Roadmaster Mountain $75 & Walmart?

[GorillaTimeMachine]

I have bought the Roadmaster Mountain $75 at Walmart not realizing how small the frame actually is.. I have see post saying this bike will not fit the engine? Is this true?
I'm looking into buying a 2 stroke 80cc engine kit from Daemon bikes on eBay? Tell me what you think im just getting into this hobby so yea..laf

[KCvale]

Did you buy the one in the store, or the largest they have on-line?
The Large looks like a motor will fit to me, it may not be easy, but it is the next shifting bike I plan to build actually.

But why buy a motor off E-pay from who knows?
Just look at the linked ads here or go to gasbike.net and use the $35 coupon.
The 2010 motors have a 90 day warranty and the same price for either color and 48cc or 66cc size.

80cc motors are Chinese math. They are 66cc but more than enough and more than is legal in many states like mine, but they look like a legal 48cc with a simple decal change ;-}

It does look like a motor mounting issue but again, if you got the giggest one and do it right the motor should fit, I have fit them in smaller.

[spad4me]

If you get the angled plug head it will fit better.
I shoehorned a 66 cc happytime into a roadmaster mountain bike because they were offered at clearance prices for $39.00 at the time.
You will have to grind the front engine mount as wide as it will go. Think all the way to the boltholes and even then slightly massage the front tube with a hammer to make it slimmer.
Mount the engine at a slight angle if necessary.
Or just return the bike an get a larger one.
I ran the roadmaster into the ground.
Be sure to lube the wheel bearings on such a inexpensive bike.

[bluenosegoat]

I have built a roadmaster mtn bike- not the latest bike available but the size looks similar. Very difficult- had to drill a hole through the frame to get the throttle cable to the carb and I was using a 49cc engine that had no intake manifold- carb bolted right to the cylinder. My son destroyed the roadmaster and I would not encourage anyone to purchase one with the intent on motorizing- garage sales or craiglist and get a quality bike to start with.

[KCvale]

Thanks for the tip blue.
The last thing I want is a nightmare build.

[bluenosegoat]

here is a pic of the carb and how tight it was!

[KCvale]

Though with most things tight is good, that isn't one of them ;-}

[Cogswelln]

i currently am still using mt road master front suspension mt bike as a motor bike, the rims are junk and will eventually warp and even brake spokes, i broke on spoke in my rear rim out in thye trails. Depending if you want it for street or for off road purposes. I dont really use my motor bike on the road any more. mainly because i have been trying to blow my motor, and still havet been able to. With bikes you get what you pay for unless you find a nice bike at a steal of the price.


I can remember whose qoute it is but it explains it well. "good bikes aint cheap, and cheap bikes aint good." but dont get me wrong ive had my roadmaster about a year or so, and the frame is still solid, had to replace other parts, but than again i love screaming down the trails.

[dag_29307]

Dude I started with a 24" roadmaster from wally world I ran that thing for over two years and it still ran great when I sold it for $200.00. yeah the angleed head would have been great. I just went with a shorter plug, and tilted the carb alittle to the side and she ran like crazy.

[wyldstallions]

I put a 48cc in mine.