themechanic Posted December 13, 2011 Report Share Posted December 13, 2011 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 Quote Link to comment Share on other sites More sharing options...
AKheathen Posted December 15, 2011 Report Share Posted December 15, 2011 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 Quote Link to comment Share on other sites More sharing options...
BigRed350x Posted December 16, 2011 Report Share Posted December 16, 2011 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 Quote Link to comment Share on other sites More sharing options...
My03banshee Posted December 18, 2011 Report Share Posted December 18, 2011 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 Quote Link to comment Share on other sites More sharing options...
spurdy Posted December 18, 2011 Report Share Posted December 18, 2011 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 Quote Link to comment Share on other sites More sharing options...
Coupelx Posted December 18, 2011 Report Share Posted December 18, 2011 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. Quote Link to comment Share on other sites More sharing options...
BigRed350x Posted December 18, 2011 Report Share Posted December 18, 2011 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. Quote Link to comment Share on other sites More sharing options...
BLOODRAGE Posted December 19, 2011 Report Share Posted December 19, 2011 i think ive seen too many polished intake ports.this info would of been useful too me a few weeks ago lol Quote Link to comment Share on other sites More sharing options...
Jereme6655 Posted December 19, 2011 Report Share Posted December 19, 2011 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... Quote Link to comment Share on other sites More sharing options...
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