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Showing results for tags 'Topend'.
Just rebuilt my topend with a driveline 392 kit and wanted opinions on how it sounds initially. Sounds a bit rich at the air screw but other than that, crispy to my ears and it seems to rev out well in neutral. Haven’t ridden it yet so load may change that. Driveline suggested a 320-340 main for my elevation and yearly temp range. They were very specific with the needle clip position so i doubt that needs to be changed. The excessive smoke when revving is just from the assembly oil. Engine mod list: Driveline 392 Assassin topend (as cast), FMF Fatty pipes w/ T5 silencers, +4 timing, VF4 reeds, Chariot billet intake, Stock carbs (320 main, 30 pilot, Stock needle at 4th clip), Uni pod filters (one stage), a Noss trixx coolhead w/ 20cc big bore domes, and Sunoco 110 race gas with klotz benol @ 32:1 videos:
My topend was getting a little worn and since it doesn’t have an ideal port for my riding style (it’s drag ported and I trail / MX) I decided to get a different set of trail/dune ported cylinders. My old topend has a pro design coolhead but I’m debating on getting a driveline head since it’s designed to use the stock length studs which is what the new cylinders have. Are there any cooling differences between the two heads? There’s nothing physically wrong with the coolhead, I figured I could sell the old topend as a complete kit that can be rehoned and reringed and just use the driveline head if it has the same/better cooling capacity.