help with predator 212cc motor - Pocket Bike Forum - Mini Bikes
Reply
 
LinkBack Thread Tools
post #1 of 26 (permalink) Old 09-11-2019 Thread Starter
PBP RACER
 
Join Date: Aug 2019
Posts: 76
help with predator 212cc motor

hey all, i wanted to change out my 50cc uberscoot stock motor for predator 212cc, can i leave the 2 speed gearbox on or does it need new tranamission, i wanted to go hopefully 40mph with scooter and 212cc, i weigh 264...any info is appreciated
Attached Images
File Type: jpg 20190321_193729_1568251096067.jpg (468.8 KB, 7 views)
jdignan is offline  
Sponsored Links
Advertisement
 
post #2 of 26 (permalink) Old 09-11-2019
verified
 
Join Date: Dec 2015
Posts: 14
I've had good luck with polini and blata engines. Definitely in the 40 to 50 mph range with stock transmission. I think it would be nearly impossible to mount the predator to the transmission.
Attached Images
File Type: jpg 20181211_173449_1568256437238.jpg (470.9 KB, 9 views)
File Type: jpg 20180910_162631_1568256478020.jpg (523.5 KB, 8 views)
File Type: jpg 20180620_173302_1568256559616.jpg (290.3 KB, 8 views)
JIMMY310 is offline  
post #3 of 26 (permalink) Old 09-12-2019 Thread Starter
PBP RACER
 
Join Date: Aug 2019
Posts: 76
but would predator work then going 40mph without transmission?
jdignan is offline  
Sponsored Links
Advertisement
 
post #4 of 26 (permalink) Old 09-12-2019
Super Moderator
 
MrKitty's Avatar
 
Join Date: Mar 2014
Age: 39
Posts: 1,643
Garage
that polini puts out way more power and RPM then a predator...

you might as well do that swap...

Faster then a speeding E Revo

Last edited by MrKitty; 09-12-2019 at 02:21 PM.
MrKitty is online now  
post #5 of 26 (permalink) Old 09-12-2019
Re: help with predator 212cc motor

Do you have a death wish?? The 212cc is way to heavy for your scooter and the low end torque will flip over on you, or you to lose control. In Calif. the top speed is 30 MPH to stay legal.

Empty Pockets Racing: The difficult we do, the impossible takes longer.....
EPR is offline  
post #6 of 26 (permalink) Old 09-12-2019 Thread Starter
PBP RACER
 
Join Date: Aug 2019
Posts: 76
thanks for the info, i looked at polini engines but i think they are way over my budget, only price i saw online is 6000$ usd, thats why i was thinking the 212 predator because its 120$ and i can find upgrades easy
jdignan is offline  
post #7 of 26 (permalink) Old 09-12-2019 Thread Starter
PBP RACER
 
Join Date: Aug 2019
Posts: 76
ok 212 is too big, i was thinking that it might be, what about 79cc predator and can i hook it up to gearbox or is it too much power for that
jdignan is offline  
post #8 of 26 (permalink) Old 09-12-2019 Thread Starter
PBP RACER
 
Join Date: Aug 2019
Posts: 76
i dont live in cali anymore btw
jdignan is offline  
post #9 of 26 (permalink) Old 09-12-2019
Super Moderator
 
MrKitty's Avatar
 
Join Date: Mar 2014
Age: 39
Posts: 1,643
Garage
The problem is four strokes have torque and not rpm so you need a way to convert that torque into RPM with some kind of CVT or transmission gerd at the right ratio for the engine

You would probably be much better off modifying the engine you already have.

Faster then a speeding E Revo
MrKitty is online now  
BUILDEM,WRECKEM,REBUILDEM
 
CAM2's Avatar
 
Join Date: Mar 2008
Posts: 21,215
Re: help with predator 212cc motor

Quote:
Originally Posted by MrKitty View Post
The problem is four strokes have torque and not rpm so you need a way to convert that torque into RPM with some kind of CVT or transmission gerd at the right ratio for the engine

You would probably be much better off modifying the engine you already have.
This is the 2 speed setup he needs but for an engine as big as the 6.5 or 7hp Predator he only needs to modify the engine to run without the governor and a Torque-a-verter and he will do 50-55 mph without a 2 speed transmission.....................



One thing about putting such a heavy torque monster of an engine on a scooter frame...It wont be easy to control due to the weight of the engine is gonna be the culprit....

I tried putting a 5hp flattop on a GSMoon scooter....I turned it into a mini-minibike....LOL



If the OP would learn how to port and modify the engine he has he will be able to hit 40mph with what he has.........


When this pic was taken my homemade stand-up scooter did 42-43mph with a modded 49cc engine and a CVT transmission.....


Attached Images
File Type: jpg 11526_10201846645306305_1444995576_n.jpg (29.2 KB, 2 views)

Cut
Up
Stuff
To
Obtain
Masterpiece

Last edited by CAM2; 09-12-2019 at 09:51 PM.
CAM2 is offline  
post #11 of 26 (permalink) Old 09-12-2019 Thread Starter
PBP RACER
 
Join Date: Aug 2019
Posts: 76
yeah i got upgraded exhaust and carb but cant use bore kit because discontinued motor is what i was told
Attached Images
File Type: jpg Screenshot_20190814-080013_Samsung Internet_1568338260418.jpg (95.7 KB, 2 views)
File Type: jpg Screenshot_20190814-080103_Drive_1568338311230.jpg (149.5 KB, 2 views)
jdignan is offline  
Super Moderator
 
MrKitty's Avatar
 
Join Date: Mar 2014
Age: 39
Posts: 1,643
Garage
you can do a base gasket delet mod to up the compershon port and blueprint the cylinder and crankcase lighten the flywheel turbo crank mod lighten the wrist pin add a rocket key and a boost bottle and that thing will crank out the sweet sound of stellar RPMs for basicly free...

if you want to spend some money you can put SKF bearings in the crankcase and try to find some Japanese crankcase seals for a genuine Honda brush cutter.

bolt on performance parts are not the way to go...

Faster then a speeding E Revo

Last edited by MrKitty; 09-12-2019 at 10:30 PM.
MrKitty is online now  
post #13 of 26 (permalink) Old 09-13-2019 Thread Starter
PBP RACER
 
Join Date: Aug 2019
Posts: 76
ok, i am new to this but will do mega research, already read some about gasket delete mod and it seems like i gotta do this carefully
jdignan is offline  
Super Moderator
 
MrKitty's Avatar
 
Join Date: Mar 2014
Age: 39
Posts: 1,643
Garage
its supper easy all you do is pull the cylinder off use some brake cleaner and a plastic razor blade (not the typical metal ones) and gently remove the old gasket remnants not leting any fall into the crank case then apply a micro thin layer of yamabond or hondabond to the jug and slide the cylinder back on well compersing the rings with your fingers to help them start tighten her up and enjoy free horsepower...

if you add a rocket key and boost bottle at the same time you will notace a big difference in performance...
Attached Images
File Type: jpg 51orZfsJY7L_1568352314265._AC_SY400_.jpg (30.4 KB, 3 views)

Faster then a speeding E Revo

Last edited by MrKitty; 09-13-2019 at 01:29 AM.
MrKitty is online now  
BUILDEM,WRECKEM,REBUILDEM
 
CAM2's Avatar
 
Join Date: Mar 2008
Posts: 21,215
Re: help with predator 212cc motor

Quote:
Originally Posted by jdignan View Post
ok, i am new to this but will do mega research, already read some about gasket delete mod and it seems like i gotta do this carefully
Only of you dont totally disassemble the engine to build it up........

You dont want gasket pieces getting in the crankcase or the crank bearings......

Its a lil more than just removing a gasket but it isnt overly hard if you follow and adhere to the laymans directions to modifying these types of engines or you will need to learn how to use a degree wheel...........

Just know that these engines were never intended for rideables and the extra loads exerted on them...Theyre backpack blower, auger , trashpump and brushcutter replacement engines adapted to be put on rideables....

The engine you have is a knockoff of real Mitsubishi brand 2 stroke engine...

If you do a proper search and read through the threads youll find plenty of information.....

Good luck

Cut
Up
Stuff
To
Obtain
Masterpiece
CAM2 is offline  
post #16 of 26 (permalink) Old 09-13-2019 Thread Starter
PBP RACER
 
Join Date: Aug 2019
Posts: 76
hey thanks, i just dont know what compersing the rings with your fingers mean
jdignan is offline  
post #17 of 26 (permalink) Old 09-13-2019 Thread Starter
PBP RACER
 
Join Date: Aug 2019
Posts: 76
yamabond is high temp and will work with my stupid exhaust to manifold? i cant find any exhaust gasket that matches manifold
jdignan is offline  
Super Moderator
 
MrKitty's Avatar
 
Join Date: Mar 2014
Age: 39
Posts: 1,643
Garage
you can get gasket material at the auto parts store and cut one out yourself RTV orang is high temp silicone design for exhaust use you can also get that at the auto parts store but I don't recommend it because it tends to ooz and block some of the exhaust port but if your carfull you can just RTV it

We like to use yamabond or hondabond because it is resistant to two-stroke oil and fuel if you use RTV it will slowly erode away when used on a cylinder 2 crank case application

Faster then a speeding E Revo
MrKitty is online now  
Re: help with predator 212cc motor

Think he is talking about compressing the rings on the piston to put the cyld on. If you have 2 wood ice cream sticks modified and someone hold the cyld you can press the rings in and slide the cyld over the piston.

Empty Pockets Racing: The difficult we do, the impossible takes longer.....
EPR is offline  
BUILDEM,WRECKEM,REBUILDEM
 
CAM2's Avatar
 
Join Date: Mar 2008
Posts: 21,215
Re: help with predator 212cc motor

Quote:
Originally Posted by jdignan View Post
yamabond is high temp and will work with my stupid exhaust to manifold? i cant find any exhaust gasket that matches manifold
Yamabond will not work on an exhaust manifold gasket neither will rubber fiber gasket material in the long run as the exhaust pipe will just cut right through it when the pipe bolts are tightened.....A real good exhaust gasket is layered with aluminum or made of thick layered graphite and beaded steel.....

https://www.ebay.com/itm/Exhaust-Gas....c100010.m2109

Do you have a lawnmower repair shop nearby? Tell them you want an exhaust gasket for an Echo backpack blower model PB503T...Just be prepared to pay 3x as much as the ebay link I provided.....

If you do and go there dont say pocketbike as most mowershops hate them and may refuse to sell parts to you.....

Good Luck

Cut
Up
Stuff
To
Obtain
Masterpiece

Last edited by CAM2; 09-13-2019 at 03:03 PM.
CAM2 is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Pocket Bike Forum - Mini Bikes forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may not post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome