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APEmike · April 11th, 2016, 10:13 AM

Honeybadger has it right. You'll need to start with a 300 engine, Take a 250 block and put in bigger sleeves and +4 pistons. Some serious headwork with all the secret sauce. Custom camshaft, heavy valve springs, stainless steel valves, bronze valve seats (factory seats suck, ask @mgentz). Some sort of improvement in the factory oiling system, more pressure and volume.

Fact of the matter is some of the parts that are needed just dont exist. Stainless valves dont exist in the sizes needed to make valves for the 250/300. Oiling stuff like a high volume pump or pump gear and a high pressure oil relief valve aren't really out there either.

The sad truth is we are dealing with a sophisticated lawnmower engine. Oem parts are not designed for much more than a factory setup.

April 11th, 2016, 10:13 AM	#6
APEmike ninjette.org member Name: Michael Location: Tehachapi, CA Join Date: Oct 2014 Motorcycle(s): 2014 Ninja 300 Posts: 160	Honeybadger has it right. You'll need to start with a 300 engine, Take a 250 block and put in bigger sleeves and +4 pistons. Some serious headwork with all the secret sauce. Custom camshaft, heavy valve springs, stainless steel valves, bronze valve seats (factory seats suck, ask @mgentz). Some sort of improvement in the factory oiling system, more pressure and volume. Fact of the matter is some of the parts that are needed just dont exist. Stainless valves dont exist in the sizes needed to make valves for the 250/300. Oiling stuff like a high volume pump or pump gear and a high pressure oil relief valve aren't really out there either. The sad truth is we are dealing with a sophisticated lawnmower engine. Oem parts are not designed for much more than a factory setup. __________________________________________________ I ride because therapy is too expensive, and less fun.