To adjust a Yamaha’s valve, follow three main steps; namely, disassembling the bike’s parts, measuring the valve clearance and adjusting the valve clearance. The full process normally takes one to 1 1/2 hours to complete.
The first step of adjusting Yamaha bike valves involves a sequential order of part removal. The first part that you must remove is the fuel tank and meter assembly. Once these are out of the way, the carburetor assembly and spark plugs come next, followed by the ignition coil. You then need to remove the cylinder head covers, brackets and tappets. The camshaft sprocket covers, timing plug and straight plug are the last parts that exit the bike body at this stage.
Measurement of the valve clearance is the second step of adjusting a Yamaha valve. The objective when measuring the valve clearance is to align both the camshaft and front/rear cylinder to a position where the valve clearance can be measured via a thickness gauge.
Once this is done, the final step is manually adjusting the valves. You need to first loosen the locknut on the valve system, and then insert a thickness gauge into the space separating the adjuster and valve ends. The level of adjustment you need to achieve depends of the three-digit number on the valve pad, according to R6 Message Net. Turning in the adjuster reduces the clearance space of the valve, while turning it out increases this space.