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Well, here's my build as it's getting started. My goal is to build something similar to an Rtrike called "Rebirth" except I want to build a one-seater. He uses a type 1 VW font end with a hayabusa motor and rear suspension. Though I plan on doing something more aggressive with my chassis, I like his overall idea.
Since I don't have the money for a sportbike powerplant, I've decided to look for the ever popular 750 motor. Suzuki, Honda, and Kawasaki all made very strong 750s through the '70s and '80s and they are very easy to come by. I found a complete, titled, and running Suzuki GS750 on Craigslist for $300 and snatched it up right away. On the coldest of days it still starts right up, but I will plan on installing a new clutch and cleaning and resynching the carbs.
I also purchased my type 1 front end from Craigslist -- I got a complete front end from spindle to spindle -- with all the steering components -- for $100. It's a little rough, but solid, and I plan on adding disc brakes to it. Here are some pics of type 1 front ends.
Finally, there's my rear suspension. I purchased the entire rear swingarm, wheel, brakes, hardware from a 2000 Ninja 900r for $100 as well. Originally I was going to build my own swingarm and use a really wide drag racing setup, but I decided that it would be outside of my budget to do something like that. And since sportbikes have relatively large rear wheels stock, it'll be easier to use the entire setup as it is -- the Ninja has a 6" wide rear wheel and I can probably fit a 7" wide tire on it. Here's a pic of the exact bike I got the swingarm from:
So now for my questions. First and foremost there's the question of gearing. Obviously I'm going to need more low end to deal with the extra weight, and I'd like to improve acceleration and reduce top-end. So, are there any stock sprockets that can be used as direct replacement to lower my gear ratio? Does anyone know of any aftermarket sprockets that are availble in various sizes for the 78 GS750?
Secondly, there's the issue of the clutch. Obviously the GS750 motor wasn't designed to move around 600-800 lbs of metal, so I'm wondering what all I can do to upgrade the clutch to make sure that I'm not wearing it out everytime I stand on the gas pedal a little bit.
This is a big project, and any advice or critiques is welcomed. Thanks guys!
I'll post pic updates for all my parts and stuff later this week.
Since I don't have the money for a sportbike powerplant, I've decided to look for the ever popular 750 motor. Suzuki, Honda, and Kawasaki all made very strong 750s through the '70s and '80s and they are very easy to come by. I found a complete, titled, and running Suzuki GS750 on Craigslist for $300 and snatched it up right away. On the coldest of days it still starts right up, but I will plan on installing a new clutch and cleaning and resynching the carbs.
I also purchased my type 1 front end from Craigslist -- I got a complete front end from spindle to spindle -- with all the steering components -- for $100. It's a little rough, but solid, and I plan on adding disc brakes to it. Here are some pics of type 1 front ends.
Finally, there's my rear suspension. I purchased the entire rear swingarm, wheel, brakes, hardware from a 2000 Ninja 900r for $100 as well. Originally I was going to build my own swingarm and use a really wide drag racing setup, but I decided that it would be outside of my budget to do something like that. And since sportbikes have relatively large rear wheels stock, it'll be easier to use the entire setup as it is -- the Ninja has a 6" wide rear wheel and I can probably fit a 7" wide tire on it. Here's a pic of the exact bike I got the swingarm from:
So now for my questions. First and foremost there's the question of gearing. Obviously I'm going to need more low end to deal with the extra weight, and I'd like to improve acceleration and reduce top-end. So, are there any stock sprockets that can be used as direct replacement to lower my gear ratio? Does anyone know of any aftermarket sprockets that are availble in various sizes for the 78 GS750?
Secondly, there's the issue of the clutch. Obviously the GS750 motor wasn't designed to move around 600-800 lbs of metal, so I'm wondering what all I can do to upgrade the clutch to make sure that I'm not wearing it out everytime I stand on the gas pedal a little bit.
This is a big project, and any advice or critiques is welcomed. Thanks guys!
I'll post pic updates for all my parts and stuff later this week.
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