GStwin.com GS500 Message Forum

Main Area => General GS500 Discussion => Topic started by: knowles on May 07, 2012, 08:47:04 PM

Title: Valve shim help
Post by: knowles on May 07, 2012, 08:47:04 PM
I know this has been beat to death but i checked the valves and i had the following measurements.
left exhaust valve    -.076mm fit .102 no fit
right exhaust valve  -.038mm fit .051 no fit
left intake valve      -.038mm not fit
right intake valve    -.038mm fit .051 no fit

was going to leave the left exhaust valve,
change right exhaust valve, and right intake valve to 2.20 or 2.25
change left intake to 2.15 or ?
i had 2.60mm in both exhaust valves, 2.65mm in both intakes

i have a 89 with about 26,000 miles

It my math right?
Title: Re: Valve shims
Post by: knowles on May 07, 2012, 08:54:47 PM
also is that getting to the point that i would have to replace the valves themselves or the buckets, i think im getting to the point that i won't have much adjusting left.
Title: Re: Valve shims
Post by: Paulcet on May 07, 2012, 09:09:39 PM
No, your math isn't right.   Line up the decimal points and do it again.
Title: Re: Valve shims
Post by: knowles on May 07, 2012, 09:26:24 PM
  2.60
- 0.38
=2.22
Title: Re: Valve shims
Post by: Paulcet on May 07, 2012, 09:27:48 PM
0.38 != .038
Title: Re: Valve shims
Post by: adidasguy on May 07, 2012, 09:36:40 PM

  2.600
- 0.038
=2.562
Title: Re: Valve shims
Post by: knowles on May 07, 2012, 09:38:02 PM
man thats sad :oops:
I'm suppose to be good at math
Title: Re: Valve shims
Post by: knowles on May 07, 2012, 09:49:26 PM
ok now that i feel like an ass :cookoo:


should i leave the left exhaust at .076 was snugg but it did fit, or should i try to make both around .1?

Shims to order
2.55 on the right exhaust

2.50 on the right intake
2.55 on the left intake
or is it better to do the intakes the same, right intake was so tight that the smallest feeler gauge that i had won't fit. that is why i was going to go .05 smaller or should i go smaller yet?
Title: Re: Valve shim help
Post by: knowles on May 07, 2012, 10:18:05 PM
jesus christ on a crutch, ok i did it totally wrong, what is the ideal clearence for exhaust, and intake? is it .1 on exhaust, and and .07 on exhaust.
then i should take the measurement that i got and - it from the ideal then - that number from the shim that is in there to get the new shim thickness.
so.038-.070=.032
.032-2.60=2.568
so in this case i would order a 2.55 shim.

now did i do that right?
guess i can't do math in my head.
Title: Re: Valve shim help
Post by: Juan1 on May 07, 2012, 11:03:34 PM
http://gstwins.com/gsboard/index.php?topic=59063.msg673192#msg673192

Popular around here:
.03-.08mm Intake
.08-.13mm Exhaust

I'm presently at
.03mm In 1
.05mm In 2
.10mm Ex 1
.14mm Ex 2
Title: Re: Valve shim help
Post by: slipperymongoose on May 08, 2012, 01:32:30 AM
I rekkon leave your one valve as it and nearly .08, try and open up you other exhaust to near the same, and open up your intakes to round .05
Title: Re: Valve shim help
Post by: bombsquad83 on May 08, 2012, 07:36:16 AM
Quote from: knowles on May 07, 2012, 08:47:04 PM
I know this has been beat to death but i checked the valves and i had the following measurements.
left exhaust valve    -.076mm fit .102 no fit
right exhaust valve  -.038mm fit .051 no fit
left intake valve      -.038mm not fit
right intake valve    -.038mm fit .051 no fit

was going to leave the left exhaust valve,
change right exhaust valve, and right intake valve to 2.20 or 2.25
change left intake to 2.15 or ?
i had 2.60mm in both exhaust valves, 2.65mm in both intakes

i have a 89 with about 26,000 miles

It my math right?

One size (0.05mm) down on right exhaust and one size down on left intake.  So, move a 2.60 mm from your right exhuast to your left intake, and then get a 2.55 mm for the right exhuast.

Then hand crank it clockwise a few times and recheck.
Title: Re: Valve shim help
Post by: knowles on May 08, 2012, 11:08:45 AM
ok going to order 2 2.55, and maybe 2.50 to use to check the right exhaust. thanks guys.