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A Muffler is like a Gun Suppressor! It's the Hot Gases hitting the Cold Atmosphere that makes the Sound. The Tuned Header is to make Power, the Muffler is designed to absorb some of the Heat and Slow Down the Hot Gases allowing them Time to Cool before exiting the Exhaust. Using to Restrictive a...

From the other 277 thread, Stock Intake Duration was 180. Using this Calc. http://www.csgnetwork.com/timingportdurationcalc.html Measured Stroke = 66mm Connecting Rod Length = 120mm Port Height Above BDC = 28.3734mm for 180 Duration. What is the Exhaust Duration?

(96mm x 69mm) 499.44cc. The GX390 Case Max Bore is 100mm with a Sleeve. If you Nikasil it, you can go Bigger. The Biggest Single I have seen is (100mm x 86.5mm) 679.37cc. The Vegas Cart 625 is (96mm x 86.5mm) 626.11cc. Stock 23hp@3600rpm...

If you turn any of these Industrial Engines over 5000rpm the Cast Iron Flywheel can Explode! The Stock Rod is designed for 3600rpm, so if turning it a higher 4000+rpm, use the Billet Rod. If turning it higher than 3800rpm the Valve Springs need to be upgraded. A 460 Single (92mm x 69mm)...

Rotax 277 cranks Any body know if someone makes any Skidoo/Rotax 277 Cranks? Stock Stroke is 66mm, would also be interested in a 70mm Stroker also. Thanks Rich