Motorized Bicycle Engine Kit Forum
Register FAQ Members List Calendar Mark Forums Read


Search Titles Only

Sponsors
To be a sponsor Contact Us
Our Forums


Go Back   Motorized Bicycle Engine Kit Forum > Bicycle Motor > 2 Stroke Bicycle Engines & Kits

2 Stroke Bicycle Engines & Kits 2 stroke motorized bicycle engine kits need careful installation and setup, find out how from our professionals here!

Installing rear sprocket


Discussion at Motorized Bicycle Engine Kit Forum in the 2 Stroke Bicycle Engines & Kits forum. Hi y'all. So I'm finally on the first step of installing my kit (after getting a frame stripped ...
Reply
 
LinkBack Thread Tools Display Modes
  #1 (permalink)  
Old 10-12-2009, 11:43 AM
Motorized Bicycle Newbie
 
Join Date: Jul 2009
Location: Canada
Posts: 12
Default Installing rear sprocket

Hi y'all. So I'm finally on the first step of installing my kit (after getting a frame stripped and painted and getting all the other components ready). My question is this: Is there a rule of thumb for tightening the 9 sprocket bolts? How tight am I supposed to tighen them? I'm pretty mechanically minded and so I'm trying to go by feel but obviously the rubber rings are throwing me off a bit because I'm not tightening metal against metal where it is easier to tell the snuggness of the bolts but instead I'm compressing (sandwiching) the rubber rings. Obviously I want the sprocket noce and immovable so it wont try to move when there's a load on it but not so tight that I distort my spokes and warp the wheel. I have used thread-locker and tightened the bolts so the sprocket is true and doesn't wobble side to side and the lock washers are compressed flat. Elshewhere in my assembly instructions it says to tighten the cylinder head bolts and other engine mounting hardware to about 9 ft/lbs of torque but I don't think that applies to the sprocket.

Any input?
Reply With Quote
  #2 (permalink)  
Old 10-12-2009, 11:49 AM
Motorized Bicycle Elite Member
 
Join Date: Jun 2009
Location: ny,ny
Posts: 597
Default Re: Installing rear sprocket

I use a nut driver (screwdriver type handle) to install as tight as possible by hand. Then a few turns with a stubby ratchet handle while spinning the wheel with a felt tip marker to find high points.
Reply With Quote
  #3 (permalink)  
Old 10-12-2009, 12:31 PM
BarelyAWake's Avatar
Moderator
 
Join Date: Jul 2009
Location: Maine
Posts: 1,184
Default Re: Installing rear sprocket

Yeah, unfortunately with the dastardly rubber ring mount technique it's "best guess" lol, don't wanna over tighten to the point they're squishing out - don't want 'em too loose...

Best bet is to get the sprocket adapter and be done with it heh
SPROCKET ADAPTER
Reply With Quote
  #4 (permalink)  
Old 10-12-2009, 12:48 PM
robin's Avatar
Motorized Bicycle Elite Member
 
Join Date: Nov 2008
Location: Penticton British Columbia Canada
Posts: 293
Default Re: Installing rear sprocket

By far the best solution is Manic Mechanics or Kings sprocket sales setup. I have the Kings setup which came on my SCSW setup bike and what a difference-no constant spoke tightening.
Reply With Quote
  #5 (permalink)  
Old 10-12-2009, 01:21 PM
Venice Motor Bikes's Avatar
Custom Builder / Dealer
 
Join Date: Mar 2008
Location: Los Angeles, CA.
Posts: 1,434
Default Re: Installing rear sprocket

Make sure the sprocket spins straight before tightening the bolts all the way!!
Tighten them slowly in a 'star' pattern & keep spinning the wheel to make sure the sprocket is still straight, then tighten some more.
Make sure it is as perfect as you can make it!!! I usually tighten them to where the rubbers touch each other.
I use a plastic head hammer to adjust it while tightening.
__________________
For engine kits & bike service in Los Angeles, visit us at- www.VeniceMotorBikes.com

Last edited by Venice Motor Bikes : 10-12-2009 at 06:19 PM.
Reply With Quote
  #6 (permalink)  
Old 10-12-2009, 04:50 PM
2door's Avatar
Moderator
 
Join Date: Sep 2008
Location: Littleton, Colorado
Posts: 1,902
Default Re: Installing rear sprocket

Having a way to spin the wheel while tightening the sprocket is almost essential. You can get it close by watching the sprocket where it goes around the hub but that's only ball park at best. The wheel needs to free spin so you can watch for any irregularities.
Use Venice Boy's advice and tighten in a star pattern, side to side so you don't bolt in a wobble. If you don't have a plastic head hammer use a block of wood to protect the sprocket teeth and any old hammer you have. Go slow, take your time, check and recheck as you tighten. I've never seen a spec for torque but all of the above advice is good.
Tom
__________________
Age and Treachery Will Always Triumph
Over Youth and Skill
Reply With Quote
  #7 (permalink)  
Old 10-31-2009, 03:14 PM
Motorized Bicycle Newbie
 
Join Date: Apr 2009
Location: jacksonville,fl
Posts: 12
Default Re: Installing rear sprocket

someone said I should file the teeth on the sprocket before I install it on the wheel is that good advice?
Reply With Quote
  #8 (permalink)  
Old 10-31-2009, 03:22 PM
BarelyAWake's Avatar
Moderator
 
Join Date: Jul 2009
Location: Maine
Posts: 1,184
Default Re: Installing rear sprocket

Well - adding a slight bevel to the sides of the teeth helps them align better should the teeth hit the side of the chain, on "real" sprockets this is commonplace...

Yet it shouldn't be a problem if you don't - the sprocket shouldn't be nicking the chain like that anyway *shrug* still, it couldn't hurt.

I'm planning on doing that the next time I change my tires out lol
Reply With Quote
Reply


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

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



All times are GMT -5. The time now is 02:35 AM.


Sponsors
To be a sponsor Contact Us
Donations accepted!

Powered by vBulletin® Version 3.6.8
Copyright ©2000 - 2009, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.1.0
Motorized Bicycle Engine Kit Forum