Question about 2003 Yamaha YZ 125

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2001 yz125 exhaust

I just bought this bike and trying to replace the exhaust pipe. I have ordered 2 pipes FMF stock and gold series and they both have come with a female fitting to the cylinder head. The pipe installed now has a female end that extends into the cylinder head to seal. I don't if this head has been replaced or not, but there is no sign that the extension part that would allow these new pipes to install has been removed or modified. Is there a stub pipe to allow installation of these new pipes? Is there a different pipe that would fit?

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If you have any friends that weld. ive had this problem myself and have found it cheaper and less stressful to fabricate yourself than to search any further

Posted on May 11, 2009

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Posted on Jan 02, 2017

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Just bought a 2001 WR 426. Has an FMF pipe, no air box lid. Main is a #165 and pilot is a #42.these are stock jets according to shop manual. My elevation is 2500-3000 Ft. Any ideas on jetting?


Hard to give accurate info with out seeing the bike with jetting but I would suggest take a reading from the fuel air screw if the bike running better with the fuel air screw in carbi at 2.5 turns out or more then definitely increase pilot jet up 1 or 2 sizes if you get the bike to run well between one - two turns out on the fuel air screw that is where your jetting should be
I wouldn't be concerned with main jet at all - it should be fine for wide open throttle unless you feeling power loss when you open it right up
also if you are getting backfire or popping when de accelleration that also hints toward lean pilot so a size or two change in pilot jet would be worth trying

Jan 20, 2011 | 2001 Yamaha WR 426 F

1 Answer

My honda shadow sabre the pipes trun blue


Motorcycles come standard with double wall pipes. The inner pipe turns blue and the outer chrome pipe stays nice. In a stock exhaust system you rarely get blued pipes. Unless, you put on your choke, start your bike, answer the phone, and forget your bike is running (or you start driving and just forget to turn off your choke.). Then you will blue your double wall pipe. Bluing is generally caused by too rich of a mixture or fuel burning in the exhaust pipe. If you put on an aftermarket pipe(usually single wall construction) and did not coat the inside of the muffler pipe, the pipe will generally blue the first time you drive the cycle. An old dealer trick is to replace blued aftermarket pipes with new aftermarket pipes (makes the bike look great on the showroom floor). Again if they don't coat the inside of the pipe with exhaust paint or a special coatings usually about $35 the pipes will blue before the customer gets home. If the bluing is mild you could try a product called" Blue Away"that might help, but should not be used regularly as it takes off a little bit of the chrome each time.

Jun 06, 2010 | 2001 Honda VT 1100 C2 Shadow Sabre

1 Answer

Glowing RED exhaust pipe


try a bigger jet or its going to cause some damage. You can pull the choke on to get some more fuel in to cool it .
Check that the cam timing hasnt been played with, some change the exaust cam by a tooth to copy yz specs, on top dead centre, there is a little arrow on each cam that lines up with the rocker cover surface

Mar 09, 2010 | 2003 Yamaha WR 450 F

1 Answer

Best silencer for a 2 stroke rm250


you can drop decibles on your stock silencer, by wraping it with hight temp exhast wrap from the automotive performance industry.

Oct 30, 2009 | 2004 Suzuki RM 250

3 Answers

Exssive oil from tail pipe yz 125


Hi, when you change your pipe to the FMF you reduced the back pressure and gave it more flow. That causes it to run a little "rich". Look at your spark plug and check the color of it, it should be a nice tan color. If its a dark brown then you need to "lean" out your bike. The easiest way to do that is by taking the slide out of the carb and taking out the main jet, the lock washer is set to the middle position for a stock set-up. Move it down 2 notches and then run it and see what your plug looks like. The black "goo" is the unburned oil from not running lean enough. Another trick to try is run a NGK-EV plug. it burns hotter so it will help with the oil problem (and make it a little more snappy also). And as an added bonus it will be easier to start.

Aug 21, 2009 | 2003 Yamaha YZ 250

3 Answers

1995 YZ125 Powerband isn't as long as it used to be.


thier is no power band on a motor cycle thier are reed values and a power valve sounds like the reed valve need to be replaced.

Aug 17, 2009 | 2003 Yamaha YZ 125

1 Answer

Just looking for general advice...on FMF Pipe Install


i changed my pipe on 07 dt125lc and did not rejet, seemed fine until i holed a piston. best to rejet me thinks, about £20 instead of £150 for piston rebore bearings and jets plus the time to re build.

Apr 25, 2009 | 2003 Yamaha YZ 125

2 Answers

Oil out of tail pipe


Hi,
This is not uncommon.
Things to check first would be your fuel mixture. You might be running a bit rich. You should be using a mix of 3.5 percent synthetic oil.
Being a 2 stroke, the tail pipe cartridge needs replacing from time to time, as it does collect oil with time. If the bike is a bit noisey change the packing.
Always remember that there is oil in fuel used on 2 strokes.
Lastly check the type of oil you are using. Mineral oil does tend to be a bit messy as the mixture requires around 5 percent oil.
Most off road stores now keep good LOW SMOKE oils such as Motrex.
Stick to good synthetic oils !
Cheers
Jon

Feb 16, 2009 | 2003 Yamaha YZ 250

1 Answer

Installing an exhaust


but I was curious if I need some sort of rubber seal or a sealing compound for it. Thanks a lot!No you dont absolutly need it but it would be smart to have because I had the same thing happen on my yz125 and the carbon went everywhere and staind my swingarm. I just used a piece of old radiator tube because it was cheap and I didn't have to order it.,

Nov 10, 2008 | 2005 KTM EXC 125

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