Is cleaning up the ports worth the time?

[themechanic]

considering doing a clean up/rebuild bike cyls are bone stock. leaning more towards a cub kit just might do a refresh to save some coin

[AKheathen]

yes, it's always good to clean up casting flaws, but do some research first, and make sure not to hash up the port timings and don't remove the transfer knife-hook

[BigRed350x]

Yes, just take your time and do a good clean job. Don't get into your cylinder walls or raise/lower any of your ports. Just smooth everything out and remove the casting flash.

 

- Jared

[My03banshee]

Not sure about 2 strokes but with car engines MANY sources say it's better not to smooth out the intake ports so the roughness helps the incoming air mix with the fuel via turbulence or whatever. Obviously if you're porting it then that's out of the question but many still don't polish the intake after porting for this reason, I don't see why a 2 stroke wouldn't be the same, would you notice a difference? Probably not but just throwing it out there. But with the exhaust ports then obviously make it smooth as possible

[spurdy]

Not sure about 2 strokes but with car engines MANY sources say it's better not to smooth out the intake ports so the roughness helps the incoming air mix with the fuel via turbulence or whatever. Obviously if you're porting it then that's out of the question but many still don't polish the intake after porting for this reason, I don't see why a 2 stroke wouldn't be the same, would you notice a difference? Probably not but just throwing it out there. But with the exhaust ports then obviously make it smooth as possible

 

 

You can still clean up the intake. Almost all builders will etch the intake in one way or another to enhance atomization of the fuel as you describe. The exhuast will get polished but not the intake. 2 strokes are no different.

 

SP

[Coupelx]

You can still clean up the intake. Almost all builders will etch the intake in one way or another to enhance atomization of the fuel as you describe. The exhuast will get polished but not the intake. 2 strokes are no different.

 

SP

 

its not so much to atomize the fuel its to prevent puddling and keep the atomized fuel in suspension. but definately get the exhaust smooth to stop carbon buildup.

[BigRed350x]

Not sure about 2 strokes but with car engines MANY sources say it's better not to smooth out the intake ports so the roughness helps the incoming air mix with the fuel via turbulence or whatever. Obviously if you're porting it then that's out of the question but many still don't polish the intake after porting for this reason, I don't see why a 2 stroke wouldn't be the same, would you notice a difference? Probably not but just throwing it out there. But with the exhaust ports then obviously make it smooth as possible

 

Yeah, don't polish the intake. Just clean them up with the normal carbide burs that most people use for this sorta thing. They will leave a roughed up surface. You don't want to sand things down or polish the intake side. Do that on the exhaust. Exhaust port polished up is good thing.

[BLOODRAGE]

i think ive seen too many polished intake ports.this info would of been useful too me a few weeks ago lol

[Jereme6655]

Not sure about 2 strokes but with car engines MANY sources say it's better not to smooth out the intake ports so the roughness helps the incoming air mix with the fuel via turbulence or whatever. Obviously if you're porting it then that's out of the question but many still don't polish the intake after porting for this reason, I don't see why a 2 stroke wouldn't be the same, would you notice a difference? Probably not but just throwing it out there. But with the exhaust ports then obviously make it smooth as possible

 

Your right.....apparently alot of people know that.....what some are saying as "clean it up or smooth it out" isn't refering to polishing the intakes or anything.....it is them refering to grinding out the casting flaws and also making the transitions slightly more aerodynamic. As to actually getting in there and actually smoothing the surface most know not to do......but good catch on the wrong play of words...