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Old July 20th, 2012, 06:36 AM   #1
Pretzel
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Bike won't rev

Alright guys, my '07 is finally running, but when i go to rev it, it gets to about 2k and boggs out and dies. I had to adjust the needles because it was getting too much gas and wouldn't rev at all, but now I can gas it slightly before it dies. Taken the carbs apart n cleaned them MANY times, jets n all, replaced spark plugs, and just put a new regulator on it. HELP PLEASE!!!
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Old July 20th, 2012, 07:05 AM   #2
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Mix is lean.

Have the valves been adjusted recently?
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Old July 20th, 2012, 03:08 PM   #3
Pretzel
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No I haven't messed with them. What do I need to do with em?
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Old July 20th, 2012, 03:10 PM   #4
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The valves need to be adjusted every 6K miles.

Learn how to do it yourself:

http://faq.ninja250.org/wiki/How_do_..._the_valves%3F
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Old July 20th, 2012, 03:59 PM   #5
jcgss77
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^^^this. The valves are not hard to do, and definitely follow the ninja250 wiki. I only had to remove the coil on the right side of the bike because the cam chain took out too much room for me to work on the valves on that side. It says that opening up the valve clearances will increase noise, but in the case of the '04 bike I just got, it made a very noticeable DECREASE in noise. Also, most bike mechanics I have heard of will charge you a lot (read: too much) to adjust them.
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Old December 24th, 2012, 09:01 PM   #6
AlfredoGonzalez
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Gas engines need fuel (fuel/air), spark, and compression... If the spark and compression are fine, go to fuel/air. Look at things that may restrict gas flow. Since you've already taken care of the carbs I'd suggest looking at other parts of the fuel system. The petcock if rusted out can restrict gas flow or cut it off completely, a severely dirty fuel filter can also restrict gas flow. The gas itself if old can also cause problems.

If the petcock, fuel filter, gas lines, and the gas itself is fine, then i'd say it's on the lean mixture side. If not that, then dirty air filter restricting air flow.

The valves will also play a large part as if they're severely out of adjustment it will cause running problems.
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