Question about 2004 Yamaha YZ 125

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04 yamaha yz125 when I start bike it revs flat out, checked carby &; looks ok

Checked carby & reed valves & they look ok

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Hi, check the throttle slide is at the bottom with just a small gap, if its higher, check your throttle cable, if they are ok you might have some dirt in the jets, youneed to clean the the inside bottom of the carb and blow the jets out with an air line. good luck.

Posted on Nov 26, 2014

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  • 7 Answers

Check for a vacuum leak i.e. carb base gasket and other hoses

Posted on Nov 26, 2014

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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SOURCE: yamaha yz125 wont start...

hello there guys, listen a top tip is when the engine's cold tip the bike almost right on its side nearly touching the floof, wait for the petrol to poor out of the carb over flow pipe, this should take a matter of a few seconds, stand the bike back up again and kick and that baby should start right up, if it does then you have a problem with your float, if it still doesn,t then take it to a shop and get them to check it out, hope this helps. regards sam

Posted on Jan 24, 2009

unclefot
  • 1 Answer

SOURCE: How to check my oil level on 04 Yamaha yzf 600

YZF600R is a carbureted model. OIL: The oil sight glass is a round window, low on the right side. Very hard to try to see when astride the bike, even if you use a mirror on an extension rod. Have a friend hold the bike level,perhaps, while you check. Oil should be sighted after the bike has been sitting for a time after riding. I suggest using a good 10W-40 regular motorcycle oil (Least expensive around here in Boston is to buy Kawasaki by the gallon at Riverside) I found the pesky 1st-to-2nd shift to be more direct with this oil than with synthetic. I had plenty of opportunity to compare the two types. GAS: No reserve, but as noted, there is a low fuel light, in the row of lights that includes the neutral light and the high beam indicator. You ought to be getting over 50 m.p.g., so you can estimate your 'range' from that. I usually fill up again around the 180 mile period. I think I've seen the low fuel light once in 6 years of ownership. OH: I suggest you treat the gas, on a regular basis, with 'marine' Stabil, not the regular stuff. I have had a 'gummy' Yamaha Virago 250 to care for, that I thought would never clear its fuel problems. Last winter ('08-'09) stored it with the marine Stabil in the tank and run for a while to get it into the carbs also. Within a few minutes of running it this spring-actually a couple weeks ago- it smoothed out and has run fine since. I believe this HAS to be as a result of the treatment of the fuel (run through the carbs before the winter storage) with this special Stabil. It was recommended by Carlo at Riverside- I'll have to remember to thank him for the advice. N.B. I always change the fuel (siphon it out, put that Stabil'ed but 'old' stuff into my car tank, refill the bikes with fresh 93 octane) each Spring.

Posted on Aug 17, 2009

  • 1 Answer

SOURCE: 2002 YAMAHA BANSHEE WILL NOT REV

I have a 2004 banshee at the yamaha dealer being worked on.It would not run when i took it up there they cleaned the carbs and put it back together it will start but when you rev it, it holds itself wide open and wont shut down unless you pull the plug wires.they also checked the floats in the carbs said they where ok. they think it is a vent issue with the gas tank or the fuel shut off valve.IS THAT POSSIBLE

Posted on Aug 27, 2009

mxtras
  • 194 Answers

SOURCE: power valve position and installation for yz 125

The proper adjustment is achieved when the notch in the actuator lines up with the pin hole in the cylinder casting.

Posted on Nov 13, 2009

  • 3 Answers

SOURCE: i have 1974 yamaha dt 250 enduro the bike sat

clean contacts on points with sandpaper (800 grit). located behind flywheel, will gurantee a fix. you can remove the side cover and get to contacts through holes in flywheel without removing it.

Posted on Nov 16, 2009

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1 Answer

I've stripped the reed valve on my yz125 (1999) and discovered the carb joint has been sawn flat ( the lugs have been sawn off)


Im.not sure what part you are saying has been sawn off. Reed blocks have. V shape inside them which have a set of petals on each face.the bike not run without these as it needs pre compression of the crank case to force the new fuel air mixture.up the transfer ports and push the burnt gases out.

Mar 06, 2015 | Yamaha Motorcycles

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When I start bike it rev flat out


Idle adjustment, throttle cable, vacuum leak, carburetor. THOROUGHLY CHECK them all

Nov 26, 2014 | 2004 Yamaha YZ 125

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Bike was running great on saturday. Went to the races bike started right up when the gate dropped bike won't rev out all the way. Didn't have this problem yesterday. When we got home i cleaned the car


Hi, Anonymous and the usual suspects are:
1. Severely drained or faulty battery.
2. Faulty regulator/rectifier or high output coil.
3. Faulty power valve, solenoid or installation.
4. Clogged air filter or exhaust.
5. Cracked or incorrect float level.
6. Float needle is not seating.
7. Faulty reed valve.
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.
YZ250 electrical issue won rev up
YZ250 bad reed Yamaha 2 Stroke
YAMAHA YZ250 LC Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

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I put a new piston into my 94 Yamaha yz125 dirt bike and when i tried to start it has low compressions


I had a similar problem check to make sure the rings line up right and if that dosent work let me know

Jan 02, 2013 | Boyesen Yamaha Yz125 Rad Valve Yz 125 1994

1 Answer

My 1998 yz 125 loses power in first and second then bogs and cuts out? what should i do?


Hi, Gareth and the usual suspects are:
1. Severely drained or faulty battery.
2. Faulty regulator/rectifier or high output coil.
3. Faulty power valve, solenoid or installation.
4. Clogged air filter or exhaust.
5. Cracked or incorrect float level.
6. Float needle is not seating.
7. Faulty reed valve.
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.
UPDATED 2005 YZ125 bog issue with videos
Dirt Rider Magazine
YAMAHA YZ125 Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Oct 15, 2012 | Yamaha YZ 125 Motorcycles

1 Answer

Small pinholes in the reed valves


Yes mate... It is hard to say without seeing the reed valve but I guaranty a dodgy reed valve will make running and tuning the bike a nightmare. Your reeds need to seal perfectly and open and close about 2-3 times a second so if any cracks, holes or damage to them then they will never seal correctly which will allow blow back through the carbi and incorrect air and fuel mix to be sucked into the motor. best solution buy a V force reed kit it replaces the entire cage and reeds just bolts in (4 bolts) I sell them for about $160 delivered, or if your know what you are doing then you can just replace the reed petals with new... About $60 ishwww.motoxpartsonline.com

Feb 21, 2012 | 2004 Yamaha YZ 125

1 Answer

YZ 250 1995 2 stroke have spark,cleaned carby & fuel tank,good compression, mixture 35.1 cannot start my legs going to drop off... Timing has not been touched also use to start & run fine....


If you have a good fat spark and timing is stock, with good compression, your problem is likely fuel/air mixture. Assuming you have good quality fresh fuel/oil. Set air mixture screw one and a half turns out. What is the condition of the reeds and reed holders. Is there a build-up of fuel/oil residue on the piston port skirts or the crankshaft? Check for absolute seal between carby and reed valve manifold. Check for obstructions through airbox inlet, filter and inlet to carby. Ensure the governor is not fouling. The site link below has exploded view diagrams for all components of the bike to see how it all works. Good luck, cheers.

http://www.cmsnl.com/yamaha-yz250g1-1995_model10278/partslist/

Jul 15, 2010 | Yamaha YZ 250 Motorcycles

1 Answer

Yz125 spark plug problem


What does removed plug look like??

Is the plug correct for this bike, very important.

Jan 03, 2010 | 2003 Yamaha YZ 125

1 Answer

My yamaha blaster will not start after my chain came off and over reved it has spark and compression. what should i do?


If this bike is carburettored, not EFI then you have damaged / bent the reed valves in the carby.

Remove carby which has the reed valves on the inlet side and you will see them bent. Replace with brand new, you are wasting your time to try and straighten them!!

Dec 20, 2009 | 2008 Yamaha Yamaha G5

1 Answer

YZ 125 isn't getting fuel into it's cylinder


Check the carb bowl and make sure it is filling if so check the carb jets and also check the power/reed valves.

May 20, 2009 | 2003 Yamaha YZ 125

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