RZBansheeMan Posted September 27, 2007 Report Share Posted September 27, 2007 So, I was digging thru some old shit I had in a closet full of engine parts and came across an old 1984 CR 60 cylinder from my old 60. I thought it was pretty interesting to see that the reed area is almost the size of the Banshee, just a lil' narrower and a lil' taller with some decent sized boyesen ports to compliment it. It my .02 that a Banshee engine could benefit from a "big reed" conversion and "boyesen ports". I am assuming that Yamaha designed their pistons with the windows in the back to create the same effect as what the boyesen ports did, however, imo the boyesen ports would work more effectively because they are stationary an the pistons obviously aren't, but it seems that the Banshee engine would need windowless pistons to make the boyesen ports work effectively, if they were added to the Banshee cylinders....... What do ya guys think ?? Quote Link to comment Share on other sites More sharing options...
4stroker Posted September 27, 2007 Report Share Posted September 27, 2007 cool pics man i guess if you were gonna go to the trouble of reconfiguring the barrels for a larger intake etc.. you might as well upgrade properly with some cubs or cheetahs! there is some interesting reading on the rzrd500 forums where guys over there convert the rotary disc induction cylinders on the rz500s to case reed induction. anyone else got any cool two stroke sites with interesting info like this? Quote Link to comment Share on other sites More sharing options...
RZBansheeMan Posted September 27, 2007 Author Report Share Posted September 27, 2007 Yeah true, but I am more into stock cylinders, or I should say Yamaha production cylinders being these are RZ's not stock banshee. Not only that, I am not a drag racer, that stuff is too costly, serious and critical for my likeings. I am after just about the broadest motor possible for just having a blast on, and NO I will not get a big 4 stroker, it will only be some sort of Banshee / Yamaha twin. :biggrin: Quote Link to comment Share on other sites More sharing options...
dajogejr Posted September 27, 2007 Report Share Posted September 27, 2007 Yeah true, but I am more into stock cylinders, or I should say Yamaha production cylinders being these are RZ's not stock banshee. Not only that, I am not a drag racer, that stuff is too costly, serious and critical for my likeings. I am after just about the broadest motor possible for just having a blast on, and NO I will not get a big 4 stroker, it will only be some sort of Banshee / Yamaha twin. :biggrin: Just get a cheetah w/ powervalves....LOL... J/K. Quote Link to comment Share on other sites More sharing options...
sredish Posted September 27, 2007 Report Share Posted September 27, 2007 i say weld up those yammi holes and start with a new port layout. post pics during the reconstruction.... Quote Link to comment Share on other sites More sharing options...
RZBansheeMan Posted September 27, 2007 Author Report Share Posted September 27, 2007 (edited) i say weld up those yammi holes and start with a new port layout. post pics during the reconstruction.... It's something I was considering, I have to wait until I can either pick up a TIG or gain access to one, and then get my hands on another stock set of Banshee cylinders. Maybe I'm silly for thinking this but, I'm willing to bet if the stock Shee cylinders and intake had a Honda layout, there could be a lot of hidden HP discovered........ :geek: Edited September 27, 2007 by RZBansheeMan Quote Link to comment Share on other sites More sharing options...
PassionRE Posted September 29, 2007 Report Share Posted September 29, 2007 It's something I was considering, I have to wait until I can either pick up a TIG or gain access to one, and then get my hands on another stock set of Banshee cylinders.Maybe I'm silly for thinking this but, I'm willing to bet if the stock Shee cylinders and intake had a Honda layout, there could be a lot of hidden HP discovered........ :geek: Unless your on a budget, just go with the VF3's. Unmodified they are good to 120hp on gas..Jim Quote Link to comment Share on other sites More sharing options...
rocketboy Posted September 29, 2007 Report Share Posted September 29, 2007 the intake isnt where your going to see the bulk of your power increases ,would a better design help and alter some power to a specific area? ..absolutely ,but the real power is going to be in other areas .a bigger intake boxed reed area isnt really needed on a banshee till you start getting into large bore stroked combinations .the velocity over volume concept works like a charm.alot of builders including myself add boysen ports but unfortunately on a banshee they have to be located on the sides of the intake wall which IMHO isnt a good direct and distanced way to feed into the lower end for the full benefit like you see on most newer designs including cubs . Quote Link to comment Share on other sites More sharing options...
NOS_350x Posted October 10, 2007 Report Share Posted October 10, 2007 My pual turnter (duncan) ported cyl has boysen ports Not big but they are there. That motor pulls alot of mid power. Quote Link to comment Share on other sites More sharing options...
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