• Register now! It's free and easy.
  • Show your bike to the world, upload a photo today!
  • Hi Guest, did you know we have a dark style? It might be easier on the eyes at night time! Try it out here: Style Chooser

expansion chamber

G

gauge

Guest
DOES ANYONE THINK THIS WILL WORK and will be worth the money my dax 70 barley does 30 mph and need more low end power
 


5

5-7HEAVEN

Guest
:cool:what is your rear sprocket?

a 44-tooth sprocket will have lots of low end, and cheaper than expansion chamber.
 
A

andyinchville1

Guest
Hmmm interesting idea BUT that pipe is for a 49 CC engine....In order to maximize the performance of the tuned pipe it has to be designed specifically for a particular engine...Has a lot to do with intake / exhaust opening timing , RPM range etc..Still the pipe may be more beneficial than the stock muffler....Looks to need some minor bending and fab work to get it to fit to the Dax engine....If you do it, let me know if it works cause I have the Dax 70 also....FWIW my 70 also does about 27 MPH max on the std 44 T (lotsa Revs!)...If you want more top end a smaller rear sprocket would be the cure although this would lower acceleration and low end pulling power...

Andrew
 
G

gauge

Guest
i have the 44 tooth but i was doing about 32 out of the box i did the exhaust mod with or with out change the needle position the bike now does 28 and its runnig the same rpm. im mad, but now i can only do 15 cause im pedaling for now cause my throttle cable broke
 
A

andyinchville1

Guest
Same RPM and slower speed??...Unless the gearing was changed you should be going the same speed....Maybe the engine just seems slower with the lower tone caused by the exhaust mod?
 
S

stinger48

Guest
check the sparkplug and see if the engine is running lean(dry white to grey colour plug =lean) (biscuit brown colour plug =good) (black=rich) you may need a larger main jet or get yours drilled out, i always set cruise with the needle and flatout is set by main jet ,take your time to get optimum results if its too rich it wont revout or if its too lean will rev to the moon but it will cause meltdown of piston ,in between the two is perfection (power and economy) :D expansion chambers are not the easiest thing to make or design or tune.also the standard air filter may not be the ideal choice to go with the chamber ,inlet and exhaust pulses in the manifold have great bearing on power if you get a larger air-filter and you will have to change the jetting .it sounds like a lot of mucking about but can reap double the horsepower!! :cool:
 
Last edited by a moderator:

Chuck L

New Member
Joined
Jun 5, 2008
Messages
25
I used the exact same pipe on one of my 48cc builds and it worked just fine. I cut the pipe at chamber and after the bend coming out of head and rewelded.the chamber mounts under the bottom bracket and the muffler exits out by the left axle nut.Would show pictures but don't know how to upload yet. Don't know how it would work on a larger but it has to be better than stock.
 

Pablo

Well-Known Member
Sponsor
Joined
Nov 9, 2007
Messages
1,847
DOES ANYONE THINK THIS WILL WORK and will be worth the money my dax 70 barley does 30 mph and need more low end power
I can tell you after you port your intake and exhaust, an expansion chamber will make a large difference.
 

Attachments

Top