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Different clearances when measuring valves?

  • Thread starter Thread starter Fenixgoon
  • Start date Start date
F

Fenixgoon

Guest
Just a quick question really -I measured my valve clearances two ways:
1) the cams are perpendicular to the shim surfaces
2) the cams are vertical

For the most part, they matched up perfectly fine. In two instances, there were huge differences:

Cyl3 intake (perpendicular): 0.1-0.15mm
Cyl3 intake (vertical): 0.04-0.05mm

Cyl4 exhaust (perpendicular): 0.04-.05mm
Cyl4 exhaust (vertical): 0.1-.15mm

Any particular reason why this would happen? Which measurement is "right"? Everything else went ok, so my new shims will be on their way soon :)
 
The right way is when the lobes are pointing directly opposite the surface of the shim.
 
uudfourty said:
The right way is when the lobes are pointing directly opposite the surface of the shim.
Click to expand...

Sorry but no. The cams must be in the Suzuki specified position or the adjacent valve will be compressed which will skew the cam in the journal clearance, thus leading to improper valve clearance measurements. All valves are adjusted in pairs for this reason.

#1 E lobe pointing forward, parallel to gasket surface: check 1E and 2E
#4 E lobe pointing forward, parallel to gasket surface: check 3E and 4E

#1 I lobe pointing up, perpendicular to the gasket surface: check 1I and 2I
#4 I lobe pointing up, perpendicular to the gasket surface: check 3I and 4I
 
Last edited:
Nessism said:
Sorry but no. The cams must be in the Suzuki specified position or the adjacent valve will be compressed which will skew the cam in the journal clearance, thus leading to improper valve clearance measurements. All valves are adjusted in pairs for this reason.

#1 E lobe pointing forward, parallel to gasket surface: check 1E and 2E
#4 E lobe pointing forward, parallel to gasket surface: check 3E and 4E

#1 I lobe pointing up, perpendicular to the gasket surface: check 1I and 2I
#4 I lobe pointing up, perpendicular to the gasket surface: check 3I and 4I
Click to expand...

so basically i need to redo all my measurements?
 
Is it the same way with shimless valves? IE adjusting nut & bolt?

When I adjusted my 8 valve twin, I just set the valve lobe opposite of the valve and adjusted it. I don't see how that's going to be a problem.
 
On the 8-valve twin, that might not make a difference.

It took a while for me to realize why the specified lobe orientation on the four-cylinder bikes, but it now makes sense.
When the lobes are set the way Nessism detailed, neither cam lobe on that side of the engine is pushing on a valve. This ensures that the cam is in a rather neutral position and not being distorted by the pressure of opening a valve. It also makes it a bit quicker. Set the cams once, measure two valves.

.
 
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