???preformace options???

What kind of 2 stroke motor are you planning to modify?

The answer is complicated and probably not what you want to hear.

If you want heart stopping performance and more power than you know what to do with, buy a Morini S6S, get it custom mounted to a frame, and away you go. It'll be cheaper in the long run.

If you want something fun to play around with that will carry you around at about 30 mph, a chinese bicycle motor will do just fine. But after swapping out the cylinder, piston, head, and probably crankshaft for Puch parts, swapping the carb for a Dellorto, getting custom exhaust fabricated, a shift kit to take advantage of all that extra power, and totally redesigning the clutch to handle all that extra torque, you'll probably be at least a grand in the hole, if not more.

There's a lot you can do with a stock motor to improve performance and reliability. read up on 2 stroke tuning and port matching first.

And please PLEASE remember what a comma and a period are for. Makes it easier to answer people's questions when you can read them on the first try.

HI,

Your post seemed to focus primarily on power enhancing techniques BUT I believe the best "bang for the buck" speed wise would be to go with a smaller rear sprocket.

Hope this helps you.

Andrew

Well, get a jackshaft kit - then you have a whole array of gears.

Racing fan.....
While all this back and forth b.s. goes on and on about your upcoming build,
I can't help but to wonder about a few things, so I have a few questions for you that maybe you could answer. I want to help us all try to understand where you're going with this thing.

1) What kind of budget are you working with for your bike?

2) What is your level of mechanical ability? Do you have access to a shop with tools, welder, etc...etc ?

3) Do you already know a lot or a little about fabricating with metal or is this a new learning experience?

4)How much do you know about 2 strokes.?

5) How about bicycles, do you ride? Do you know how to work on and repair
everything that is "bicycle"?

This hobby is all about having fun and building something that is unique that you created with your own hands
.
It can be frustrating at times because most builds require thinking, building, re-thinking, rebuilding... because some things you do work out, and other things you'll find don't work out and you need to change them.

You also have to remember that you are building a bicycle for Pete's sake.
These things were never designed to go very fast and overpowering one can be quite dangerous if done incorrectly.

If you want a motorized bike build one, but do it within your means.
If you think it's a high powered motorcycle. it's not, and won't ever be.

Think about what you want, what you're capable of, and what you can afford.

Until you do,.... talking about it doesn't get it done.


TiM

You got some good advice from timboellner, worth reviewing again, and I think if you check closely you'll see the folks using 9 hp engines are seasoned builders with race bikes who worked the learning curve and made their mistakes first with much smaller engines. Besides, no state regs that I know allow that kind of hp.

JUST DO IT!-one step at a time you get there if your a die hard gear head

I will tell you this. DO NOT buy from kingsmotorbikes or gasbike. They are the same company, and the biggest supplier of grubee kits. They also happen to SUCK at customer service. If you want a grubee kit, find another supplier. Or do some research and look at the different kits available. Their are quite a few suppliers out there, and quite a few different brands of engines available. As far as the mods go, be careful. When you make ANY modification to a kit motor, you void the warranty. Also, when it comes to these engines, forget most of what you know about two strokes. While they may operate the same as any other two stroke, they are CHEAP CHEAP CHEAP. Why do you think you can get the whole kit for $150?

Wow, nobody said anything about that retailer. Calm down butterbean.

Send an email to all the dealers here and on eBay. Make your decision on who answers and who don't. Give then a few days to get back, 3 at the most, with preference to those that answer right back.

If they will talk to you before a sale then most likely you will be able to deal with them later if a problem pops up.

The aftermarket dealers like Pirate and Sick Bike Parts will answer you right back. I don't really know about others. boygofast on eBay will, too. When I had a problem with a BGF motor I talked to Ricky Shi on the phone. He got the problem solved.