Discussion in '4-Stroke Engines' started by recumbentbill, Feb 7, 2010.

1. ### recumbentbillGuest

whats the valve clearance for the intake and ex valves

2. ### azbillActive Member

I have these saved as a txt file...can't remember where I got the info ???

Valve Clearances
Intake .08 mm +/- .02
Exhaust .11 mm +/- .02

Plug gap 0.6-0.7mm

hope that helps

3. ### recumbentbillGuest

thanks for the valve info.

4. ### darwinWell-Known Member

Remember to adjust on the cumbustion stroke TDC.

5. ### Quenton GuentherMotored Bikes Sponsor

Intake .003"
Exhaust .004"

Have fun,

6. ### Stan4dBanned

I take it that you are using standard while AZbill is metric?

7. ### Quenton GuentherMotored Bikes Sponsor

Correct,

There are many "feeler" guages in tool boxes and 99% are in thousands. So I thought converting to American numbers might be easier.

1 divided by 25.4 = .03937" X .08 MM = .0031" [.003"]
1 divided by 25.4 = .03937" X .11 MM = .0043" [.004"]

Have fun,

8. ### Stan4dBanned

I wonder....is there a post or thread that I have not found that converts metric to standard? I see post of horse power, then I see watts. I have no Idea what a watt power is when it comes to internal combustion motors. I see metric then I see standard. I am a product of a Education after the US Government got involved so this is a weak point for me.

Last edited: Feb 13, 2010
9. ### recumbentbillGuest

conversion chart

here you go

http://industrial-enclosures.com/html/conversion-mm-inch.html

11. ### Stan4dBanned

Thanks Quenton.

12. ### Stan4dBanned

sorry, did nto see this earlier....Thanks Bill

13. ### recumbentbillGuest

valve clearance according to Thatsdax

just noticed on Thatsdax . He shows a .002 clearance on both the intake and exhaust on a cold engine. I assume that the titan and HS are one in the same:detective:

14. ### Quenton GuentherMotored Bikes Sponsor

Hi recumbentbill,

The factory recommended settings are .11 MM & .08 MM.

I do think the Dax motors are HS.

I don't think it wise to set the valve clearance so close, and I won't be doing so on any of my motors. When I raced motocycles, ALL settings always had the exhaust valve with more clearance than the intake.

The reason is basic, the intake valve is slighty cooled by the incoming charge of gasoline. The cold gasoline helps maintain the length of the valve stem. The exhaust valve on the other hand gets really hot and expands causing the stem length to increase. I guess that is the reason the exhaust lifter clearance was always larger on my race bikes. If the exhaust valve stem length increases and set at .002" it could easily cause the exhaust valve to burn. And .002" on the exhaust would make me a little concerned.

Let us know how it works out for you.

Have fun,

15. ### azbillActive Member

he says they aren't !!!
it definitely looks like mine tho...except for the yellow

16. ### recumbentbillGuest

11 and 8 for me

I'll stick with the factory spec's. Every small engine and car engine I have adj the valves on the exhaust was allways had more clearance than the intake

17. ### MotoMagzMember

no top end

Help...Okay I adjusted my valves a little while back.Engine is smooth and seems to run fine at lower speeds.I have been messing with my gear ratios on the shift kit so I have not gone into the upper gears or taken her to the limits in a little while.

Anyway It won't go over 28 mph and seems to have no more power when I give her throttle.It is not my gear ratios...I had her in the upper 30's a few weeks ago. IS it my valves ? Did I adjust them wrong ? Any help would be great!

Thanx MotoMagz

oooh, conversion

1 hp= 746 watts.

1 PF(the german cousin to HP) roughly 1.1 hp...

farenheit to celcius. subtract 32, times 9, divide 5 'seasy

not so good on what a peck is exactly....hats off to peter piper

and yeah, standard valve clearance is .04-.05. you CAN go tighter if you grind your valves properly, measure when hot, and subtract clearance from the cold setting... not advised. you burn your fingers measuring

Last edited: May 17, 2010

Okay?? Next

MotoMagz

20. ### Quenton GuentherMotored Bikes Sponsor

Hi MotoMagz,

I always adjust valves when cold.

The settings on the HS motor are

Intake .00314" to .00393" or a very tight .004"

Exhaust .00433" to .00512" or a very tight .005"

If set to tight or too loose it will subtract power & RPM from the motor.

Have fun,