How exactly do I port the intake and exhaust?

[StrontiumEthics]

How do I port the intake and exhaust I spent a couple of hours browsing this site, and the things that I have found didnt quiet tickle my fancy. It was really to specific. So how exactly do I port the intake and exhause. What exactly do I have to do. and how to do it. Thanks!

[Ghost0]

Pretty simple really. Here is what I do. First I make a new intake and exhaust gasket that matches the intake and exhaust ports on the cylinder. Then I use those as templates to make my intake and exhaust manifolds match the gasket. A dremel tool with a 3/8 sanding drum works well. Don't over do it, especially if you have an aluminum intake manifold. You will never get it perfect since you can't make something round oval but you can make the transition smooth.

[StrontiumEthics]

And again.. How will this increase performance? Sofar, I was having problems with the engine acceleration, so I removed the baffler, and muffler cap. Now it runs SWEET!!! Since I have a jackshaft kit its like im shifting gears like a motorcycle. I love it . Its a bit loud but I will work something out. Will this porting give me an increase in power? anything along that line?

[Ghost0]

So by removing the baffle on your pipe you did what? Increased the engines ability to flow exhaust gasses. By porting and making sure that your intake and exhaust gaskets are not blocking flow you are doing the same thing. So yes it will increase performance. You may even be able to put your baffle back on. I would recommend cutting part of the tub or drilling holes in the baffle though.

[StrontiumEthics]

Will keeping the baffle off cause any harm? I've read in other threads that they do but fail to see the correlation. What do you think?

[DEATH4OF4]

I Took Mine Out After Break In More Than 4000 Miles Ago. I Left The End Cap On Because Of No Back Pressure Deal And It's Way Too Loud,but I Cut The Baffle Flush With The Inside Of The End Cap. Its Like A Cheesy Makeshift Expansion Chamber. Works For Me. I Did File Down The Exhaust Port, But Forgot The Intake...smart Me.
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I'd Rather Be Riding A Mb Not A Bm.

[Goat Herder]

Originally Posted by DEATH4OF4

I Took Mine Out After Break In More Than 4000 Miles Ago. I Left The End Cap On Because Of No Back Pressure Deal And It's Way Too Loud,but I Cut The Baffle Flush With The Inside Of The End Cap. Its Like A Cheesy Makeshift Expansion Chamber. Works For Me. I Did File Down The Exhaust Port, But Forgot The Intake...smart Me.
.................................................. .................................................. ............
I'd Rather Be Riding A Mb Not A Bm.

I had the same round about Idea recently as well. Only I made a homade baffle at the bottom of the pipe. I still need a little more restriction but not much. This thing is already as quite as a little honda generator. Still not officially a tuned pipe , but what a difference. SBP is about to release a tuned pipe for the Chinas http://motorbicycling.com/f15/sbp-ja...ules-6862.html.

[stv1jzgte]

More on the porting side, I lowered the intake port on mine and raise the exhaust port. This changes the port timing much like a higher lift cam in a car and rpm is increased. more power down low and much more up top, also smoother. As always ride it flat all the time and life will be short.

[StrontiumEthics]

Ok fellas, I just ported my intake yesterday (Thursday), I used a dremel sanding drum, and sat there grinding it down. I managed to increase it to a good amount. Its alot bigger than another intake manifold that I used to compare on an 80cc engine. Now that I made it bigger will I see a big difference in perfomance? Im running it without a baffle, just open exhaust pipe. I cannot start the engine b/c I ordered some parts for it. Where will I feel the pull? Low end, high end, or both? Do I need to adjust anything else?

[Pablo]

You'll need to do the same on the exhaust manifold.

What are you using for gaskets?