Hello everyone, I am building a go kart currently and am putting a Predator 420 in it. I found a 5 speed gearbox transmission I want to use but I’m not sure how to rig the clutch system or what to even buy. I have seen gearboxes break if a clutch system is not used. Anybody have any advice? Thanks
Predator 420 Clutch Questions
- Thread starter gcraver7
- Start date
bob58o
SuckSqueezeBangBlow
Check out Robot Cantina’s YouTube project where he puts a 420cc into a car. He uses a 40 series torque converter to connect the output shaft of the engine to the input shaft of the transmission.
That guy is really smart and knows how to do all sorts of amazing things. His engineering and manufacturing capabilities are above and beyond most of your regular gokart enthusiast.
The entire Honda Insight series is fantastic. He starts with a 212cc, but I think around episode 9 he begins to put the 420cc in.
That guy is really smart and knows how to do all sorts of amazing things. His engineering and manufacturing capabilities are above and beyond most of your regular gokart enthusiast.
The entire Honda Insight series is fantastic. He starts with a 212cc, but I think around episode 9 he begins to put the 420cc in.
bob58o
SuckSqueezeBangBlow
Show us the transmission you intend to use and we will be able to give you more specific advice.
Is the input shaft splined? What size shaft?
Are you intending to shift on the fly, or only shift when stopped?
Is the input shaft splined? What size shaft?
Are you intending to shift on the fly, or only shift when stopped?
Denny
Canned Monster
That is a lawn tractor transmission. While some can be shifted on the fly, none like it. Need pictures of the input shaft to be more specific help.
Darren
Active member
That's where I got the idea for a GX200 with EFI, proper man in a shed 
Denny
Canned Monster
Borg Warner T5.
That’s a whole car tranny
bob58o
SuckSqueezeBangBlow
I quickly looked at shifting Peerless’s on the go and somebody mentioned that it might be better to put a cutch between the output of the gearbox and the axle.
I haven’t spent anytime trying to understand it, but they were saying that the issues arise from shifting when the wheels are powered.
Let me try to find it.
#1
im trying to build a small offroad buggy with a 15hp briggs engine. I was looking into using a peerless 700 transmission maybe with a custom case and bearings and fill it all with oil. one thing im wondering about is can the peerless transmission be shifted on the fly? lets say i put a manual clutch on the buggy and use this gear box, will i be able to shift it while moving using the clutch or does the buggy have to be stationary?
[IMG alt="turftech 1"]https://oldminibikes.com/forum/data/avatars/m/15/15621.jpg?1541994355[/IMG]
#2
I have gone through 9-10 peerless 700 transmissions on my mowers, I am thinking the answer is no. When you shift from gear to gear, the output shafts seem to stop, seem to need to stop. You CAN shift while moving forward, but it is not smooth, and seems to be hard on the transmission. If the clutch somehow disengaged the output from the wheels... now that would work. You can shift all day long with power going into the transmission, it was designed for that.
I haven’t spent anytime trying to understand it, but they were saying that the issues arise from shifting when the wheels are powered.
Let me try to find it.
peerless transmission
im trying to build a small offroad buggy with a 15hp briggs engine. I was looking into using a peerless 700 transmission maybe with a custom case and bearings and fill it all with oil. one thing im wondering about is can the peerless transmission be shifted on the fly? lets say i put a manual...
oldminibikes.com
Mr X
New Member
Nov 12, 2011#1
im trying to build a small offroad buggy with a 15hp briggs engine. I was looking into using a peerless 700 transmission maybe with a custom case and bearings and fill it all with oil. one thing im wondering about is can the peerless transmission be shifted on the fly? lets say i put a manual clutch on the buggy and use this gear box, will i be able to shift it while moving using the clutch or does the buggy have to be stationary?
[IMG alt="turftech 1"]https://oldminibikes.com/forum/data/avatars/m/15/15621.jpg?1541994355[/IMG]
turftech 1
Member
Nov 12, 2011#2
I have gone through 9-10 peerless 700 transmissions on my mowers, I am thinking the answer is no. When you shift from gear to gear, the output shafts seem to stop, seem to need to stop. You CAN shift while moving forward, but it is not smooth, and seems to be hard on the transmission. If the clutch somehow disengaged the output from the wheels... now that would work. You can shift all day long with power going into the transmission, it was designed for that.
Thanks for looking into that. That’s what I figured would be needed, just not sure how to do that. Would it just be better to run a fnr gearbox or r there benefits to five speeds like the peerless
bob58o
SuckSqueezeBangBlow
Honestly, the novelty of the 5 speed gearbox is kinda cool, but unneeded if using a Torque Converter which is a continuously variable automatic transmission. Who needs 5 speeds when they could have an infinite number of speeds.
The reverse option is also cool. I’ve done much pushing my old buggy backwards. Was never too much of an issue for me.
In the Robot Cantina series, he only uses 1 gear. 3rd I think, maybe 2nd, and lets the torque converter do the work. And he has a car transmission.
I believe he does one shift during his 0-50mph time trial to compare to not shifting.
What would be the best 40 series torque converter for the money that would fit the predator 420? Go power sports had a nice one but it’s like 370 and I don’t really wanna spend that much
bob58o
SuckSqueezeBangBlow
A sprocket with overrunning bearing on the output shaft?
bob58o
SuckSqueezeBangBlow
I use Chinesium knock offs.
The backplate is somewhat expensive. If you can mount the jackshaft that holds the driven unit to the frame (I use pillow blocks) you don’t need the backplate.
also cheaper stamped backplate kits are available. I’ve never used a 40 series with a backplate, tho
The backplate is somewhat expensive. If you can mount the jackshaft that holds the driven unit to the frame (I use pillow blocks) you don’t need the backplate.
also cheaper stamped backplate kits are available. I’ve never used a 40 series with a backplate, tho