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Valve adjustment on the fence.

  • Thread starter Thread starter TheCafeKid
  • Start date Start date
T

TheCafeKid

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Ok this is my first solo job checking these..so i need a lil reminder/refresher help.


This motor 8v GS750 motor. spec is .03mm to .08

Exhaust side, gauge goes smooth in till .06mm then its tight on all cylinders

Intake side, 04 is a lil tight on all of em...03 would probably slide in (my feelers only go to 04) You think im ok on my intake side or should i replace them all now?
 
TheCafeKid said:
Ok this is my first solo job checking these..so i need a lil reminder/refresher help.


This motor 8v GS750 motor. spec is .03mm to .08

Exhaust side, gauge goes smooth in till .06mm then its tight on all cylinders

Intake side, 04 is a lil tight on all of em...03 would probably slide in (my feelers only go to 04) You think im ok on my intake side or should i replace them all now?
Click to expand...

It won't hurt to change them out to the next shim size. I would. Either that or get the right feeler guages and make absolutely sure that they are within spec.
 
I also could swap sides with the shims provided the intake ones would still keep the exhaust side in spec right?
 
TheCafeKid said:
Intake side, 04 is a lil tight on all of em...03 would probably slide in (my feelers only go to 04) You think im ok on my intake side or should i replace them all now?
Click to expand...

exactly my situation, was just about to post the same question! :shock:
would be interested to hear what other people have to say
thanks for posting this question
 
Ive heard say that the intake will tighten faster than exhaust anyway...So i like you shall await an answer... Yeah I SHOULD just replace them all now, while i have the SOB open and it isnt going anywhere anytime soon, but im just curious.
 
TheCafeKid said:
Ive heard say that the intake will tighten faster than exhaust anyway...So i like you shall await an answer... Yeah I SHOULD just replace them all now, while i have the SOB open and it isnt going anywhere anytime soon, but im just curious.
Click to expand...


You just answered your own question.:-D
 
Tck, try the next thinner shims on the intake side and measure your clearance again. If it is still in spec, go with thinner shim. If the clearance is too great, over 0.08mm, go with original. Per spec is good enough.

You are correct in thinking more clearance is beneficial since they wear tighter but this usually takes a few miles. Unless you are blessed with great luck, or have a large stash of shims, I usually have to compromise and go with some that are marginally out of spec, larger clearance always.
 
I'd leave the exhaust side alone. Go one down on the intake.

Is mine the only Suzuki dealership left that swaps shims for free?
 
Yes... mine charges 5 bucks for exchange. Z1 is cheapest.....

I would swap out the intakes too as .09 should be ok & if you have .03 you'll probably have to swap them in 2 or 3k anyway....

Your other option is to get them ground down on a flat table grinder... there is one guy here that does that. Perfect valve setting every time then.

I managed to find enough "X" shims to get all mine set to .06 last time... :)

By the way, are you using factory manual method rather than Lobe at 90 method? They give different results.

Dan :)
 
I had the lobe flat...like i was told to do...which is the better way?
 
OH all the dealerships round here have heard of them

Usually goes
"12.99 each and we'll have to order them"

Then i call Z1
 
Yep, lobe flat to casing. Someone posted pics from the manual on my valve adjust thread. Do a search you can print them out. Think it was Nessism that posted them. Dan :)
 
One of the local dealerships will swap shims but all they have are 2.70 and up, about worthless. At a boneyard, I went with my micrometer and spent better than 20 minutes looking through a coffee can full of kawasaki and suzuki shims to find a 2.60 that I needed. Found one, needed two; used a 2.55x to get close. Paid $5 for the pair. Don't think will do again however.
 
bwringer said:
Yours is the last Suzuki dealership that has even heard of shims.
Click to expand...

TheCafeKid said:
OH all the dealerships round here have heard of them

Usually goes
"12.99 each and we'll have to order them"

Then i call Z1
Click to expand...

waterman said:
One of the local dealerships will swap shims but all they have are 2.70 and up, about worthless. At a boneyard, I went with my micrometer and spent better than 20 minutes looking through a coffee can full of kawasaki and suzuki shims to find a 2.60 that I needed. Found one, needed two; used a 2.55x to get close. Paid $5 for the pair. Don't think will do again however.
Click to expand...

Both the dealerships in Reno and Carson City have buckets full of them! They have Kawi and Yamaha ones, too! Both shops have been around since the 60's, so that's probably why.
 
Mr. TheCafeKid,

I documented one of my valve adjustments on my little BikeCliff website. If I'm reading it right, the Suzuki shop manual says to put the #1 exhaust lobe forward at 90 degrees (parallel to the top of the head) and check #1 and #2 exhaust clearance. Put the #4 exhaust lobe forward at 90 degrees and check #3 and #4 exhaust clearance. Put the #1 intake lobe straight up (perpendicular - at a right angle - to the top of the head) and measure intake #1 and #2 clearance. Then put the #4 intake straight up and measure #3 and #4 clearance.

If my .04mm feeler gauge was too tight or wouldn't fit, I changed the shims (I don't have a .03mm feeler gauge). The "X" sizes do come in handy for really "dialing in" your clearances. A digital caliper is good to have to make precise measurements of the shims.

My bike ran so much smoother after swapping out 5 shims. I guess it had been a while since the valve clearances had been checked. I bought "Jessie" with 13,800 and never knew if she'd ever had a valve adjustment. Another one will be due at the next oil change.

Thank you for your indulgence,

BassCliff
 
Yeah i figured this thing was probably going to need it, but the exhaust are right in the middle of spec, so i dont think i'll mess with those. My intakes ALL are tight at four. It goes in, but not easy. Im on my way down to pop em out and see what im looking at for replacement.
 
ROOIT!! Lil help here boy'os! Catalogued all my shims on both sides, hoping to do some swapping..

Exaust as i said is nice up to 06 save for one is tighter than i first got when gaugeing them. THREE felt a lil tight. But here's the run down, someone tell me if im correct when i say what im going to do...

Intake side

1- 2.75 2- 2.80 3- 2.80 4-2.75

Exhaust side

1- 2.8 2-28 3-2.75 4 2.65

Here's the plan stan....

All intake sides, going down one whole size respectively.

Exhaust side.... as i said all are clear to 06 minus number 3. SOOO

move shim from 3 (2.75) to four and fours to three...will that work??

Not trying to be cheap, but would be nice to not HAVE to buy a shim if i got one sittin here.
 
AND someone please explain to me why the BOOK says measure with the lobe up rather than flat?
 
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