clutchburningracing Posted January 9, 2008 Share Posted January 9, 2008 Anyone experiance this? Have been trying to figure this thing out for awhile now with no luck. 03 Bird runs fine up to 7000 rpm then starts to break up, kinda sounds like it is hitting the rev limiter. Quote Link to comment Share on other sites More sharing options...
rockmeupto125 Posted January 9, 2008 Share Posted January 9, 2008 First, take your spare key, open the tank cap, and take it out and run it (hopefully not with a full tank). If it revs right, then you've got a plugged tank vent. If it doesn't rev right, I'd continue by swapping out the plugs. Quote Link to comment Share on other sites More sharing options...
MrBadExxample Posted January 9, 2008 Share Posted January 9, 2008 Is the FI light on? Ensure the FI light is working. IIRC it should be illuminated when you first turn the bike on. I know it sounds like a stupid question. But hey, one of my secret powers is an uncanny ability to notice the obvious. Quote Link to comment Share on other sites More sharing options...
runner Posted January 9, 2008 Share Posted January 9, 2008 Are all air/air filter passages open and clean? A blocked air filter could cause similar problems...Are you running a stock or K&N fliter? Quote Link to comment Share on other sites More sharing options...
spicholy Posted January 9, 2008 Share Posted January 9, 2008 Partially clogged fuel filter? May give enough pressure at low revs then not have enough flow at high revs. Quote Link to comment Share on other sites More sharing options...
clutchburningracing Posted January 9, 2008 Author Share Posted January 9, 2008 Fiberglass tank- removed the cap=no change 2nd set of new plugs= same looped the FI for trouble codes=same not running an air filter aftermarket big fuel pump with pressure guage and regulater 50psi at idle does drop a little when reved quick 46 or 47psi replace the cam pulse pick up and gen=same tried with air filter=same checked timing on the cams and with a timing light=same changed ecu= same aaaaaaaaaaaaaaaaahhhhhhhhhhhhhh!!!!!!!!!!!!!!!!!!!! Quote Link to comment Share on other sites More sharing options...
airborneXX Posted January 10, 2008 Share Posted January 10, 2008 Fiberglass tank- removed the cap=no change 2nd set of new plugs= same looped the FI for trouble codes=same not running an air filter aftermarket big fuel pump with pressure guage and regulater 50psi at idle does drop a little when reved quick 46 or 47psi replace the cam pulse pick up and gen=same tried with air filter=same checked timing on the cams and with a timing light=same changed ecu= same aaaaaaaaaaaaaaaaahhhhhhhhhhhhhh!!!!!!!!!!!!!!!!!!!! Throttle cable too short? Looks like you covered alot of ground, That's all I could come up with Quote Link to comment Share on other sites More sharing options...
cbrxxquad Posted January 10, 2008 Share Posted January 10, 2008 Clean Injectors What did you do before it started doing this, you changed something? Quote Link to comment Share on other sites More sharing options...
MrBadExxample Posted January 10, 2008 Share Posted January 10, 2008 I'm speculating here, but I wonder if disconnecting the knock sensor would change anything. Quote Link to comment Share on other sites More sharing options...
rockmeupto125 Posted January 10, 2008 Share Posted January 10, 2008 I'm speculating here, but I wonder if disconnecting the knock sensor would change anything. No. Or highly unlikely. Fiberglass tank? Aftermarket pump? Lets flesh this story out. There's more here than a simple "breaking up at 7 grand." Quote Link to comment Share on other sites More sharing options...
cbrxxquad Posted January 10, 2008 Share Posted January 10, 2008 I'm speculating here, but I wonder if disconnecting the knock sensor would change anything. No. Or highly unlikely. Fiberglass tank? Aftermarket pump? Lets flesh this story out. There's more here than a simple "breaking up at 7 grand." I agree, has it ever worked right? Quote Link to comment Share on other sites More sharing options...
clutchburningracing Posted January 11, 2008 Author Share Posted January 11, 2008 put different injectors in it, ran rich but still the same pulled the turbo off running just motor. in the process of tuning the bike to set up the spray. motor still has the turbo 9:1 pistons, really i changed nothing just removed the turbo. the a/f fuel is fine right up to 7000 then goes all over the place. it kinda acts like it is hitting the rev limiter, just not as pronounced. i disconnected both power commanders and tried just the ecu-same. valves not closing at that rpm?? pistons in backwards????? cams out of time?? ecu not advancing timing??? i am almost to the point of pulling the motor out and starting over. :icon_wall: :icon_doh: Quote Link to comment Share on other sites More sharing options...
cbrxxquad Posted January 11, 2008 Share Posted January 11, 2008 Pull the valve cover and check that the cams are in right and valve lash is correct. Do a compression check. Would knock if the pistons are in backwards at idle, pin offset. Put a timing light on and make sure it is advancing. Should be spot on at idle, and move as you accel. would need a degreed mark for max adv. Check plug gap, to small won't accel. But starts nice. Change fuel and fuel filter. Check the exhaust temp with ir temp gun. Sound like fuel injectors pluged. Take out and spray backwards with air and carb cleaner, and keep off the orings. Will swell. If they doo let dry and oil to replace. Make sure that fuel flows out the fuel line fast enough and does not slow. With the fuel pressure good that does ot sould like it is the problem, but should keep droping. Put other injectors back in. Go back to what worked. If you are doing this you should keep a book and log each change. Only do one thing at a time. You need egt and afr readings to know. Just some things off the top of my head. Bet you have plugs wired wrong, check that the positive is going to the right side of the coil. Check plugs are firing, each one. check the resistance of the plug wires check the wire is pluged on to the plug,,,,some need the screw removed to connect Check the plugs are correct. Quote Link to comment Share on other sites More sharing options...
Northman Posted January 11, 2008 Share Posted January 11, 2008 Valve float Quote Link to comment Share on other sites More sharing options...
jon haney Posted January 11, 2008 Share Posted January 11, 2008 This does not sound like a fuel problem. Have you tried changing the coils? When a coil starts to go bad, it will not produce a hot enough spark for higher RPM. Also, check all wiring related to ignition. You may have a short somewhere. Good luck finding the problem. Quote Link to comment Share on other sites More sharing options...
clutchburningracing Posted January 12, 2008 Author Share Posted January 12, 2008 how would I check the coils on a meter? valves-would a bad spring be the problem? Quote Link to comment Share on other sites More sharing options...
Fast Eddy Posted January 12, 2008 Share Posted January 12, 2008 how would I check the coils on a meter? valves-would a bad spring be the problem? Or if your running a lot of boost you can hang a intake valve open. Quote Link to comment Share on other sites More sharing options...
JB4XX Posted January 12, 2008 Share Posted January 12, 2008 how would I check the coils on a meter? valves-would a bad spring be the problem? Or if your running a lot of boost you can hang a intake valve open. He cant be running boost if his turbo is in Indiana. Quote Link to comment Share on other sites More sharing options...
cbrxxquad Posted January 12, 2008 Share Posted January 12, 2008 how would I check the coils on a meter? valves-would a bad spring be the problem? ohm meter and resistance, book will tell correct number, i think 1.2 ohms off the top of my head Quote Link to comment Share on other sites More sharing options...
Fast Eddy Posted January 12, 2008 Share Posted January 12, 2008 how would I check the coils on a meter? valves-would a bad spring be the problem? Or if your running a lot of boost you can hang a intake valve open. He cant be running boost if his turbo is in Indiana. Josh did you buy that too? Quote Link to comment Share on other sites More sharing options...
tomek Posted January 12, 2008 Share Posted January 12, 2008 I think it is muffler bearing ,,,,,,,, Obviously lots of things has been modded on the bike ,trying to troubleshoot it over the Internet might not be easy,,,,,,,, I understand it run stock ecu with turbo,so I guess fuel pressure regulator has been changed to rising rate regulator.Stock is reference type.A/F might go just too rich in high rpms,anyway, what is fuel pressure in stock motor/fuel system.? 50 sounds kind of high,it suppose to drop with engine running under vacum conditions ( like high rpm/small throttle openings) I would start here,just to cover the most obvious areas. Quote Link to comment Share on other sites More sharing options...
jon haney Posted January 14, 2008 Share Posted January 14, 2008 how would I check the coils on a meter? valves-would a bad spring be the problem? ohm meter and resistance, book will tell correct number, i think 1.2 ohms off the top of my head Yah, What he said. Sorry I'm late. Quote Link to comment Share on other sites More sharing options...
rhubarbray Posted January 15, 2008 Share Posted January 15, 2008 Might be a long shot,......check your battery and charging system. I just had the exact same symptoms on my Yamaha SRX600. @low rpm the battery could keep up with the charging system but at higher rpm it couldn`t and the voltage would climb as the regulator couldn`t keep up. Blew two headlights and a turn signal before the lightbulb in MY head turned on. Replaced the battery and all was good. Quote Link to comment Share on other sites More sharing options...
clutchburningracing Posted January 22, 2008 Author Share Posted January 22, 2008 I just went out and got a years supply of connectors and solder!!! This whole time checking and replacing everything, running my self CRAZY over this gremlin. I almost pulled the motor to check the head. I FINALLY FOUND IT!!!!!!!!! :icon_clap: :icon_clap: A 1 1/2 inch strand of wire with a connecter on one end that was on the ground side of the fuel pump was loosing connection when the bike started to rev high. Two strands of copper were holding the connection. Makes sense why the air/fuel went crazy!! Man I feel like a DUMB AZZZZZZ!!!!!! Thanks to everyone that gave input on my gremlin hunting adventure. Quote Link to comment Share on other sites More sharing options...
airborneXX Posted January 22, 2008 Share Posted January 22, 2008 I just went out and got a years supply of connectors and solder!!! This whole time checking and replacing everything, running my self CRAZY over this gremlin. I almost pulled the motor to check the head. I FINALLY FOUND IT!!!!!!!!! :icon_clap: :icon_clap: A 1 1/2 inch strand of wire with a connecter on one end that was on the ground side of the fuel pump was loosing connection when the bike started to rev high. Two strands of copper were holding the connection. Makes sense why the air/fuel went crazy!! Man I feel like a DUMB AZZZZZZ!!!!!! Thanks to everyone that gave input on my gremlin hunting adventure. Yeah that was my nexxt guess :icon_shifty: Glad you found it! Quote Link to comment Share on other sites More sharing options...
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