Go Back   DIY Go Kart Forum > Building Plans And Advice > Mini Bikes, Trikes, and Choppers

Notices

Closed Thread
 
Thread Tools Display Modes
  #1  
Old 04-08-2014, 11:56 AM
Joemt Joemt is offline
Junior Member
 
Join Date: Apr 2014
Location: Montana
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Default Predator 79CC - How to setup throttle for Minibike??

I'm new here and I have a couple grandsons that I want to provide mini bikes for.

I have the bikes but I need to put a motor on one of them. I'm looking at the predator 79cc motor. I looked at the throttle setup and assume there must be a modification I need to make in order to work on a mini bike.

Can anyone help me with that? Standard parts to buy? to remove? I'm new to this and will need parts so all recommendations are welcome and appreciated.

My grandsons are 5.5 and 8. So I was going with the smaller motor for now.

Thank you
  #2  
Old 04-08-2014, 12:43 PM
landuse's Avatar
landuse landuse is offline
Moderator
 
Join Date: Nov 2010
Location: Pietermaritzburg, South Africa
Posts: 17,235
Thanks: 2,062
Thanked 3,410 Times in 2,778 Posts
Default

Welcome. If you look at the Helpful Links Sticky in the FAQ section of the forum, you will see a number of throttle hookup examples. All the clone engines will be similar. Post a pic of your engine so we can help you a bit more. Pics of the linkages
  #3  
Old 04-08-2014, 02:03 PM
porsche930dude porsche930dude is offline
Senior Member
 
Join Date: Jan 2009
Location: Upstate, NY
Posts: 906
Thanks: 4
Thanked 115 Times in 88 Posts
Default

theres some videos on u-tube
__________________
"When in doubt make it stout"
  #4  
Old 04-08-2014, 04:50 PM
Joemt Joemt is offline
Junior Member
 
Join Date: Apr 2014
Location: Montana
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Is there a better engine out there for under 200.00? Rather than the Predator 79CC?
  #5  
Old 04-08-2014, 04:59 PM
mckutzy mckutzy is offline
Senior Member
 
Join Date: May 2008
Location: bc, canada
Posts: 7,347
Thanks: 813
Thanked 1,753 Times in 1,447 Posts
Default

Typically in karts and smaller buggies and mini bikes/mini choppers, the gx200 6.5hp 196-200cc clone is the cheapest and the most popular for mods.
At HF for about $100 on sale often.
__________________
10yr+ club..... My current ride- http://www.diygokarts.com/vb/showthread.php?t=5461
  #6  
Old 04-08-2014, 05:17 PM
Joemt Joemt is offline
Junior Member
 
Join Date: Apr 2014
Location: Montana
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Default

My grand sons are only 5.5 and 8 years old....so weight is an issue I would think. SO I thought the 3 hp range would be best (20 -25 lbs)
  #7  
Old 04-08-2014, 10:24 PM
OzFab's Avatar
OzFab OzFab is offline
Senior Member
 
Join Date: Nov 2011
Location: Warwick Qld, Australia
Posts: 15,619
Thanks: 1,135
Thanked 3,399 Times in 2,676 Posts
Default

IMO, the 79cc is perfect for their age but

Everything depends on the throttle handle setup...
__________________
2013 Build-off Winner - http://www.diygokarts.com/vb/showthread.php?t=21076
  #8  
Old 04-09-2014, 12:10 AM
landuse's Avatar
landuse landuse is offline
Moderator
 
Join Date: Nov 2010
Location: Pietermaritzburg, South Africa
Posts: 17,235
Thanks: 2,062
Thanked 3,410 Times in 2,778 Posts
Default

Quote:
Originally Posted by landuse View Post
Welcome. If you look at the Helpful Links Sticky in the FAQ section of the forum, you will see a number of throttle hookup examples. All the clone engines will be similar. Post a pic of your engine so we can help you a bit more. Pics of the linkages
Here they are

HF Predator throttle hookup
http://www.diygokarts.com/vb/showthread.php?t=18571
http://www.diygokarts.com/vb/showthread.php?t=18751
http://www.diygokarts.com/vb/showthread.php?t=19856
  #9  
Old 04-09-2014, 07:10 AM
firemanjim's Avatar
firemanjim firemanjim is offline
Just kartin' around....
 
Join Date: Jul 2013
Location: Houston Texas
Posts: 5,191
Thanks: 1,056
Thanked 1,385 Times in 1,097 Posts
Default

Weight won't be an issue if the C-O-G is low enough. The 212 and 79 cc engines are almost the same weight, shape/design, and price.....
Me personally, I would have gotten the 212 and geared the bike for slow speed. That way I can change back to a speed type ratio and mod the engine (for almost nothing) to put out closer to 9+ hp...... Without having to buy a new engine a year later, or so, cause it just ain't enough anymore.
__________________
(@@)@@(@@)@@-@@@@@@ (@@)@@-@@@@@@-@@@
  #10  
Old 04-09-2014, 10:23 AM
Joemt Joemt is offline
Junior Member
 
Join Date: Apr 2014
Location: Montana
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Default

This is all great advice. I have not purchased the motor yet.

I am including a pic of the Minibike I want to get running and completed for them right now. My questions:

1. I need to raise the handle bars...to low

2. The current motor is a 3 hp and it runs, but could use a carb tuning. I will replace it if necessary (I have a second mini bike that needs a motor for sure..so even if I have to replace this motor temporarily I will.

3. I would like to add a hand break: Band? Drum? Disk? What's the way to go?

4. My property is hilley.....is the large sprocket the way to go?

5. I need the hand controls (throttle, kill switch and hand brake)

6. THe seat needs to be stabilized also..to much side play.

Am I on the right track here and I hope the pic helps. I own cutting torch, welders, drill press and metal chop saw. I don't want to reinvent the wheel just complete a safe mini bike for my grand boys. Thank you
Attached Thumbnails
Manco Thunderbird.jpg  
  #11  
Old 04-09-2014, 10:24 AM
porsche930dude porsche930dude is offline
Senior Member
 
Join Date: Jan 2009
Location: Upstate, NY
Posts: 906
Thanks: 4
Thanked 115 Times in 88 Posts
Default

the 79cc is great for kids and teens. a geared down 212 is too much for many adults! iv got a 79cc on a bike and im 150lbs it hauls me up hills and everything just fine. Yes keep the big sprocket for hilly low speed riding
__________________
"When in doubt make it stout"
  #12  
Old 04-09-2014, 10:25 AM
88nightrider's Avatar
88nightrider 88nightrider is offline
Senior Member
 
Join Date: Mar 2014
Location: Norway, Sandnessjoen
Posts: 130
Thanks: 27
Thanked 15 Times in 13 Posts
Default

Are there no brakes on the bike as it is?
  #13  
Old 04-09-2014, 11:00 AM
Joemt Joemt is offline
Junior Member
 
Join Date: Apr 2014
Location: Montana
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Default

The brake pedal is bent I believe (awkward for sure). The boys are use to hand brakes on their petal bikes and thought it would be an easy transition for them......and better brakes.

Is the robin 4hp motor a good motor?
  #14  
Old 04-09-2014, 11:15 AM
88nightrider's Avatar
88nightrider 88nightrider is offline
Senior Member
 
Join Date: Mar 2014
Location: Norway, Sandnessjoen
Posts: 130
Thanks: 27
Thanked 15 Times in 13 Posts
Default

Quote:
Originally Posted by Joemt View Post
The brake pedal is bent I believe (awkward for sure). The boys are use to hand brakes on their petal bikes and thought it would be an easy transition for them......and better brakes

Might be posible to just put a brake lever on the handle bar, and use the existing brake.
Or get one of those "sprocket brakes". Uses the rear sprocket as an brake disk.
But pictures would help
  #15  
Old 04-09-2014, 12:05 PM
Joemt Joemt is offline
Junior Member
 
Join Date: Apr 2014
Location: Montana
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Default

I did attach a pic.........but I can take specific pics of components of the mini bike
  #16  
Old 04-09-2014, 05:33 PM
firemanjim's Avatar
firemanjim firemanjim is offline
Just kartin' around....
 
Join Date: Jul 2013
Location: Houston Texas
Posts: 5,191
Thanks: 1,056
Thanked 1,385 Times in 1,097 Posts
Default

It has a scrub brake. Very effective.... You could probably add (need pics to verify) a small band brake, hooked to a hand control, for normal slow downs and what not, and keep/fix the scrub brake as the "O $#! !!" moments when you need to STOP NOW.... Lol
Handle bars? Gonna need pics of how they are attached so we can see what kinda options you have....
Post pics of the current brake set up, the handle bars/mounts, and both sides of the back tire....
Nice looking scooter.....
__________________
(@@)@@(@@)@@-@@@@@@ (@@)@@-@@@@@@-@@@
  #17  
Old 04-10-2014, 05:28 AM
Jim-L-L's Avatar
Jim-L-L Jim-L-L is offline
Senior Member
 
Join Date: Feb 2013
Location: South Australia
Posts: 176
Thanks: 41
Thanked 22 Times in 12 Posts
Default

Hi Mate, you can check out how I set my throttle cable to carb it can be real simple ! I used the little brass insert from a insulated electrical strip connector, cable in one side and wire throttle linkage in the other, tighten the 2 screws and works perfect

Pg 3, Post 43 & 52 show it
http://www.diygokarts.com/vb/showthr...t=22995&page=3

P.s. it's only 3.5 hp and i'm 42 and 120 Kg's ! plenty fast enough with great pickup
Cheers Jim
  #18  
Old 04-10-2014, 10:41 AM
Joemt Joemt is offline
Junior Member
 
Join Date: Apr 2014
Location: Montana
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Will get pics tonight
Closed Thread

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not 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



All times are GMT -6. The time now is 09:40 AM.