RZ/RD 350 YPVS BAnshee

[2strokespirit]

I am a Rd/Rz 350 tunner, I have 2 RD350 YPVS motors with electrics (31K). Some here claim that you can just gain 5-10 Hp more with this motor. a RD350 YPVS enjin number 31K is 58HP in stock form with that crappy pipes already, i dont know if the guys that say 5-10 Hp knows that there were a few differances in the RZ/RD 350s, some RD's has a high compression head right out of the factory (Y1 and Y2 heads) and some were restricted on the cdi and some RZ350 YPVS models just made at around 40HP, and I am not talking about the 350 Lc the one with the non YPVS (almost banshee motor). Any way what I am trying to say is, if you want to get the stroger motor, look for the 31K with its electrics, it was 58HP, with just pipes and some small mods you run 70HP easily. I know that there was a motor (not sure of the enjin number) that was 2Hp or so stronger then the 31K, i think it was one in the late 80s and the 31k was from 83-84 in my country (SA).

Some off the less powerfull RD/RZs were selling in the states and europe in the mid 80s.

Ok so my point is a stock RD350 YPVS 31k, wil have almost 20hp over a stock banshee.

 

So now I just have a few questions to guys running Rd?RZ motors.

I have a 2006 Bnahsee with Pro Circuits, will the pipes fit on the RD/RZ350 motor when fitting it into a banshee frame, I know you have to make manifolds, but the Pro circuits run close pass the banshee jugs and head and the RZ motor has powervalves, will the left cylinder powervalve pulley casing be in the way of the pipe?

I have a brand new 31K motor, ready to be installed when the banshee motor is done.

What else should I watch out for when fitting the motor, any other mods except for the servomotor and wiring?

Is the powervalve motor fun and worth it?

Thanks

[broke]

Are any of the factory performance differences in the electronics? The reason I ask is I have an RZ motor in my Banshee that has had ALOT of port work and was curious if any more performance could be had with other electronics?

 

As far as the pipes, Pro circuits will NOT fit with out a huge dent in the pipes. Rockets, both PTRs and a new unnamed pipe(contact Yaxy), are the only ones that will fit with no mods at all.

 

Fun, worth it? You're a tuner, you know probably beter than any of us the answers to these questions.

[2strokespirit]

Are any of the factory performance differences in the electronics? The reason I ask is I have an RZ motor in my Banshee that has had ALOT of port work and was curious if any more performance could be had with other electronics?

 

As far as the pipes, Pro circuits will NOT fit with out a huge dent in the pipes. Rockets, both PTRs and a new unnamed pipe(contact Yaxy), are the only ones that will fit with no mods at all.

 

Fun, worth it? You're a tuner, you know probably beter than any of us the answers to these questions.

 

Ok, what I know over the years, make sure you run the 29L cdi, not sure what the cdi units are that is restricted or much less advanced. There is a website, i think its dutch, they have all the differances on the cdis and more restricted ones, Dont know if it still exist. We did a tests on a stock RD350 31K with the 29L cdi and just swoped it with the 85-86(non 31K) cdi and you would not believe the differance and it would just not rev that high, I did it myself one day because someone told me this and gave me the webadress to check it out myself, could not believe it. The 29L is the 31K and some other models cdi unit. Make sure you run the Y2 head, thats the higher compression ratio on the 350, that specific sguish on that head without the headgasket (I dont run head gaskets in race motors) is a very nice gap with good compression ratio, much better then the Y1. In SA here is a guy who built good quaility pipes, and a guy who built good quality CDIs not just a ordinary revbox wich dont work anyway. With the right exhaust and his CDI and stock porting I have seen 350 rev up to 15000 rpm!!!! Making power, not reliable without tz bearing ( or maybe any bearing at all) I know that 15000rpm is not useable in a quad but in a 2 wheel road bike its another story and some wont believe this I know, but this was useable 15000rpm!! The combination between the pipes and ignition was awesome (not without a welded crank please)

The 31k cdi does not work with the high revving pipes, cdis curve run out at about 9000rpm, even with good high rev pipes, the cdi does not adjust the timing enough for more overrev, now some will say, adjust the stator but it does not just work that simple if you swop cdis and adjusting stators and see the differances on a dyno. So my point is that the 29L cdi is still not good enough for a modified RZ/RD350 motor. But its the best OEM one. But if you dont have a 29L please if you get one, and theres no differance, dont blame me, this is my experience over years.

Why did you put the powervalve motor in?

[broke]

Mine says 52Y on it.

 

I put the motor in to take advantage of the PV. Then I got the bug for some port work. I then wanted more so the 12port was next. While I was having the 12 port built, the 4mm crank was factored in. I then played around with quite a few carbs and pipes until I settled on the 32mm Lectrons and Rockets.

 

I'm not too concerned with the heads beacuse this one was completely recut for the stroker and race fuel.

 

I was just curious if more could be had with different electronics

[frickengreen]

I have an 84 RZ 350 engine in my banshee with T6's. they did not fit, the flanges had to be changed. the banshee uses a spring type where the rz uses a bolt on flange. I had to cut my brand new pipes and weld on the old rz pipe flanges. I also had to cut the one pipe inhalf on a seam and rotate it about 10 degrees so it would clear the powervalve cover then reweld it. the power valve actuator was installed under the fuel tank and it works good.

 

I don't know what electonics I have I will have to look someday here. I also have porting done to what extreme i'm not sure. but I know when i got my fresh motor back I only had 95 psi on each side. so i figure the port job was quite excessive. I have 35mm pwks vforce 3's and the t6's but my machine is not as fast as it should be with that combo. I need to get a new head with smaller domes so my comp. will be about 140psi. then my machine should rip.

[broke]

You can just go to a muffler shop and build your own flanges from around $10 in parts, or cut a $600 set(your choice).

 

You will never really see what an RZ can do with T6s on there. Toomey built those to run good with stock port timing. RZ exhaust timing is closer to a dune/ pseudo drag set-up. Find a pipe that will let it rev higher and work with the increased port timing.

[frickengreen]

how would I make flanges to fit onto my rz and not change the distance from the piston to the cone in my pipes. when I cut and modded them to fit I kept the same dist from the piston. wouldn't adding a flange inbetween my cyl and pipe detune them?

 

I have read this forum and have learnt a great deal about pipes and looking back the t6's weren't the best choice for my setup. :: but when i got them i knew no beter.

 

-What would be a good high reving pipe? CPI or trinity? or another. I mostly ride dunes and high speed ditches and fields.

 

-does anyone know if a banshee head (OEM or aftermaret) will fit the rz. I have used banshee head gaskets on my rz so shouldn't the head fit on. or how much will I need to shave to gain 45 psi. and will that much shaving change my squish drastically?

 

-where is the "31K " located is it a # in the serial number or is it stamped somewhere else?

Edited January 8, 2007 by frickengreen

[Yaxy]

Unlike the shee motor the RZ motor does not have a out tube that the pipes sloides over. By making an exhaust flange you are just repilicating what is alreadly on the shee.

 

I have a shee and a RZ shee and with the same pipes the distance is almost identical.

 

A RZ gasket and the shee head gasket are not the same. The RZ gasket and the head are wider in the front and are not interchangeable.

 

 

I am not sure if 45 PSI is possible while cutting the stock head. You may have to go buy a Pro-design head and get the correct domes.

 

Chris

[nunyabinness]

i have a ypvs head in my garage. i thought it was some kind of aftermarket head. so is it useable on a banshee motor? or is it only useable on a rz?

[BenBB]

wiring

I'm sure ya know, a battery or eliminator (I've run both). Very fun project I've enjoyed mine...

[strokersquid]

US RZs come in 1984 29L and 1985 52y-50 CDIs. the 52y-50 is far more reliable and sudden failures of the 29Ls are common. if you have the 29L you can get a 1985 wiring harness and stator and retro fit. we never got the full power ones in the US but the restriction was in the pipes and not the cdi.i think the cylinders hes talking about are 1UA cylinders off the so called F2 model we never got in the US and the difference here is in the port timing. IF you can find these theyll come out of Canada but theyre expen$ive and only worth a couple of HP. you can port your own similarly. Dont know nothin bout no special race heads miss Scarlet. banshee heads do not fit RZs and vice versa due to the powervalves

Edited January 9, 2007 by strokersquid