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Old 10-21-2008, 02:30 PM
Bikeguy Joe Bikeguy Joe is offline
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Default Re: The best way to 40+mph

I have never been stranded that wasn't my fault...out of gas!
Old 10-21-2008, 04:35 PM
hill climber hill climber is offline
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Default Re: The best way to 40+mph

ht+expansion chamber+shifter kit+ mountain bike=45mph+
Old 10-21-2008, 05:00 PM
i-paint i-paint is offline
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Default Re: The best way to 40+mph

Hi, I think the china engines are reliable and fast with a few changes. I am on my fifth one and have never had one to just die on me. I'm running 38mph with one. I have an expansion chamber and that is really the only thing I have added performance wise. I hope to reach 40mph also.
Old 10-21-2008, 05:32 PM
5-7HEAVEN 5-7HEAVEN is offline
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Default Re: The best way to 40+mph

I would like to build a 6.5 hp push trailer capable of strong acceleration and 40 mph potential, just for kicks. However, with all my motored bikes, I like 20-25mph cruising speed. The roads I travel are too short, congested and filled with potholes to sustain higher speeds.

Even my dual-engine "Mr. Hyde" prefers 20-25mph cruising speed.

Last edited by 5-7HEAVEN; 10-21-2008 at 05:36 PM.
Old 10-21-2008, 05:46 PM
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Motoschwinn Motoschwinn is offline
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Default Re: The best way to 40+mph

Originally Posted by old motorbike View Post
I'd be happy if I just get to 30...
Hey I hit 30 this weekend. With that new airfilter and the exhaust.

I finally nailed it on my Point Beach. Honestly, I don't EVER want to go that fast again on a bike. I'll stay around 20-25....

Kings 70cc 3200+ miles. Now on a Schwinn Point Beach NOW in mothballs..
Old 10-29-2008, 09:22 PM
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Smoothe Smoothe is offline
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Default Re: The best way to 40+mph

I'll have to agree with the folks who like a nice cruising speed of 20-25 MPH. I will probably always be fiddling with these because it's so much fun, but a bicycle just isn't built (yet) to go a sustained speed of 40 MPH comfortably and safely.

A real easy mod is to drill small holes in the plastic air filter cap. I also port & polish, (it's actually, a real easy Dremmel job, just don't get too enthusiastic with it!)
Attached Images
File Type: jpg port & polish 007_1264x948.jpg (613.7 KB, 65 views)
File Type: jpg port & polish 008_1300x975.jpg (632.8 KB, 75 views)
File Type: jpg port & polish 009_1264x948.jpg (576.3 KB, 59 views)
Old 10-29-2008, 09:51 PM
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conradcliff conradcliff is offline
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Default Re: The best way to 40+mph

Wow, I didn't realize that people were still posting to this thread..don't know why I wasn't getting notifications. Thanks a ton for all the replies! Christmas is coming soon so I'm going to really have to figure out what I want to do.

Thanks again for all the info everyone!
Old 10-29-2008, 10:37 PM
thatsdax thatsdax is offline
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Default Re: The best way to 40+mph

I think that 40 is a little too fast for most bikes. I have hit 42 mph once on my Comfort bike. I did this riding no hands !!! Just kidding. I actually had a death grip on the bars. I have been to 60 plus mph on my Mazi Road bike. It felt good. But again. this is a very nice very expensive road bike. It will do 60mph and more down a good hill. It is a fast great handling road bike and built for speed , curves, and will stop on a dime. Only weighs around 18-19 lbs. But.. I would never put a motor on my road bike for lots of reasons. 99.9 percent of us put our little motors on Mountain bikes, Comfort bikes, and Cruisers. Bikes such as these could get you hurt real bad if not killed when going 40+ miles per hour. Once you get above 30mph on one of these style bikes, you are taking a real risk. They just were not made for speed. There are some full suspension bikes that you could safely go 40-50 mph. These bikes run huge 29 inch tires and cost 3000-4000 dollars. My point being.. If you want to cruise 40mph, you are asking too much out of most of the affordable bikes out there. And.. If the cops catch you going that fast, you could be arrested I would think. Next time you are going 30-35 mph, stick your head out of the window of your car. You will see that 30mph or so is really fast. Faster than you would want to fall anyway. If you want to run a Walmart Mongoose 40 mph or so, then you have a death wish for sure. A mongoose? Yikes !!! Don't do it !!! That way you can.. Enjoy the ride...

Last edited by thatsdax; 10-29-2008 at 10:41 PM.
Old 10-29-2008, 11:02 PM
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15rms 15rms is offline
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Default Re: The best way to 40+mph

Look at a robin/subaru 1.6 hp 4 stroke. Staton has a great set up. You can buy their kit. I have 1 on my long wheel base recumbent. With the right gearing 35 wide open is possible. I would tone down your desire for 40 mph. 30 cruising on a bicycle is plenty fast.
Old 10-29-2008, 11:23 PM
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Andyinchville1 Andyinchville1 is offline
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Default Re: The best way to 40+mph

Hmmmm....A low priced / high speed setup?......I'd try a "80 cc" HT , 27T rear sprocket (I've sold quite a few to FL people like yourself), and possibly a Power Pipe.....

I am running a 36T in hilly VA and can reach 34.4 MPH but I am at 6400 RPM (not good for sustained running in my opinion)....So the smaller sprocket should help immensely with RPM's....

You should be able to get 40 MPH with that setup...

Good Luck and please be safe!


PS - Let us know what you end up with and how it did
- A shifter kit would be good too BUT you said you wanted to try to do
it on a budget.
- of course other mods like shaving the head etc... could be done too
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