Hi all new to the forum - Page 2 - Pocket Bike Forum - Mini Bikes
Reply
 
LinkBack Thread Tools
BUILDEM,WRECKEM,REBUILDEM
 
CAM2's Avatar
 
Join Date: Mar 2008
Posts: 21,582
Re: Hi all new to the forum

Quote:
Originally Posted by Steve2020 View Post
Heres the bike and quad I have
Looks like a Chinese made mini King Quad 49cc 2 stroker with electric start and headlight...

Like this model....


11 and 72 would be 6.6:1 ratio plus you need to add in the transmission reduction too..You need 12-13:1 ratio for a 1.9hp miniquad for a rider over 80lbs..Just don't expect more than 11mph fully topped out also...

Judging by the sprocket on the transmission you need a Tf-8mm chain

If you can't get the ratio any higher due to size limitations you need to use a clutch Bell with a 6tth Tf-8mm pinion then realign the rear sprocket or mod the engine closer to 4hp....

Good Luck

Cut
Up
Stuff
To
Obtain
Masterpiece




Last edited by CAM2; 12-24-2019 at 04:16 PM.
CAM2 is offline  
Sponsored Links
Advertisement
 
Re: Hi all new to the forum

With the 3 to 1 trans and if you had 11/72 sprockets you would have about 9.6 to 1, still a little high for you, with a 78 you would have 10.09 to 1. If you could find an 80 plus tooth rear you might get 10.5

Empty Pockets Racing: The difficult we do, the impossible takes longer.....

Last edited by EPR; 12-25-2019 at 03:42 PM.
EPR is offline  
post #23 of 30 (permalink) Old 12-28-2019 Thread Starter
verified
 
Join Date: Dec 2019
Posts: 15
Thanks all

Hope you had a good Christmas

Been looking around and seems like i need 8mm setup. How do I double check this? If I measure chain link pin to chain link pin will that give me the size?

Largest 8mm rear sprocket seems to be 74 and smallest front for the quads transmission 11

Thanks
Steve2020 is offline  
Sponsored Links
Advertisement
 
PBP RACER
 
Join Date: Feb 2019
Age: 67
Posts: 78
Re: Hi all new to the forum

Yep. 8mm pin to pin. Same as 5/16. Should be 3/16 between the inner plates as well.
pntrbl is offline  
Re: Hi all new to the forum

8mm is much bigger chain than #25 Cag chain, 25 has about 750lbs strength and 8mm 1200lbs, used a lot with scooters and piston port engines and trans.
Attached Images
File Type: jpg 49cc HP Scooter2.jpg (237.0 KB, 2 views)

Empty Pockets Racing: The difficult we do, the impossible takes longer.....
EPR is offline  
post #26 of 30 (permalink) Old 12-29-2019 Thread Starter
verified
 
Join Date: Dec 2019
Posts: 15
Aahhh yes just squeezed into the shed and held the chain next to the mini bike.. The quads chain is definitely bigger... Pics attached

So guessing 6mm on bike and 8mm on quad

Thanks
Attached Images
File Type: jpg IMG_20191229_112009_1577618493844.jpg (497.0 KB, 5 views)
File Type: jpg IMG_20191229_105057_1577618506073.jpg (299.9 KB, 4 views)
Steve2020 is offline  
BUILDEM,WRECKEM,REBUILDEM
 
CAM2's Avatar
 
Join Date: Mar 2008
Posts: 21,582
Re: Hi all new to the forum

Quote:
Originally Posted by Steve2020 View Post
Aahhh yes just squeezed into the shed and held the chain next to the mini bike.. The quads chain is definitely bigger... Pics attached

So guessing 6mm on bike and 8mm on quad

Thanks
Yes theres a #25 on the minibike and a TF-8mm on the miniquad.

Just know if you buy another TF-8mm pinion and rear sprocket you can make the pocketbike TF-8mm or the pocketdirtquad to #25 to keep both chainsets the same too.

Theres 3 different types of drive chains they use on pocketbikes , pocket dirtbikes and pocket quads.…Technically theres actually 4..

#25 is like linguini, There s nothing smaller for these pocketbikes

25h is slightly beefier as H stands for Heavy Duty..The first pic shows a 25h.



TF-8MM which looks exactly like the oval shapes of the chainlinks on a timing chain.



#410 which looks exactly like a bicycle chain just slightly wider...…



#410 chain is also used for chaindrive garage door openers..



Theres a parafin wax and oil treatment you can do with some heat inside a metal can that's done to new chains to properly pre-lube to protect the chain from initial damage to the link rollers when initially used.

Im sure theres like 1000 vids on utube on the process that can be researched...Its actually very easy..

Another point to touch upon is whether to use or not to use a masterlink….

I say buy a chainbreaker tool that can do both types of chain and mend both chains without a masterlink…...Theres nothing like losing the link and having to carry or push something so small home.....

Good Luck

Cut
Up
Stuff
To
Obtain
Masterpiece




Last edited by CAM2; 12-29-2019 at 09:37 AM.
CAM2 is offline  
post #28 of 30 (permalink) Old 01-07-2020 Thread Starter
verified
 
Join Date: Dec 2019
Posts: 15
Got my new front and rear sprocket just need the chain now and to modify the rear mud guard mount and chain guard mount as the new sprocket touches them.. ... Old sprocket is on top
Attached Images
File Type: jpg IMG_20200104_102913_1578400447454.jpg (335.3 KB, 8 views)
Steve2020 is offline  
BUILDEM,WRECKEM,REBUILDEM
 
CAM2's Avatar
 
Join Date: Mar 2008
Posts: 21,582
Re: Hi all new to the forum

Quote:
Originally Posted by Steve2020 View Post
Got my new front and rear sprocket just need the chain now and to modify the rear mud guard mount and chain guard mount as the new sprocket touches them.. ... Old sprocket is on top
It will be pretty torquey now......

Cut
Up
Stuff
To
Obtain
Masterpiece



CAM2 is offline  
Re: Hi all new to the forum

Way to go Steve. You will see a big difference in your low end.

Empty Pockets Racing: The difficult we do, the impossible takes longer.....
EPR 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 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