511
Briggs Flathead / Re: Question About 18hp twin II opp.
« on: October 25, 2008, 11:18:41 pm »No, leave it alone. Here is a hint. Measure the valve and the stem. Subtract the stem measurement from the valve measurement. Now measure the exhaust port. You don't want the ports bigger than the valves can handle.Yea thats what im doing ..... just gave an example
You also don't need a pipe off a dirt bike. Just build a header out of small exhaust pipe. Don G at g-team sells some nice U bend pipe for this along with the flanges.
A steped header works best.
Paul