Would this full suspension bike hold an engine?

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FourFrequency

New Member
Nov 6, 2011
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Allston
This is my brother's old Jamis Dakar Sport mountain bike from highschool.



I'm looking to do a build and I'm wondering if this would be a good option. I wanted to put a basic 49cc Grubee motor in it.

Let me know if you think it will work or not.
 
L

leadfarmer

New Member
Sep 30, 2011
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VA
Looks too small with the shock to mount an engine, maybe a slant head...but it looks too small. Also, from what I understand you can't use a bike with rear suspension in a sprocket drive(maybe a jackshaft, but someone more knowlegeable will come along)
 
2door

2door

Moderator
Staff member
Sep 15, 2008
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Littleton, Colorado
Rear suspension is not a good idea. As the rear wheel moves it will loosen and tighten the chain. We recommend staying away from rear suspended frames unless you plan on a rack mount, either friction or chain drive where the engine moves with the wheel.
Tom
 
J

jt1111

New Member
Sep 18, 2011
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Oregon
Could you do a rear suspension if you are running a jack-shaft to a rear derailer? I was under the impression that this setup would work ok.
 
wheelbender6

wheelbender6

Well-Known Member
Sep 4, 2008
4,059
221
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TX
I would do a rear rack mounted motor on a suspension bike like yours. There doesn't appear to be enough room for a frame mounted 2 stroke motor on that bike.
 
Crazy Horse

Crazy Horse

Dealer
Feb 20, 2009
1,153
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USA
FourFrequency said:
This is my brother's old Jamis Dakar Sport mountain bike from highschool.



I'm looking to do a build and I'm wondering if this would be a good option. I wanted to put a basic 49cc Grubee motor in it.

Let me know if you think it will work or not.
Click to expand...
Look at this and tell me why you shouldn't motorize it!

Here's the link below to jschattes motorized mountain bike:

http://motorbicycling.com/f42/jschattes-bike-build-34416.html

jschattes motorized mountain bike:


jschattes motorized mountain bike:


You can do it!

C.H.
 
Rocky_Motor

Rocky_Motor

New Member
Nov 14, 2011
367
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Fort Collins & Boulder
You're gonna have some difficulties getting the sprocket on. The rear disc brake is in the way. You could get a jackshaft/shift kit, top hat adapter, or there's a few home remedies around here somewhere.
I'd also suggest getting a 66cc. No one is gonna measure your bore and stroke and the engine is smaller than some other 50cc's. But certainly up to you.
 
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