Question about 2004 Yamaha YZ 450 F

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2005 yamaha yzf 250-unstable idle

Bought bike used, not ridden much, could not get to idle, suspected problem in carb pilot jet, took apart and cleaned carb, pilot was plugged, cleaned carb with spray cleaner, got flow through every port we could find. bike now idles ok sometimes, then sometimes revs higher, like on a fast idle. bike backfires, acts like running lean. messed with pilot jet adjustment, got to run a little better, but something still aint right. got carb pulled back apart now. ideas?

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  • gorgev Apr 25, 2009

    Hey
    I have the same problem. Did the previous post helped?
    Thanks

  • Anonymous Mar 28, 2014

    I am getting fire but the plug is dry I have gas pouring out the overflow on the carb. the bike wont start even when I try to drift start

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I had the same problem, Turns out that my shims were finished, replace the chims and check clearences.

Posted on Mar 12, 2009

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Hi, Anonymous for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Yamaha, despair not, for a mere $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
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Hi, Anonymous and the usual suspects are:
1. Idle circuit and transfer ports clogged.
2. Air fuel mixture adjustment too lean.
3. Pilot jet clogged.
4. Faulty accelerator pump.
5. Float level too low.
6. Float bowl contaminated old fuel, water, dirt, rust, etc.
7. Float bowl vent or overflow tube clogged.
8. Fuel flow to carburetor restricted.
9. Intake manifold leak.
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Problems with stalling at low speeds and not idling well


Hi, Jonathan and the usual suspects are:
1. Idle circuit and transfer ports clogged.
2. Air fuel mixture adjustment too lean.
3. Pilot jet clogged.
4. Faulty accelerator pump.
5. Float level too low.
6. Float bowl contaminated old fuel, water, dirt, rust, etc.
7. Float bowl vent or overflow tube clogged.
8. Fuel flow to carburetor restricted.
9. Intake manifold leak.
10. The gas cap is not venting properly or fuel tank venting system blocked.
11. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
12. Needle and seat stuck closed in the float bowl.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
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Just bought it yesterday, my tzr 250 was going sweet today it wont idle. its all good if i hold it at about 2500 rpm any lower and it dies. also when i put it in 1st and try to take off it sounds as if...


When a bike sits the first thing to check is the pilot jet. It has the smallest hole and clogs the easiest. When it clogs you lose idle. Open the carb and look for a small hole next to the main jet, the pilot sits up inside. You need a narrow screwdriver to get up in there. Be sure you have a good fit so as not to strip the soft brass jet. I use a guitar string of the right diameter to clean out the hole. The varnish can be very hard, get it back to brass without removing metal is tricky. Squirt cleaner up into hole where the pilot goes with jet out. It should squirt through into carb air passage. Check float and float needle for cleanliness and smooth movment.Reassemble and try again. Good luck.

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1 Answer

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The TTR-125 Carburetor's Run Lean by design. Mine had the same issues till I found a post on Thumpertalk.com on Carb and air box Mod. This is a good starting point on gets; 110 and 112.5 main and 17.5 pilot. But you must check spark plug coloring to make sure the jetting is correct. Check spark plug after the bike has been ridden for a wile. I also took out the stock baffle and replaced it with exhaust tip and now it fires up after a few kicks and worms up in a few minutes.

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1 Answer

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You need to take your bike to a shop and have them do a carb synch, Possible carb clean. You might have partially clogged pilot jets, or idle jets. Chaz Moto DC

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1 Answer

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How long has the bike been sitting?? From what your saying i would start with cleaning the carb. as gas sits it will gum up and block you jets. the carb in bike and most bike have 2 jets pilot and main the pilot the is idle jet and is hooked into the air/fuel screw. it is the smallest of the jets that pick up gas. when you have your choke on it lets the gas " bypass the pilot and feeds gas to the motor when you turn it off it is all up to the pilot jet and if it is gummed up your bike will not idle.
http://fiche.worldofpowersports.com/wps/Yamaha_OEM/YamahaMC.asp?Type=13&A=508&B=9
Take a look at the microfishe if it looks to much for you i would take it to you local shop
Mark
C.C. Motorsports

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2 Answers

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Hi,
Your plugs are probably dripping with an unburnt gas mixture/residue if you've ridden the bike any serious distance with the choke on.

Change your plugs, don't just clean them, Change Them...

Check your idle jet in your carb. Clean it, carefully.

Good Luck and Let me know...

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