help,
well bobby, thats a bit of a weird one... firstly your trusty old xtz should be able to get you a long way over 70mph. not that you need to be told that.
i would probably start with a compression test of your engine, that would be the first idea, then check carby differences, ie jetting, internal mods,check the spark output to the plug...and perhaps the plug itself.... if all this is the same as your friends i would be surprised...
and perhaps check to see if you are running similar rear tyres, if you have a lower profile tyre this may effect its top speed...
very broad reply i know but.... difficult to say, but im betting your motor is a little down on compression compared with your friend bike, do they use the same amount of oil on long rides ?...phil.
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