New member - Install on Roadmaster from Walmart

ryan83 · #1 (**permalink**) 10-06-2009, 07:15 PM

Hey everybody I'm Ryan I'm a new member from Illinois. I have a 26" Roadmaster mountain bike I got from walmart and I have an 80cc engine kit coming in the mail from boy go fast on ebay. It seems that some people have had trouble fitting this kit on the roadmaster bike. Anybody have any experience with this bike going with this engine? It's too late to return the bike at this point. Thanks in advance for any help.

FileStyle · #2 (**permalink**) 10-06-2009, 08:07 PM

what part of IL are you from? Iam from Decatur area.

ryan83 · #3 (**permalink**) 10-06-2009, 08:25 PM

I'm up north by Aurora/Elgin

bandito · #4 (**permalink**) 10-07-2009, 05:39 AM

Is that any where near obama ill? or hussein ill, or barak ill?

Charged-Reacter · #5 (**permalink**) 10-07-2009, 06:45 AM

I sold my first motorized bicycle the other day and it was the
Roardmaster mountianbike from Walmart. I used the 80cc slanthead
-plug engine from zoom. This engine is a very tight fit for the bicycle.
To get your intake and carburator into the space you must take out the
studs and put carburator on intake and stock air cleaner, you will rough up
the black plastic on the air cleaner and it will fit tight against the down tube.
The clutch arm must be cut down and a hole drilled in it for the clutch cable to
go through it. The front stud for the engine mount must be cut down for the exhaust
to fit. For a $77.00 bicycle from Walmart and a not proffessional build ,it did work.

ryan83 · #6 (**permalink**) 10-07-2009, 10:47 AM

Quote:

Originally Posted by bandito

Is that any where near obama ill? or hussein ill, or barak ill?

HAHAHA yep

ryan83 · #7 (**permalink**) 10-07-2009, 11:03 AM

Quote:

Originally Posted by Charged-Reacter

I sold my first motorized bicycle the other day and it was the
Roardmaster mountianbike from Walmart. I used the 80cc slanthead
-plug engine from zoom. This engine is a very tight fit for the bicycle.
To get your intake and carburator into the space you must take out the
studs and put carburator on intake and stock air cleaner, you will rough up
the black plastic on the air cleaner and it will fit tight against the down tube.
The clutch arm must be cut down and a hole drilled in it for the clutch cable to
go through it. The front stud for the engine mount must be cut down for the exhaust
to fit. For a $77.00 bicycle from Walmart and a not proffessional build ,it did work.

Cool man thanks. That's good news that it will fit at least and the modifications don't sound to tough...

ryan83 · #8 (**permalink**) 10-11-2009, 03:23 PM

Ok so I got everything put together, but there's just no way the carburetor is gonna fit. Anybody have have this problem? Is there some stuff I can get at the hardware store to mount it somewhere else on the bike and run a hose to the intake?

**2door** · #9 (**permalink**) 10-11-2009, 03:28 PM

Ryan,
Many guys have fabricated a custom intake manifold using copper plumbing fittings. You'll need to be good at soldering. Another alternative is this. > INTAKE
Tom

Cabinfever1977 · #10 (**permalink**) 10-11-2009, 06:55 PM

i use a roadmaster bike on my first build and it was not fun but it did run and look good when i was done a week later.but i bought it used like new for $20. i mounted the carb off to the side using 90% curved copper pipe fittings and the spark plug and boot will be a very tight fit.
clamps will not work for the pipes,i used jb-weld but didnt hold very well,i reccomend soldering them.or you could shorten the intake pipe and modify the air cleaner.

im now using a scwhinn del mar cruiser bike,has plenty of room for engine and bike was only $99.