Exhaust on but...UPDATED video  By  Deleted (Read 1,669 times)

www.ebay.com/itm/390563575153?item=390563575153&viewitem=&vxp=mtr

50 bucks

I have yet to buy a system that fits. 3 so far

Believe me, I KNOW what you're talking about... LO not so L...

With most of these scooters being sorta "cookie-cutter" designs, you'd THINK they'd most all take the same exhausts. WRONG!

On just the 150 GY6's alone, there are at least 2 different angled exhaust-ports (which can angle your exhaust far out, or in toward the wheel) and Lord only knows HOW many different muffler mounting setups.

On the good side, the picture of your scoot appears to show the typical two strap/band muffler mounts. Trust me, you CAN devise SOMETHING to make those bands go around an aftermarket muffler, AND bolt up to the factory attach-points. Worst-case (like MINE) where I got real creative, and used a tapered cone muffler, you can still bend the straps, mount them to a piece of bar-stock, or angle-iron, and drill that to fit onto your scooter's mounting hard-points.

Check my photo below for reference... My exhaust must be one of THE worst examples to mount, but it still was fairly easy. Just took some time.


lightshot free download


screenshot green

The weird shape of my "muffler" or whatever you want to call it, made it impossible to mount the straps to the original hard-points. So I bolted them to a piece of bar-stock, drilled to fit the scooter's hard-points. You can see I drilled them WAY "cockeyed" to re-angle the exhaust because it aimed too high. That's one advantage to mounting the muff to a bar, and mounting the bar to the scooter. With a straight, cylinder-shaped muffler though, that wouldn't be necessary.

If you're going with a muffler even SIMILAR to the cylindrical-shaped factory version, it should be possible to get it on with only some washer/shims, and/or gentle bending of the header. Just be SURE the finished system does NOT put twisting stress on the head where it bolts up. THAT can cause problems. Get the bends and angles right, so you don't have to force it into position.

As "Red Green" says: "...I'm pullin' for ya'... we're all in this together..."

Leo in Texas

Jerseyboy,

Thanks, but it LOOKS a lot meaner than it SOUNDS... LOL! Really! It's actually a pipe for a 50cc GY6 4-stroke. I suspect they are the same pipes used on a 2-stroke though.

These do WONDERS for a 2-cycle... when set up right, at the rpm they're tuned for, they pull the fuel-charge (plus EXTRA...) clear through the combustion-chamber, and ram it back in, for a TRUE supercharging effect. They can nearly DOUBLE the power of the little buzz-bombs. I learned about them WAY back in the 1960's when I was into go-karts.

A proper expansion pipe could turn an already-hot 125-175cc McCulloch kart motor from a 12 hp 12,000 rpm "chainsaw" mill, into a 20 hp 27,000 rpm 140 mph screamer!

The UNEXPECTED side effect of these is that they also improve performance (slightly) on a 4-cycle engine.

Apparently, the "expansion" portion helps to scavenge the exhaust, pulling it down the header as it expands into the chamber. It's nothing like the effect it has on a 2-stroke, but it is still better than a simple "straight-pipe". My Xingyue 150 has never run better than with this setup.

As for the sound, it doesn't sound nearly as bad as it looks... LOL! At idle, and up to mid-rpm, it's actually QUIETER than the stock muffler. At WOT, or under hard acceleration, it's only slightly louder than the stock muffler. Just a little more "bark". Amazing, considering there's not one baffle anywhere in the system.

On a 4-cycle motor, these 2-stroke type exhausts actually provide better performance than a loud straight-pipe, with fairly quiet operation, and they seem to make it easier to tune the carb, and work very well with a performance CDI. They're sort of the best of both worlds...

A few 4-stroke scoots use these from the factory... Some Vento brands have them. I did a post on the conversion... It's still in here somewhere. My original post was mainly to show how to make a 1-inch inside-diameter header with flex-tubing so you could get really free breathing, and have enough "wiggle-room" to connect up to most any muffler you want to use. I put these pix in this reply to show how you can mount just about any system to any scooter if you get just a little creative.

If you want something different, hot-looking, and runs great, I can recommend these expansion-chambers for your 4-cycle engine.

And, I can also REALLY recommend upgrading the factory 3/4" I.D. header with a full 1" I.D. header. I made one from a John Deere generator header, but you can find 1" GY6 headers ready-made. They really DO make a big difference!

Here are pix of the header... I find it incredible that the factory equips these GY6 150's with a header a full quarter-inch SMALLER than the exhaust port!!! THAT chokes off the exhaust less than ONE-INCH from the exhaust valve... even before it can reach a performance muffler. That alone must cause these engines to run hotter than they should... Here are a stock pipe, and my 1" I.D. pipe for comparison...


screenshot by lightshot
screen shots

Hope my experience may help...

Leo in Texas

No the hole is fixed. Thats the sound of the exhaust.

Get that thing welded up at a muffler shop so you don't have to worry about it and the pipe looks seamless. It is looking good and sounding good. Purchasing an exhaust is scaring me because I know it will have to be man handled to get a good fit.

Time will tell. It may just be the luck of the draw but I have never had a lot of success with band aid fixes from the auto store. I do sincerely hope I'm wrong