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I finally picked up a Timbersled Mountain Horse snow bike kit for my Honda just last month. I starting prepping my bike for install but decided to check my valves since it had been a couple races since last checking them. The intakes were both out of spec. Time for new valves and seats. I bought the bike new in '05 and hadn't had to do any engine work to date so it's impressive that the oem Ti valves lasted this long. Millennium Technologies in WI did the head rebuild. I opted to stick with Ti valves over SS due to weight. MT replaced the seats with a copper beryllium seat that will extend the life of the Ti intake valves. The cylinder was stripped and had a new Nikasil coating applied followed by their diamond hone. I had read about L.A. Sleeve in the past but it totally slipped my mind when it came time for the rebuild. Next time! A racing buddy insisted I only use a Wossner piston kit, it's a really nice piston. I just finished assembling the engine 2 nights ago and finished installing the MH kit and a new TT hour/tach and a Koso temp gauge last night. I ran two 5 minute heat cycles and had no surprise leaks or sounds. Two twists of the throttle and she fired on the first kick.(I did slowly kick through about 4 or 5 times to get oil circulated around before the initial start-up) I replaced all of the carb vent lines with shorter lines after rebuilding the carb. I ziptied them all together and then ziptied close-celled foam over them to keep snow/ice from obstructing them. I have a one-way filter on the end of the lower engine vent tube for the same reason. The kit comes with an Outerwear pre-filter but I did not install it, rather I blocked all of the intake box openings with more closed-cell foam. Due to it now being spring just about and the days of deep powder riding numbered, I did not make engine shields to keep the engine warm(hopefully the t-stat will keep operating temps up) or install any sort of carb heater.