crazykid
New member
OK porting guru's i need help again.Im really getting bummed out on the ported cylinders i bought. Question, do ported cylinders usually run a little higher peak rpm? took srx for a ride and really dont seem to pull any better than stock,worse actually.Stock cylinders pulled 8400 rpm, with same clutching ported cylinders only pull 8000 rpm.WHY? did i get screwed on these cylinders? before anyone says aske the engine porter,i cant get a hold of him,he changed his email,and i accidentally erased his messages that had his PH#. Hoping you guys that know porting can help me do something,really feeling sick to my stomach here, $$$$$$ spent on crap porting imstarting to think. But then again i tend to freak out when stuff dont work out right away. PLEASE HELP ME!!!!!!
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you will not need to pull more RPM's on a trail port. The exhaust ports are really not raised that far. More wider then anything.
A K MtnViper
New member
There are a lot of people that know more than me. But the main jet, needle setting or clutching should not have changed that much. I would not ride till some one smarter than me answers. I think there is a problem with the re-assembly of the engine.
montynormand
Member
as tomseal says, unless the exhaust port is raised, there will be rpm change. If you are really questioning the port job, map the cylinders, measure everything and ask another builder to review the map. Maybe one of the builders here could look at you cylinder map and give you suggestions. If you have never done any cylinder mapping, is very simple: here is a link to a great website that has several articles on how to do this
http://www.macdizzy.com/2stroke.htm
http://www.macdizzy.com/2stroke.htm
depend what kind of porting he made ...need more info but it shoudn't drop on rpm
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YAMMIEGOD3:16
Active member
SURE THINGS ARE NOT COMING OUT FOR YA AT THE WRONG TIME. POSSIBLEY POWER VALVES STICKING OR PRIMARY, SECONDARY SPRINGS NEED TO BE CHANGED. ALSO CHECK JETTING. I DID SAME THING TO MY 2000 SRX, I ADDED PORTED CYL,s , sled runs great. 3:16 (yammie tony)
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Triple X
New member
A ported 98 SRX7 should run 8400-8500, I agree with Yammiegod, I would look at power valves, springs. Who put it back together, are the valves adjusted?