Desert Rat M1

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Onward with the desert rat bike, well of course the bike has taught me the whole way through this gas engine install. Everything had to be modified to make it fit, these dolomite bikes are truly not made for the common bicycle engine.

A new problem occurred with the kick stand, since the bike sets so high, the kick stands are typical bicycle stand except longer and flexible, so naturally the stock stand can't support the extra weight anymore, now I've added a stretched center stand from a scooter, problem solved.
 

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As I said, this project has faught me the whole way through. As you can see the bike is 90 percent complete.

Just two problems left, the jackshaft sprocket is way too close to the oversized tire.
So my solution is to extend the drop ins. Yep I said it, I'm gonna stretch the wheel base out 2 inches. Geez!
 

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The more I try to make this basic kit to fit, the more problems I run into, added problems such as the sprocket center hole is smaller than the hub. In my opinion the gas engine kit for a dolomite will require a lot of modifications to make it work, your best bet will be to convert to electric.

But in this case I want a rugged military look and I feel the gas engine will accomplish that.

Next step is to cut the backbone.
I had same problem with my rear sprocket and Nexus 3 hub. Filed down inside bore few mm, and it fits like a glove. Check in my thread, there's a picture of how it look after filing.
Good luck and take care.
 
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I had same problem with my rear sprocket and Nexus 3 hub. Filed down inside bore few mm, and it fits like a glove. Check in my thread, there's a picture of how it look after filing.
Good luck and take care.
Yeppers, I did hone out the center especially with how minor the size difference was. With this bike it didn't matter, the chain couldn't get around the wider tire without a jackshaft, but these multi speed jackshaft eliminate the need for the rear sprocket that comes with the engine kit. In my opinion the jackshaft kit is worth the 100 dollars.
 
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Well I said I'm gonna stretch this bike 2 inches, goal achieved.

Now with plenty of chain room, all chains will be installed.
Only one problem left to tend too.

I think the newer dolomite are longer, it sure looks better.

20220508_212913.jpg
 

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Now for the final problem, the fact that there is no space for the carburetor with the stock intake manifold.
So I say I'll build my own... ;)

If it works I can finally fire this dog up and see how fast it will be.

100cc with a 7 speed cassette.
 

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Got the intake made and installed but it's to long, by one inch, so no start up today :(
 

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I wish I could say it runs, but there has been a added problem.

Since the jackshaft is multi speed, the way it's set up the rear wheel can't turn the engine. I get half a peddle to start the engine. It's not enough.

So I ordered a pull start for it. Everything else is ready to run. I'd rather put an electric starter on it.


Again, if anyone wants to put a bicycle engine kit on a mongoose dolomite, don't do it.

There are too many modifications to go through to make it run.

The best option is going electric...
 

Son of Kradus

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Wow, just read this build, Man youre so lucky to not have lost the lot in the fire! hope its all going well for you now!
How has the mongoose faired as of late, looked to be a chunky well built little thing!
 

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Well I said I'm gonna stretch this bike 2 inches, goal achieved.

Now with plenty of chain room, all chains will be installed.
Only one problem left to tend too.

I think the newer dolomite are longer, it sure looks better.

View attachment 192740
Nice work on the extensions. They look very durable. I see you have done this before. Did your frame on the almost ticket bicycle start to bend from the motor forces. The reason I ask is I see the random gas powered bicycle from time to time and almost invariably they tramp down the road because the frame has bent. Been a while since I saw this forum feed and I'm very sorry to hear about your house fire. Happy to hear your animals and especially you did not get hurt.
 

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