1sick6 Posted January 23, 2011 Report Posted January 23, 2011 Hey everyone, I have been thinking about this for a while now and have all the parts to build a new engine, I was just keen to see if any one had build a banshee engine and used the rz350s gear box before? What sort of speed could a 421 cheetah reach with 17/40 gearing with the RZ box and 20" tyres? any thoughts on the subject would be good Thanx, Paul Quote
robert0762 Posted January 23, 2011 Report Posted January 23, 2011 a buddy of mine put an rz tranny in his bike and he had a hell of a time tryin to figure out the correct gearing. he only has a stock stroke play port though. He don really like it its to tall for that motor especially in the low rpms and trying to launch. by the time he worked it out he was pullin the same top speed as most stock boxes would.So if it were me i would just swap the sprockets out and save the headache. Plus its hard to find the rz stuff Quote
bansheesandrider Posted January 23, 2011 Report Posted January 23, 2011 (edited) A Banshee has a close ratio gearbox and a RZ has a wide ratio gearbox. This means that the RPM drop when you shift is far greater on a RZ than it is on a Banshee. This was fine on a street bike equipped with a powervalve setup, but it will suck on a non- powervalved off road machine. If you are looking for more speed you would be better off changing your sprockets. Edited January 23, 2011 by bansheesandrider Quote
BigRed350x Posted January 23, 2011 Report Posted January 23, 2011 The only difference on the RZ gears is 6th. Other than that all the lower gears have the same ratio. The 6th gear that's different isn't really that big of a difference from the banshee 6th gear. If you want top end speed why the hell are you running 20" tires? That's totally counter productive to what your goal is. Quote
1sick6 Posted January 24, 2011 Author Report Posted January 24, 2011 The only difference on the RZ gears is 6th. Other than that all the lower gears have the same ratio. The 6th gear that's different isn't really that big of a difference from the banshee 6th gear. Why would you say theres no differance when one of the biggest differances between the RZ and the Shee engine is the trans ratios. Dont bother commenting if you have no idea what your talking about. Banshee Tranny Ratios: 1st-- 2.461 2nd-- 1.812 3rd-- 1.500 4th-- 1.250 5th-- 1.045 6th-- 0.875 RZ 350 Tranny Ratios: 1st-- 2.571 2nd-- 1.778 3rd-- 1.318 4th-- 1.083 5th-- 0.962 6th-- 0.889 Quote
Larry's Shee Posted January 24, 2011 Report Posted January 24, 2011 I knew it was more than one gear. Glad you had the numbers 1sick Lots of info on the internet, unfortunately some of it is WRONG!! Quote
jbooker82 Posted January 25, 2011 Report Posted January 25, 2011 About the only situeation I would run a RZ transmission is if I was in a country that allowed you to plate and ride your banshee on the street, and I was building a street machine. I dont know how a wide ratio gear box would work in the dirt. If the banshee had more torque then I guess a wider ratio would be good. Quote
BigRed350x Posted January 25, 2011 Report Posted January 25, 2011 Not sure where you found those numbers, the old clymers manual i have for the RZ engine lists the same ratios as the banshee trans. Quote
BigRed350x Posted January 25, 2011 Report Posted January 25, 2011 I knew it was more than one gear. Glad you had the numbers 1sick Lots of info on the internet, unfortunately some of it is WRONG!! The information 1sick6 posted is just copied and pasted from another forum. The thread he took his information from is one where a guy was building a custom ratio transmission by taking gears from different yamaha transmissions and putting them on his trans. The following is what is listed in my RZ350 yamaha manual. Transmission primary ratio: 66/23, 2.869 Transmission 1st gear ratio: 32/13, 2.461 Transmission 2nd gear ratio: 29/16, 1.812 Transmission 3rd gear ratio: 27/18,1.500 Transmission 4th gear ratio: 25/20, 1.250 Transmission 5th gear ratio: 23/22, 1.045 Transmission 6th gear ratio: 22/25, 0.889 Transmission final ratio: 42/13, 3.230 Does this image look familiar 1sick6? Quote
1sick6 Posted January 25, 2011 Author Report Posted January 25, 2011 I actually got the ratios off of this forum in another RZ subject. and it wasnt about using a custom made trans. Its funny how you say there is no differance when I have a 2 gear clusters in front of me 1 being RZ and the other being Banshee and there is differances. If they were the same do you think I would even bring the subject up? Any way hear is some pics, ive built the engine. all thats left to do is put it in and try it. Quote
BigRed350x Posted January 25, 2011 Report Posted January 25, 2011 I actually got the ratios off of this forum in another RZ subject. and it wasnt about using a custom made trans. Its funny how you say there is no differance when I have a 2 gear clusters in front of me 1 being RZ and the other being Banshee and there is differances. If they were the same do you think I would even bring the subject up? Any way hear is some pics, ive built the engine. all thats left to do is put it in and try it. If yours is an RZ trans, count up the teeth on each gear for me. If what you're saying is true, then I'd like to know the tooth count so I can write it in on the manual I've got. I've had an RZ transmission in one of my old bikes and never felt any difference at all when I swapped it out for a banshee trans, with the exception of 6th gear, and it always wanted to fall on its face when it would go to 6th gear. Either way, I'd like to know the tooth count on the gears you're using... - Jared Quote
Trick2stroke Posted January 25, 2011 Report Posted January 25, 2011 Like mentioned I would imagine it would be better on a bike with a lot of tq to pull the wider ratio. Maybe a good engine to try it on would be a 10 mil super serval or a large stroke pv cheetah. Quote
gotta_goatsfast Posted January 25, 2011 Report Posted January 25, 2011 Wouldn't an RZ's 0.889:1 6th gear ultimatly be slower than the Banshee's 0.875:1 6th gear? Quote
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