Rollerstarter Posted November 2, 2007 Report Share Posted November 2, 2007 im need help to port my exaust cylinder(trail port)tool and tip to make a good home made port for free money to get hp.my banshee on dynojet 47,6hp and 35,4lbs of torque and guy to dyno recomend me to port my exaust to get more horse power with my settup.(t5,v-force2,knn on airbox,knn extreme power lid,boost bootle,coolhead prodesign 20cc dome,piston wiseco prolite 66,50over,intake sligly ported transfer sligly ported,and crankase and gasket matching to cylindrer ,im run o pump gaz. Quote Link to comment Share on other sites More sharing options...
2004LEBanshee Posted November 2, 2007 Report Share Posted November 2, 2007 I would not try to do it your self you can get a trail port kinda cheep from good builders I would go that route. Quote Link to comment Share on other sites More sharing options...
dekker Posted November 2, 2007 Report Share Posted November 2, 2007 Send the cylinders out let a professional do it! Quote Link to comment Share on other sites More sharing options...
theshee Posted November 3, 2007 Report Share Posted November 3, 2007 word. Quote Link to comment Share on other sites More sharing options...
bgbeards Posted November 3, 2007 Report Share Posted November 3, 2007 Send them to Kevin Herr. I just got mine back and he did an excellent job. Good prices and excellent to deal with. http://www.herrjugsracing.com/index.htm Quote Link to comment Share on other sites More sharing options...
4stroker Posted November 5, 2007 Report Share Posted November 5, 2007 dont send em out man have a go your self and learn something buy a few books and read everything you can on the internet and start cutting! take the port out wider and oval shape the roof of it with the centre of the port about 2mm higher than it is now. the shape of the port is important to get your rings to last but unless you go berko on it you should be right make sure you end up with a nice little chamfer on the port so it dont catch on the rings and polish the whole exhaust outlet in my opinion if you take your time and be smart about it you shouldnt go too wrong but even if you do stuff up who cares whats a stock set of cyls worth these days $200?? Quote Link to comment Share on other sites More sharing options...
theshee Posted November 5, 2007 Report Share Posted November 5, 2007 dont send em out man have a go your self and learn something buy a few books and read everything you can on the internet and start cutting! take the port out wider and oval shape the roof of it with the centre of the port about 2mm higher than it is now. the shape of the port is important to get your rings to last but unless you go berko on it you should be right make sure you end up with a nice little chamfer on the port so it dont catch on the rings and polish the whole exhaust outlet in my opinion if you take your time and be smart about it you shouldnt go too wrong but even if you do stuff up who cares whats a stock set of cyls worth these days $200?? I wouldnt do that... there is always that "what if" you fuck something up.... then you are out a lot more then $200. Not only that, you can be leaving a ton of performance behind. Just send them off and have someone that knows what they are doing port them. Quote Link to comment Share on other sites More sharing options...
nunyabinness Posted November 5, 2007 Report Share Posted November 5, 2007 truthfully, i would say just leave them alone. if your cylinders are at 66.50 mm bore then they are on their last oversize. so they aren't worth spending the money on porting them. i would suggest getting a set of stock bore cylinders and paying to get them ported. Quote Link to comment Share on other sites More sharing options...
jbooker82 Posted November 5, 2007 Report Share Posted November 5, 2007 Yea if you want to try to mess around with the cylinders. You have a good set because they are on there last leg any way. Quote Link to comment Share on other sites More sharing options...
4stroker Posted November 5, 2007 Report Share Posted November 5, 2007 truthfully, i would say just leave them alone. if your cylinders are at 66.50 mm bore then they are on their last oversize. so they aren't worth spending the money on porting them. i would suggest getting a set of stock bore cylinders and paying to get them ported. even more reason to port em yourself! Quote Link to comment Share on other sites More sharing options...
dajogejr Posted November 6, 2007 Report Share Posted November 6, 2007 I agree...they're at the end of their life, and for the price of used good stock cylinders, it would cost even more to sleeve the ones you have. Read up on it...port it...and if you F it up, buy stockers and have someone do them for you... Quote Link to comment Share on other sites More sharing options...
kawiking Posted November 8, 2007 Report Share Posted November 8, 2007 my cyln are .40 over, how many more bores do i have left on them ?? sorry for stealing your thread. had mine drag ported this year. Quote Link to comment Share on other sites More sharing options...
blowit Posted November 8, 2007 Report Share Posted November 8, 2007 my cyln are .40 over, how many more bores do i have left on them ?? sorry for stealing your thread. had mine drag ported this year. Well, .40 over and biggest piston before sleeve is .100, well I am sure you can subtract. The thing is not to bore unless there is a "proven" reason to do so. B Quote Link to comment Share on other sites More sharing options...
Duneman101 Posted November 8, 2007 Report Share Posted November 8, 2007 I think he ought to give it a shot... just cleaning up casting flaws and port match the cast to the sleeve it going to see some difference.... if no new people learn to port and leave it all to the big builders no one will be left when they retire. Quote Link to comment Share on other sites More sharing options...
Wildcardracing Posted November 13, 2007 Report Share Posted November 13, 2007 I say go for it! Call me crazy, pulled my one month old 06' down and started cutting (couldn't afford th $400 K&T quoted me) had excellent results. Made a port map using a pencil and paper, then transferred it on to some magnet material and drew the ports on there the way I wanted them. Raised my exhauts 3mm and matched the outlet to the pipes, raised the intake windows 2mm and shaved 1mm from each side of the intake bridge and knife edged it. then added boost (boysen) ports with a 5/16 drill and blended them in. Cleaned up all of the casting flaws, then bead blasted the intake sides and polished the exhaust to a mirror shine. Was very carefull to make each cylinder exactly the same. Wish I had taken pics of the process, but I was too excited to get it done and see how it ran! My bike is geared up (40-t rear) and I was pulling Choke Cherry at St. Anthony in 3rd, could almost get fourth. My brothers YFZ450 (piped, intake, geared way down) was lugging up it in second. I encourage more people to try porting for themselves..."Built not Bought" Quote Link to comment Share on other sites More sharing options...
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