exhaust modding.

linnix13

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Mar 6, 2009
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Location
dundas ontario
i have a 80cc 2-stroke Chinese engine. i drilled a 1/4" hole next to the original hole on the baffle on the muffler. and it makes the engine slightly louder and deeper sounding. but it gives me more than twice the power and alow's me to do 55kph as appose to 40kph stock. it also allows me to d0 30kph up hills where i would usually do 14kph. and it makes my acceleration amazing! more than triples it. i go through slightly more fuel but thats ok. so are there any dangerous side effects from this? im ok with having to replace the top end sooner because its only 40 bucks from the manufacturers website for a hole new top end. but could it throw the piston or result it catastrophic failure? ive ridden it for almost 500km like this and it seems fine. thanks
 
just thinking that your engine was not made for such speeds

backpressure -- lacking of -- may be a problem

if replacement monies are no problem -- have fun

if you are looking for a long lasting relationship
treat her right...................

as you ride the motor bike thing
 
i would love to see a picture of this mod. i would also love to try this!

sure il post a picture of it! how do i do that??? and in the pick there are 3 holes you only need one. here is what i found, with 3 1/4" holes open the engine sounds deep and very loud, it has almost 3 times the acceleration of stock but you loose about 15 kph of your top speed, with 2 holes it is still loud and only twice the acceleration but you still loose about 7kph of the top end. now with one 1/4" hole you have around 0.4-0.6 the acceleration and you gain about 8kph top speed. and it sounds the same as stock except its very poppy sounding, you can hear the air being forced through the hole and it sounds slightly deeper. all in all you gain probably 14db for sound and gain alot of speed and power and i havnt noticed any worse fuel economy or plug fowling. now how do i post that pick?
 
there are a million ways to do this, my favorite may not be the fastest, but it is the easiest way to show them off is to host them directly..

or, if you want, just e-mail it to me and ill host it
keylang@cfl.rr.com


1. snap the picture with your digital camera
2. transfer to your computer
3. go to www.imageshack.us
4. browse to your photo
5. select the resize option 800x640 or whatever is closest to that
6. upload
7. find the code it gives you once uploaded
8. you are looking for the code that starts with IMG
9. copy paste into your thread or even into a reply to your thread

Moddy Edit: We do NOT use IMG tags at MBc.
 
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there are a million ways to do this, my favorite may not be the fastest, but it is the easiest way to show them off is to host them directly..

or, if you want, just e-mail it to me and ill host it
keylang@cfl.rr.com


1. snap the picture with your digital camera
2. transfer to your computer
3. go to www.imageshack.us
4. browse to your photo
5. select the resize option 800x640 or whatever is closest to that
6. upload
7. find the code it gives you once uploaded
8. you are looking for the code that starts with IMG
9. copy paste into your thread or even into a reply to your thread

We don't use IMG tags here.
here is a link to how to load pics on MBc.

http://www.motoredbikes.com/showthread.php?t=9817
 
it wont be 14db, 3db is a 2x 'loudness' increase to your ear...

i dont know when i have my headphones at 84db then i crank it up to 100 db(max) it sounds about the same as my muffler, oh and im talking right at the muffler tip not where i sit or as a person would hear it going by.
 
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