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

DECYPHERX · DECYPHERX

So i just bought myself a 1999 ttr250 and everything works amazing, however the idle is high. I can fix this by giving it throttle real quick and letting off and then the idle goes down to normal. The cable doesnt seem to be sticking. Not entirely sure whats going on here. Theres a post on this forum that de...

yamaha42 · yamaha42

Hello all. I recently tore down my carb and cleaned it out because it had been sitting for a year and a half. I got it installed and put the bike back together, but when i turn on the pet****, gas comes out of both overflow lines. is it possible that i bent my floats?

NateGuy · NateGuy

Where can i find more detailed info on where everything goes when you're putting the bowl assembly of the carb back together?

NateGuy · NateGuy

My bike, after sitting for almost a year, would not get full power under full throttle First gear wasnt as noticable, but anything beyond that it seemed like it was choking on itself. Almost like a lope on a muscle car. I pulled the carb out, and I have a question about the accelerator pump thingy. Th...

650Katman · 650Katman

I found out why I had no tick over. Check out a previous owners handywork

mossproof · mossproof

Rebuilding a recently purchased used carb that was in quite a state and in checking the float bowl check valve (little top hat shaped brass thingy that seats into the bowl) found I couldn't blow air through it either way. Much soaking and prodding with a stick, then blowing the air line through it, and i...

Jesssss · Jesssss

Hi Guys Am trying to find factory settings for a TTR 250cc '95 OE carburetor Teikei Y30P?

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...

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

Topic		Started By	Replies	Views	Last Post
	Throttle sticking HELP (Preview) So i just bought myself a 1999 ttr250 and everything works amazing, however the idle is high. I can fix this by giving it throttle real quick and letting off and then the idle goes down to normal. The cable doesnt seem to be sticking. Not entirely sure whats going on here. Theres a post on this forum that de...	DECYPHERX	27	5157	Dec 31, 2019 by ttboof
	Carb issues ( 1 2 3 ) (Preview) Hello all. I recently tore down my carb and cleaned it out because it had been sitting for a year and a half. I got it installed and put the bike back together, but when i turn on the pet****, gas comes out of both overflow lines. is it possible that i bent my floats?	yamaha42	148	150723	Nov 27, 2019 by Blacknight
	More detail on rebuilding the carb? (Preview) Where can i find more detailed info on where everything goes when you're putting the bowl assembly of the carb back together?	NateGuy	6	1917	Nov 23, 2019 by NateGuy
	99 250 (Preview) My bike, after sitting for almost a year, would not get full power under full throttle First gear wasnt as noticable, but anything beyond that it seemed like it was choking on itself. Almost like a lope on a muscle car. I pulled the carb out, and I have a question about the accelerator pump thingy. Th...	NateGuy	4	1367	Nov 2, 2019 by TTRfan
	No idle. Pop and stop (Preview) I found out why I had no tick over. Check out a previous owners handywork	650Katman	5	1568	Jul 25, 2019 by ttr steve
	Float bowl check valve (Preview) Rebuilding a recently purchased used carb that was in quite a state and in checking the float bowl check valve (little top hat shaped brass thingy that seats into the bowl) found I couldn't blow air through it either way. Much soaking and prodding with a stick, then blowing the air line through it, and i...	mossproof	3	1753	Jul 21, 2019 by mossproof
	Factory Settings carb (Preview) Hi Guys Am trying to find factory settings for a TTR 250cc '95 OE carburetor Teikei Y30P?	Jesssss	1	2965	Jun 11, 2019 by mossproof
	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	1185	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	1227	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	1641	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	1571	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	1628	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	3054	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	1661	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	1919	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	2374	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	2077	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	2374	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	1746	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	1377	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	15178	Jun 12, 2018 by z1g
	Choke raises idle (Preview) dumb question but is the choke suposed to significantly raise the RPMs?	Rydasc6102	2	1610	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	1808	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	1553	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	34329	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	1505	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	1336	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	1247	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	1658	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	4605	Apr 6, 2018 by Base
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