yeah, i change the oil, drain the tank and replace the spark plug every year. even do the recommended re-lubing. i want to be able to blow through wet drifts like my neighbor does with his new 9 hp. i've browsed the tecumseh catalog and the 5 and 7hp engines seem to have similar shafts and base. i'll give the dealers a call. i believe there's no substitute for displacement!
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