I am a mature (age) newbie, licenced 2 months, riding a Suzuki GS500 (Dec 200 naked bought privately in Sep 2011. I've added about 4000km so it has now just over 30000km. I have the Haynes service manual plus reading as widely as I can to learn about my bike by doing my own scheduled maintenance. I am not an experienced mechanic but I have done plenty of basic car servicing and have tools, so I am carefully following the Haynes instructions. But there is something there that is freaking me out, so I want advice before I do anything stupid!! The official Suzuki maintenance schedule says to "tighten" the cylinder head nuts at 1000,6000,12000,18000,24000 km and I assume avery 6000km after that. But it does not give detailed instructions. The Haynes manual goes into more detail: "The cylinder head is secured by eight 10mm domed nuts .... Slacken the nuts evenly and a little at a time in a reverse of their numerical sequence until they are all slack. Using a torque wrench, tighten the domed nuts evenly and a little at a time in numerical sequence to 35 to 40 Nm." The Haynes manual clearly says to do this every 6000km/12months. Now this intuitively seems to go against what I know about heads and gaskets on cars, eg if you loosen the head on my car it must be checked and machined for straightness, and reassembled with new bolts and gasket. Fully loosening the head nuts seems to me to be just asking for trouble. What do folks here think of the Haynes instructions to fully slacken off the head nuts and re-tighten every 6000km? Would you do it? If I took it to a dealer service dept, would they do this?