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You may get an idea by going to parts list at www.landscapepower.com/pdf/Tecumseh/H60-7500.pdf Very hard to see but maybe it will help.
80 kmph
Per Champion spark plug applications chart, the gap for 6hp Tecumseh engine is .030
The HP of a John Deere 70 lawn tractor is 7hp if it has the original engine in it.
There are many ways to make horsepower. Compression, carburetion, stroke etc. A smaller engine may make more horsepower than a bigger engine. So trying to find the cc from a HP rating is guessing at best. To give you a ball park figure I just looked on a Tecumseh 6HP Power Sport engine and it says 195cc on the manufacturers tag. Hope this helps.
I'm not sure who made it, but the one I have has a Tecumseh horizontal crankshaft but no Model number on the engine. If someone has one with the engine model and number on it I would like to know so I can order parts. rongaddy@comcast.net
You do not need a Skippers Ticket if the motor is UNDER 6hp. If it is 6hp, then you DO need a Skippers ticket. Our website has all the details about skippers tickets, plus there is a wikipedia page on it too.
It is usually a Champion plug RJ19LM. The gap is .030 inches. This plug is usually used with B&S engines from 3hp - 6hp.
if you look on the side of the engine cover it should say model number engine type and code...on a 6hp murray go kart with a Tec. 6hp it reads 196cc
140
50.6
For a 1970 OMC 6HP engine, the recommended spark plug is the Champion J6C or an equivalent plug