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NEWBIE NEEDS HELP WITH CARB MODS....
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Hello all....just bought 2005 TTR250....I thought it was in good shape but have already found a couple of issues. At idle the engine pops and coughs backwards in direction of carb.....not noticeable while riding. Previous owner noted the bike had sat for a while so he had an auto mechanic friend cl...
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jpv7774
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9
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1353
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Jetting reccomendations, running rich
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My bike is running rich, as it splutters a lot on WOT. I have ran it with air box lid removed and it runs a lot better. Main jet is a 147, can anyone recommend what size main jet to change to? exhaust is a CRD open pipe. Is there a point changing pilot jet as it runs ok on low revs. Many thanks.
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ttr_paul
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17
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1617
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Jets For High Elevation
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Hey! I was wondering if anyone knew what jets (pilot and main) would work most efficient at 7000ft above sea level. I dropped the needle down two notches in the carb but it still sputters at high rpm and i can not get full power. Let me know your guys opinion!!
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KamJam
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9
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4578
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Carb pipe hole
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I noticed that I had a little petrol come out of this hole When I turned the fuel on. I had only just cleaned the carb it stopped after a few secs and hasn't done it since. as you sit on the bike this hole is on the right hand side of the carb on the bottom of the float bowl. I think it's for a pipe I didn't see a pipe o...
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TTRHead
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21
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1323
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Carb reconditioning
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Does anyone know of a good carburettor reconditioning company in the uk, has anyone used a specific company to carry out any work? I am thinking of getting mine reconditioned if it's possible. Cheers John
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jasparach
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0
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615
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Choke to Start
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Fairly New to riding every day but have to choke every morning for the bike to start. Any ideas or should i get used to this? tried changing plug but not sure the replacement was any better than the one that was in(hard to get genuine spares).
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shikufra
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2
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527
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Revving up
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Hello, I'm just learning how to take apart my carb on my TTR, as I cleaned the jets after it sat all winter. When I put it all back together and turned on the pet**** to fill the bowl, it started leaking out of the overflow. I figured the float was stuck so I tapped on it and it stopped leaking. Then when I st...
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Aron
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3
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643
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Hesitant just above idle.
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As above, my TTR starts and idles very well, i can even get it to idle very slowly and it ticks over lovely. But just above idle it seems slightly hesitant, this will be a pain when riding off road. Other than this it revs cleanly through the rev range as it should. Iv'e put the standard exhaust back on incas...
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locky
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41
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1955
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Suggested "carb fix"
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See here I found this when tidying up my file system. Very interesting. Any comments? Brian
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TTRfan
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1
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898
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choke knob
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does it stick out by about 20mm or does it sit back flush with the carb?
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widge
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4
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621
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Starting problems - any tips?
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The bike was standing for 18-months with fuel in, carb not drained. It would crank over but not run. So far I have done the following.. - Emptied old fuel in tank, filled up with a couple of litres of new fuel - Carb removed. Took apart from the float side only. Cleaned jets, diaphragm, bowl and float, an...
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DC
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10
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3222
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help how do i raise needle??
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looking too adjust my needle dose anyone know how?
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dannydandan
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0
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552
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Too rich mixture but will stall otherwise
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Hello guys, My bike is a 1996 Raid. A few days ago I had a fuel flow problem so today I cleaned the fuel tank and the carburetor. I found a huge amount of gunk clogging the fuel pipe and the needle valve seat, so I cleaned them out. But once I reassembled the bike, there was no way to get it start and run unless I o...
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TTRVN
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9
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1027
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Am I running lean?
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As far as I am aware, my TTR pulls like a train right through the rev range. Well, a small train. But there is a slight bog between 1/4 and 1/2 throttle, but only if held there for a sustained period, i.e. cruising down a long straight 30MPH road, then when you go to take off when the speed limit increases, a...
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Fladdem
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1
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1127
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air choke issues
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i have a problem...plz help.. my bike since day 1 wont start without pulling out the air choke stick (yep that one on carb) at least the very first time early in the morning that ill try to turn the bike on must pull the choke..after it gets hot everything is good and turns on ok...without air open needed....
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Serial
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2
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592
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Aftermarket fuel screw to fit these odd TTR carbs?
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I'm wondering if there's such a thing as an aftermarket fuel metering screw with a long shank on it to fit a TTR250. I can easily purchase one for my WR250f as it has a name brand carb. But what about the ttr? If so, do any of u guys know of a part number for one? Thanx.
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Terrence R
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3
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1080
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A bit of good carb info unless it's been posted before.
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My TTR runs sweet but i'm unsure if it should run a bit more crisp at lower revs, it could be normal for all i know and i'm happy with the way it runs. Saying this i think i'll give the carb another clean and check within the next few weeks. While searching for carb info i found this, i had to use google transla...
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locky
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3
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1347
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Idle speed screw.
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I could increase the idle speed easy enough. But slowing the idle was abit harder. Found that the spring was catching on the carby body. Took screw out then filed the top of the spring so it Had a slopping edge. Added a tiny bit of grease. Now its easily idled up or down. Use to have idle down with a pair...
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Markvan
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2
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1973
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Throttle jammed when riding in rain
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My OE runs fine in good weather condition but when riding in rain my throttle feels very sticky and when I let off the throttle grip, it jammed at about 1/4 carburetor opening thus I had to force it shut to an idle opening. However when I turned off the engine and twist the throttle open and close, it feels n...
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arip_rccar
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4
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1083
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Bike stalling ?
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I've looked through all the posts but can't find an answer. Sometimes the bike ran well then it just cuts out. Tbh it is a lot worse since the new pipe went on, as I'm not sure about carbs I don't know where to start. It also sounds like it's blowing back through the carb at times if that makes sense. Any help w...
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j180
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11
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1016
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Adjusting the needle circlip in the Carburettor.
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Hi Everyone I’ve ordered myself a GYTR Slip on muffler for my 2013 TTR250. I was told by the guys in at Yamaha to just drop the height of the circlip down “one” in the carburettor. I’m just wondering if anyone has any information on whether we can move the circlip down one with it all still attached to t...
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samuelttr
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2
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1237
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O2 Oxygen sensor as a means to measure fuel:air ratio DIY
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Hi all, I am home with the flu , so as usual to pass the time,laptop on my belly I started to google and gather information on my latest and hopefully helpful idea. we all know that a fuel/air metering device is expensive, yet it can give us much needed information on the mixture our motor is running on....
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Henry
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5
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1628
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Float pin direction
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hi all, sorry if I'm missing something but the ttr250 manual says to push float pin out in direction of arrow. Other advice on here seems to indicate that the arrow shows the direction the pin was installed in and that you push it out in opposite direction to arrow. Which is it please? Mine looks like so...
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Craiginuk
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1
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606
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Accelerator pump o-rings
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I need to replace the two leaking o-rings, part number appears to be 5Y1-14397-00 but judging by the price of the genuine Yamaha part they must be made of gold. Hence does anyone know their size so that I can pick up some replacements from the local suppliers?
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MarkJ
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3
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2036
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Belgian TTR carb setting issue
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Did a first testride today on my secondhand 2006 TTR.setup at purchase : Stock airfilter with airbox snorkelStock exhaust with restrictor removed50 pilot jet 147 main jet14 x 48 chainset After carb clean replaced all o-rings + diaphragm + checked acceleration pump (ok) Starts fine and revs ou...
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Spietfriek
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8
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1176
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Who's using what pilots?
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Just out of curiosity, I'm wondering what size pilot jets you guys are using in your ttr250's. I know that the 52 and 52.5 pilot jets seem to work good for a lot of people. Anyone using anything bigger? How about smaller? At what elevations? Any mods to justify?
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Terrence R
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15
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1373
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Revving up on her own
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Having trouble with my TTR again. I love her but sometimes I want to throw her to the scrap-man. After recently inadvertently putting diesel in the bike I have been having fuelling issues, I cleaned the fuel lines out, drained the tank and have cleaned the carb about 3 times. I can not see anything wro...
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Fladdem
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1
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1512
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Carb with slow running problem
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I have a carb that checked over fine. All jets cleaned or replaced, etc. However, there was an idle problem where on occasions the engine would run at a fast tickover and other times it would be OK. I know there is another post about these symptoms somewhere but darned if I can find it I took my own advice a...
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TTRfan
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12
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3712
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Carb tuning issues....help please!
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Hi I live in the pyrenees at 650m say 2000 feet or so.My 2004 ttr blue came with the carb box cut open, all snorkels etc. cut off and an after market exhaust, it never ran right. The previous owner had not re jetted. I changed the jets to run with the after market exhaust and it ran great but far too noisy for th...
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ianttr
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1
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2323
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Mid range acceleration issue
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Hi All, i have recently bought a used 1993 TTR 250. Purple frame. bike was abused, but engine was remarkably well maintained. no unwanted noises, etc. my problem is that when im riding and through the revs, low end, runs perfectly, WOT, runns pretty well too. but in between, like with the throttle ope...
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romeshs
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21
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2652
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