The spark plugs do last a longtime, in the UK its 15000 miles to change them (24000km) and even then they look OK and could easily go 20-25k miles. But if you've went to all the trouble to remove tank etc you should replace them. At 38000km (23000miles) you'll be close to needing the valves done, I needed all four exhaust valves done at 30k miles (two exhausts tight, two on minimum, all inlets on minimum). Getting it all done now would mean not having to look at it again till your at 70000km.
Hi
I want to do this job, but it scares me a little.
I`ve done some valve check and adjustment jobs, but, in other kind of engines.
Lot of times in my old Mercedes W123 300D, with OM617 engine, plenty of room and gap adjustment by screw.
Also, some years ago, this service was done by myself in my old Bandit 600, SACS engine, same system to gap adjust.
I have not done adjustment in V engine and with pad system.
Anyway, my previous Bandit 650 k7, that I sold with 97000 kms, valve service was NEVER done, and the engine was healthy and plenty of power and response.
But, It`s a necessary job, and the Suzuki dealer from my area is not very reliable, so, I will do the job soon.
Lot of thanks for the info.
REgards