High-G FJR Junkie!
Join Date: Jan 2013
Location: Millgrove, ON, CA
Yes, there are bikes with 16k, 20k and 22k intervals.... what one doesn't want is a valve going below minimum clearances... that is the tendency under normal circumstances. Minimum clearance is meant to ensure valve will fully close, and while I believe there is a small little safety factor in there, you don't want "too small". First check tells you where you are. For an FJR, 26k is safe, so no need to panic over going beyond that.
Under minimum means risk of burning an exhaust valve. Intake run cooler due to inrush of air, but will run poorer due to not sealing/lower compression.
The clearances grow only if carboned up, no real danger to valve except carbon is hard to remove. Intakes affected, exhausts run hot so much less carbon on the valve seats. Valve again doesn't seal, low compression, running issues, or won't start eventually (especially when hot when all metal parts are expanded to max).
What I have seen....... Yammy puts them in spec at the factory based on an assembly line... most not perfect, some near minimum, some larger. My guess at 30-40k is everything is seated and a couple can be now at minimum. Never found an underspec yet, but have found some at minimum. Simple, first check is the one you'll find the most wear, can be around 0.001". No big unusual wear occurs.
Record all readings at every check, subsequent check tells trends if the same guy measured and recorded. To not worry about second check, shim all to the larger side.
OK, rare event..... checked an 2012 FJR with 94k, never had a check in its life. All were at nominal... nearly crapped myself.
If you go to a dealer or bike shop, have them record and give you the actual readings, and if they adjust, as a bonus, what was original shim size, what was the new shim size. Just asking IMHO makes them be a little more precise than "all were within spec". Shows them you care about your bike, and they may just care a little more.
Keep yer stick on the ice....
2014 FJR1300A - Root Beer (sold)
2009 CBF1000A - Sienna Red
1999 VFR800Fi - Pearl Shining Yellow