Cheap tuned pipe.

[SlowBalt]

I bought this pipe off e-bay for $25 new. All I did to make it fit was stand on it and gently bend it a bit, and make a simple mount for the back. Performance is night and day over the stock pipe.

 

[obd1kenobi]

That pipe is Kick Ass! Do you have a link to where I can find it?

 

[SlowBalt]

This is the same pipe from a different dealer. If you keep checking eBay for "pocket bike exhaust" they always pop up http://www.minibikepartsnow.com/partspage/exhaust-st-pb.html
But as I seed before, It's not a direct bolt on you have to stand on it and gently straighten out the bends.

 

[SlowBalt]

This one is on sale for $21 Mini Pocket Bikes > MTA1 Mini Pocket Bike > Stock Parts - Part Name: Exhaust - Stock, Cag

 

[ruppster]

Good find! I'm eyeballing the 19mm mikuni carb. I wonder what you have to do to get a throttle cable with the right ends.

 

[MxG]

will this fit n 66cc/80 skyhawk engine???


n do these work like n expantion chanber??

 

[SlowBalt]

Good find! I'm eyeballing the 19mm mikuni carb. I wonder what you have to do to get a throttle cable with the right ends.

I beleave it uses the same ends.

will this fit n 66cc/80 skyhawk engine???

n do these work like n expantion chanber??

No and yes. No you have to straighten out the bends a bit,then yes it will.
And yes its an expanshion chamber.

 

[MxG]

Bout how much more speed did u gain ??

 

[SlowBalt]

Not much speed .May be 3mph. But more hp threw the whole rpm range.
Now it's like, what hill?

 

[SlowBalt]

More pics of the pipe

 

[stuartracing]

Good Find..........

 

[timboellner]

Same pipe I've been using for the past year. After researching it on a pocket bike forum I found the trick to this pipe is to get inside of it and get the extra 2 inches of straight tubing out of the inside of the cones at each end. The welds where they meet the cones clogs the openings a lot. I tried shoving a piece of 3/8" all thread into it and realized how much weld closed up the inside of the pipe- to- cone connection. I lengthened the belly of mine about 3" with some 2 1/4 auto exhaust pipe. Heat shielding the outside of the pipe is a must or it will ruin your day. I wrapped mine in some perforated aluminum to block the heat from barbecuing my leg. Check mine out..
It sounds nice, and has that 70's dirt bike retro look.

 

[foureasy]

both of your pipes need to be longer. about 38-39 inches will help you realize the power band, but you are definitely not ever "on the pipe"

 

[SlowBalt]

Actually ,I have so much power it accelerates up steep hills, and tops out at 38mph on a 41tooth.

 

[timboellner]

Foureasy: Thanks for your input on my pipe. You said the more ideal length is 39".
Can you give me some suggestions on which section I should extend?
Current pipe length is 32" and breaks down as follows:
Header pipe with ells .............. 11" 7/8" OD
Divergent cone........................ 4.5" 2 1/2" OD
Belly...................................... 3.5" 2 1/2" OD
Convergent cone..................... 4.5"
Stinger.................................. 8.5 7/8" OD
_______
ttl length 32"

I know that you know your stuff.
I have a pocket bike pipe like SBP's chrome exp. chamber sitting in my basement unused if you think it's a better choice. Thanks,
Tim

 

[foureasy]

by far the easiest is to add to the header. start there adding like 5 or six inches, then try adding to the belly an inch or two at a time. with those cone angles being equal, there wont be a huge hit, but there will be a very obvious power gains. though not necessarily on the first try. the variable here is your exhaust port timing, but remember that the longer the distance that the pressure wave has to travel, the lower rpm the "power band" will be. with a 32 inch pipe, your peak power is somewhere around 13-14000 rpms.


@slowbalt - my bike also does 39mph with a 41t sprocket and 24.5in tire. which puts me at 9500

 

[ken murphy]

I bought this pipe off e-bay for $25 new. All I did to make it fit was stand on it and gently bend it a bit, and make a simple mount for the back. Performance is night and day over the stock pipe.

I bought somthing like that also here's mine i did a lil more work on it

 

[stuartracing]

I bought somthing like that also here's mine i did a lil more work on it

Sweet pic. OF the dogs.....lol...

 

[oldtimer54]

How loud are these pipes? I wonder how hard it would be to get one of these to fit under insted of over? Has any used one of these pipes tucked under?

 

[oldtimer54]

I bought this pipe off e-bay for $25 new. All I did to make it fit was stand on it and gently bend it a bit, and make a simple mount for the back. Performance is night and day over the stock pipe.

How loud is this pipe? What does it sound like? I dont want a loud screaming pipe. I would like a pipe with a nice deep tone and I can realy use some more power for the hills. Thanks