what motor should i buy?(this will be my first build)

[andyszyd]

hi well i want to build a motored bicycle and i wanted to know what motor would be best for me to use.i would be looking more toward a 2 stroke but i really dont know the advantages of a 4 stroke and if you could give me tips to decide.also i dont know if the police or legal services in my area would know the difference in an 80cc more or a 49cc motor so should i go with the bigger cc?all in all im clueless on these things so any advice at all concerning my issue would be help!

to proffesor about the last of me:i think i expressed myself wrong but indeed showed my ignorance on the whole issue, but i really think that all of you have really good responses to that issue and since then i have changed my way of thinking.

Good advice so far, the bottom line is:

If you want to play with it and "work on it" most of the time buy cheap China 2 stroke (HT engine). You"ll be "playing" with it more than riding it.

If you want to "RIDE THIS THING" buy Subaru Robin ECO35, HondaGX 35, Honda GX 50 Mitsubishi TLE 43, Tanaka 40, also China clone engines like Titan 50cc, Huasheng50cc Mitsu clones 52cc and others are much better quality than HT engines, lots of people on this board are happy with them.

I am a newbee too, just build my first MB (BMP coupled to Subaru Robin 35) riding it every day. Now I am working on pump engine from Harbor Freight (Very powerful Mitsubushi clone 2 stroke 52cc) to put it on my other bike.

I bought brand new Subaru Robin from Silvaire, with centrifugal clutch very good price and service. He may still have some left.

Some people put 30000 miles + on Subaru Robin ECO 35, 200+ MPG, 4 stroke quiet little gem.

Have fun!

 

[flashstar]

I own a 300zx and it is a machine that usually requires more tinkering than driving. This was why I opted for a HT. I'm not afraid to spend some time working on the bike every once in a while. In my case, I spent $130 for a DAX HT and put another $200 into tools and upgrades for my bike that I needed anyway. For example, I got a 40 tooth sprocket and top hat adapter (which are pretty much flawless) so that my rear sprocket will be completely true.

The accessories that come with the HT kits are for the most part ****, however I believe that the engines themselves should last long enough for anyone's use. When one fails after a long life, just spend $60 and pop another one in! Any China stuff that fails can usually be upgraded with quality components.

 

[motorpsycho]

I don't know...I have a 50 c.c. slant head (china 2 stroke) and it's an awesome little engine in my opinion. I can pull away from my friends 80 c.c. on the top end and it actually revs faster than his 80 c.c (china engine). the 80 c.c. has a little more low end torque for better take off but really, it isn't THAT much of a difference to me.
I only weigh 150 lbs and my bike is a 20" schwinn lowrider.
there are a lot of different factors when it comes to trying to figure out what c.c. engine to buy (and which one to buy). I got the china engine simply because i got the entire kit for $114.00 with free shipping. I went with the 50 c.c. slant head because i am using a small 20" frame, and the slant head gives a tiny bit more clearance between the spark plug and the top frame tube. The only things that i have done to my motor was to add a high-flow air filter (k&n style) and a spooky tooth expansion chamber. those 2 additions made a HUGE difference over the stock pipe and air filter. my top speed went from 24 mph to 32 mph with the stock 44 tooth rear sprocket.

 

[Bible Man 20]

where did u buy your engine?

 

[motorpsycho]

where did u buy your engine?

I bought my engine kit off e-bay from "boygofast".
a lot of people have said that they had problems with this seller (bad engines, bad service, slow shipping, etc.) but I had a very good experience buying from them. It only took 3 days for me to get the kit, it was in perfect condition and all parts were accounted for.
one thing that i did notice is that the casting of the 50 c.c. slant head is a lot better than the casting of my friends 80 c.c. (he also bought his from boygofast). The cooling fins on my 50 c.c. are a lot beefier than the ones on his 80 c.c. and the casting is much cleaner.
one thing tho (and i'm pretty sure that this goes for all of the cheaply priced china engines) is that the hardware (nuts & bolts) are very low quality. I would suggest going to menards, lowes or a hardware store and getting better quality nuts & bolts. You will also want to use blue lock-tite on all of the nuts & bolts.
I've had my motor on my bike since august 2009, and I don't have that many miles on it yet. I don't ride it every day, i just ride it on occasion for fun.