i have just bought a tzr 125 r import. its a bit tatty & had some fairing damage.it runs ok but seems to lack its full power, especially uphill.any ideas & restriction tips.?also it leaks oil ? from cylinder head near exhaust port.checked spark plug no oily deposits looks healthy firins.havint checked if need decokin.electric rev counter doesnt work.leaks oil by gear selector seal when going into 1st gear selector can be pushed a bit to far down.interested about any info about tzr125r or advice wish could get manual for it.does any yamaha use the same engine.