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Old 09-30-2011, 09:39 AM
edgecrusher72 edgecrusher72 is offline
Motorized Bicycle Newbie
Join Date: Sep 2011
Location: PA
Posts: 1
Unhappy Fed up need some help

Hi i'm new to motorized bicycling. I don't have much money so I tried to go the cheap way and have had lots of problems. I bought a skyhawk 80 and put it on a mongoose mtn bike from k-mart. Had a very hard time finding an affordable mtn bike with enough frame clearance. The Engine was difficult to mount cause the bike has a large oval front frame tube. Have had to modify almost every piece that went on the bike. Got it all together and the chain doesn't even come close to lining up. Got it close as I could and every 10 feet the chain pops and gets lodged between the sprocket and spokes and bent the spokes and broke the chain twice. It seems like the sprocket needs to be touching the spokes to even get it close. I have had this thing for months and haven't even gotten it started yet. I'm ready to trash the whole thing.

Last edited by edgecrusher72; 09-30-2011 at 09:53 AM.
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Old 09-30-2011, 09:54 AM
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DaveC DaveC is offline
Motorized Bicycle Elite Member
Join Date: Jul 2010
Location: Boise, ID
Posts: 967
Default Re: Fed up

Hi and sorry that you have had problems with the mounting of your motor. It's totally true the choice of bike has a lot to do with how easy it is to get going. An awful lot of bikes just are not good for conversion, even with a lot of work.

Post photos, a good deal can be figured out from looking at the problem. Chain coming off could be as simple as turning the sprocket over, the off set teeth should be on the spoke side for most installations. Without a photo hard to figure out.

There's a lot of help here. We can get this figured out

edit: plus I see your in PA. There are many here from Penn, depending on where you are chances are there's someone close to you that might be able to help you out. Even here in Boise, Idaho I've had people over here several times working on their bikes getting them going.

It's a community thing

Last edited by DaveC; 09-30-2011 at 10:00 AM.
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Old 09-30-2011, 09:55 AM
stig stig is offline
Motorized Bicycle Newbie
Join Date: Sep 2011
Location: WA USA
Posts: 7
Default Re: Fed up

look for a used older bike on craigs list sometimes you can find them from $20 to $60 if the people just want them gone. make sure its round down tube.. and the oval tube is probably most of your problems and might also be the reason why it wont line up right!
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Old 09-30-2011, 12:06 PM
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Saddletramp1200 Saddletramp1200 is offline
Custom MB Buiilder
Join Date: May 2008
Location: Houston, Texas
Posts: 1,418
Default Re: Fed up

Edge Welcome to THE Forum! I have two Mongoose MTN bikes. Easy fix, large tube frames. Use steel, or some other metal to make a front mounting plate that will bolt to the motor. Use a U bolt to go around the frame and bolt to the plate. $5.00. Flip the sprocket over on the rear wheel so the teeth are on the outside. Alignment is a must! The sprocket must run true. It takes time. Flip the bike over and sit behind it, chains off. Spin it. Has to be strait. I use stainless steel cap screws and Aircraft nuts on mine.
Only Bikers know why dogs love to stick their heads out of car windows,
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Old 10-01-2011, 10:37 AM
cwdtx cwdtx is offline
Motorized Bicycle Newbie
Join Date: Oct 2011
Location: Connecticut
Posts: 1
Default Re: Fed up

Hi! I have the same problem,I bought the same bike as you,getting ready to go out to the garage and give it another try
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Old 10-01-2011, 03:18 PM
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2door 2door is offline
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Join Date: Sep 2008
Location: Littleton, Colorado
Posts: 16,224
Default Re: Fed up

Got time for a little reading on the subject? Have a look here>

Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"
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