Motorized Bicycle Rockhopper, first build

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Tahq

New Member
Sep 2, 2011
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Corona, CA
My first build on my tried and true early 90's Rockhopper with a four stroke HS. Biggest challenge was converting the sprocket to fit the 32 spoke wheel, after that the remaining build was pretty standard...fabricate, fit, fidget, and force it.
 

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MotorBicycleRacing

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Jul 28, 2010
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Re: MB Rockhopper, first build

My first build on my tried and true early 90's Rockhopper with a four stroke HS. Biggest challenge was converting the sprocket to fit the 32 spoke wheel, after that the remaining build was pretty standard...fabricate, fit, fidget, and force it.
Great looking 4 stroke but good luck with that gearbox.
Where did you buy that kit from?

There is a 50 cc 4 stroke class at the next Oct 2nd race
in Apple Valley.
 

Tahq

New Member
Sep 2, 2011
45
0
0
Corona, CA
Re: MB Rockhopper, first build

I bought the kit local from BikeBerry. It is the 2011 Flying Horse 5G HS kit. Bugger on the gearbox, I was hoping a newer kit would provide a more reliable configuration...Guess I let my enthusiasm surpass my research.
The kit came with a six month warranty so I figured I was covered, my short experience to date with BikeBerry has been positive. I guess I will discover if it holds true.
 

Tahq

New Member
Sep 2, 2011
45
0
0
Corona, CA
Re: MB Rockhopper, first build

Well, you were both correct. Did not even make 10 miles and here is the result below, it appears that the problem started with a loose bolt in the case holding the gearbox in place.
This was after my third trial run to check kit stability and re-tighten and adjust as needed. The exhaust gasket went to pieces before I made one trip around the block. I'm calling BikeBerrry now.
 

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Tahq

New Member
Sep 2, 2011
45
0
0
Corona, CA
Re: MB Rockhopper, first build

BB gave me a few directions on fixing gasket issue and said they have had no problems from this version of the hoot and its under warrenty.

Now if I could just figure a way to remove the large gear on the right in the box I might be able to get it up to speed...not budging with pulley puller.
 

Tahq

New Member
Sep 2, 2011
45
0
0
Corona, CA
Re: MB Rockhopper, first build

Gear puller actually busted the gear during removal attempt, unit was damaged from original install/defect. BikeBerry covered with warrenty and I am back together and on the road.