Question about 2007 Yamaha WR 450 F
My 450 wr starts sputtering as I hit 3rd speed and start to accelerate, went thru carb and bigger jet helped but didn't eliminate, there are 3 types of test on the t.p.s. 2 of them passed the 3rd didn't tell me how to do the third test, if im doing it right
Hi, Gerard and the usual suspects are:
1. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
2. 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.
3. Spark plugs in bad condition or partially fouled.
4. Spark plug cables in bad condition and leaking check for spark leakage in the dark
5. Spark plug gap too close or too wide.
6. Faulty ignition coil, module, and or sensor.
7. Loose, dirty, or corroded ignition module connector at crankcase.
8. Faulty CKP or CMP, MAP, ETS, ATS, TPS, O2 sensor.
9. Dirty air filter.
10. Intake air leak.
11. Water, dirt, or rust in the fuel system, carburetor and/or filter.
12. Old dead or bad fuel.
13. Fuel tank vent system plugged or carburetor vent line closed off.
14. Vacuum line from intake manifold to fuel valve is broken, cracked, pinched, or missing.
15. Carburetor controls misadjusted.
16. Damaged carburetor.
17. Incorrect valve timing.
18. Weak or broken valve springs.
19. Damaged intake or exhaust valve.
20. Check for engine trouble codes
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.
Diconnected TPS good results WR450 WR 400 426 450
YAMAHA WR450F Owner Service Manual
OEM parts for Yamaha
YAMAHA WR450F Owner Manual
Posted on Dec 27, 2016
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Posted on Jan 02, 2017
hi there matey,, if she starts perfect wen shez cold ,,and u ride her up the road till shez hot,, does it start misfiring while u are riding it,then a quick check will be needed, if it does misfire then soon as she misfires while riding,,kill the engine and wip out the spark plugs and check wot the colour of the plugs are,, they should be a biscuit brown colour ,,either 1 and 4 plugs or 2 and 3 plugs will be the same ,, if say 1 and 4 are not a brown colour then u need to change that coil to 1 and 4,, at the end of the day mate ,, if she doesnt start wen hot ,,its usually a coil that is the prob,, any more help u need come back,, cheers
Posted on Mar 24, 2009
if it has been sitting for awhile you might need to clean the carbs -clean the stock carbs and get it running before making changes -check comp. as well-bike bandit seems to have a good selection of older bike parts
Posted on Jun 27, 2009
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