Question about 2003 Yamaha YZ 250

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98 timberwolf 250 2x sputters on accel and if sits for awhile leaks out overflow.carb has been rebuilt plug looks lean

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Overflow is from a bad needle and seat

Posted on Sep 08, 2009

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Yamaha Timberwolf. How do I find model number to order parts?


I apologize - my answer to the previous question didn't really clarify your actual question - Your VIN can be found along the frame rail - left hand side - about a foot or so ahead of your left foot guard -

26028714-jbdqfs5232kzbw0rj532ox50-2-0.png

If it's still there - your model number is here:26028714-jbdqfs5232kzbw0rj532ox50-2-2.png

If you can read your VIN - and here's a tip to know you're getting the whole number and it's not rusted away a digit; your second digit should be a (Y) - if you write down your VIN, second digit is Y so you know the placement is right - the 10th digit is the year. And here are the breakdowns for that 10th Digit:

(For all Yamahas - not just the Timberwolf):
88 - J, 89 - K, 90 - L, 91 - M, 92 - N, 93 - P, 94 - R, 95 - S, 96 - T, 97 - V, 98 - W, 99 - X, 2000 - Y, 01 - 1, 02 - 2, 03 - 3

From 1992 - 1998 the Yamaha 250 4-stroke, shaft drive, trail bike was the Timberwolf.

From 1999 - 2004 the Yamaha 250 4-stroke, shaft drive, trail bike was the Bear Tracker.

*****SAME ENGINE, SAME TRANSMISSION, SAME REAR END, TIRE SIZE, PULL START - THINGS THEY DEFINITELY CHANGED IN 1999 WHEN THEY STARTED CALLING THEM THE BEAR TRACKER: - PLASTICS BECAME A LITTLE LONGER I BELIEVE; AND THE SEAT WITHOUT A DOUBT BECAME LONGER. THE CARB WENT TO A CONSTANT VACUUM - INSTEAD OF THE SLIDE CARB WHERE THE THROTTLE CABLE WENT THROUGH THE CAP LIKE THE TIMBERWOLF. HARD TO REMEMBER - BUT I THINK THE TIMING CHAIN TENSIONER BECAME UNADJUSTABLE - AND NOT MUCH ELSE CHANGED. IN 99 THEY EVEN KEPT THE BRAKING SYSTEM THE SAME. SOMETIME AROUND 2000, 01 OR SO THE BRAKE SYSTEM CHANGED FOR THE FRONT WHEN YAMAHA WENT TO DISC BRAKES. HOPE THIS HELPS. ANYTHING ELSE YOU NEED TO KNOW ABOUT YOUR TIMBERWOLF JUST LET ME KNOW - I'VE OWNED, REBUILT, BOUGHT, SOLD, TRADED A TON - I'VE CURRENTLY GOT A 99 BEAR TRACKER THAT IS THE MOST DEPENDABLE 250 4 STROKE I'VE EVER OWNED AND A 1996 YAMAHA WOLVERINE 350 4X4 - I'VE REBUILT THEM FROM THE BOTTOM TO THE TOP. THOSE BIKES ARE GOLDEN IF YOU TAKE CARE OF THEM AND DO A LITTLE ROUTINE MAINTENANCE. ALL THE BEST - JUSTIN MCCARTNEY

THE 99 I MENTIONED THAT I STILL HAVE:
26028714-jbdqfs5232kzbw0rj532ox50-2-5.jpg

A 98 I BOUGHT WITH THE ENGINE IN A MILK CRATE THAT I BOUGHT, REBUILT & SOLD:
26028714-jbdqfs5232kzbw0rj532ox50-2-9.png

A 2004 I BOUGHT, REBUILT AND SOLD:
26028714-jbdqfs5232kzbw0rj532ox50-2-14.jpg
All the best - let me know if you're ever in a jam with yours; not too much I haven't seen, fixed or had to deal with.

Dec 29, 2015 | ATVs

1 Answer

High idle problems,revs,dosn't decel


Presume you turned the idle adjuster down ? . It sounds like theres an air leak , most likely between the carb and the head .is the inlet manifold cracked or loose ?

Mar 13, 2014 | Yamaha Motorcycles

3 Answers

Boggy starting off, runs great at hwy speeds, runs on slightly after a long run, smells bad when shut down and smell fuel when shuts down sometimes. Seams to have started after using premium fuel. had...


Could still have a carb problem. Have you changed the fuel filter? That is always the first thing to do. Running on could also indicate a timing problem. How about the timing belts? have the been looked at lately? They may be stretch a bit or loose. Should not have to use premium in a Goldwing.

Aug 26, 2013 | 1993 Honda GL 1500 Aspencade Gold Wing

1 Answer

Bike spits and sputters at top end


Hi, Johnny and the usual suspects are:
1. Inlet system air leak.
2. Enrichener valve not seated or leaking.
3. Damaged or restricted fuel tank vent system.
4. Restricted fuel supply tract.
5. Dirty or damaged air cleaner element.
6. Plugged bowl vent or overflow.
7. Worn or damaged needle or needle jet.
8. Vacuum piston assembly malfunction.
9. Loose or plugged main jets or passages.
10. Improper float level.
11. Accelerator pumps inoperative.
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.
Testing the Power Valve Yamaha 2 Stroke
05 yz125 sputter at high rpm Yamaha 2 Stroke
YAMAHA YZ250 LC Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Dec 17, 2012 | 2003 Yamaha YZ 250

1 Answer

1987 subaru carburator problems


You need to hone the accelerator pump well and adjust the throw of the pump rod as much as possible to get more fuel. Of course that is just a guess based on 100's of rebuilds i have done over the years. I have also found that Japanese carbs seldom turn out when rebuilt.

Nov 05, 2012 | 1987 Subaru Gl 4WD

1 Answer

Have an 87montycarlo ss when i take off carb stumbles alittle bit carb rebuilt twice i figured it was accelator pump but they did the pump twice if i send it back agan i dont think they wil resolve the...


Other things such as ignition timing, vacuum leaks, intake manifold vacuum leaks will also cuase the engine to falter. Sometimes the carburetor cannot be overhauled because the metal parts have become corroded. Hesitation can also be caused by a lean mixture. Hope this helps, DT

Mar 11, 2011 | 1987 Chevrolet Monte Carlo

1 Answer

91 fzr 600, it will spit and sputter and barely go, and then it will clear out and take off like a rocket, and then it will start sputtering again. over and over


how long has the bike sat? it sounds like your haven a fuel problem. i would start with the simple first fuel filter, fuel lines, vac. lines and intake boots. If you have a vac. leak it could cause it run funky. Check your spark and spark plugs, plug wires and boots. if you haven't found the problem yet you should look into your carbs, you could have trash from your fuel filter or gas tank if your lines are old they could have started to brake apart. If your ride has been sitting for awhile you could be facing clogged jets. I don't know how you are with taken things apart and putting it back together with no left over parts, but i will say that the carbs have A LOT of small parts. If you don't have any luck with simple check list and would to take a look into your carbs ill be more then happy to help.
Good like
Mark Woodring

Jan 23, 2011 | 1991 Yamaha FZR 600

1 Answer

85 ford F-150 5.8 carb was rebuilt and ran awsome


CARBURETOR FLOATS SETTING TOO LOW OR MIXTURE SCREWS SET TOO LEAN NEED ADJUSTING.

Mar 20, 2010 | 1985 Ford F150

1 Answer

My 84 f350 is having fuel and air problem. It ran fair but it would backfire when i let off the accelator,so I had the carb rebuilt that made the backfiring worse. So now I have replaced the carb mounting...


It seems that you have a vaccuum leak around the intake or carb, Check all hoses for good connections. You can spray carb. and choke cleaner around the intake and carb whole it is running and if the engine rise and lowers. you have a leak

Dec 10, 2009 | Ford F-350 Cars & Trucks

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