Re:89 Suzuki LT250 Quadrunnner.......valve adjustment
Have you done a compression check? At sea level standard 142-199psi. Service limit 114psi. Do that first. If you want to check valve clearance... intake 0.3-0.8mm (0.001-0.003 in) exhaust 0.08-0.13mm (0.003-0.005 in). There are valve adjuster caps, one on each side of the cylinder head. 17mm wrench and remove the caps to adjust.
The manual does not recommend doing your own service on the valves as it takes lots of special tools and experience. If adjusting doesn't work out take the whole cylinder head to the shop.
Hope this helps.
700 King Quad
07 king 700 camo/VDI/M109R/Warn XT30/Hid's/DJ Castor Mod/Grease Mods/Steering Stabilizer/Highlifter Springs/Oil Pressure Light/Warn Backup Light/Tony James 3+ 1mm shim/OEM aluminum skids with UHMW/Shift Gate mod/JT Temp Gauge/Wix inline fuel filter/Twin Air/Moose 5 stage Grip/Thumb Warmers/27" Zilla/25"Terracross/Elka Stage III