Question about Yamaha YZ 250 Motorcycles

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How tight should my dirt bike chain be on my yz250 2stroke 2002

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  • Yamaha Master
  • 43,101 Answers

Hi, Soccerleg728 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.
Dirt Rider Magazine
Part 47 Motocross bike Adjusting chain slack YZ250F
YAMAHA YZ250 LC Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Posted on Jul 26, 2016

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Posted on Jan 02, 2017

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DickCanFixIt
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SOURCE: chain needs to be 1/4

1/4" is too tight, you should have one inch minimum. Check it while the bike is upright sitting on the tires. Move the longest part of the chain up and down and you should have one to one and a half inches of play.

As a comparison, my BMW 650 has seven inches of suspension travel at the rear and my spec is 45 to 55mm which is about an inch and 3/4 to two inches.

Posted on Apr 27, 2009

  • 11 Answers

SOURCE: i bought dirt bike for husband! is 2005 yamaha

Congrats on the purchase! easy way to tell look at the exhaust pipe. if it is just a thin tube that is tight to the engine and goes right to the muffler it is a 4 stroke (250f). the four strokes have a square-ish head. Deep/bass-y engine sound. If you have a large (probably black) exhaust pipe with a large bulge in it (5-6" diameter) that wraps around the front of the frame, its a 2-stroke. They have a more round cylinder head. Beautiful pingy sound and a little smokey at start up. DON'T FORGET TO MIX YOUR GAS!!! there should be a serial number sticker at the very front of the frame (behind the number plate where your triple clamp/handlebars connect) Probably on the left side. Hope it helps! rate please :)

Posted on Jun 14, 2009

ollie reece
  • 1167 Answers

SOURCE: how do i tighten the chain on 2002 yz250?

  • Loosen off the axle nut (B) until it is only lightly tightened. Wind out the chain adjuster bolts (C) evenly on both sides until you reach the desired tension. You will see the top of the chain rise as you wind out the adjuster bolts.on pic below

Once you reach the correct tension, make sure both sides are evenly spaced (using the marker grooves on the adjuster blocks). Squeeze the chain against the swingarm with your hand to hold everything in place and tighten up the axle nut.Tighten up the chain adjuster lock nuts. Now you're ready to ride!
  • Tighten up the chain adjuster lock nuts and thats it buddy measure the chain on the swing anr amr it should be 45mm slack on the swing and arm where the chain slider is 54159bf.jpg

Posted on Oct 03, 2009

Magaiver
  • 707 Answers

SOURCE: how to check the oil

Their should be a sight glass on the left hand side of the bike at the bottom but if mixed for a 2stroke u should know in the mixture directions.

Posted on Aug 10, 2010

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1 Answer

I need to get the tire on my 250CC dirt bike fixed. How do I get the wheel off and on? How do I make sure the chain is tight like it is right now?


Look at the back wheel fork, you should see marks on it that line up with marks on the axle fitting. Check the chain for a master link. If is has one you can take the chain off there. If not loosen the axle and push the wheel forward to get slack in the chain.

Jan 18, 2015 | Motorcycles

1 Answer

How do you adjust chain


Flip bicycle up-side-down so it sits on the seat and handlebars. Loosen the 2 nuts that hold the rear wheel on. Sitting behind the bike on the ground, so that you can align the wheel to a straight position, pull the wheel back so that the chain is snug. You don't need to pull hard, just hold the wheel in place and straight. Using the other hand, slowly tighten the axle nuts back down until the wheel is held in place. Once the nuts are tight enough to securely hold the wheel, tighten the nuts. Sometimes this method will make the chain too tight. If this happens, repeat the process as above, only this time when you go to tighten the nuts back down, squeeze the chain slightly to create a bit of slack. Ideally, the chain will be tight enough not to skip or slip, and at the same time, loose enough not to make noise, bind up, or do any damage.

There are "chain tensioners" available that hook around the rear dropouts of the frame and also around the axle, allowing you to tighten the chain to exact specs. simply by tightening or loosening adjuster screws. They will also help to keep things from loosening up over time. These make things much easier and I highly suggest looking into them.

Use any of a variety of oils and lubes available, but try to avoid WD-40 for chain lube. It will stop a squeak for now and make things seem to move smoother, but in the long run, WD-40 will attract dirt and debris to the constantly moving parts of your chain and can shorten the life of a chain considerably. Hope this helps.

~Ed

Jul 13, 2014 | Huffy 26 in. Cranbrook Cruiser Bike

1 Answer

125cc dirt bike chain keeps falling off when i change gears???? why is this happening and how can i resolve the problem.....please


Here's a video Martin Frereault suggested as a solution to your problem from YouTube:


How To Adjust Your Motorcycle Chain

Apr 28, 2013 | Pit Bike 125cc 4 Stroke Dirt Bike

1 Answer

My chain has gone to tight and it locked in gear


Try rolling the bike back and forth while trying to take it out of gear if this doesn't work ur clutch has brine burned out and ha s locked ur gears up but this one would be the last thing to check once u have tryed rolling it.

Aug 12, 2012 | Pit Bike 125cc 4 Stroke Dirt Bike

1 Answer

I replaced the rear tire & chain slider on my 2002 triumph america & now i have a growl type vibration from 20-30 mph. all other speeds and the bike runs smooth. chain & rear wheel appear to be...


did you get the wheel and tire Dynamically balanced at the bike shop, if not , Do, check tire pressure , yes its possible and it might make a noise if installed backwards.
new tires make funny noises , but sounds like balance issue

Jun 13, 2012 | 2002 Triumph Bonneville America

1 Answer

Starting problem my ct100 bajaj bike


You need to do a few things to make it start.
  1. Replace the spark plug
  2. Set the intake valve clearance at .002"
  3. Set the exhaust valve at .003"
  4. Tighten the cam chain
  5. Make sure the carburetor is clean, meaning all jets are clear. You may need to remove the float bowl to make sure there is no varnish or dirt in bowl.
  6. Your problem is most likely tight valves. The bike gets very hard to start and runs like **** when it does start.
  7. When you go to kick start it check to make sure you have compression, tight valves make you lose the compression and it kicks right through when you attempt to start the bike.

Dec 04, 2008 | 2007 Bajaj CT 100

2 Answers

Chain lubricant


Most are spray mate but I have used chainsaw oil in the past its very good easy to clean off if it flings and I just used to put it on the chain with an old paint brush.,,,

Nov 10, 2008 | 2002 TM Racing E 400

1 Answer

Chain


Put it up on your stand lossen the axel and remove the bolt on the bottom of the shock. Then tighten your chain and lift your swingarm up until its horizontal with the ground, then the chain should have almost no play. Not completely tight, but almost no play. Tighten the axel, and the bolt on the shock, and your set,,,

Nov 10, 2008 | 2002 Husaberg FE 650s Dirt Tracker Chrome...

1 Answer

Chain


Put it up on your stand lossen the axel and remove the bolt on the bottom of the shock. Then tighten your chain and lift your swingarm up until its horizontal with the ground, then the chain should have almost no play. Not completely tight, but almost no play. Tighten the axel, and the bolt on the shock, and your set,,,

Nov 10, 2008 | 2002 Husaberg FE 650s Dirt Tracker Black...

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