Question about 2002 Yamaha TT-R 250

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I have a 2004 TTR250 and it has a flat spot. Carb is clean, low mileage, no air leaks, have increased pilot jet to recommended spec. Still no change. Decorked the exhaust with a slight expectation that it may get worse. It goes really well and had no other issues. It just won't cruise due to surging and and a flat spot when opened out. Any ideas would be great. Regards

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Might be an idea to check and or replace air filter, check flaps/seat base or a guard is not obstructing airbox intake mouth. Take note of the stock plug numbers/letters and get a replacement Iridium Power type plug for it. (should be DENSO or equivelent, IU27 with 0.7mm gap). They are 2-3 times more expensive, but more than worth it. I run them in my Suzi DR650RS duallie and my Yammy IT250J Enduro. Cheers

Posted on Apr 29, 2010

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While riding bike started to sputter and turned off. sounds like it was not getting gas. Starts fine when choked but eventually sounds like it is starving for fuel, sputters and then turns off


Barring any obvious vaccuum leaks,sounds like the pilot jet may be clogged. Try increasing the engine RPM and at the same time opening the choke. If it will run fine past 1/2 to 3/4 throttle that is a good place to start. If you are comfortable with dropping the float bowl it is a fairly easy process. Usually there is a screw at the bottom of the carb ( flat blade ) that will drain the bowl with the fuel **** closed. Remove the screwsthat hold the bowl in place and carefully lower past the float. The pilot jet is the smaller one offset from center. remove the jet with a flat blade screwdriver and clean with solvent and compressed air. While your in there go ahead and clean and inspect the rest of the exposed parts just be careful not to knock the float and needle around.

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My 2005 yz250f will not idle and backfires on decel. i have cleaned carb and all jets even replaced pilot jet. I tried turning the fuel screw in and out slowly with no positive result.


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Yamaha xs 650 I am having problems with flat spots during acceleration. I tried new spark plugs, but have not gotten any results. I believe it is an improper jet setting. I live in kansas city and need...


Hello unless some one has changed the jets the original jets are standard the thing to do i suggest first check for intake leaks at the carb joints between the head and carbs run the bike and use WD40 spray arounf the joints if the rpm's change you have a intake leak.
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I have a 1994 Yamaha TTR250, bike was running fine but all of a sudden developed a misfire. Engine will start but misfires and will not get full revs. When I open the throttle the revs try and increase but...


sounds like you did everything you could but it does sound like there's only one option left and that's the CDI
good going i"d like a response feedback on this if you got time,,,thanks.

Oct 04, 2009 | 2002 Yamaha TT-R 250

1 Answer

Yz 150f bogs when you give full throttle all at once


ok, assuming you replaced the carb header and stator with aftermarket parts, then I would say you definitely have a jetting issue. that flat spot is coming from your engine starving for fuel. its taking the gas too long to get from the carb to the engine. you would fix this by adjusting the idle mixture on the carb. the first thing I would do is look for the fuel mixture screw on the carb. im not familiar with your specific model. but the screw is usually found facing down on the bottom of the carb, directly in front of the bowl. when you find it, turn it counter clockwise about 1/2 turn at a time until that flat spot fades away. if that doesnt work, then you will need to up the size of the pilot jet inside the carb. maybe 1 or 2 sizes would be enough. if you replaced the carb with a bigger carb, then you may not be able to fix this problem. in my experience, larger carbs will increase power, but usually throttle response, especially low end, suffers considerably. the reason for this is lower intake velocity and vacuum. basically, with a bigger carb it takes a second longer for the fuel to be drawn from the carb and properly atomize with the air. hope this helps.if I overlooked anything let me know! some more info on the engine/modifications and carb/jet sizes would help too. good luck.

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this will depend on what gas oil mixture you have

check this topic out.

http://www.dirtrider.net/forums3/showthread.php?threadid=117838

http://forums.dirtrider.com/70/7640379/yamaha-dirt-bikes/yz125-carb-settings/index.html

regards,

voodoo

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1 Answer

Klx 110 2006 stalls when choke is pushed in


i'd say the carb is gummed up especially the pilot jet (#16158) in this pic of the USA carb. may have to remove the carb & bowl and then remove the pilot jet (w/ flat head screw driver) and clean out the tiny holes.

http://partsfinder.onlinemicrofiche.com/atlanticcycleandpower/Kawasaki_OEM/KawasakiDB.asp?Type=18&A=39&B=17&Action=O

-OR-

the carb slide is installed backwards (turned 180 degrees). its #16025 in the pic. i've done this before on my daughter's XR70 and Z50. you'll know if its this when you move the choke lever, RPMs increase and decrease.

hope this worked for you and was fast enough.

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