After reviewing a lot of posts and other helpful info I have a question. With the top ends on 250 and 450 four stroke racing dirtdikes lasting 30 to 60 hrs before requiring top end surgery, how long would one expect a K6 to live, on a mix of `spirited street` and 4-6 track excursions per year, without requiring some expensive repairs? I am aware that the singles noted live at max load and high rpm all the time under race conditions, but trail riding with them only adds about twice the service life vs full race conditions. My last bike, A TLR1000, showed noticable loss of compression with less than 25K miles. Thnx for your time. Rob
top-end longevity...
bliffe
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Huh? My TL000R showed almost -zero- loss of compression at 27k with only a minimal amount of increase in "leak down", and the motor lives on in a competitive racebike today (probably two seasons on it now...). Besides, on the Tiller, a simple valve re-grind brings the leak-down numbers nicely into place, so I would hardly call that expensive. ..
Now, onto the fourstroke thumpers: you'r asking a single-cylinder machine that lives on the verge of terminal piston velocity to crank a lot of horsepower... The load on the Giixers is spread over 4 cylinders, and the the bike is rarely run at redline (even Rossi would have a hard time keep it there....).... Sure, the ti-valves will wear faster than comparable steel valves, but not appreciably so... If I get 25k out of my engine without wanting to tear down the top-end, I will be quite happy....
Now, onto the fourstroke thumpers: you'r asking a single-cylinder machine that lives on the verge of terminal piston velocity to crank a lot of horsepower... The load on the Giixers is spread over 4 cylinders, and the the bike is rarely run at redline (even Rossi would have a hard time keep it there....).... Sure, the ti-valves will wear faster than comparable steel valves, but not appreciably so... If I get 25k out of my engine without wanting to tear down the top-end, I will be quite happy....
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