Question about 2003 Yamaha DT 125 R

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Yamaha DT 125 R intake leaks

Last year I had bad vacuum leaks at the base of all carbs. I installed ALL new manifolds which helped alot, but I still can stall the engine by carefully spraying choke cleaner at the base of the carbs.what else can I do to get rid of the leaks? Any suggestions appreciated. Has anyone heard of this before -venture or v max owners???

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  • Anonymous Mar 14, 2014

    there are two pipes running from the intake manifold on the engine,one goes to the carb,where does the other go????


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Pull the heads and have the intake manifold mating surface planed.

Posted on Nov 10, 2008

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Hello whats the best way to deristrict my 02 dt125r????????

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Rpms go up down

check for a vacuum leak around intake manifold or any hoses going off the intake. if you cant get at .the vacuum hoses of try pinching them and see if rpm goes down.

Jan 16, 2014 | Yamaha XJ 650 Motorcycles

1 Answer

Yamaha DT 125

If is violently loosing coolant from overflow then best case you need new radiator cap worst case head gasket needs replacing.

If it squirts a little when hot now and again or when you turn motor off squirts or drips a little then this is probably normal. just releasing pressure

I am guessing its leaking alot or you wouldn't have posted here.

Oct 22, 2012 | 2005 Yamaha DT 125 X

1 Answer

My yamaha dt 125 won't start I cleaned the carbs

try your reeds they might be fouled they are vary easy to fix just gotta take your carb off to get to them

Feb 27, 2012 | 2000 Yamaha DT 125 R

1 Answer

I have a stock 96 FXSTC. IT will intermittently run on 1 cylinder. Sometimes it starts on 1 cylinder then 2 kicks in then after a few minutes goes back to 1. Its back and forth. Sometimes it also hard to...

I would suspect a vacuum leak somewhere. I'd start by running a compression check on the engine. Each cylinder should have about 125 psi compression and no more than 10% variance between the two cylinders. But since you said both cylinders do run from time to time, I doubt this is the problem. Then, I'd check to make sure the vacuum hose was not pulled off the nipple on the backside of the carb that goes to the VOES and the vacuum operated fuel petcock. On at least on occasion, I had an FXR that was doing exactly what you are describing. It turned out to be a vacuum leak in the fuel petcock itself. The diaphragm had become dislocated somehow, possibly a "spit back" through the carb, and caused a vacuum leak. Check the petcock for a vacuum leak using a hand operated vacuum pump. If it won't "hold" a vacuum, then the diaphragm may be bad. Either replace the petcock with a new H-D unit or a high quality manually operated valve like a Pingle. You also may need to replace the intake manifold gaskets at the heads and the seal that the carb plugs into. Your bike is 15 years old and if these are the original gaskets and seals, they may have failed. They aren't expensive nor difficult to replace. Just make sure that you get the intake properly aligned before you tighten the bolts that hold the intake to the heads. Put the carb in the intake and bolt the air filter backing plate up before you tighten these four bolts. This aligns the intake properly. Harley makes a tool that they used to do this with but you really don't need it if you do the job like I described.

Good Luck

Sep 03, 2011 | 2009 Harley Davidson FXSTC Softail Custom

1 Answer

Ok, i recently purchased a DTR 125 R 2000 model with running problems The bike will start with the choke on, then die with the choke off, the fuel/air mixture screw was mashed up so i purchased another...

Sounds like a vacuum leak is leaning out the mixture....check the intake between carb and engine for leaks...another source may be tjhe crankcase seals are leaking.

Mar 31, 2011 | 2000 Yamaha DT 125 R

1 Answer

Problem with autolube pipe 1999 yamaha dt 125 air cooled

it will rev cause it is sucking air where the oil pipe used to be. the tube will be close to the rubber intake, if not on the intake itself

Feb 12, 2010 | 2000 Yamaha DT 125 R

1 Answer

I have a dt 125 field bike will not kick start

try squirting some fuel on the inlet and see if it firse get back to me with results

Oct 11, 2009 | 2000 Yamaha DT 125 R

1 Answer

My KLX 125 2004 will turn over but wont idle

Might check: Air filter, choke malfuntion or sticking, dirty carb (idle circuit), valve adjustment, and sometimes a weak spark (cap, plug, wire). Could need a new top end (check compression after adjusting valves) or a vacuum leak in the intake manifold (cracks, petcock line off...not sure if this model uses a petcock vacuum shut off). Good luck.

Jun 25, 2009 | 2004 kawasaki KLX 125

1 Answer

I have a 2002 Yamaha Zuma II, it has a new battery, Plug and gas. It has great compression but will not start unless you spray into the carborator? I bought a new carb and checked all the jets, still the...

Hi and welcome to FixYa,

Based on your description, bike will start if you spray fuel into the carb, then the carb is not getting fuel. A couple of ideas you may want to explore/check/clean:
  • fuel valve;
  • some fuel valve have 3 positions, OFF, ON, PRI where the ON would only allow fuel to flow if there is sufficient vacuum from the intake manifold; the PRI allows fuel to flow unrestricted;
  • float settings of the carb;
  • fuel filter. Some tanks have built-in strainer/filter right before or part of the fuel valve.
Just a start, do postback how things turned up or should you need additional information. Good luck and Thank you for using FixYa.

Nov 27, 2008 | 2003 Yamaha YZ 125

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