RGL

Hello, I'am searching for one pair of banshee-exhaust flanges to weld them on my Jolly-Moto-pipes (for RZ 350). So if someone has some old pipes and would be so kind to cut the flanges and send them to Germany I would be very happy. Thanks and best regards Raphael

Hi at All, as to this topic I would tell you my experiences with a 421cc cub motor from another maybe interesting perspective. This motor works in my RZ 350 motorbike and long time I was afraid that this motor produces too much peak power. The background is that I live in Germany where we have very much traffic and a lot of curves. So its absolute necessary to ride a controllable motor that produces smooth power. So I started to run the cub with stock carbs, stock airbox and Jolly Moto pipes (they are known for their peak power on Twostrokers). The result was astonishing because I had no problems to manage the motor. I could run this bike in the city and also on the highway. The torque was amazing and always better than my RZ-YPVS-Cylinders. In summer I testet the bike at the dyno and it produced 74hp at the crank. I know many RZ's with more power (till 88hp) but they rev much more higher and loose a lot of torque at lower revs. Their bikes are really fast but how long? Sometimes their bearings break after less kilometer because of the high revs (12000 +). My bike has max.power at 8800rpm and I don't want much more. For me it's important to get the best cylinder filling at "normal" revs. Within the next days I try 35 Keihin Carbs, Twister Intakes and K&N Pods cause I want a little more power. I hope the motor won't become too peaky but I will keep you informed. If yes it's time for a Cheetah-Cylinder :biggrin:. My friends bike with Cheetah-Cylinders produces 100hp at 9200rpm.The power curve is nearly perfect. So my personal result is: It's easy to limit cubs for better controlling until around 75hp. And for me it makes sense because of durableness. I will see what happens with the bigger carbs. Also a good way to control peaky motors is to use a 3D-Ignition-System. Low revs and low throttle means a late ignition point. High revs and low throttle also. low revs and high throttle -> early ignition point...and so on. I love my toys :cool: . Cheers Raphael

@Dr.Makoki: This is winter I try to get an approval by our technical authorities. In Germany everything is ruled !!! You can't change a screw without their acceptance. @4stroker: I was wondering too because the shipping costs of other parts I bought have been around 50$. But Andy Weeks from http://www.twocycletech.com/first_page.html told me 433$ only for shipping. Even if 433$ includes the duty (22%) it is really too much. I have no idea if this price is correct. @Meat: I don't know FFP-Pipes. Do you have a link or an address? Thanks and regards Raphael

Jared, your PM box is full...tried to send a message...

Hi Jared, I'am also interested. Would you send it to Germany? Cheers raphael

Hi, they work on my rat-track-bike. Here it is :

Hi Doc, Cub421 motor with RS125 Frame...this sounds really crazy . Sadly in Germany we are not allowed to build such great bikes and ride them on the street but only on the track. Do you run your RS on the track? Do you have any temperature problems with your Jolly? I heard that the stinger is to small which could melt down the piston. I think I must keep my Jolly because shipping some pipes from USA to Germany is about 400$ :shoothead: . So I try to search some well priced TMX38 Carbs. Otherwise I choose for some 38Keihins. Thanks and regards Raphael

Hi, no its a RZ-Motor with Banshee-Cylinders. Maybe you can use also the Banshee-Case but you have to change the gear. Cheers Raphael

@alcoholbanshee: Thanks for this link. This is what I searched. The pipes they show look absolute different from the Jolly Pipes. JL-Exhausts are also fine but made for RZ 350. I think I should choose pipes which are made for the Cub-stuff. The price is nearly the same. Cheers Raphael

Hi, yes this is an good idea to look for some banshee pipes. Don't kill me for this question but what are really good pipes for the 421cub? I think you have a big market in USA but in Germany we have none!!! Kenny Roberts? Do you mean this Kenny Roberts...our Twostrokeyamaha-god? Does he building pipes for cubs in bikes? And yes, this cube works really fine into my RZ350-bike. And I also know this mentioned France-Guy from the RZ-Forum. The problem is that nobody - also him - tells anything about the measurements of their pipes...no chance! But I think it's a waste to drive this motor with standard-pipes any longer. 39mm Keihin...this is really big :cool: . I think I choose something between 35mm and 39mm. Next summer I want to disrupt the dyno-station . Cheers Raphael

Hi, many thanks for your answers. So I will buy some 33or 35mm Keihins and K&N Filters for mor power. In Germany we have 95, 98 and 100 roz fuel. My domes have 21cc and I always use 98fuel. My ignition timing is: >2000 U/min / 17

Hello at All, my name is Raphael. I'am from Germany and I already spent a lot of time reading this great forum. I hope that somebody could help me with some questions. Last winter I bought some 421cub-cylinders (68mm wiseco piston) with a plus 4mm Crank and built a nice motor for my RZ350. My further setup is Jolly-Moto-Pipes, Boyesen Reeds with stock carbs (26mm) and air-box. On the Dyno the motor produced 73hp (crank) at 8800 rpm. For me it was not really enough because other RZ with stock RZ-Cylinders produced more than 80hp at the same time (but at higher rpm). So what I want to know is the best carb size to get more power without losing too much torque at lower rpm. This is important because I ride this bike on the street. I'am thinking about 30mm or 35mm carbs. And do you prefer Mikunis or Keihins? In Germany most people know Mikuni but we have less experiences with Keihin-Carbs. And my importants question is about the exhaust. As I already told I use a Jolly-Moto Pipe. But this pipe was built for 350ccm-motors with another porting. Banshee-pipes wont fit into my RZ-frame. So I cant buy a propper one. It would be great if somebody could give me the measures of good pipes. Maximum Revs should be around 10.000 rpm with good midrange-power. My aim ist to get 85hp at the crank.Is this real? I heard the 421 cheetahs produces around 100hp with 35mm carbs. Is this difference normal (because "only" the intakes are bigger)? Thanks for reading this and sorry for my non-perfect English! Cheers Raphael