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

widge · widge

Hi, I fitted the jets from the all balls kit, however the bike is running rough. it accelerates ok but pops through the silencer, on steady throttle it hesitates but no prblem starting. it takes a bit of time sometime for the tickover to settle down. Rob

widge · widge

Ok I messed up! Somehow I managed to damage the thread in the float bowl for the drain screw. I must have put it in cross threaded. I the drain screw itself is damaged but more worryingly is the thread inside the bowl. Any suggestion what to do? Rob

Firestorm809 · Firestorm809

Hoping for some help...again 🙄.I have stripped the carb down to give a deep clean and found there is no baffle plate in the float end. Will this cause me issues and are they available to purchase? Also any idea when carb service kits will be back in stock? Thanks in advance Matthew

widge · widge

I went to start the bike after some time of it just sitting there. pulled out the choke and it fired up and reved like mad. pushed in the choke and it died. Tried it again and twisted the throttle stop to slow it down. Now will not start at all. I have got the carb off but before I take it to pieces anything...

IanU · IanU

My Carb inlet has a white plug in it, is this normal or has something been removed from the inlet?

TTRfan · TTRfan

More mumbling - sorry! Also the video is over quarter of an hour so not an entertaining one! Have a laugh at my expense when I dropped can of petrol Brian

tom13 · tom13

Google translator. I think it's a carburetor. After being tipped to the left (I have not topped the right one yet) I can not run the foot of the engine. I do not have an electric starter. It is only after about 15-20 minutes that the motor can be started. Such a mystery. What is going on? Thank you.

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...

mossproof · mossproof

Found this article whilst pondering carb options for the 350 (sorry guys, still twiddling my thumbs waiting for Woessner to get their act together...) Contains a post from a certain TTRFAN. That you Brian? Does anyone have any further info? Think this TM33 pumper carb can be used on the DR350, whi...

Rydasc6102 · Rydasc6102

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

OkieRider · OkieRider

Hey all. New to the forum. I posted this over on Thumper Talk, and got no response, so I decided to make an account here. Its a 2005 US model. I got the bike last year. I did the basic stuff, took the baffle out of the pipe, rejetted, took the snorkel off of airbox, etc. That's when my problems started... ...

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...

Topic		Started By	Replies	Views	Last Post
	all balls jets (Preview) Hi, I fitted the jets from the all balls kit, however the bike is running rough. it accelerates ok but pops through the silencer, on steady throttle it hesitates but no prblem starting. it takes a bit of time sometime for the tickover to settle down. Rob	widge	5	429	Jun 5, 2019 by ttr steve
	damaged thread (Preview) Ok I messed up! Somehow I managed to damage the thread in the float bowl for the drain screw. I must have put it in cross threaded. I the drain screw itself is damaged but more worryingly is the thread inside the bowl. Any suggestion what to do? Rob	widge	9	476	May 3, 2019 by mossproof
	Carb Baffle Plate (Preview) Hoping for some help...again 🙄.I have stripped the carb down to give a deep clean and found there is no baffle plate in the float end. Will this cause me issues and are they available to purchase? Also any idea when carb service kits will be back in stock? Thanks in advance Matthew	Firestorm809	3	409	Apr 27, 2019 by Firestorm809
	More carb woes (Preview) I went to start the bike after some time of it just sitting there. pulled out the choke and it fired up and reved like mad. pushed in the choke and it died. Tried it again and twisted the throttle stop to slow it down. Now will not start at all. I have got the carb off but before I take it to pieces anything...	widge	6	534	Apr 7, 2019 by TTRfan
	Carb inlet ‘plug’ (Preview) My Carb inlet has a white plug in it, is this normal or has something been removed from the inlet?	IanU	3	423	Apr 1, 2019 by Kaos
	A "Fitting the carb" video tutorial (Preview) More mumbling - sorry! Also the video is over quarter of an hour so not an entertaining one! Have a laugh at my expense when I dropped can of petrol Brian	TTRfan	6	980	Jan 17, 2019 by tripodtiger
	Do not start after tipover (Preview) Google translator. I think it's a carburetor. After being tipped to the left (I have not topped the right one yet) I can not run the foot of the engine. I do not have an electric starter. It is only after about 15-20 minutes that the motor can be started. Such a mystery. What is going on? Thank you.	tom13	9	843	Oct 31, 2018 by tom13
	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	902	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	1322	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	1069	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	785	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	805	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	602	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	9557	Jun 12, 2018 by z1g
	Mikuni pumper carbs (Preview) Found this article whilst pondering carb options for the 350 (sorry guys, still twiddling my thumbs waiting for Woessner to get their act together...) Contains a post from a certain TTRFAN. That you Brian? Does anyone have any further info? Think this TM33 pumper carb can be used on the DR350, whi...	mossproof	10	1422	Jun 4, 2018 by leigh
	Choke raises idle (Preview) dumb question but is the choke suposed to significantly raise the RPMs?	Rydasc6102	2	566	May 22, 2018 by ttboof
	High or sticking idle?? (Preview) Hey all. New to the forum. I posted this over on Thumper Talk, and got no response, so I decided to make an account here. Its a 2005 US model. I got the bike last year. I did the basic stuff, took the baffle out of the pipe, rejetted, took the snorkel off of airbox, etc. That's when my problems started... ...	OkieRider	46	3663	May 22, 2018 by z1g
	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	842	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	631	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	15018	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	619	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	714	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	554	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	772	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	1241	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	453	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	663	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	2559	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	2537	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	795	Jan 31, 2018 by ttboof
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