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post #1 of 7 Old 09-10-2017, 4:28 PM Thread Starter
 
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Lack of power

Hello All,

So I got a pretty good deal on a 2000 Honda CBR929rr for 800 bucks. The motor and trans are really strong, but it is lacking a lot of power and feels like it is going to bog out on me in mid range RPM's. Even when trying to get the bike to crawl in first gear it requires me to just lay on the throttle. I don't think that the fuel pressure regulator is actually creating a vacuum so there is a new one on the way to be put in to see if that helps. I have noticed that the HTEV and Servo motor have been cut out completely from the bike. On top of it someone has completely removed the flapper in the air box as well. I was completely willing to put all that back in after finding the parts, but finding those parts are almost impossible considering the bike is 17 years old. The servo is completely gone and someone has hard wired those resistors and capacitors into the plug like it shows on this site and the CEL still comes on for a code 34.

Note: Spark plugs have been changed and are new and problem still exists.


So now, my questions are:

If the servo and HTEV have been completely gutted from the bike how much of my problem is being created by that or is it just needing tuning at this point?

Where else should I look for the root cause of the problem of it just bogging down?
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post #2 of 7 Old 09-12-2017, 2:00 AM Thread Starter
 
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Re: Lack of power

Update:

So I had to replace the wiring harness completely because it was an absolute rats nest. The fuel pressure regulator was replaced with a new one. Is anyone familiar with what that black canister is that sits below the fuel pump on the frame?
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post #3 of 7 Old 09-12-2017, 2:40 AM
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Re: Lack of power

Quote:
Originally Posted by MrKneeDropper View Post
Update:

So I had to replace the wiring harness completely because it was an absolute rats nest. The fuel pressure regulator was replaced with a new one. Is anyone familiar with what that black canister is that sits below the fuel pump on the frame?
That could be your EVAP system canister (California)
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post #4 of 7 Old 09-12-2017, 11:14 PM
 
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Re: Lack of power

And if it is the evap, it can be safely removed. Not legal, but I did it because it was such a pain in the ass to change oil in my RC51 with that goddamm thing there.

Were your old plugs wet when you pulled them?
FPR will probably solve your problem. Inspect that vac line from the fpr to the throttlebodies, a small leak in it will give you some trouble too.

Last edited by jondog9; 09-12-2017 at 11:20 PM.
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post #5 of 7 Old 09-15-2017, 2:59 AM Thread Starter
 
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Re: Lack of power

Was thinking the same thing as far as a vacuum leak within that? Do you know how they hook up or have a picture that shows me how it does? I at least want to plug the vacuum lines if I have to by pass it.
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post #6 of 7 Old 09-16-2017, 5:49 PM
 
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Re: Lack of power

I don't think you can bypass it. It's vacuum coming from the throttle bodies, I guess that works with the diaphragm inside the fpr.
On my bike, it's a single hose off the fpr that tee's into the two throttlebodies. That's why the bike runs like it's flooding when the fpr is bad. Excess and unmetered fuel entering along with the injected fuel.
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post #7 of 7 Old 09-03-2018, 2:55 PM Thread Starter
 
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Re: Lack of power

Found the solution. Sorry for the late reply, but it was the little butterfly piece missing in the exhaust. Without it causes way to much back pressure. Put a new one on from Fleabay and had no issues with the bike. Sadly it has been sold since then.
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