Question about 2001 Yamaha WR 426 F
Posted by Anonymous on
Hi, Anonymous 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.
12. Carburetor damaged, contaminated, sticky float, plugged jets.
13. Fuel filter clogged.
14. Old or contaminated fuel.
15. Fuel tank vent system plugged or carb vent line closed off.
16. Gas cap diaphragm valve faulty.
17. Vacuum line from intake manifold to fuel valve is broken, cracked, pinched, or missing.
18. Carburetor controls misadjusted.
19. Incorrect valve timing.
20. Valve springs floating, weak, or broken.
21. Damaged intake or exhaust valve.
22. Incompatible performance parts.
23. 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.
2001 wr426 5th gear spiking
YAMAHA WR426F Owner Service Manual
OEM parts for Yamaha
YAMAHA WR450F Owner Manual
Posted on Feb 03, 2017
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Posted on Jan 02, 2017
First bleed the MC, Remove the brake hose - block the outlet of the MC with your finger - pump the lever and crack you finger loose for an instant to bleed the air out - repeat til only fluid comes out. Quickly install the brake hose. Bleed the brakes by cracking loose the brake hose bolt. Bleed at the caliper bolt. Bleed as normal with the bleeder valve.
Posted on Nov 10, 2008
What state are you in? I live in California and have two Yamaha 426 bikes. One is dirt only costs $60 to register Green sticker for two years and the other is street legal and it's registration fees are based on its value and renews every year
Posted on Dec 28, 2009
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