The CB1100 Community Forum

Since I have joined this forum I have seen numerous threads and posts relating to valve clearance. There has been much discussion on how to, when, or even if this check is even necessary. What I would like to do is keep this thread constrained to OBSERVED VALVE CLEARANCE and avoid ANY discussion other than that. Model and mileage? Yes. Previosly shimed? Might be useful. Vin number? Up to you. I would rather you did not post comment on the oil you use, where the best burger in Peoria, PA can be found, or wether your mother-in-law rides a Road King. However I am a realist, if you really must, go ahead.

Model: '10.

Clearance specifications:


EX: 0.28 +/- 0.03 mm (0.011 +/- 0.001 in)

IN: 0.15 +/- 0.03 mm (0.006 +/- 0.001 in)


Mileage: 74000kms (46000miles) .

Previously shimed? Yes at 12000kms (8000miles).

The first number is the left side valve of the pair.


OBSERVED CLEARANCES

Cylinder #1

EX: .28 mm .28 mm

IN: .16 mm .12 mm


Cylinder #2

EX: .26 mm .26 mm

IN: .14 mm .13 mm

Cylinder #3

EX: .27 mm .28 mm

IN: .16 mm .13 mm


Cylinder #4

EX: .26 mm .26 mm

IN: .15 mm .18 mm


Cheers

All mine were exactly at the middle of the specification, based on my "feel" developed over the years. None tight, none loose. Just enough drag on the feeler gage to make me happy.

Done at just over 8,000 miles or ~13,000 km.

Looks like yours are all within spec now, but could you post what they were at the first adjustment and which ones were shimmed?

Conclusion could be that some require shimming at the first service but once "worn in" they tend to hold the adjustment well.

I cannot go along with the idea that this should be ignored. Yeah, it's a day's work but it's a machine, it can wear out or break. Better to be safe than sorry.

I do think knowing the type and grade of oil would also be relevant so I fell compelled to state this. 10W40 from the first change.

Model: 2013
Mileage: 17,000kms
Previous Adjustment: No.
Result: 11/16 valves perfect or within .01mm of spec. 4 exhaust valves and one intake at .02mm looser than spec. No adjustments required.

Observed:
1: E: .28, .29 I: .15, .15
2: E: .30, .29 I: .15, .16
3: E: .30, .30 I: .17, .15
4: E: .30, .28 I: .16, .16

Ptero: Assuming you shimmed them back to middle spec at first service, that's definitely not that much movement in 60K.

Your exhaust is almost exactly where mine were at the first check at 9,500 mi. The intake side for some are a little tighter. (Mine were all at .15 with some maybe +.01). Tony, do you think the techs really did anything first go around? I know you were a little disappointed in their work on other fronts.

(06-24-2016, 02:59 AM)DAC_imp Wrote: [ -> ]Your exhaust is almost exactly where mine were at the first check at 9,500 mi. The intake side for some are a little tighter. (Mine were all at .15 with some maybe +.01). Tony, do you think the techs really did anything first go around? I know you were a little disappointed in their work on other fronts.

All I can say about the first major service (12000kms) is that it was done at a large dealership and they charged me for valve adjustment and shims. They couldn't provide detail.

Cheers

Fair enough. I will most likely go back in for another check at 20K mi. That should be about 2 years. If they're still in spec, I'll be done checking valves.

I'm not particularly proud of this fact but it is another data point. I was checking my valves every 8,000 miles up to about 24,000 miles and didn't see any perceivable change at all. I now have about 54,000 miles on it and I probably won't check them again until the cam cover gasket starts to leak or I start worrying about it too much. The bike still runs like new.

dealer performed 8000 mile service on 2014 cb1100 dlx.
Clearance specifications:
EX: 0.28 +/- 0.03 mm
IN: 0.15 +/- 0.03 mm
Observed:
1: E: .28, .27 I: .14, .15
2: E: .26, .28 I: .14, .16
3: E: .27, .29 I: .15, .16
4: E: .29, .28 I: .16, .14
no adjustments needed or done.

Mileage: 61,428 miles (98,285 km)

#1 - exhaust .30,.30 intake .15,.15
#2 - exhaust .30,.30 intake .15,.15
#3 - exhaust .28,.28 intake .15,.15
#4 - exhaust .28,.28 intake .18,.18

No adjustment needed.

I don't see anything getting tight so I'll probably go another 36,000 miles before I check them again.

Just did mine at my dealer with 8300 miles on the clock--- all within spec, mechanic suggested waiting 16K more miles before checking again