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Old 06-04-2008, 08:18 PM   #1
greentegr6
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*** need help with my 900RR ***

whats up family, I need you guys advice/help. I just bought a cbr 900(93 model). well the bike has 29, miles on it and not sure if its ever been tuned.

the bike starts up everytime, my problem is that when i try to hit full throttle in 2nd gear or 1st. it bogs a lil and hesitate. like its kinda struggling to pull out the power.

I know that its really happens in 3k-4.5k rpm. I have not yet tried to get it any higher than that. with fear of damaging the motor.

the bikes oil seems fine even though i know i should be changing it. only mods the bike has is a d&d exhaust and i believe a k&n filter. not sure if the bike has any jet kits.

well my question is, does anyone know what could be causing the bike to bog and hesitate when trying to open full throttle. Or, does anyone know a respectable shop that can look at my bike without charging me a arm and leg. thanks guys
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Old 06-04-2008, 08:25 PM   #2
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sounds like it is one or 2 things main thing i would think it is would be that the carbs are out of sync (take it to a shop to get it done)

2nd thought would be that it is flooding itself out either the jets are too big or you need to roll on the throttle not just gun it


Motorcycles Unlimited is a good shop to take it too if you are on the northside

or Javi if you are on the Westside
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Old 06-04-2008, 08:28 PM   #3
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Pulling from that low in the rev range is going to get you some "bog" anyway, but it could be TPS, could be dirty injectors, lots of "could be's".

Metric Motorcycles in the Heights- in house dyno tuning

Motorcycles Unlimited on the North side

Only two places to bring your bike for work IMHO.

Be aware though, you're going to pay for it. Maintaining a motorcycle is not cheap.
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Old 06-04-2008, 08:29 PM   #4
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if you dont have a jet ket it will make you run rich which in turn will foul out your plugs, trust me been there done that, not fun. i'd say your plugs are fowled (mine was doing the exact same thing till i changed plugs and jetted it) or your carb needs tuning. If its the plugs i feel sorry for you, its a major inconvience to change them, at least it is on my 98. you have to pull the gas tank, the air box ( both top and bottom) your HT coils, unplug your pulse generator, and move the heat sheild out of the way, better have a 6" ext., a 5/8 spark plug wrench and i have a 24" grabber for lost bolts, works great for lifting the spark plugs out vertical b/c my spark plug socket wont grab them, also helps restarting them as if you start to cross thread them this thing wont let you. first things id check are to see if you have a jet ket, if not fix it pronto, check for fowled plugs, and last but def not least check your carbs for proper mix/synch.
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Old 06-04-2008, 08:30 PM   #5
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*edit

If it's carbureted, it could be vacuum leaks, or it could be a dirty fuel petcock, there's lots of "could be's" with that too.
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Old 06-04-2008, 09:29 PM   #6
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Those bikes won't hesitate if jetted correctly, so:\

1. you have dirty carbs if you have the stock pipe still on it.

2. you have dirty carbs and/or it is not jetted correctly.

This is assuming that the batt. does not need recharging every couple days, in which case it is something different.
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Old 06-04-2008, 09:35 PM   #7
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clean the carbs.

search Youtube for carb cleaning if your not sure how to do it...
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Old 06-04-2008, 09:37 PM   #8
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Quote:
Originally Posted by tomLSTD View Post
Pulling from that low in the rev range is going to get you some "bog" anyway, but it could be TPS, could be dirty injectors, lots of "could be's".

Metric Motorcycles in the Heights- in house dyno tuning

Motorcycles Unlimited on the North side

Only two places to bring your bike for work IMHO.

Be aware though, you're going to pay for it. Maintaining a motorcycle is not cheap.
I took my ZX9R to Motorcycles Unlimited for carb work in 06 synched and running great.
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Old 06-04-2008, 09:40 PM   #9
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im betting its a combination of carbs dirty or u said it has exhaust and possible filter if so this engine is now moving some air and needs to be rejeted and probably some sort of vacumm leak i know my bandit with stock jetting and stock everything ran perfect until i got the pipe and pods. it really opened up the engine and now i jumped way up on the main jet and lifted my needles. or it could just take the bike awhile to warm up.
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Old 06-04-2008, 10:05 PM   #10
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yea the battery is fine. I took my gsxr to Motorcycles Unlimited once before. I might just have to take it back to those guys again.

this is my first carb bike so not to sure on how to adjust the carbs or sync/mix them. that may be a job for m/u.

I tried to roll on the throttle as well and same results. as far as plugs. i can change those. I removed the tank last night. just didnt have the tools.

thanks for the quick response.

I hope patrick doesnt mind me asking but how much will you charge just to check it out and see whats wrong. you can pm me if you like.thanks big time
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