First I want to say thank you to everyone replying....I really do appreciate the advice!! I will go with a 2 cycle name brand engine. I will also go with a name brand.

After I posted this I had a conversation with my father about the project and I have a few more questions now.

1. He mentioned that he didn't think that motorized bicycles had the ability to be basically placed in to neutral so that you could choose weather you wanted to use the engine or just pedal the bicycle like a standard bike with no engine... I did not realize that... I just assumed I'd be able to use the bike for exercise and then when i was tired or got stuck somewhere I could just kick the engine on and be on my way... is this not the case?

2. I see there seems to be two major types of motor styles. there are some which are mounted on the center frame and attach by gear to a rear wheel sprocket. Then there is another type which rolls on the tire and attaches above the rear tire.... what are the advantages/disadvantages of these types? with respect to my trip across the country and desire to be able to pedal and use the engine seperately....is there a better choice?

3, I am also going to be buying a new bike... I want something that is excellent on the road, but also can handle a few hard bumps and minor offroading... anny suggestions on which type of bike? my price range for the bike itself is under $700 and I will probably be looking on ebay for the bike... but i'm thinking if i can't pedal it..... then i might as well just get a cheap road bike from walmart and mount it..... i'm leaning towards a middle of the road ...road bike.... with straight handle bars and thin tires but with aggressive tread...anny ideas?

I think after these questions i'll pretty much know what i'm looking for and i'll keep you guys informed how the project goes if you're interested to hear about it.... have a great night!!

Jamey