Happytime Essentials for economic improvment

here is a Wiki to further explain engine balance and its importance.
http://en.wikipedia.org/wiki/Engine_balance

here is the article we need to think about and adapt to our setups.
http://www.pocket-bike-racing.com.a...-guide-internal-external-crank-balancing.html

now, we may be able to use the magneto for our external balance. i have a good feeling that this is where alot of our vibration is coming from to begin with. our engines run what is called a "full circle crank" which means we dont have any offset lobes, rather 2 complete circular weights. these are very crude looking to say the least and will most likely need a proper balance.....

http://www.pocket-bike-racing.com.a...sion/7839-balanced-full-circle-crank-pic.html
and above is how we would achieve balance in our crankshafts.


id like to point out that im no guru when it comes to engine building. in actuality i have yet to put my knowledge to trial. But..... i think im onto something as far as a good test bed goes lol

there is no need for any of this... I can go like 45+ MPH all you need is the proper gearing as this engine already produces plenty of torque (enough to already stress the delicate bike parts). You are not building a 700 HP drag racer. You sound like you are just trying to be cool. If you want a better engine spend the money and buy from a more reputable dealer like; rock solid, grubee or, spooky tooth.
 
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i just found this article as well. interesting, its impossibble to totally balance a single cylinder engine technically.
http://www.prestwich.ndirect.co.uk/technical_balancing.htm

and buddy, if you know all about blueprinting and balancing why arent you helping any? i know im going to try and get rid of some of the vibrations, ive played with 2 strokes for 10 years, i do know what im doing.
 
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i just found this article as well. interesting, its impossibble to totally balance a single cylinder engine technically.
http://www.prestwich.ndirect.co.uk/technical_balancing.htm

and buddy, if you know all about blueprinting and balancing why arent you helping any? i know im going to try and get rid of some of the vibrations, ive played with 2 strokes for 10 years, i do know what im doing.

Ok you are right, I shouldn't call you an idiot... I appologize. I just think it is retarded to go through all this. Just buy a reputable engine instead of a cheap one. You bought a $119 chinese engine and you are expecting what exactly? These engines are what they are, enjoy and stop complaining. There is a point when too much is too much and it becomes overkill... you are way past that point. If vibration is the issue get the front mount from ridley, it has a rubber isolator to absorb ALOT of the vibration, much of the rest goes away with a proper break in.

What you are talking about is theory for high horsepower applications. You talk about having to modify the crank and piston assembly to handle the extra performance, the gains you get from port matching the intake is minimal and not near enough to justify any modification on the piston/crank/rod assembly. I wouldn't modify anything on the inside of the engine unless you know exactly what you are doing, you will most likely just shorten the duration of your engines life.
 
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i know its a bit overkill. thats kinda my point. i dont think it shold be expected that these things are as ****ty as they really are knawsayin?
 
i know its a bit overkill. thats kinda my point. i dont think it shold be expected that these things are as ****ty as they really are knawsayin?

yes I know what you are saying. But what kind of gains are you really expecting. I called you an idiot because you are not thinking of the cost/benefit ratio. Is the juice really worth the squeeze? Is it really going to be that much different for the trouble. How much more performance can you get out of these things. It's pretty fast the way it is. I guess what I am saying is that if it isn't broke, don't fix it.
 
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I tell you what, let me encourage you to do more research and talk to a machinist. See what you come up with... if you stumble onto something extra-ordinary, I would definitely be interested. The only problem I see is that with any extra performance you just tax the bicycle components such as the bottom bracket, chains, crank bearings, and jackshaft bearings (which seem to be taxed enough already). If you want a better engine you can buy a better engine. If it is the vibration you can get that front mount.
 
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I know all about balancing and blueprinting engines...

My point is that when you port and polish an engine it is usually where the intake tract splits the air going into the different valves and then smoothing the surface after you are done. There is nothing to port and polish on our little engines, it is just a hole, what would you do widen that hole?... No. You can port match the intake so that the little round opening (most likeley half choked off by the gasket) is the same width as the intake port. Is that what everybody is refering to? I did this mod... dont know if it helped because this is my first MB... but it does have plenty of top end grunt.

and just because you have read some wikipedia stuff on balancing engines does not make you a guru... it makes you sound ametuer. I wouldnt do a lot to the internals of any engine unless you know what you are doing.





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yes I know what you are saying. But what kind of gains are you really expecting. I called you an idiot because you are not thinking of the cost/benefit ratio. Is the juice really worth the squeeze? Is it really going to be that much different for the trouble. How much more performance can you get out of these things. It's pretty fast the way it is. I guess what I am saying is that if it isn't broke, don't fix it.




does your stock bike do 40mph, i bet you think it does. read this book http://edj.net/2stroke/jennings/ then you can come back and join this conversation with a little more knowledge.
 
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