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

mmwain · mmwain

Can't find this one anywhere in the 5 pages of carb posts so here goes... Bike has a very intermittent fault, will run perfectly for a long time then suddenly stops completely or misfires on mid/high throttle. The problem started after stripping the bike for frame paint and valve guide seals, but did...

ttrtim · ttrtim

Hi, Hopefully there's someone out there who's TTR'd the Pyrenees! Myself and a mate are going in a months time, both ride standard TTR250's, so the question is, will we need to re-jet? Going to be 10,000 feet max. Appreciate any help/light anyone can shed please. cheers, Tim

Forgorin · Forgorin

So, I put on a new muffler over the weekend and took the bike for a spin. Wow! More grunt! I feel like she has more torque now (able to change gears earlier at lower speeds). I am hearing a bit of backfire when decelerating at higher RPMs. I am unsure if this is because it is running lean or rich (haven't...

FFBeefcake · FFBeefcake

I recently inherited a 2004 ttr250 from a fellow firefighter who passed away. The bike was given to me without a carb. It is a project bike with intention of eventually making it street legal as a tribute bike to continue my buddies plan. I've looked to buy the teikei y30p but am unable to find one online....

tom13 · tom13

Google translator. Hello. I installed a new original carburettor and kickstarter does not start. Is it possible in the new carburettor that the fuel level is bad?

Benjah · Benjah

Anyone know where to get hold of one of these? Haven't had much luck with Mr Google. Cheers

z1g · z1g

Hi Guys, I thought i had my idle screw set right. When cold, fires up straight away, ocasonially use choke for a couple seconds. Idles fine, sounds fine not revving hard. Noticed tonight when i went for a ride, that coming into intersections/round abouts. Anytime i pulled the clutch in it seemed to be o...

Rydasc6102 · Rydasc6102

dumb question but is the choke suposed to significantly raise the RPMs?

Rydasc6102 · Rydasc6102

I have three questions about my carb 1. Should it leak gas if the bike is on its side? 2. Should it stay running when it's on it's side? 3. When I do a coldstart should the bike cut out whenever I blip the throttle thanks.

Ether · Ether

I've taken apart my carb to deal with some leakage and it has clearly been taken apart before. One of the float arms had been broken off and pinned back together. There is also no white plastic insert seen in the following pic. What purpose does the white plastic bit have and does it matter if it doesn't ha...

TTRfan · TTRfan

Ever wondered what the little black bottle plumbed into the TTR's air intake was supposed to do? I confess to having been ignorant until reading a review of the new Beta enduro bikes in the latest TBM magazine when the YEIS was mentioned. I did a search on t'internet and found some more information.Ap...

z1g · z1g

HI all, Chasing up a fuel leak. Have not had time to pull bits and pieces off the bike.... but. I have decided to run inline fuel filter *crazy kid* Put a brand new one (filter) on tonight, and noticed that even when fuel tap(peac o c k) was in the off position, fuel was coming out. I would not say, full flow, b...

ttr steve · ttr steve

As I am always asking Bri to test kits that I have in the shop, thought I would have a go at fitting the all balls carb kit, as my carb needed a overhaul on my OE that I am going to do a full rebuild/ 350 kit on. So I started off stripping the carb down Now I think most people buy the kits, just to use all the gaskets O...

Ether · Ether

My carb has a leak from the diaphram area at the bottom of the carb so the diaphram is probably toast, I'll need to replace it. My question is will this issue have an effect on performance? I have no other TTR to compare mine to but if I had to guess I would say it's feeling underpowered.

TTRfan · TTRfan

I have a carb that runs rich on tickover. Just touch the choke and its stalls immediately. I have set the float height artificially low - made no difference so it's not flooding. I have checked that the choke is seating properly so that's not the issue. I tried a smaller pilot jet and it made no difference...

TTRfan · TTRfan

https://www.lectronfuelsystems.com/index.php/street/four-stroke-carbs.html

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

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

Topic		Started By	Replies	Views	Last Post
	Engine stops on hard accelleration (Preview) Can't find this one anywhere in the 5 pages of carb posts so here goes... Bike has a very intermittent fault, will run perfectly for a long time then suddenly stops completely or misfires on mid/high throttle. The problem started after stripping the bike for frame paint and valve guide seals, but did...	mmwain	9	1411	Sep 24, 2018 by ttboof
	Do I need to re-jet for Pyrenees? Anyone been?! (Preview) Hi, Hopefully there's someone out there who's TTR'd the Pyrenees! Myself and a mate are going in a months time, both ride standard TTR250's, so the question is, will we need to re-jet? Going to be 10,000 feet max. Appreciate any help/light anyone can shed please. cheers, Tim	ttrtim	12	1852	Aug 20, 2018 by dlee22
	New muffler does carb need adjusting? (Preview) So, I put on a new muffler over the weekend and took the bike for a spin. Wow! More grunt! I feel like she has more torque now (able to change gears earlier at lower speeds). I am hearing a bit of backfire when decelerating at higher RPMs. I am unsure if this is because it is running lean or rich (haven't...	Forgorin	12	1554	Aug 6, 2018 by Forgorin
	Bike without a carb Carburetor (Preview) I recently inherited a 2004 ttr250 from a fellow firefighter who passed away. The bike was given to me without a carb. It is a project bike with intention of eventually making it street legal as a tribute bike to continue my buddies plan. I've looked to buy the teikei y30p but am unable to find one online....	FFBeefcake	1	1709	Jul 8, 2018 by mossproof
	Strange fuel level (Preview) Google translator. Hello. I installed a new original carburettor and kickstarter does not start. Is it possible in the new carburettor that the fuel level is bad?	tom13	5	1290	Jun 29, 2018 by tom13
	Source for #52 pilot Jet (Preview) Anyone know where to get hold of one of these? Haven't had much luck with Mr Google. Cheers	Benjah	1	983	Jun 28, 2018 by z1g
	High Idle when RIDING. (Preview) Hi Guys, I thought i had my idle screw set right. When cold, fires up straight away, ocasonially use choke for a couple seconds. Idles fine, sounds fine not revving hard. Noticed tonight when i went for a ride, that coming into intersections/round abouts. Anytime i pulled the clutch in it seemed to be o...	z1g	38	13175	Jun 12, 2018 by z1g
	Choke raises idle (Preview) dumb question but is the choke suposed to significantly raise the RPMs?	Rydasc6102	2	1179	May 22, 2018 by ttboof
	Carb questions (Preview) I have three questions about my carb 1. Should it leak gas if the bike is on its side? 2. Should it stay running when it's on it's side? 3. When I do a coldstart should the bike cut out whenever I blip the throttle thanks.	Rydasc6102	7	1329	May 13, 2018 by Rydasc6102
	Is my carb missing bits? (Preview) I've taken apart my carb to deal with some leakage and it has clearly been taken apart before. One of the float arms had been broken off and pinned back together. There is also no white plastic insert seen in the following pic. What purpose does the white plastic bit have and does it matter if it doesn't ha...	Ether	6	1041	May 7, 2018 by TTRfan
	Yamaha Energy Induction System (YEIS) - boost bottle, air chamber, resonator (Preview) Ever wondered what the little black bottle plumbed into the TTR's air intake was supposed to do? I confess to having been ignorant until reading a review of the new Beta enduro bikes in the latest TBM magazine when the YEIS was mentioned. I did a search on t'internet and found some more information.Ap...	TTRfan	11	22545	May 4, 2018 by TTRfan
	When fuel is switched to the off position. NO fuel should leak right? (Preview) HI all, Chasing up a fuel leak. Have not had time to pull bits and pieces off the bike.... but. I have decided to run inline fuel filter crazy kid Put a brand new one (filter) on tonight, and noticed that even when fuel tap(peac o c k) was in the off position, fuel was coming out. I would not say, full flow, b...	z1g	3	1096	May 3, 2018 by z1g
	All balls Carb Rebuild (Preview) As I am always asking Bri to test kits that I have in the shop, thought I would have a go at fitting the all balls carb kit, as my carb needed a overhaul on my OE that I am going to do a full rebuild/ 350 kit on. So I started off stripping the carb down Now I think most people buy the kits, just to use all the gaskets O...	ttr steve	14	1003	Apr 30, 2018 by ttr steve
	Will a carb leak impact performance? (Preview) My carb has a leak from the diaphram area at the bottom of the carb so the diaphram is probably toast, I'll need to replace it. My question is will this issue have an effect on performance? I have no other TTR to compare mine to but if I had to guess I would say it's feeling underpowered.	Ether	4	884	Apr 30, 2018 by Ether
	TTR running rich on tickover (Preview) I have a carb that runs rich on tickover. Just touch the choke and its stalls immediately. I have set the float height artificially low - made no difference so it's not flooding. I have checked that the choke is seating properly so that's not the issue. I tried a smaller pilot jet and it made no difference...	TTRfan	4	1217	Apr 10, 2018 by TTRfan
	Lectron Gen II 4-stroke carburettor (Preview) https://www.lectronfuelsystems.com/index.php/street/four-stroke-carbs.html	TTRfan	4	2798	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	742	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	997	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	4527	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	5011	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	1304	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	612	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	11501	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	1456	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	34916	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	1660	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	983	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	2964	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	2362	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	1512	Dec 15, 2017 by JCW
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