Motor aggressively yanked off of bike?

GearNut said:
Please do not put any sort of rubber in between the mounts and the frame.
It really does nothing to help out with cancelling vibration and actually increases it due to the engine being able to shake around on the rubber. This shaking also stresses the mounting studs and mount pads on the engine and more often than not leads to cracking/ shearing of the mounts.
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also if your frame is thinner or aluminum it could crack your tubes
 
JonnyR said:
that is also a problem rubbers will make this happen again eventualy
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Nonsense, I run innterube rubber under my mounts and have no such problem, pushing 2000 miles. There are differing opinions about rubber being used in the mounts, but I never seen a motor that doesn't use some sort of rubber mount on a vehicle. The rubber is not the cause of your problem...

I would like to hear/see more about your one bolt mount? Pics didnt seem to show that, unless I missed it.
 
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JonnyR said:
its not the current problem but it could break things in the future
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I disagree, but we can agree to disagree on that. At least we agree it is not the problem at hand here...

I still say he has a rear sprocket problem, maybe he didn't put a rubber piece from the rag joint on the outside of the spokes behind the sprocket? I asked what direction the sprocket was dished long ago, seems kinda funny that his doesn't dish, but I guess his kit could have come with a flat sprocket. The dish comes in handy for chain alignment... At any rate, for whatever reason, it seems his chain is dog legging inward from the motor to the rear sprocket, that's all I can figure...
 
JonnyR said:
what kind f a front mount are you running a u bolt or the 2 studs with the plate?
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When it broke I was using 2 studs and the plate, bought I bought the new U Bolt mount yesterday.

GearNut said:
Please do not put any sort of rubber in between the mounts and the frame.
It really does nothing to help out with cancelling vibration and actually increases it due to the engine being able to shake around on the rubber. This shaking also stresses the mounting studs and mount pads on the engine and more often than not leads to cracking/ shearing of the mounts.
Click to expand...

Ok, thanks for the advice, I didn't know that.

And guys, before I ride this I will take a video and show you guys my setup.
 
good idea ton show what you can so we can help keep this from happening again the u bolt mount will help alot with mounting it strait i found it easier to work with when i was installing my motor the second and third time i(i had mounting issues also) :)
 
JonnyR said:
good idea ton show what you can so we can help keep this from happening again the u bolt mount will help alot with mounting it strait i found it easier to work with when i was installing my motor the second and third time i(i had mounting issues also) :)
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Do you guys want a picture of my rear tire?
 
stuckonreplay said:
When it broke I was using 2 studs and the plate, bought I bought the new U Bolt mount yesterday.



Ok, thanks for the advice, I didn't know that.

And guys, before I ride this I will take a video and show you guys my setup.
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I am still wondering what REAR mount you were using when it broke? You said,
"I had gone with a standard front mount but a new rear mount design that only involves one stud but I thought was still very secure"
The ONE STUD thing has me lost.... I would say you shouldn't do that again, and am left wondering what new rear mount design you were using that only has one stud?
Definitely post pictures when you are building next time around
 
nightcruiser said:
I am still wondering what REAR mount you were using when it broke? You said,
"I had gone with a standard front mount but a new rear mount design that only involves one stud but I thought was still very secure"
The ONE STUD thing has me lost.... I would say you shouldn't do that again, and am left wondering what new rear mount design you were using that only has one stud?
Definitely post pictures when you are building next time around
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Yea I understand but when I assmebled it I thought it was great
 
nightcruiser said:
A picture of the rear tire showing your rag joint and sprocket may be helpful, in addition to a picture of the single stud rear mount, and the new mounting setup you plan to use on the next build....
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Yes, when all my parts arrive in the mail, but I will add a picture of the tire soon.

JonnyR said:
he tried to eliminate the engine chain side stud
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Yes

nightcruiser said:
Apparently it wasn't so great! LOL
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Unfortunetley...
 
nice add what you can when you can so we can get you back out riding and hopefully enjoying your bike(took a lot of changes to make mine the way i like it)
 
JonnyR said:
he tried to eliminate the engine chain side stud
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So the situation seems to be, there was a major chain alignment issue but instead of addressing it by adjusting the rear sprocket (rag joint) to fix the alignment he eliminated one rear motor mount stud where the chain was rubbing (or slapping). With only two pairs of studs holding the motor on the bike, the motor wasn't held securely enough by only 3 studs to hold it on the bike, specially with a major chain alignment issue....
Hopefully by now you realize this situation was completely predictable if you just acknowledge the above situation. When you build this time you need to center the motor on the bike, mount it with all 4 studs, and take a look at your chain alignment and adjust the rear sprocket mounting so the chain doesn't dog leg inward from the motor to the rear tire. If you put the new motor on the bike and don't adjust the rear sprocket you will have more trouble. (If I am reading the situation correctly)
 
nightcruiser said:
So the situation seems to be, there was a major chain alignment issue but instead of addressing it by adjusting the rear sprocket (rag joint) to fix the alignment he eliminated one rear motor mount stud where the chain was rubbing (or slapping). With only two pairs of studs holding the motor on the bike, the motor wasn't held securely enough by only 3 studs to hold it on the bike, specially with a major chain alignment issue....
Hopefully by now you realize this situation was completely predictable if you just acknowledge the above situation. When you build this time you need to center the motor on the bike, mount it with all 4 studs, and take a look at your chain alignment and adjust the rear sprocket mounting so the chain doesn't dog leg inward from the motor to the rear tire. If you put the new motor on the bike and don't adjust the rear sprocket you will have more trouble. (If I am reading the situation correctly)
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I didn't ignore the fact that there might have been a mis-alignment issue, I never knew that was even a problem, read my title, I'm a Newbie.

Anyway, it's picture time, so I can explain things:

First up, my rear tire:

2012-09-18160136.jpg


Picture of it from an angle:

2012-09-18160152.jpg


My front mount:

2012-09-18160314.jpg


My "new" rear mount:

2012-09-18160638.jpg


My theory suggested it would clear the chain, which it did:

2012-09-18160657.jpg


Hopefully this clears some things up
 
i think your problem is the front hole you drilled in the frame isnt 100% strait and that rear mount is why it ripped off that wouldnt work its not strong enough and would want to twist on the single stud because the engine isnt fully on the frame and clamped also im worryed about the plates in the back wheel not being flat together meaning that it isnt tight enough
 
also removing your peddle chain gard will help you mount the engine lower in the frame mine has a lot less vibration since i did this

also this will help with alignment
 
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