Home brew YT175 Porting / Reed upgrade

[Vealmonkey]

Some of the things about 4 stroke porting on here are really amazing me. Alot of bad info in my opinion. 4 stroke porting is not idiot proof firstly. Also, there are gains by porting 4 strokes as well. IF you don't believe that, than just look to any 4 stroke drag racing machine. Pro Stock cars, Pro Mod cars. Granted, they are making way better parts nowadays then they once did, but equipment still needs fine tune porting and polishing. Many people made their livelihoods from rewelding and reshaping intake and exhaust ports on different machines. It's also very easy to overport 4 stroke parts and reduce them to junk. Or to weaken the spots where vavle guides are driven in a head to the point where they will crack and cause major problems. There is a big difference between match porting parts and for altering intake and exhaust runners to enhance perfomance. I don't claim to know much about 2 stroke or 4 stroke porting. I leave the real work to the professionals.

[bcredneck]

i said it was idiot proff after some reading of corse a retard with no brains could screw up a head but 4 stroke porting is 100 times easyer than on a 2 stroke anyone can do a little research and do a good job ive even done it on my xr75 and i used a port book on a 75 yz250 that the owner test rode on staight gas and blew he said it when faster but ill never know

[RubberSalt]

I know my dad hassome heads for his old plymouth that he used to race. The walls where so thin, he built them up with atleast a half inch of jbweld. I bet he wishes he could weld aluminum! He's more a 4 stroke guy than a 2 though. I love the 2 strokes . He ported out the heads on brother baja bug, it made a difference, but not like new heads would do. There is alot to be gained in 4 strokes, just not normaly as much as the 2 strokes benefit. I love making old 1970s and 1980 2 strokes go, porting was so new and foreign to most people at the time.

I got a 1985 suzuki fa50 moped on my list to port soon
Stock speed is 30mph. If i can reach 40, I will be happy. I will also make a custom pipe, it's a 2 stroke with a straight pipe lol

[RubberSalt]

Here is a porting video from Ken O Conner, he's good at what he does, but this is just an idea of how to port a cylinder, he is working on a blaster.
http://www.youtube.com/watch?v=ZCVU18g_3xQ

[RubberSalt]

When I'm done with this next cylinder of mine, with the big reeds. I'm going to post vids of it, then if you guys want to buy it...

[RubberSalt]

Just a call out to everyone. Who's got triple port exhaust? Who did the work?

[RubberSalt]

I'm going to be posting a video of of drilling triple ports later tonight.

[ironchop]

I have to say,looks as if you definitely did yer homework before throwing dremel tools at that cylinder

Nice work and thanks for the thread

[bcredneck]

have you tryed copying the it 175 ports there more than twice the size but other than the ports the jug and pistion are bolt on even the rod is the same

[younganreckless]

I actsully hurt my new in 95, I was so bored at home I ported and polished a 200x motor without any info, I was so lucky!

[RubberSalt]

Heres the vid of the triples being drilled. Kind of a little how too thanks to my brother. http://www.youtube.com/watch?v=x0kRsYzg5g8

I just got an argon bottle, so now ill be able to weld up the side walls and make them MASSIVE same with the boyesen (for another video)

[RubberSalt]

@bredneck I haven't had an IT cylinder to copy, all the pictures of the ports are either hard to see or to dark. No good pics. This cylinder i started working on in the video... I'm going all out on it, the last 1, I didn't do all that i could. It had the stock reed cage, this 1 is going to have the blaster reed cage.