Thanks for all replies. Where do I get a larger/giant front sprocket? This has been tough for me to find on the web.
My bike has CRANK: Comfort 28/38/48
I don't really want to cruise at slower speed but be "rewarded" by pedaling getting bike to go faster. Funny now I can do 30mph on my bike but now want to do 40... I guess speed is addicting when you feel that air hitting your face. My wife thinks I was a dog in past life becauese I like the wind hitting my face and hanging my head out the window. btw don't really want a bigger motor but want to use "human power" to achieve faster speed. i.e. it would not hurt for me to shed a few pounds and I think I can do if I can make it fun to work out a little on bike.
This is my bike Nishiki Men's Tamarack Comfort Bicycle - Dick's Sporting Goods