Question about 2004 Yamaha TDM 900

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TDM 900 not starting keeps Flooding

My 2004 (04 plate) tdm keeps flooding on starting why is that? The bike turns over but doesn't fire up. Each time it has happened the nice RAC an said it' s flooding.

Posted by Anonymous on

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  • Yamaha Master
  • 43,109 Answers

Hi, Anonymous and the usual suspects are:
1. Dirt or other foreign matter between float valve and its seat.
2. Float valve sticking.
3. Float valve and/or valve seat worn or damaged.
4. Float misadjusted.
5. Float cracked, leaky or damaged.
6. Excessive "PUMPING" of hand throttle grip.
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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Won Start Just Turns Over And Backfires Fixed
Yamaha 2002 TDM900 Service Manual
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Yamaha TDM900 Owner Manual

Posted on Dec 06, 2016

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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Cmoney Franz
  • 1 Answer

SOURCE: will not start turns over ok but will not fire up

during the winter you can get build up on the tip of your spark plug that will prevent the engine from firing. remove the spark plug and soak it in gas for ten minutes or so. Dry it ogg with a clean towel reinstall it and it should start right up.

Posted on Jun 04, 2009

darrenl77
  • 10 Answers

SOURCE: 2001 yz426f carb flooding keeps flooding plug

The solution is to replace the needle and seat inside the carb. That controls the amount of fuel pulled in through the intake. Also, it is necessary to ensure that the float level is correctly set.(Usually level with the bowl on this model)

Posted on Dec 15, 2009

SOURCE: 1995 yamaha xj diversion 600s bike hard to start

Time for carburator clean up , float level resetting and all, plz visit this site for more info www.xjbikes.com
Good luck!

Posted on May 14, 2010

  • 17 Answers

SOURCE: my XS850, though getting spark,

Remove carbs and make sure all of the fuel inlets are seating properly. you should probably clean them good and set all the floats while you have them off.

Posted on Oct 02, 2010

  • 1 Answer

SOURCE: 1983 Yamaha virago. Lots of problems.

check your YICS box for leaks. 1. There is a seperation in the middle of the box, check for visible possible leaks. If you seem to have nothing visible, put a plastice tube in one side and the other. Block one end of a tube and blow into the other. You should get resistance as if no air is able to escape. Youcan also take one tube and place it in a continer of water. When you blow into the other end you should get NO BUBBLES; if you do there is a leak. You can use a high temp gasket maker to re-seal the box, make sure of course that you keep the gasket aterial ONLY where it is needed to keep the compartments seperated as they are. After these tests there is a way to re-seal the center seperation but it requires a band saw and a perfect cut down the center of that seperation. Please! do not attempt this without more information as a mistake will most likely ruin the box.

Posted on Sep 29, 2011

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2 Answers

Engine turns over very fast but will not fire.engine management light staying on. Bike is a TDM 900


Hi, Anonymous and the usual suspects are:
1. Fuel tank empty.
2. Fuel supply valve/petcock turned off.
3. Fouled spark plugs.
4. Engine flooded as a result of overuse of the enricher.
5. Vacuum hose to the fuel supply valve/petcock disconnected, broken, cracked, or pinched.
6. Fuel valve/petcock or filter clogged.
7. Severely discharged or damaged battery, you need 12.5 volts or better and be able to pass a load test if necessary.
8. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
9. Loose or corroded wire connection at the coil, battery or plug between ignition sensor and module.
10.. Spark plug cables in bad condition and shorting, cable connections loose, or connected to the wrong cylinders.
11. Ignition timing incorrect due to a faulty ignition coil, ignition module or sensors (MAP, CMP, CKP, O2, TPS, ETP, IAC,or BAS).
12. Faulty neutral, clutch lever, or kickstand safety switch.
13. Faulty fuel pump fuse or relay.
14. Tilt sensor needs a reset.
15. Security system not disarming alarm needs a reset.
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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http://www.carpe-tdm.com/tdmforum/viewtopic.php?t=4614&sid=dd4ac295cc6d2a2436a5243f29adadcd
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1 Answer

Fuel level adjustment for 1999 TDM 850 with 4TX4 40 carby


there is no adjustment, if its flooding, clean and or replace the fuel needle, this probably has a neoprene point, so the seat cant be worn. and it cannot wear or change adjuctment to cause a lack of fuel flow

May 11, 2014 | 1994 Yamaha TDM 850

1 Answer

Tdm 900 goes down on one cyl in the rain


Hi, Anonymous you need "FIVE" things in order for a cylinder to run properly: and number 3 is dying to be picked
1. FUEL: in order to validate your not getting fuel spray some starting fluid into the air cleaner and hit the starter button, if it fires up and runs for a few seconds then you know you have a fuel delivery issue.
2. SPARK: remove the spark plug and with it connected to the spark plug cable ground the threads to something metal you should see a bluish white spark if not you have a faulty spark plug, spark plug cable, ignition coil, condenser, CKP, ECM, sensor or the wiring in between.
3. COMPRESSION: you must have at least 80-100 PSI for most bikes if not perform a leak down test you may have a burnt or bent valve or hole in the piston or broken rings.
4. CAM TIMING: confirm your timing marks are aligned to see if the cam chain or adjuster are worn out and the chain has skipped a couple teeth.
5. IGNITION TIMING: on older bikes check to see if your points have not closed up, timing plate has not become loose and confirm with a timing light for proper retard and advance functions, on newer bikes where timing is controlled by an ECM and is nonadjustable check you CKP, TPS, MAP, O2, sensor or it's counterpart for integrity.
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Dec 07, 2013 | 2004 Yamaha TDM 900

1 Answer

Tdm850 firing one cylinder


Hi, Anonymous you need "FIVE" things in order for a cylinder to run properly:
1. FUEL: in order to validate your not getting fuel spray some starting fluid into the air cleaner and hit the starter button, if it fires up and runs for a few seconds then you know you have a fuel delivery issue.
2. SPARK: remove the spark plug and with it connected to the spark plug cable ground the threads to something metal you should see a bluish white spark if not you have a faulty spark plug, spark plug cable, ignition coil, condenser, CKP, ECM, sensor or the wiring in between.
3. COMPRESSION: you must have at least 80-100 PSI for most bikes if not perform a leak down test you may have a burnt or bent valve or hole in the piston or broken rings.
4. CAM TIMING: confirm your timing marks are aligned to see if the cam chain or adjuster are worn out and the chain has skipped a couple teeth.
5. IGNITION TIMING: on older bikes check to see if your points have not closed up, timing plate has not become loose and confirm with a timing light for proper retard and advance functions, on newer bikes where timing is controlled by an ECM and is nonadjustable check you CKP, TPS, MAP, O2, sensor or it's counterpart for integrity.
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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1 Answer

I have a Yamaha TDM 900,do you shorten the "dog bone" links to lower the bike.


not sure about tdm specifically but on most bikes lowering requires longer links

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2 Answers

Over fuelling on 1994 yamaha tdm 850


its flooding out the carb, clean and or replace float needle

Oct 23, 2012 | 1994 Yamaha TDM 850

1 Answer

Tdm 900 and cutting out in the rain or wet road


Hi Paul. Your model of TDM is known for this problem. The design of the ignition system is poor and allows moisture to accumulate, leading to loss of spark on one cylinder. The good news is that you can fix it with a little effort. You can find some advice on fixing it here: http://jbx9.free.fr/tdm/index.php?page=ISSUES#1_5

This thread on Carpe-TDM may also help: http://www.carpe-tdm.net/ipb/index.php?showtopic=15971

Best of luck. The TDM is a great bike once you have ironed out the niggles.

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https://www.louis.eu/rund-ums-motorrad/bike-datenbank/yamaha-tdm-900/rn08/1040
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My tdm 850 has just started to miss and back fire and am having trouble getting it started now it has not been on the road since october and was fine then i was just getting it back ready for the spring...


was it laid up with fuel in the tank if so after four months the fuel is almost definately stale drain the tank also drain the oil & replace the oil filter clean the air filter & fit new spark plugs these simple steps should see you back on the road enjoying the spring & summer all the best

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sell your bike your too thick to own one!!

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