toddville393 Posted April 6, 2014 Report Share Posted April 6, 2014 So I've looked around and there's so much out there it's hard for me to figure out what's best for me so I'm just going to ask. I'm building a Banshee for mostly straight lining and I want a motor that's a beast but will last longer than a month. Stock frame, probably gonna put a +12" swingarm on it and maybe some decent shocks but not gonna go to crazy with the suspension. As far as the motor goes I want to build it as big as I can without having to do any machining except porting the cylinders, which I can buy ported so that's not to big a deal. From what I've read 68mm bore x 58mm stroke (421cc) is the largest you can go without trenching and boring the case, is this true? Also I don't want to use stock cylinders bored I would preferably have a monoblock cylinder, is this a good choice, and if so what's a good monoblock that won't break the bank? Now if you have a +4mil stroker crank I know you have to have domes that are milled higher cause the piston will come farther up out of the cylinder but if you use "stroker" pistons with the raised wrist pin do you still have to use different domes? I want to run it on 91oct pump gas just cause of it's easy availability. What size carbs will be needed 34,35,38mm or 28mm slides? I'm going to run CPI Shearer pipes but will I need the small bore or big bore versions of the pipes? I know it's a lot of questions but it's also a lot of money so I want to make sure I do it right. Also I'll be assembling the motor myself and this is my first time tearing one of these apart, seems pretty simple though. Thanks ahead of time. Quote Link to comment Share on other sites More sharing options...
possum Posted April 6, 2014 Report Share Posted April 6, 2014 4cub Quote Link to comment Share on other sites More sharing options...
2004LEBanshee Posted April 6, 2014 Report Share Posted April 6, 2014 Running on pump gas your builder may suggest a serval. Not sure how cubs are on pump. Sure someone can give you some info. Quote Link to comment Share on other sites More sharing options...
special06shee Posted April 6, 2014 Report Share Posted April 6, 2014 421cub will be faster in a drag race for sure. But being your staying on pump gas, id look into a serval. pump gas 421cubs IMO really arent that fun to ride unless you on the pipe at all times. Quote Link to comment Share on other sites More sharing options...
locogato11283 Posted April 6, 2014 Report Share Posted April 6, 2014 I would go 4mm Serval if you only want to run pump gas. 4mm Serval ported 68mm bore 35mm PWK CPI small bore in-frames Pump gas V-Force 4 reeds That will get you 85HP reliably. Quote Link to comment Share on other sites More sharing options...
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