Suicide shifter on 79cc predator

RocketJ

Member
Joined
Dec 2, 2017
Messages
109
Hi all, long time lurker and builder here. I plan on upgrading my boardie from a chinakit to a 79cc or 212cc predator. I love the old suicide shifters and was hoping to implement one into my build. Is there any replacement for the centrifugal clutch so i can just run a pulley wheel and shifter?
 


RocketJ

Member
Joined
Dec 2, 2017
Messages
109

curtisfox

Active Member
Joined
May 13, 2010
Messages
620
Welcome! would post some pictures of builds, but most were under photo bucket and are gone. Look at what i have first





Center photo is of a guy in Germany, use a metal plate for a belt guide. A lot of old motor cycles had setups like this, last one is a Shaw..................Curt
 

RocketJ

Member
Joined
Dec 2, 2017
Messages
109
Welcome! would post some pictures of builds, but most were under photo bucket and are gone. Look at what i have first





Center photo is of a guy in Germany, use a metal plate for a belt guide. A lot of old motor cycles had setups like this, last one is a Shaw..................Curt
Thanks, curt. That second and third picture look pretty close to what I'm aiming for. Once i get the motor running, I'll start blocking in the shifter on my plans. I'll update accordingly.
 

curtisfox

Active Member
Joined
May 13, 2010
Messages
620
If you are going to belt drive the rear wheel, think on a 20, or 24" rime, and make it wide enough to use super-teen belt. They come in 5 grove and 6 grove, same as 5 or 6 belts, not so much the rim but the front pulley. It will eliminate a lot of slippage on the drive pulley, and look like old school belts. I went to a electrical/ maniacal repair shop and got a free takeoff pulley. I used a 24" rim.............Curt
 

RocketJ

Member
Joined
Dec 2, 2017
Messages
109
If you are going to belt drive the rear wheel, think on a 20, or 24" rime, and make it wide enough to use super-teen belt. They come in 5 grove and 6 grove, same as 5 or 6 belts, not so much the rim but the front pulley. It will eliminate a lot of slippage on the drive pulley, and look like old school belts. I went to a electrical/ maniacal repair shop and got a free takeoff pulley. I used a 24" rim.............Curt
My rear wheel is 26". I plan on running a chain from the rear wheel to a pulley and a belt from the pulley to the motor.
 

Herman Klutz

Active Member
Joined
Dec 25, 2016
Messages
217
The first time I saw this type of "clutch" was late 1959, my uncle built the grandkids a motorized bicycle using a Briggs off of a reel type lawnmower. It had a large pulley mounted on the wheel, that pulley I believe came off of an evaporative cooler, a smaller pulley on the Briggs, and what resembled an idler arm for the clutch or engagement pulley. Soon after he built it, the USAF sent us overseas, when we come home 3 years later the "remains" were in the scrap iron pile. But with 15 grandkids, the toys at grandpa's and grandma's ranch took a hell of a beating. We were all driving tractors, pickups and cars by the time we hit junior high.
 

curtisfox

Active Member
Joined
May 13, 2010
Messages
620
Just about 60 years ago i did one, 1 1/2 hp Briggs old V-plex clutch ( like a front of cvt, pinched the belt to go ). Bottom bracket bearings in a pipe for jack shaft. Welded a big sprocket to the left side of rear wheel, small sprocket on jack shaft. Road it to death, then traded it and $75 for model A. Before that had a Monark twin for a couple years till rod went out, no parts available, tried but they sent the wrong stuff. End of bikes till couple years ago ...........Curt

Here is a build to read. https://motorbicycling.com/threads/excalibur-09.37011/
 
Top