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????????

Posted on Jul 06, 2009

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2 Answers

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.

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Oct 22, 2012 | 2005 Yamaha DT 125 X

1 Answer

1974 DT 125 is bogging down


Hi, Anonymous engine "BOG" is mainly caused by a rich air and lean fuel condition but it can also be caused by a lean air and rich fuel condition this situation rarely occurs and is only caused by the misinformed weekend warrior that owns a toolbox.
The more you open your throttle the more vacuum you are creating in your carburetor venturi and your intake manifold. When you are operating at higher RPM any unmetered air that leaks into your system can become more obvious.
Unmetered air is air that is getting into your system after the fuel has been delivered. If you have unmetered air getting into your system between the butterfly/slide of the carburetor and the cylinder head this will create a lean condition.
All of the rubber components of the fuel system like vacuum hoses and intake manifold that you mount the carburetor to are made of rubber. If none of these components have been changed out they are more than likely highly degraded and probably cracked in places to allow unwanted-unmetered-contaminated air into the combustion chamber. Check all of your vacuum lines and vacuum plugs for carburetor synchronization. The vacuum plugs are in the head just after the rubber intake manifolds. The petcock has a vacuum line as well as part of the emission system.
1. Check the intake manifold for cracks.
2. Ensure the bands used to tighten the manifolds down on the intake are secure and have not bound up the manifold.
3. Make sure air box fittings are not warped and fit completely over the carburetor.
Your airbox is metering air and is the first step in a process of consuming air and fuel. The system requires the resistance of the air filter in order to get the proper vacuum to "SUCK" the fuel out of the float bowl and create the proper venturi effect.
Improper mounting and sealing of the airbox will create a small lean effect. This might seem like no big deal but you are inviting dust and debris in your engine that is doing slow damage by not having proper fitment. Fix it so you know it's not contributing to your issue. Pick the low hanging fruit first.
Do not go and start adjusting anything at this point. It ran fine before. There is something wrong with the assembly or a component. Do not adjust your floats. Get it back to where it was. The moment you start tweaking everything is the moment you lose OEM settings which are a must have for fine tuning and maximum performance.
Fine tuning your carburetor and multi carb syncing come at the very end following the proper procedure established by the Carburetor Gods.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
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Apr 20, 2012 | Yamaha DT 360 Motorcycles

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

3 Answers

Egr valve flow insufficient


Check for

vacuum leaks on intake manifold,

the air tube between the air filter.

intake manifold vacuum hose.

===
clean throttle plate with Berryman carburator cleaner

SEE sample picture HERE
===

Also remove carbon built up behind the EGR valve and the EGR passage tube.

===

Vacuum leak WILL offset the intended 14.7 to 1 air fuel ratio.

More un-metered air (leaks) will lean out the fuel mixture.

Use small amount of Berryman carb clearer at potential air leak area will help you identify trouble spot.

At idle,just spray and listen for the RPM surge.

The in-rush of carb clearer will increase the RPM on the motor.

Record the problem spot(s) and address it later.

===

EGR carbon built up require 2+ hours to clean from start to finish.

You will need a new EGR base gasket before your start.

Locate and remove the EGR valve after the vehicle is cool down.

Carefully record the connector and vacuum line (for older vehicle) location by drawing an easily to follow diagram.

Remove the EGR valve.

Inspect the location of the carbon built-up inside the valve and the EGR passage tube.

SOAK these areas with WD-40 spary.

You will need a small screwdriver,cloth hanger and lot of newspaper and time to get this cleaning done right.

RE-SOAK the carbon and let it sit for over-night will also help.

One the last round,pass a shop vacuum of the EGR valve and the passage pipe.

Install the new EGR gasket and connectors.

Allow the vehicle to warm up outdoor to burn up any remaining WD-40.


Take it for a test drive.


Please rate my answer if it's useful to you.


Cheers,

Mustgo

Sep 25, 2009 | 1999 Chevrolet Malibu

2 Answers

I have a 1998 k1500 i think i have a bad egr valve but im not sure. there is not a vaccum hose on it. so i cant check it that way. any tips


The EGR's rarely go bad if you have alot of carbon and it comes and goes then clean the EGR of carbon and try to clean the carbon from the intake as well. A small piece of carbon lodged in the EGR will keep it open and cause these problems, it will then blow out run good til the next piece get lodgedinside. If the EGR failed, because it is electronic, it would give you a code as to the pintle selonoid failure.

Aug 02, 2009 | 1998 Chevrolet K1500

2 Answers

Removing and cleaning egr valve


There is one bolt that holds the egr tube to it and two bolts that hold it to the intake manifold take them out, unplug the electrical connector and its off.  Once the EGR is off, Spray it clean with Carb cleaner and make sure that there are no moving parts are binding and re-install. If needed replace the old gasket with a new one. Good luck and hope this helps and if your not sure where the EGR valve is, it's just behind the throttle body. Good luck and hope this helps. 

Jul 03, 2009 | 1999 Pontiac Montana

1 Answer

1985 Toyota Pickup 22R


When the engine is running ragged, place your hand over the opening of the carburator. If the idle smooths out, you have a vacuum leak somewhere on the intake system; it could be the base gasket for the carb, the intake manifold gasket, or a broken vacuum line, or a combination of that. What you have is too much air getting into the engine, but the air is not going thru the carb. Please check for vacuum leaks, you can use a can of carb cleaner, spray the intake manifold, if the idle smooths up, that would be a good place to start.

Oct 09, 2008 | 1985 Toyota Pickup

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