Hello my little TDR seems to max itself out at 50mph, surely it should at least be doing 60-70mph any advise appreciated. ta

Check the oil levels.

If the engine's low on oil - maybe you even changed it recently and flushed the system out with petrol, what happens then is the oil level drops much quicker than you think.

Then the engine runs too hot and bits start grinding. Change oil and use EXACTLY the right quantity.

Hopefully there'll be little or no permanent damage.

Don't keep running it if it IS the oil, till you've changed it, my college tutor explained how this F***S the engine up it's not nice.

Otherwise you need to check sparkplug / timing???\

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Good luck

cheers mate, done that but now stuck at 35-40, really banging my head against the wall on this, e-mailed Yamaha for a workshop/service manual and because it's an import one doesn't exist in english, don't you just love these little challenges life throws at you?!?