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I've always used " regular " unleaded gasoline , 87 octane , in my 5 horsepower Tecumseh engine on my snowblower and my 4 horsepower Tecumseh engine on my lawn mower
30 wt oil
SAE 10w30 Synthetic oil.
SAE 30 for operating at or above 32 degrees.
A tecumseh 6.5hp engine is a 195cc.
.030
Briggs straitton
One can find parts for a Tecumseh engine from Outdoor Distributor, Jacks Small Engine or Super X Power. One can also purchase it from online sites like eBay or Amazon.
.030 inch ( on my 24 year old 5.0 horsepower Tecumseh engine )
rl 19 lm
about 33 mph
An Autolite 258 is the recommended spark plug for a 6. 5 horsepower Tecumseh engine. A Champion RJ19LM also is recommended by the manufacturer.