Yamaha

When my bike warms up it misfires and looses power!

I've cleaned the carb, new plugs and caps,cdi unit, I've had an energise rebuild and it's still happening? 

I have a 2005 yz125, it runs great up hill or on the flat, but as soon as i start going down hill it starts fouling plugs.  Im thinking it might be the float height but didn't know if anyone had any other suggestions. 

Does anyone know off place to get hd valve springs for ttr125 w BBR big bore 150 kit w cam? Do i even need them? Bike is my sons hard play bike.How about porting & polishing?

I have my 2001 yz 125 and it wont start, it started doing this recently, but when it first did it i just cleaned my spark plug and it worked, went out for a ride for a couple of hours and it bogged out on me before getting home, i tried to start it and it wouldnt start, i cleaned out the spark plug, i checked if it had spark, and it did, when i kicked it, it turned on but bogged out right after, i dont know what might be wrong, any help would be greatly appreciated. Thanks in advance.

Please can I get advise on what bike I should purchase my son. He is 8 yrs old and very tall for his age.

He has been riding his Yamaha PW80 since he was 5 yrs old and now needs a larger bike due to his height.

I called a Yamaha dealer who explained my next step up is a 125 , this is a very large and powerfull bike which is a concern.

for me as I dont want the power but need a bigger bike. Is there a taller bike which is not as powerfull as the 125?

Does not have to be a Yamaha?

Thanks

Tracy

I just bought a 2003 yz 125, from a friend today.  I knew it did not start but for $850 i wasnt going to turn it down.  So, i took the carb apart and cleaned it. Still didnt start, so i put a new spark plug in. Still didnt start, so i did a compression test, and i found that i have more than enough compression.  The motor has 2 hours on it, and the gas in it was 32:1.  

I just bought a bike from a kid to help him get his truck on the road. He said its a TTR125 but the vin says its a 2005 CE12Y and was built in barizil. Another sight said its a TTR 125 LW. So can anyone help me so i can get parts for this bike so i can go riding asap. I called Yamaha and they have no clue lmao. PLEASE ANYONE with any info that might help. Thank you Kandi

Hey,

i was wondering if any of you know what jetting is needed for a wr250f 2010 for a 2010 yz250f slip on exhaust 

Thanks

Ok so i decided to put money into my wr. I go trail riding mostly and plan on training for enduro's and going to go and do barstow to vegas. So far i bought the bike from a guy who put a fmf q exhaust and pipe with some misc bolt on stuff, it isnt jeted properly right now main jet wise but runs great still.

What i want to do so far is a big bore to a 290 and a set of intake and exhaust hotcams stage 1. Also i plan to get a yz throttle stop. I need to know what jet sizes i need. Also ive heard contreversal views on the gray wire mod on the 2003 model, any views on it?

Back in '05 I mounted Baja designs on my '06 Wr250 in order to get it plated and street legal to

compete in long 2 day enduros. Now in 2012, I love the bike maintain it well... and have modified it a lot

in order to get the racey, snappy feel of a YZ, but 4 stroke Wide Ratio (WR) need... in the past week I

took off all Baja designs electrical wiring, replaced spark plug removed battery, cleaned carb. It's much lighter however,