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	1558	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	1346	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	2078	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	16921	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	1865	Aug 5, 2017 by TTRfan
	Carb Rebuild--parts leftover! (Preview) http://ttr250.activeboard.com/t55374798/rebuilding-a-ttr250-teikei-y30p-carburettor/?page=1	Toinky	9	3049	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	2304	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	1153	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	1467	Jul 21, 2017 by Moo
	Open enduro carby jetting (Preview) Hey guys. I am taking the snorkel off my bike as I don't do deep water runs. I have also a barret aftermarket exhaust coming, so would a 52.5 pilot and 140 small round main be sweet for an uncorked and derestricted TTR?? I got this off a thumpertalk sticky, which is a sticky off the ttr250.com page. It sou...	threshold	11	2386	Jul 12, 2017 by leigh
	tuning on elevation (Preview) hello there ttr riders i need help on tuning my bike i live at 750m above sea level and need help on making my bike get the best power	DANKWHEELIE420	0	755	Jul 2, 2017 by DANKWHEELIE420
	Carb slide sticking (Preview) My carb slide sticks up when you let the throttle out slowly my carb was out yesterday and I tightened the retention screws and it worked for a lil but it's back how it was	Slick Nick	6	1704	Jul 2, 2017 by DANKWHEELIE420
	Jaguar Pro TTR 250 Carb? (Preview) https://www.amazon.com/Cable-Carbrettor-Accelerating-Yamaha-TTR250/dp/B06X...	FBRConcepts	4	1839	Jun 16, 2017 by FBRConcepts
	Carb Jets for mods on 2005 TTR 250 (Preview) Hey Guys, I spent a few hours sifting through stickies and threads looking for information on jetting the carb on my fathers new bike for some mods we are getting ready to install. I am hoping to order some jet sizes that will get us dialed in before hand. Bike: 2005 TTR 250 US Model Elevation: Sea Leve...	FBRConcepts	0	1199	Jun 16, 2017 by FBRConcepts
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