Question about 2002 Yamaha WR 426 F

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2002 Yamaha WR 426 F rear wheel locked up

Yam wr426 2002 just bought! On motorway taking it home back wheel locked gray smoke n droped oil over engine still compression though any ideas many thanx

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  • Yamaha Master
  • 58,537 Answers

Hi, Brettbury you may have hydraulic lock caused by excessive liquid in the cylinder or you have squeaked your top end this is commonly known as "HEAT SEIZE" the piston heats up expands and becomes extremely tight in the cylinder bore and usually occurs mainly on 2 cycle engines right after a fresh top end rebuild, but it can also happen to brand new motorcycles, these are rare instances due to better quality control and education. Overheating failures that cause pistons to seize are many and each one should be carefully diagnosed to prevent future repeat offenders and the usual suspects are:
1. Lack of lubrication due to low or no oil.
2. Among the causes of lack of cylinder, lubrication is clogging of lubricator by dirt or waste, obstruction in oil pipes/lines, leaky check valves, leaky pump packing, broken oil pipe/line, oil too cold to feed.
3. Wrong type of oil used in premix or oil tank.
4. Improper premix ratio you should start with 32:1 as a baseline.
5. New rebuild piston to cylinder tolerances set up too tight.
6. Failure to follow proper break in procedures with a 16:1 premix ratio.
7. Loose fasteners causing intake, base, or head gaskets to leak or blown crankshaft seal, failure caused by age, overheating or walking. 8. Holes in the intake manifold bent or warped intake flange or reed cage any stray air coming into a cylinder will cause a super lean condition.
9. Improper assembly of reed valve gaskets.
10. Insufficient warm up time for temperature conditions before wide open throttle.
11. Broken, pinched or cracked fuel line.
12. Carburetor fuel passages clogged or restricted from stale fuel varnish, ethanol sludge, dirt, rust, or fuel level in float bowl too low.
13. Main jet size too small or partially clogged
14. Air filter improperly installed, missing or not sealing.
15. Faulty or improperly adjusted oil pump and or cable.
16. Failure to bleed oil pump after a rebuild/replacement or running oil tank dry.
17. Engine coolant level too low, too old, or improper mixture ratio.
18. Radiator clogged, fins damaged, or faulty cap.
19. No liquid circulation due to failed oil or water pump.
20. Cavitation due to air in oil or coolant system.
21. Water and oil mix due to blown head gasket.
22. Timing retarded due to faulty CKP sensor or CDI.
23. Improper spark plug heat range (too hot) and or gap.
24. Excessive engine load, brakes dragging, clutch slipping, transmission lubricant level too low or viscosity to high.
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.
Had my first accident today Rear wheel locked up on the highway Still can...
Does anyone know the problem with WR426F
YAMAHA WR426F Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-wr-owners-manuals

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Posted on May 29, 2017

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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  • 101 Answers

SOURCE: I need to remove rear wheel for tire change on 2003 vstar 650

Hi .... The Xs is conventional, ie straight out the back. Put a plank of wood or something similar under the centre stand, this'll give you a bit of extra height and once the spindle is out the wheel will come out slightly to one side. Problem comes if someone has fitted an aftermarket custom exhaust which reduces egress. Also if you still have standard twin exhausts you may have to lower swingarm (by disconnecting lower shock bolts (thus the plank) to remove spindle. Remember to note spacers as it comes apart and regrease spindle on re-assembly.

Posted on Dec 24, 2008

  • 6982 Answers

SOURCE: White and gray smoke coming out back and underneath 1995 Chevy Bl

Too late to check now... you've got a blown head gasket. When the gauge starts to give you any indication that something's not right you must shut it down or this kind of thing happens. Could have started as a bad water pump, hose etc. With low coolant from that (or anything else) continued operation will kill the whole thing!...Sorry!!

Posted on Feb 19, 2009

emissionwiz
  • 85206 Answers

SOURCE: Suzuki GV burns oil

valve seals will not cause this kind of oil consumption, a scocred cylinder wall or broken piston ring will, not sure on the head gasket, does it have a combustion gases present in the radiator surge tank or bubbles while running? if not the head gasket is probaly ok.

Posted on May 28, 2009

  • 299 Answers

SOURCE: 1984 Mazda Rx6 (FI) - Gray smoke from exhaust

IF it has injectors that would be the problem but check to make sure if is not carburated if it is probably bad float

Posted on Sep 23, 2009

vetteman3002
  • 2299 Answers

SOURCE: I have a Briggs n

You have a blown head gasket. The gasket is leaking the fuel into the oil. You will have to replace the head gasket.

Posted on Sep 28, 2010

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1 Answer

Transmission wr 426 2002


Hi, Anonymous for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Yamaha, despair not, for a mere zero $0 you can download another one. 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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Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Mar 01, 2014 | 2002 Yamaha WR 426 F

1 Answer

Where is the spark plug on a wrf 426


Hi, Anonymous for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Yamaha, despair not, for a mere zero $0 you can download another one. 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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YAMAHA WR426F Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-wr-owners-manuals

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e


Jan 21, 2014 | 2001 Yamaha WR 426 F

1 Answer

How much oil do I put in a wr426


Hi, Anonymous for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Yamaha, despair not, for a mere zero $0 you can download another one. 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.
http://www.thumpertalk.com/topic/121639-help-wr426-oil-change
How to Change your oil LIKE BOSS Yamaha WR426 WR450 wr250
YAMAHA WR426F Owner Service Manual
OEM parts for Yamaha
YAMAHA WR450F Owner Manual

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e


Feb 10, 2013 | 2002 Yamaha WR 426 F

1 Answer

How much oil do I put in a wr426


Hi, Anonymous for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Yamaha, despair not, for a mere zero $0 you can download another one. 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.
YAMAHA WR450F Owner Manual
OEM parts for Yamaha
YAMAHA WR426F Owner Service Manual
How to Change your oil LIKE BOSS Yamaha WR426 WR450 wr250
http://www.thumpertalk.com/topic/121639-help-wr426-oil-change

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e


Feb 10, 2013 | 2002 Yamaha WR 426 F

1 Answer

Yamaha wr 426 f 2002 5th gear ratio


Hi, Anonymous the answer to this question is way above my pay grade and for this situation, I would call my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry.
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.
Primary ratio for WR250 Wr426
Difference between YZ426 WR426 gearbox
YAMAHA WR426F Owner Service Manual
OEM parts for Yamaha
YAMAHA WR450F Owner Manual

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Apr 11, 2012 | 2001 Yamaha WR 426 F

1 Answer

Pls help yamaha wr426 back wheel locked up grey/White smoke n droped oil! Loads of compression still but found water behind generator cover and when I took off rocker cover. Water on valves and grey a...


That sounds like it Hydrolocked. Usually caused by fluids enteri9ng the combustion chamber due to a blown gasket or something like that.
Strip the heads off and replace the head gasket, check foe damaged con rods and valves/guides.
That may be it and you will be up and running in no time.

Oct 24, 2010 | 2001 Yamaha WR 426 F

1 Answer

2002 yamaha wr426 runs great when riding and I let


Inspect your cam chain for wear. try backing off your cam chain tensioner and resetting.

May 24, 2010 | 2002 Yamaha WR 426 F

1 Answer

2002 Yamaha WR 426 engine F oil capacity


Hi, Kylie_hender for this scenario you will need your service/owners manual if you can't find the best tool you ever bought for your Yamaha, despair not, for a mere zero $0 you can download another one. 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.
engine oil capacity for 99 WR400 My manual is somwhere
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Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e


Apr 02, 2010 | 2002 Yamaha WR 426 F

1 Answer

My wr426 2002 model idles ok then when you back


Hi
Its only the chutch wire and clutch plate setting...
Just get a new clutch wire and all will be well.
Regards
Berry

Jan 31, 2010 | 2002 Yamaha WR 426 F

1 Answer

Did yamaha make a wr 400 in 2004?


I think you will find that the WR426 was last made in 2002. From that point forward it was WR250 and WR450 in the manufacturing line.

Oct 28, 2009 | Yamaha WR 426 F Motorcycles

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