Question about 2002 Yamaha YZ 426 F

1 Answer

I have 01 yz 426 and I cant figure out the timing. If the marks are lined up then the lobes on the intake cam are facing a different then ill the ones I see on youtube videos someone please help

Posted by Zach on

Ad

1 Answer

Gregg Mahin

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    One Above All:

    The expert with highest point at the last day of the past 12 weeks.

    Top Expert:

    An expert who has finished #1 on the weekly Top 10 Fixya Experts Leaderboard.

    Superstar:

    An expert that got 20 achievements.

  • Yamaha Master
  • 65,000 Answers

Hi, Zach 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.
yz426f cam timing Google Search
How to Install Hot Cam YZ426F
Yamaha YZ426F Owner Service Manual
OEM parts for Yamaha
Yamaha YZ450F Owner Manual Page 3

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

Posted on Aug 02, 2016

Ad

2 Related Answers

Anonymous

  • 11 Answers

SOURCE: how do i check the oil level and top up if needed on my yz 426 01

it might be under the seat take it off and chech to see if its under it

Posted on Jun 10, 2009

Ad

Anonymous

  • 13 Answers

SOURCE: yamaha yz 426 2002 set timing with crankshaft with

The spark will fire at top dead center and you can see it with a timing light or in the dark with the spark plug removed from the cylinder head but still connected to the coil wire and grounded against the motor (don't hold the plug or you will feel a shock, hold it by the rubber insulator.

Posted on Dec 28, 2009

Add Your Answer

×

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

How to disquinguish the intake cam from the exhaust cam,,mine got mixed up while doing a headgasket job .


the cam shaft may be identifiable but I doubt it as the lobes will be all the same .It may take a trial fitting of the cam shaft to determine which is which. Place the no 1 piston on TDC and install the cam in the exhaust side of the head. position a the no 1 piston cam lobe in the just closing position. Check where the timing mark will be in this position ( the engine make and sized would have been an enormous help here as the key position or timing mark on the gear would have revealed what cam it was). Place the other cam in the position where the no1 cam lobe is just opening.. This is called valve overlap and from the positioning of the timing marks will show if the cams should be interchanged . The marks will either both face down, face each other or face upwards. If they face out wards away from each other then interchange the the cams and if that makes the marks face each other then it may be right. Another way ( probably simpler will be to put a cam in place and the cam lobes will be directly in line with the rockers over the valves or directly over the valves. Workshop manuals are a big help when doing this work.

Oct 03, 2014 | Cars & Trucks

1 Answer

How do I line up my marks on cam shaft and flywheel to set timing


Hi mate didn't get any info on what bike you are timing but this procedure is simular for most and is specific for WR YZ 250 426 and 450

set piston to TDC (top dead centre) this can be done by spinning the fly around until you can see the (i) mark stamped on the flywheel line up with the marks on the inspection plug hole (engine case) good idea to probe the cylinder through the spark plug hole to confirm the flywheel mark is correct (I have seen several 426) where the TDC mark does not give accurate TDC on piston so worth second guessing this process.


once TDC is set do not allow piston to move from this point on - starting with the exhaust cam with no slack on the cam chain the dot stamped on the cam sprocket should align with the face of head with the cam lobes pointing outward roughly 45 degrees towards the front wheel when this in place

you do the same with intake cam except the cam lobe will face opposite direction outward and the should be a dot aligning to the head


double check before you go further that when you put your finger in the chain tension hole and you tension the cam chain that when all slack is taken from the cam chain that your dots on both cams align with head face and that you still have piston at TDC if all checks out then this is timed set correct so torque all the cam caps back up install chain tensioner and the recheck all fly wheel marks are in correct position and piston is at TDC and the dot on each cam sprocket aligns to the head if it doesn't then re do the process

don't be surprised if this takes a few attempts as it takes the best of us usually at least two attempts to get all marks to align correctly thats why best to check and double check before you bolt it all down then you can adjust just by lifting one cam out and moving one tooth either direction


You have little room to play with and when you start putting chain on the cam sprockets you will find very little extra chain length to play with you may need to wiggle tug and pull both cams together to get them back in each time but go slow and gentle they do go in they just need to be encouraged


I happy to elaborate on any point if you need - good luck

Regards Jamie

May 28, 2011 | Yamaha XT250X Motorcycles

1 Answer

Haw do you time the engine up on a wr426 2002 model


There is no real way to change timing on YZ except change the cam itself to YZ450 cam or simular etc If your wanting to find out how to re install the cams you have already and cam chain then it is simple process but sounds complicated when its written
set piston to TDC (top dead centre) this can be done by spinning the fly around until you can see the (i) mark stamped on the flywheel line up with the marks on the inspection plug hole (engine case) good idea to probe the cylinder through the spark plug hole to confirm the flywheel mark is correct (I have seen several 426) where the TDC mark does not give accurate TDC on piston so worth second guessing this process.
once TDC is set do not allow piston to move from this point on - starting with the exhaust cam with no slack on the cam chain the dot stamped on the cam sprocket should align with the face of head with the cam lobes pointing outward roughly 45 degrees towards the front wheel when this in place you do the same with intake cam except the cam lobe will face opposite direction outward and the should be a dot aligning to the head
double check before you go further that when you put your finger in the chain tension hole and you tension the cam chain that when all slack is taken from the cam chain that your dots on both cams align with head face and that you still have piston at TDC if all checks out then this is timed set correct so torque all the cam caps back up install chain tensioner and the recheck all fly wheel marks are in correct position and piston is at TDC and the dot on each cam sprocket aligns to the head if it doesn't then re do the process don't be surprised if this takes a few attempts as it takes the best of us usually at least two attempts to get all marks to align correctly thats why best to check and double check before you bolt it all down then you can adjust just by lifting one cam out and moving one tooth either direction
You have little room to play with and when you start putting chain on the cam sprockets you will find very little extra chain length to play with you may need to wiggle tug and pull both cams together to get them back in each time but go slow and gentle they do go in they just need to be encouraged
I happy to elaborate on any point if you need - good luck

May 24, 2011 | Yamaha WR 426 F Motorcycles

1 Answer

I have a yz426 and I replaced the timing chain worn. the problem is I can not remember the right position of camshaft. please help me for centering for the right intake and exhaust. thank you


the cams should face 10 and 3 with a 15 pin count on the cam chain pins from top marks on the cams the tdc mark make sure u turn it over by hand to make sure the motor is moving free

Sep 15, 2010 | 2002 Yamaha YZ 426 F

1 Answer

How do i set the timing chain on a 2002 yamaha


Line the (i) mark on the fly wheel to the inspection mark on the inspection plug hole then with both intake and exhaust cam lobes facing outward of the head aline the dots on the cams as best as possible to the top of the head it wont a line perfectly but will be pretty close - the timing on just about all YZ four strokes is exactly the same they all use this set up to install cams

Apr 19, 2010 | 2003 Yamaha YZ 250 F

1 Answer

Need to know the timing on a yamaha 450 yfz


make sure the pison is on top dead centre(look through the small timing plug hole down the bottom) There is a punch mark on each cam sprocket that aligns with the cylnder head surface. the cam lobes facing away from the lifters
Im trying to up load an image of the page in the manual
Comments: May 01, 2010- 95f339d.jpg hope this opens for you

Mar 15, 2010 | 2004 Yamaha YZ 450 F

1 Answer

How do you set the timing chain on a 2006 yamaha yfz 450


1st set piston at top dead center, which is the top of its travel. after you have verified top dead center, and you are 100% sure its at top dead, install the cams. first the exhaust cam, with you facing the sprockets, with the cam lobes facing up and away, about the 10 o clock position. once set there, you should see a refrence on the sprocket, with lines that will be parallel with the cyl. head surface. then install the intake cam, with lobes facing in the 2 o clock position. once again, you will see refrence marks on the cam sprocket that should be level with the cyl. head surface. after the cam caps are installed, and the cam chain tensioner, turn the engine with the flywheel bolt to verify you have no piston valve contact. after you turn over a few times, recheck timing.

Dec 23, 2009 | 2004 Yamaha YZ 450 F

3 Answers

Yamaha yz 426 2002 set timing with crankshaft with index marks done this and camshafts oppisite facing , cylinder head lined with cam wheels how do i tell which is the compression stroke as might be 180...


take the sparkplug out and crank it over slowly when air pushes out is usually a compression stroke stop when the piston reach's the top..spin it over 2-3 times make sure you feel air rushing out the sparkplug hole put your finger in the hole it should push your finger out .

Nov 19, 2009 | 2002 Yamaha YZ 426 F

1 Answer

Set the timing on yamaha yz 426 2002


Hi there Longhatx....Ok...Turn the crankshaft counterclockwise until the " I " mark on the rotor is aligned with the stationary pointer on the crancase cover.Fit the timing chain onto both camshaft sprockets and install the camshafts on the cylinder head.The camshafts should be installed onto the cylinder head so that the exaust cam sprocket punch mark " E " and the intake cam sprocket punch mark " I " align with the surface of the cylinder head,both marks facing out of course towards their prospective ports.thats about it .Please leave some feedback if this has helped . ride on.

Nov 17, 2009 | 2002 Yamaha YZ 426 F

1 Answer

How do you set the timing on a 1998yz400 i recived this motor with the cams takin out and dont know how to set them


the cams should say ex, int on cam sprockets if not the cam with 3 lobes for intake cam with 2 lobes exhuast, piston at top then set the cams with cam lobes facing outwards almost like a VEE there is i think a dot on each cam gear which must line up with the head. then turn the motor by hand

Aug 09, 2009 | 2001 Yamaha YZ 426 F

Not finding what you are looking for?
2002 Yamaha YZ 426 F Logo

Related Topics:

350 people viewed this question

Ask a Question

Usually answered in minutes!

Top Yamaha Experts

gbob59

Level 3 Expert

3063 Answers

Neil Lancaster
Neil Lancaster

Level 1 Expert

14 Answers

randymanfive

Level 3 Expert

501 Answers

Are you a Yamaha Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...