Hi Drifty ! I was thrilled to know that things like "valve clearance" could be attempted by a common biker,when i came across your DIY.I got confident
enough to attempt it on my own,but got stuck at the very first step.The valve covers are so tight on my TVS Apache fi rtr 160 that i fear the bolt threads
have been damaged.First i used 17mm ring spanner to open inlet valve cover,but some metal scraped off in the process.Then i used open ended 17 mm
spanner in its place & some more metal scraped off.I then attempted to open the exhaust valve cover & the same thing happened again.I doubt if i
would be able to open it ever again.What should i do now ? Please help !!!...I have also attached pics...