Motorized Bicycle Engine Kit Forum  

Sponsors



Go Back   Motorized Bicycle Engine Kit Forum > Bicycle Motor > Mounting Techniques for Bicycle Motors

Mounting Techniques for Bicycle Motors Every frame is different. Share and ask questions about mounting your motorized bicycle engine kit to your bicycle frame or bicycle rack


Replacement rear engine mount

Every frame is different. Share and ask questions about mounting your motorized bicycle engine kit to your bicycle frame or bicycle rack


Reply
 
Thread Tools Display Modes
  #1  
Old 09-17-2012, 11:00 AM
rexfan10 rexfan10 is offline
Motorized Bicycle Newbie
 
Join Date: Sep 2012
Location: Highlands, Scotland
Posts: 15
Thanks: 0
Thanked 0 Times in 0 Posts
Unhappy Replacement rear engine mount

Hi, i had a strange noise coming from my bicycle engine the other day, and as i was making sure every nut and bolt was tight i came accross the fact that Part of my rear engine mount had come off/fell out. Its a little hard for me to explain and like they say: "a picture is worth a thousands words." So here ya go :

( sorry about it not being properly focused )
Basically one of the threaded bolt things rattled its way loose and fell out the
back. If somebody could tell me where i could buy one or what size the bolt and nut are, and how im to go about putting in the new one i would be much obliged. Thanks, Ruan
Reply With Quote
  #2  
Old 09-17-2012, 01:15 PM
MotorBicycleRacing's Avatar
MotorBicycleRacing MotorBicycleRacing is offline
Motorized Bicycle Elite Member
 
Join Date: Jul 2010
Location: SoCal, Orange County.
Posts: 4,751
Thanks: 348
Thanked 218 Times in 202 Posts
Default Re: Replacement rear engine mount

Quote:
Originally Posted by rexfan10 View Post
Basically one of the threaded bolt things rattled its way loose and fell out the
back. If somebody could tell me where i could buy one or what size the bolt and nut are, and how im to go about putting in the new one i would be much obliged.
Those threaded bolt thingies are called studs and the size is 6 mm 1.0

Hopefully it didn't break off in the motor.
__________________
GEN V 40mm STROKE 69cc "BALANCED" MOTORS, KITS & PARTS 4 SALE
Next SMBR Race SAT OCTOBER 18TH 2014 at Grange Motor Circuit.
Reply With Quote
  #3  
Old 09-17-2012, 03:00 PM
rexfan10 rexfan10 is offline
Motorized Bicycle Newbie
 
Join Date: Sep 2012
Location: Highlands, Scotland
Posts: 15
Thanks: 0
Thanked 0 Times in 0 Posts
Default Re: Replacement rear engine mount

Hi, Thanks for the sizes. im afraid it has broken off in the motor do you have any tips on getting it out? Thanks, Ruan.
Reply With Quote
  #4  
Old 09-17-2012, 03:03 PM
MotorBicycleRacing's Avatar
MotorBicycleRacing MotorBicycleRacing is offline
Motorized Bicycle Elite Member
 
Join Date: Jul 2010
Location: SoCal, Orange County.
Posts: 4,751
Thanks: 348
Thanked 218 Times in 202 Posts
Default Re: Replacement rear engine mount

Quote:
Originally Posted by rexfan10 View Post
Hi, Thanks for the sizes. im afraid it has broken off in the motor do you have any tips on getting it out? Thanks, Ruan.
Do you have a pic of the broken off stud?
is there any part of the stud sticking out or is it flush or even broken inside?

Do NOT do anything in haste as you can make the problem much worse.
__________________
GEN V 40mm STROKE 69cc "BALANCED" MOTORS, KITS & PARTS 4 SALE
Next SMBR Race SAT OCTOBER 18TH 2014 at Grange Motor Circuit.
Reply With Quote
  #5  
Old 09-17-2012, 03:50 PM
rexfan10 rexfan10 is offline
Motorized Bicycle Newbie
 
Join Date: Sep 2012
Location: Highlands, Scotland
Posts: 15
Thanks: 0
Thanked 0 Times in 0 Posts
Default Re: Replacement rear engine mount

Hi, there is a tiny bit of it still sticking out, i might be able to clamp it with some pliers but am worried on clamping it so hard that it sort of squashes it leaving me with nothing to grip with. Heres a pic:



You can see just how little of its exposed as you can only see one bit of the thread. Its also in a very awkward place so to get it out id have to take the engine right off the bike
Reply With Quote
  #6  
Old 09-17-2012, 04:06 PM
MotorBicycleRacing's Avatar
MotorBicycleRacing MotorBicycleRacing is offline
Motorized Bicycle Elite Member
 
Join Date: Jul 2010
Location: SoCal, Orange County.
Posts: 4,751
Thanks: 348
Thanked 218 Times in 202 Posts
Default Re: Replacement rear engine mount

Quote:
Originally Posted by rexfan10 View Post
Hi, there is a tiny bit of it still sticking out, i might be able to clamp it with some pliers but am worried on clamping it so hard that it sort of squashes it leaving me with nothing to grip with. Heres a pic:

You can see just how little of its exposed as you can only see one bit of the thread. Its also in a very awkward place so to get it out id have to take the engine right off the bike
Did you use any loctite on the stud?

Take the motor off the bike.

There are a few ways to remove the stud depending on what tools
you have .

Do you have access to a welder?
You can weld a stud or nut to the broken piece then unscrew it.

Personally, I would file the broken end of the stud nice and flat.

Center punch the middle of the stud very accurately.

Drill a 1/8" hole making very sure it was centered and going in straight into the stud.

Once you have the hole drilled try a larger bit then reverse the drill and sometimes
the stud will come out.

If not drill the hole larger so it is the right size for an EZ out.
I find that the square EZ outs work the best.

Be very careful when you turn the EZ out as they break off fairly easily
and they are very hard steel so almost impossible to remove.

The last option is to keep drilling all of the stud .out and re-tap the hole.
__________________
GEN V 40mm STROKE 69cc "BALANCED" MOTORS, KITS & PARTS 4 SALE
Next SMBR Race SAT OCTOBER 18TH 2014 at Grange Motor Circuit.

Last edited by MotorBicycleRacing; 09-17-2012 at 04:14 PM.
Reply With Quote
  #7  
Old 09-17-2012, 04:58 PM
2door's Avatar
2door 2door is offline
Super Moderator
 
Join Date: Sep 2008
Location: Littleton, Colorado
Posts: 13,796
Thanks: 1
Thanked 763 Times in 603 Posts
Default Re: Replacement rear engine mount

If you have a Dremel tool and a cut-off wheel for it you can grind a screwdriver slot in that stud and possibly back it out with a screwdriver. If you used Loctite on the threads,
sorry but, good luck.

Tom
__________________
Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"
Reply With Quote
  #8  
Old 09-17-2012, 05:14 PM
bairdco's Avatar
bairdco bairdco is offline
a guy who makes cool bikes
 
Join Date: Aug 2009
Location: living the dream in southern california
Posts: 5,926
Thanks: 6
Thanked 129 Times in 100 Posts
Default Re: Replacement rear engine mount

you can also buy left handed drill bits that are used to remove broken studs like that. they sell them at Harbor Freight for pretty cheap, but i dunno how easy they are to get in scotland.

the tip above from tom is what i'd try first.
Reply With Quote
  #9  
Old 09-18-2012, 01:38 AM
rexfan10 rexfan10 is offline
Motorized Bicycle Newbie
 
Join Date: Sep 2012
Location: Highlands, Scotland
Posts: 15
Thanks: 0
Thanked 0 Times in 0 Posts
Default Re: Replacement rear engine mount

Hi. The engine came with the studs in so i am unsure wether the seller/manufacturar used loctite on them. Im also afraid i have no access to a welder, punch or dremel I was going to try using theese clamp/plier things we have, and if that failed go to a very mechanically knowledged friend of mine who does have a grinder, and probably every other tool mentioned above. Thanks for your help, Ruan.
Reply With Quote
  #10  
Old 09-18-2012, 04:08 AM
JonnyR JonnyR is offline
Motorized Bicycle Elite Member
 
Join Date: May 2012
Location: ronkonkoma, new york
Posts: 1,203
Thanks: 0
Thanked 4 Times in 4 Posts
Default Re: Replacement rear engine mount

the best way to take it out is with the easy out mentioned above
__________________
Are you callin' me crazy! just cuz i got a hotel in my foot doesn't make me a boogali moogali moogali

Schwinn jaguar with a 66cc flying horse
they all run fantastic till they don't

smoke tires not drugs
YES! YES! JESUS H. TAP-DANCING CHRIST... I HAVE SEEN THE LIGHT!
http://www.youtube.com/watch?v=YoPVC4YxDlI
http://www.youtube.com/watch?v=y0O7_...eature=related
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 02:05 PM.


Sponsors

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
MotorBicycling.com