stroker crazy Posted December 2, 2012 Posted December 2, 2012 I have a couple of projects running simultaneously but the RaZoR is the main show. Other projects are mainly to relieve the frustration when this build is stalled. Back in the day I was seduced from the four-stroke mainstream by LC and then RZ Yamahas. I followed on with later iterations of Yamaha's two-stroke, twin cylinder offerings but the '83 RZeds are my alltime favourite bike. Exciting to ride, simple to work on - what more does anyone need? It turns out that what you want can become more important than needs. To that end I have started to build my ultimate homage to the RZ. Same looks, but tidied up some, and more horsepower. The starting point: This discarded: A few additions made to give this: The plan is to add a motor to this, based on new Banshee cases, stroked and bored as far as the cases will allow. Whether my ambitions for this bike are beyond my capacities only time will tell! Crazy
Sacha Posted December 2, 2012 Posted December 2, 2012 Wow! Looks like you've got some work ahead... but it's so rewarding isn't it?
Moderator drewpy Posted December 2, 2012 Moderator Posted December 2, 2012 you'll be fine. you have a clear plan and that's a good start. start collecting the bits and before you know it it's done.
stroker crazy Posted December 2, 2012 Author Posted December 2, 2012 I've been collecting parts for a while; the only major parts outstanding are the chambers and a radiator. With a bit of luck the chambers will arrive before the new year and I'll be able to start on the body work.. Crazy
stroker crazy Posted December 4, 2012 Author Posted December 4, 2012 Tower welded to frame for Scott's steering damper: Top fork yoke counterbored for mounting bracket: Crazy
Moderator drewpy Posted December 4, 2012 Moderator Posted December 4, 2012 cool, not seen those before
stroker crazy Posted December 5, 2012 Author Posted December 5, 2012 The damper works really well because it has three different adjustment to tailor its response to your requirements. Crazy
AndyDtr08 Posted December 8, 2012 Posted December 8, 2012 THIS!!! looks interesting. Can't wait to read and see more!
stroker crazy Posted December 8, 2012 Author Posted December 8, 2012 AndyDtr08 - undergoing a bit of a hiatus with the RaZoR at the moment as the engineer building the chambers has possession of the interesting bits! The photo below gives an indication of where I'm heading. It shows the frame (before additions) with crankcase, barrels, etc., fitted to check clearances. The cases are from Banshee machined to accept Calvin Pollet barrels with a 73mm bore. The carbies are Keihin FCRs. The crank being fitted has been stroked 4mm. Crazy
AndyDtr08 Posted December 9, 2012 Posted December 9, 2012 Bike porn! Never heard of those barrels before.
dt502001 Posted December 9, 2012 Posted December 9, 2012 73mm bore with 4 mm stroke what will the final cc be then? whats the advantage with banshee cases?How does the power valve work on thoes barrels? This is a cool build and can't wait to see more I miss my rz.
stroker crazy Posted December 10, 2012 Author Posted December 10, 2012 AndtDtr08 - CP Industries manufacture monoblocks in a range of bore/stroke combinations for the ATV crowd in the USofA: http://www.cpindinc.com/ dt502001 - The extra 4mm stroke (to 58mm) with the 73mm bore gives 485cc. I don't think Banshee cases have any particular advantage; I just didn't want to risk building this rather extreme motor on second-hand cases. The power valve is still being developed, but it is a throttle controlled blade type. There are still some detail design issues to resolve, but the direction ahead is (mostly!) known. Thanks for your interest, Crazy
Moderator YamaHead Posted December 13, 2012 Moderator Posted December 13, 2012 Nice Work Crazy!..... love the steering damper & those Carbs!
dt502001 Posted December 13, 2012 Posted December 13, 2012 After looking at cp's site realy makes me think about finding another rz and trying a 600 cc,the rz 500 only made @ 85 hp and it was a weapon in it's day. aa 600cc sholud be able to top that. Any rough Hp figuers for your build?What rods are you using? and what if anything have you done with the crank to beef it up.? My rz was .040 over toomy pipes and intake and it would top 135 mph I can only imagine what a 485cc would be like. I see that billet are cases now available for building up on,but i didn't find any cranks yet any leeds on one?
stroker crazy Posted December 14, 2012 Author Posted December 14, 2012 dt502001 - There are many options from CPI (and others) for building large capacity twins on Banshee cases but there is a snag when using for a bike rather than for an ATV. They mostly have no power-valve system. This results in a sluggish mid-range with a sudden, vicious rush of power at the top. Some can be set up with a vacuum operated, guillotine-type power valve but this makes matters worse as they have a time-lag between throttle movement and valve operation. This can be tolerated with an ATV or a drag bike but would make a bike super difficult to ride. I'm not much interested in Hp numbers as such, as I am aiming for as wide a power delivery as possible and not a narrow peak kind of motor. That said, I would be surprised and somewhat disappointed if something in the vicinity of 90 Hp wasn't achieved. New cranks are available from several sources but it is most critical that they are set up perfectly and are modified to achieve the best balance possible. I will post more on crank issues if you want but it will take some time before I can ferret through my files. Crazy
stroker crazy Posted December 18, 2012 Author Posted December 18, 2012 Chambers won't be ready before the new year but they are looking beautiful so far. I will be able to retain the centre stand and have enough clearance to fit 18 inch wheels: Well worth waiting for! Crazy
Moderator Cynic Posted December 18, 2012 Moderator Posted December 18, 2012 One of the TDR forum lads has a banshee motor in his. Could be a place to tag for motor info. Cant rmember what his forum name is. Search banshee and it should pop up. I know at squires he was running lower than peak power as the bhp may only be 80 odd but the torque is off the charts and kills cranks. Dont think he is using pv either. For rideability he has a wide tune. Oh ffsake my memory is shit. Blackhat you have the memory for names.
stroker crazy Posted December 18, 2012 Author Posted December 18, 2012 Wide tune and PV for me! My tolerance for bad frights has diminished with age. Crazy
wild foamy Posted December 18, 2012 Posted December 18, 2012 @stroker crazy; may i remind you that this is a family-friendly forum and there may be minors viewing, displaying pornography is strictly forbidden! im watching this thread with interest, looks like its going to be a weapon when its finished , there doesnt look like theres much clearance between those pipes and the front wheel though, is that just a mock-up fit or will that be the case with the final assembly?
Moderator Cynic Posted December 18, 2012 Moderator Posted December 18, 2012 By rideability i think its the choice between wheelspin or wheelies. Now it just wheelies a lot. Anybody riding a banshee has to be slightly damaged.....
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