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Just put a new valve in a yz 426 and now the cam has zero clearance with a shim or not any ideas

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  • Motorcycles Master
  • 511 Answers

Hi the shim needs to dr measured and replaced with a thinner one to achieve the required clearance.

Posted on Apr 16, 2015

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Posted on Jan 02, 2017

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SOURCE: yz 426 wont idle, backfires and bogs out

Hello phwolfe,
Did not backfire but , boged out appling fuel. Found it was flooding because
the floats were over filling the chambers. Adjusted float settings (by eye )
problem solved !! Keeping the chambers 1/2 to 3/4 full worked for me.
My Bike is a 1983 Midnight Maxim 653cc. 4 Cylinder. Maybe yours is fuel injected ?

Best of luck !!

Ron



Posted on Mar 18, 2009

  • 1 Answer

SOURCE: TROUBLE STARTING BIKE HELP

1. Remove the plug from the cylinder.

2. Put the plug wire cap on the removed plug.

3. Have a buddy push down several times on the kick starter
while you look at the end of the plug for a spark.

This works best in a dim or dark garage.

Posted on Mar 20, 2009

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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

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SOURCE: 04 crf 250r.... the head has a chattering noise when running

Any chance the valve spring has collapsed? Cam shaft thrust washers missing? Cam shaft bearing gone bad?
abe5193.gif b3c3550.gif Please rate this solution. Thanks!

Posted on Jun 22, 2009

Nickinfuts
  • 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

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1 Answer

Correct valve clearance for 2002 yz426


Hi, Mufasa124s 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.
Valve Adjustment on 2002 YZ426F YZ 400 426 450
How to check valve clearances and how to shim them PART 1 Watch in HD
Yamaha YZ426F Owner Service Manual
OEM parts for Yamaha
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Aug 22, 2011 | 2002 Yamaha YZ 426 F

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Valve clearances for 2001 yamaha yz426f


.10 - .15 mm - intake and .20 - .25 mm exhaust is the standard clearance range for YZ

Nov 23, 2010 | 2002 Yamaha YZ 426 F

1 Answer

I need to know the valve adjustment procedure and


Valve clearance ideal setting is 0.10mm however as ideal replacement size shims are not always available use tolerance 0.05 to 0.2mm inlet and exhaust Procedure remove tappet cover rotate motor to tdc compression (inlet valve lobe pointing to rear wheel and exaust lobe to front wheel) measure clearance if no clearance depress cam bucket hold down by wedging a screwdriver or suitable tool (allen key) between cam bucket and cam remove shim measure with micrometer an relace with a shim 0.15 thinner depress valve remove wedge and measure clearance (if any) repeat procedure 4 each cylinder if clearance to large replace shim with a thicker one till clearance is in spec

Jul 20, 2010 | 1981 Suzuki GS 750 L

1 Answer

What is the right valve clearance for a 1979 suzuki gs850 i had to replace the head and cams but the shims are not in the head how do i check the clearance and at what cam position do i check them at


You need to put the shims in and fit the camswith all the caps and bolts on.
Then measure between the cam lobes and the shims with a feeler gauge, when the cam lobes high point is away from the shim bucket.
and write down all the measured clearances.
Then remove the cams and fit the correct thickness shims to get the clearance correct.
Fit the cams again and check, this can take a couple of tries if there were tight clearances in the first instance.
either fit the cam chain up each time to do both cams or make sure the pistons are only half way up the bore and do one cam at a time, to make sure the pistons and valves dont say hello.
cant help with exact clearance but a kawasaki 750 is 3-7 thou which will be pretty close as the shims let you adjust 2 thou at a time
ie if the measured clearance was 2 thou you would need a thinner shim to adjust the clearance to 4 thou

Jul 15, 2010 | Suzuki GS 750 Motorcycles

1 Answer

2003 yamaha 250yfm valves are noisey and started


Valves are adjusted by changing the the shims to thicker or thiner ones.
measure all the clearances and write them down, remove the cams and remove the cam buckets of the ones that need adjustment. Note the sizes of the shims removed( it is etched onto them) and replace with different thickness shims to bring them back into tollerence.

Make some marks and notes on the cam timing before removing cams,even take a photo(or that will be your next question) .
valve clearances usually close up( dont get noisy) and valve clearances wont make it smoke, so there may be more maintenance to do, like a cam chain and rings. Im not certain about a yfm, but you posted with a picture of a 2 stroke which doesnt have valves to adjust

Jun 20, 2010 | 2003 Yamaha YZ 250

1 Answer

Need valve clearences for all valves...


0.0039-0.0059 inch 0.11-0.15mm inlet cold
0.0079-0.0098inch 0.2-0.25mm exhaust

measure and record clearances before removing cams, then will need to get exchange shims if clearances need adjustment, the shims have the sizes etched on them , do not mix them up

Apr 04, 2010 | 2002 Yamaha YZ 426 F

1 Answer

Need valve clearances for 2000 YZ426F


Hi, Jimmulc 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.
2000 YZ426 FM Valve Adjustment NOT 2001 YZ426FP Valve Chart YZ 400 426 450
How to check valve clearances and how to shim them PART 1 Watch in HD
Yamaha YZ426F Owner Service Manual
OEM parts for Yamaha
Yamaha YZ450F Owner Manual Page 3

Feb 18, 2010 | Yamaha YZ 426 F Motorcycles

3 Answers

It will not start and it backfire after valve adjustment. did i put the cams back the wrong way?


did u hav piston @tdc power stroke-valves shud slightly clic with ur hand after ajust-mite hav performed it at exhaust stroke! let me know

Jan 26, 2010 | 2002 Yamaha YZ 426 F

1 Answer

Dos the inlet shims wear faster than the exhaust one and is there a gragh to help with repacements


The shims dont wear, the valves do. You need to measure, and see what you need and order the new size shim, or get a "kit" with various shim sizes, as these are available aftermarket.

Aug 01, 2009 | 2002 Yamaha YZ 426 F

1 Answer

Rattle in top end


Have you adjusted the valve lash lately?
With engine COLD....
Valve Clearance Intake: 0.11 - 0.15mm ( = 0.004 - 0.006")
Valve Clearance Exhaust: 0.16 - 0.20mm (= 0.006 - 0.008")
29mm shim kits with a wide range of sizes are available from aftermarket dealers. (motion pro shim tool works great)
Also a weak valve spring will cause the valve to "float" and make a rattle noise...as well as excessive camshaft end play.
Make sure your valve train is getting proper lubrication.
Good luck....i hope this helps

May 25, 2009 | 1981 Yamaha XJ 650

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