98bonerSTOCKshee Posted September 9, 2004 Report Posted September 9, 2004 Ok I am getting ready for a tear down. I am gonna finally put my prodesign head on. While I am in there I am gonna check my pistons and cylinders, as of right now I haven't had any problems with her. It's a 98 and has never been torn down (just amazing). I prob. get new pistons and might even get some hot rods. My question is about porting. I have no clue. However a buddy owns a Jetski shop Dale's. He does all my machine work and has always wanted me to get some porting. He knows 2 Strokes wether it be water or air cooled and he likes HP's. I just don't think he's ever port a Banshee. Is the porting tech. pretty much the same as with other 2 strokes? He says he's got a book with a bunch of numbers in it, that he read over and over years ago. He taught him self on the old 440 jetskis. I just dont wanna do multiple tear downs to get it right. Should I send it off to be port or what? Hell I am not even sure if I need her ported. After a fresh topend 'shee'll probaly be plenty for me. Quote
Leadfoot350 Posted September 10, 2004 Report Posted September 10, 2004 Id have him port it. Make sure he knows how much exhaust numbers he wants to use. I think its somewhere around 180-198. Also make sure he gives you a deal. Quote
roosthrower Posted September 10, 2004 Report Posted September 10, 2004 180 exhaust duration is about what a banshee has stock. when you start getting into the mid-higher 190's you can kiss your low end goodbye. I'd call anything over 195 degrees a drag port. I'd say let him port it, but don't let him go too crazy on the width of the exhaust port either. on an exhaust port that doesn't have a bridge, you aren't supposed to go any wider than 70% of the bore of the cylinder. anything wider than that and you will start snagging rings on the exhaust port. definitly let him get rid of the casting flaws. I'm sure he will do a good job though. Basic porting is universal. Quote
98bonerSTOCKshee Posted September 10, 2004 Author Report Posted September 10, 2004 cool. He's never really quoted me a price, but he's been reasonable on my other stuff. He's like $35 a hole for a bore. What ya'll pay for port-work? Hell while I am talking Dale.. He drills and taps temperature sensors in each of the exhuast pipes to tune the jetski motors. I believe this is a way for him to jet it and to adjust the pipes, I am not really sure. Have you ever tried setting up a 'shee by temperature of the exhaust? Just wondering sounds like a perfect way to jet to me. Quote
roosthrower Posted September 10, 2004 Report Posted September 10, 2004 jetting by exhaust gas temperatures is a good way to jet an engine. it's not as common as looking at the spark plugs though simply because it is more in depth than just taking off a set of plugs. I'll try to get back to you with some good exhaust gas temps for a gas motor. And I payed 200 plus tax for my port job. The cost of boreing a cylinder from the same guy is 50 a hole. I'm sure you can get some port work done for $200. Quote
98bonerSTOCKshee Posted September 10, 2004 Author Report Posted September 10, 2004 I have checked my temp at the exhuast flange before with one of the heat laser guns thingies. The temp for both pipes were with 2 degrees. That seemed close to me. The other way would be alot more accurate I think! Quote
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