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Gap clearance on valves

Want to adjust valves

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Please tell s what the make and model of your bike is as clearances differ vastly

Posted on Apr 15, 2015


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Power pro generator 5500 kicks back when I try to start it and almost breaks my wrist. How do I fix it?


If you find that the unit is kicking back or backfiring it could be that the engine has settled in and the Valve clearances need adjusting.
Your engine a system of moving parts, and moving parts wear. When you adjust a valve, you're not adjusting the valve itself but compensating for that wear, letting the valve open and close as efficiently as possible.
The first step is to pull the engine's Rocker Cover off (aka Valve Cover). This is at the top of your cylinder head and covers your Rockers, springs and the stem of your Valves. If you need help identifying these parts, see the parts page for your unit on this web page:
Although rockers and shafts add complexity, valve adjustment there is easy. Each rocker arm adjusts the clearance to the top of the valve. You rotate the engine until that cylinder's piston is at the top of its stroke-a.k.a. top dead centre-and each of the valves are fully closed, the springs uncompressed, the system at its loosest.
Then stick a feeler gauge between the valve stem and the adjuster to check the gap. Too large a gap, you get clattery valves, the linkage taking up the slop. Too small, you run the risk of valve damage.
You need to adjust your valves:
Intake: 0.015" (0.381mm)
Exhaust: 0.015-0.020" (0.4-0.5mm) (Try smallest setting first. If still not running right, change clearance to 0.020".)
A good example of how to do this can be seen in the below YouTube video. The only difference is you need to rotate the recoil to find the "top dead centre."

If you need any further help, please contact us again. :)

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1 Answer

Valve clearance Briggs model# 331877 1371b1

Danny, I set lash at .004" / intake and exhaust clearance. Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
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How do I set the timing

Are you trying to set the ignition or valve timing ? The ignition timing is factory set and changes with engine rpm - you can set the air gap between the flywheel and the ignition unit which should be around 0.25mm (0.010") Excessive air gap will retard the ignition timing. Unless you\'ve had the engine apart, the valve timing won\'t need re-setting. The valve clearances will need setting from time time and the clearance between valve and rocker is 0.1mm and is adjusted with both valves closed and piston at the top of it\'s stroke - you should replace the gasket and copper washer at the same time.

Apr 04, 2014 | Stihl HT101 Pole pruner

1 Answer

Valve clearance

are the valves adjustable some of these small engines valves are just pre set and when the seats and valve wear this causes the valve to sink further into the head closing the gap and in time stops the engine from running a quick fix is to grind the top of the valve stem slighty

Mar 06, 2014 | Garden

1 Answer

Noise like valve adjustment too loose. how do I adjust valve clearance? thank you.

Valve adjustment is not a simple task, the valve clearances will need "shimming" these are thin pieces of metal to take up the gap or slack between valve and rocker arm. You will need service manual and some feeler gauges, and purchase a set of shims

Jul 05, 2011 | kawasaki VN 1500 Vulcan Classic...

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Hi, can you help me?? i am looking for the valve clearance gaps for a 2008 honda cbx 250 twister. my current gaps are, ex = 0.10mm and , in = 0.12.... please help, it doesnt sound right

Your valves are adjusted backwards. Most Honda's will use: IN = 0.10 mm ( 0.004 in ) and EX 0.12 mm ( 0.005 in ) A simple adjustment should take care of the problem.

Oct 15, 2010 | 2001 Honda CBX 250 TWister

1 Answer

How do i set the valve clearances and points on my 1971 honda cb250?

I would consult and owners manual for procedure and correct gap setting..after finding the correct gaps, you would need to pull the valve cover , position the timing mark as described in owners manual then losen and adjust valves.

Oct 23, 2009 | 1972 Honda CB 250

1 Answer

GOOD DAY, Dear friends, can somebody help me with adjusting the valves gaps of Honda VT 500C. What is the proper gap? How exactly the valves can be adjusted? Thank you in advance!

Your valve clearances should be:
Intake .08-.12 mm (.003-.005 in)
Exhaust .12-.16 mm (.005-.006 in)
I usually start all gaps in the middle of given specs, then fine tune from there.
Hope this helps

Jul 10, 2009 | 1984 Honda VT 500 C Shadow

1 Answer

Im adjusting the tappits on the motor

They're not tappets--you can adjust them with a wrench and a set of feeler gauges. Here are the clearance measurment numbers for intake and exhaust:

  • 0.08mm - 0.13mm for the intake valve clearance
  • 0.11mm - 0.16mm for the exhaust valve clearance

There is much more helpful information on this web page:

Click on the link "How do I adjust the valves?"

You will also find lots of valuable information on your GPX 250 (called a "Ninja 250" or "EX 250" in America) on this web site:

Good luck!

Nov 27, 2008 | 1989 kawasaki GPX 250 R

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