Question about 2004 Yamaha YZ 450 F

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Oil leaking behind kickstart

Hi there i have a oil leaking out of the seal behind the Kick start and wondering how to change it ?

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  • Yamaha Master
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Hi, Scott 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 $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.
Oil leaking at Kickstarter shaft KX250F
07 YZ450F Leaking clear yellow fluid from bottom right of engine
YAMAHA YZ450F Owner Service Manual
OEM parts for Yamaha
http://www.yamaha-motor.com/assets/service/manuals/2004/lit-11626-17-11_784.pdf

Posted on Aug 09, 2016

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 6 Answers

SOURCE: front fork leaking oil from bottom of the seal.

This is one of the few things that I recommend you take to a shop - you need some very special tools and techniques to fix this problem. Sorry,
Kevin

Posted on Dec 30, 2008

onyeredson
  • 404 Answers

SOURCE: yz 250 wont kickstart

Hi!
You obviously look after your machine and very sensible when laying up, however as you are probably aware 2 strokes rely heavily on compression, A. to produce excellent combustion and B. to draw fuel into the chamber. So when you try kick starting you can't get enough revolutions to draw the correct amount of fuel into the cylinder, where as you push start you constantly turn over the engine increasing compression slightly and bingo it fires.
Can you remember how when kick starting it before this problem the feel on resistance when kicking over? has it now become a lot easier? if so you possibly have worn or broken compression piston rings.
A compression test will reveal this, I hope this sorts your query?
Press the Blue button please for my FREE effort,
Thank You!
Paul 'W' U.K.

Posted on Feb 06, 2009

SOURCE: I have a major oil leak

Yes theres a seal over there.
It has to be replaced.
visit ------->> www.xjbikes .com

Posted on May 22, 2009

  • 311 Answers

SOURCE: i have a 1991 Yamaha fzr600. My bike starts and

it depends on where it is leaking,if its a rocker cover gasket it would be reasonably inexpensive but if its a head gasket it wont be,check the rocker cover hold down bolts,they have a cup washer and a rubber seal under them,yamaha use them on fj,fz,fzr,xj etc and they do start to leak after a while(the rubber starts to harden with the engine heat),they are about 30c each and are easy to replace

Posted on Jul 04, 2009

ollie reece
  • 1167 Answers

SOURCE: left front for leaking on 1993 yamaha fzr 600

hi buddy add 440mls of medium fork oil to it and go onthis site to show you how to strip them http://www.motorcyclistonline.com/howto/replace_fork_seals/index.html

Posted on Sep 28, 2009

Testimonial: "thanks for your help very helpfull"

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1 Answer

Lambretta kickstart problems


There can be several reasons for this. If there is a lot of chattering noise from the kick start then there is a mechanical interference between the kick start teeth on first gear and the kick start plunger. If there is no noise but the kick start does not return check if there is enough pre-load on the kick start return spring or that the kick start arm is not catching on an external part of the engine such as the exhaust tail pipe. Either way, you'll end up taking the side case off so tip the scooter on it's L/H side so you don't have to change the gearbox oil but remember to put it all back together before standing the bike upright, else the oil will pour onto the floor.

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Kickstart is stuck


Hi, Anonymous you may 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. Loose fasteners causing intake or base gaskets to leak or crankshaft seal failure caused by age, overheating, or walking.
2. Improper assembly of reed valve gaskets.
3. Improper oil/fuel premix ratio.
4. Broken, pinched, or cracked fuel line.
5. Carburetor fuel passages clogged or restricted from stale fuel varnish, ethanol sludge, dirt, rust, or fuel level in float bowl too low.
6. Main jet size too small.
7. Air filter improperly installed, missing or not sealing.
8. Faulty or improperly adjusted oil pump and or cable.
9. Failure to bleed oil pump after running oil tank dry, rebuild of pump or replacement
10. 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.
11. Wrong type of oil used in premix or oil tank
12. Improper spark plug heat range (too hot) and or gap.
13. Ignition timing retarded, faulty CDI.
14. Excessive engine load, brakes dragging, clutch slipping, transmission lubricant level too low or viscosity to high.
15. Engine coolant level too low, too old, or improper mixture ratio.
16. Engine coolant pump failure, damage, or passages restricted.
17. Radiator clogged, fins damaged, or faulty cap.
18. Failure to follow proper break in procedures.
For more information about your issue and valuable "FREE" downloads that you will need please visit the websites below. Good luck and have a nice day.
dt125 kickstart jammed and possibly more
Yamaha DT125 seized up engine
http://www.motogelnar.cz/manual/YAMAHA/DT125X_RE-05-Service_Manual.pdf
OEM parts for Yamaha
http://www.dt125.cz/download/Owners_Manual-DT125X_RE.pdf

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1 Answer

Looking for a diagram showing how to assemble kick start mechanism (oil seal, spring guide, ratchet, stopper...ect) 2005 yz250f


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 $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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OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

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Hi, i am sorry but you dont say what the model of your machine is, this would help me determing the correct, answers for your questions, most kickstart springs can be changed by simply removing the clutch cover followed by the kickstarter shaft and then replacing the spring, make a note of kickstart stop location carefully remove the shaft holding the gears together replace the spring followed by the. Replacing the shaft and tensioning the spring before cover replacment, oil,etc. Some machines the shaft and spring is inside the centre cases and a complete engine strip is ness

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1 Answer

I have a leak coming from inside the bell housing of my transaxle leaking onto my clutch making it slip new clutch replaced less than a week ago and rear main seal replaced oil smells like gear oil (rotten...


There is an oil seal on the gearbox/transaxle input shaft. If this has failed it will leak oil on to the clutch.It might be able to be replaced by just removing the gearbox again to access the seal. Most likely though is, the gearbox will need to be opened up to replace it.

Oct 12, 2010 | 1998 Suzuki Swift

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In my LML Vespa Select II 1996 model, the oil from the engine leaks to the break drum, through the region where the bearing is located. i have changed the oil seal a number of times, but the oil still...


Hi, Richtarzan the seal is not the issue if you are confident that's where the oil is coming from then you have a venting issue or the shaft the seal is riding on is faulty and needs to be replaced.
Good luck and have a wonderful day.

Jun 07, 2017 | Vespa Motorcycles

1 Answer

My front forks are leaking oil so i assume its my seal.How DO I CHANGE THE SEAL??? i WAS ALSO WONDERING IF WAT THE LITTLE SILVER LEVER ABOVE THE CLUTCH IS FOR? PLEASE HELP


take the forks to a bike shop, you can do it yourself but would need a seal driver to refit the new seals. the lever will be a decompressor, use it to get the engine just past top dead centre(the hard bit to kick) and then kick the bike

Mar 29, 2010 | 2003 Honda CRF 450 R

3 Answers

Yz 250 wont kickstart


Hi!
You obviously look after your machine and very sensible when laying up, however as you are probably aware 2 strokes rely heavily on compression, A. to produce excellent combustion and B. to draw fuel into the chamber. So when you try kick starting you can't get enough revolutions to draw the correct amount of fuel into the cylinder, where as you push start you constantly turn over the engine increasing compression slightly and bingo it fires.
Can you remember how when kick starting it before this problem the feel on resistance when kicking over? has it now become a lot easier? if so you possibly have worn or broken compression piston rings.
A compression test will reveal this, I hope this sorts your query?
Press the Blue button please for my FREE effort,
Thank You!
Paul 'W' U.K.

Feb 06, 2009 | 2000 Yamaha DT 125 R

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