80cc Bike Kit on a Wal-Mart 700c Thruster Fixie Bike

Hey!
This is a build thread for my 80cc kit (black) and it's instillation of a Thruster Fixie.
So far, I have built the engine (from parts), installed it on the bike, ordered and installed new grips, mounted the sprocket on the back wheel, sized the chain, and most importantly broken one of my cylinder bolts in half, and am now waiting for a new one in the mail.
Here are the pictures of the build. I will upload more when it's finished, (next week or in 2 weeks)
I will also make a video and post a link when done!


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All progress will be simply put into the OP as an update, so you all don't need to scroll through to find updates.

Thanks!

Emilio
 

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I'm not big on motorizing road bike frames but that bike would look absolutely sick with the black engine and a billet aluminum head
 
You do realize that having a fixie pedal side is going to beat your legs when you use the motor right?
 
You do realize that having a fixie pedal side is going to beat your legs when you use the motor right?

The Thruster 700c has a flip flop hub, I imagine he's smart enough to be using the freewheel side.
 
I'm not big on motorizing road bike frames but that bike would look absolutely sick with the black engine and a billet aluminum head

Yeah I am concerned about vibration because, using this bike there will be alot.. I am building a sort of motorcycle style bench seat with more padding and plan on putting bigger tires on there though. We will see!

You do realize that having a fixie pedal side is going to beat your legs when you use the motor right?

lol, luckaly this bike does have a wheel with two different sprockets on the back hub, one fixie and one freewheel. I have the drive train sprocket attached onto the fixie, and the freewheel acts as normal.

The Thruster 700c has a flip flop hub, I imagine he's smart enough to be using the freewheel side.

That's correct, thanks.
 
Does anyone know:

I have broken one of my cylinder bolts trying to torque it down (obviously too much, as the torque wrench was broken) and have tried ordering new bolts 2 times. Each time the threads are different, but not correct.

My question:
Can I tap the actual engine so that I can use these new bolts I just bought...

Let me know what you all think of this idea.

Thanks
 
Mine is retapped for all SAE bolts and studs because I had SAE stuff on hand. If you know how to tap a hole you can do it.
 
Mine is retapped for all SAE bolts and studs because I had SAE stuff on hand. If you know how to tap a hole you can do it.

Here is a Stock bolt, next to a new BGF bolt that I would need to tap for. As you see, they are slightly different in length, will this become a problem?

I will figure out how to tap it if it looks like a likely solution.. I can get help from a friend who is a welder/machinist.

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Which bolt is which? I doubt the length will be an issue, particularly if the longer bolt is the replacement.

At least in the picture, the threads look the same to me. The one on the right just seems to have shallower threads than the others.
 
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