Motorized Bicycle Engine Kit Forum  

Sponsors



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

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

Reply
 
Thread Tools Display Modes
  #1  
Old 12-29-2016, 12:12 AM
ninjaplatypus42 ninjaplatypus42 is offline
Motorized Bicycle Senior Member
 
Join Date: Mar 2016
Location: america
Posts: 94
Default Helical Gear Stuck

I'm trying to install a centrifugal clutch but the threads on the inside of the small helical gear on the engine are stripped. How else can i get the gear off besides the puller tool? I've already tried riding with the sparkplug out to try to wiggle it off to no avail.
Reply With Quote
  #2  
Old 12-29-2016, 01:53 AM
crassius crassius is offline
Motorized Bicycle Elite Member
 
Join Date: Sep 2012
Location: USA
Posts: 2,961
Default Re: Helical Gear Stuck

take out clutch, ascertain where key slot is in gear, cut down into gear to meet slot
__________________
Sometimes I sets and thinks, sometimes I jes sets.
Reply With Quote
  #3  
Old 12-29-2016, 02:17 AM
ninjaplatypus42 ninjaplatypus42 is offline
Motorized Bicycle Senior Member
 
Join Date: Mar 2016
Location: america
Posts: 94
Default Re: Helical Gear Stuck

Taking out the clutch would require taking most of the engine apart yes? That's definitely an option but it's my last resort. I may try to cut the gear off without taking anything apart.
Reply With Quote
  #4  
Old 12-29-2016, 12:43 PM
crassius crassius is offline
Motorized Bicycle Elite Member
 
Join Date: Sep 2012
Location: USA
Posts: 2,961
Default Re: Helical Gear Stuck

there is more room to get a puller onto the drive sprocket on other side, then whole clutch and shaft can be driven right out giving way more room for tools on clutch side (note: take out bucking bar and put short bolt into hole in shaft to protect in when using a regular puller)
__________________
Sometimes I sets and thinks, sometimes I jes sets.
Reply With Quote
  #5  
Old 12-29-2016, 01:43 PM
sbest's Avatar
sbest sbest is offline
Motorized Bicycle Elite Member
 
Join Date: Nov 2015
Location: Nova Scotia
Posts: 314
Default Re: Helical Gear Stuck

Remove the bolt and washer retaining the helical gear.
Set a much longer bolt to the depth of the threads.
Heat the helical gear with a propane torch, but not the crankshaft.
With 2 flat screwdrivers putt a little load on the helical gear.
Give the long bolt a sharp snap with a steel hammer.
Helical gear should come loose.
Do NOT beat on the end of the crankshaft or beat the bolt unmercifully.

Examples from webland:




__________________
That's a mighty noisy bike you got there, it must haul a lot of ass?

Last edited by sbest; 12-30-2016 at 03:46 PM.
Reply With Quote
  #6  
Old 12-30-2016, 01:59 PM
Kioshk's Avatar
Kioshk Kioshk is offline
Motorized Bicycle Elite Member
 
Join Date: Oct 2012
Location: Connecticut
Posts: 1,103
Smile Re: Helical Gear Stuck

Quote:
Originally Posted by crassius View Post
...ascertain...
This is why I can never use the term "ascertain" again:

https://www.youtube.com/watch?v=KrJYpActs7g&t=11
Reply With Quote
  #7  
Old 01-02-2017, 04:04 PM
ninjaplatypus42 ninjaplatypus42 is offline
Motorized Bicycle Senior Member
 
Join Date: Mar 2016
Location: america
Posts: 94
Default Re: Helical Gear Stuck

I've tried all the above methods and also JB welded the tool to the gear which still didnt work. Any other ideas? I've got pretty much the whole engine apart at this point so that's not an issue. I also tried just cutting the damn thing off but all i have with a metal cutting blade is a reciprocating saw and there's just not enough room.
Reply With Quote
  #8  
Old 01-02-2017, 05:53 PM
sbest's Avatar
sbest sbest is offline
Motorized Bicycle Elite Member
 
Join Date: Nov 2015
Location: Nova Scotia
Posts: 314
Default Re: Helical Gear Stuck

Cut the recip blade to the minimum length needed and come down from the end into the key as Crassius suggests. You don't need to cut right through or into the key or even right to the back of the gear, just make a big cut into it. Do it at 180 degrees as well if want too. Now, set the gear on a steel brace like a block or anvil and whack it with a cold chisel and big hammer (BFH - Big Friggen Hammer). This will spread the gear's bore enough to slide it off.

I've done it with much larger gears.

Steve
__________________
That's a mighty noisy bike you got there, it must haul a lot of ass?
Reply With Quote
  #9  
Old 01-02-2017, 07:19 PM
ninjaplatypus42 ninjaplatypus42 is offline
Motorized Bicycle Senior Member
 
Join Date: Mar 2016
Location: america
Posts: 94
Default Re: Helical Gear Stuck

I see what you and Crassius mean now, it worked! Thanks guys.
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

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 09:51 PM.


Sponsors

Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
MotorBicycling.com