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Re: Can't get the revs below 3500rpm
Remove the negative battery connection and leave it disconnected for about 15 minutes. That should reset your engine management system. I would try a different battery if you have one handy, or maybe put yours on a battery charger. For the problem to appear suddenly after six weeks without running the bike my best guess is the battery is not functioning properly.
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I have just worked on a 2003 ttr90 for a friend and had a similar problem. when I got the bike it had set up for a few years so the fuel system was wrecked. after a thorough cleaning the bike would run fine up to about 3500rpm. then it would cut out much like a rev limiter. it was very consistant and I read some forums but none said anything about a rev limiter. I had also installed a carb kit. I decided to remove the carb and try again. I figured it was lacking fuel in the upper rpms so I raised the throttle cylinder needle as high as it would go. there are 3 notches to set it. the factory setting was in the middle. after I raised the needle it ran like new and turned through the rpm range perfectly. hope this helps someone.
your battery is dead you can recharge it with a 12 volt battery charger. you could also jump the bike with another bike or a car. if these two solutions aren't possible because you don't have the necessary equipment or whatever you can bump start the bike by pushing it (works best down hill and/or with buddy's help) hoping on with the key in the on position and shifting into 2nd gear and dropping the clutch. be careful and goodluck
check battery leads (both ends) , Then make sure battery is charged 100% (verry important) Get out your (Digital) volt meter set it to DC volts Connect leads to the Battery, it should have at least 12.6 v , Watch meter and start engine, if meter drops below 10.0 volts your battery may be weak and will have to be replaced, or your starter is'nt mechanicaly efficient and will have to be fixed or replaced. While engine is running note voltage should be 12.6-13v volts, then rev engine to 3000 RPM , meter should read 13.5- 15 vdc. If not you have a problem with your stator or regulator/rectifier.