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Old July 12th, 2021, 09:34 PM   #1
bigBug
ninjette.org member
 
Name: rossi
Location: Cali
Join Date: Apr 2021

Motorcycle(s): 2007 Ninja 250

Posts: 20
bogs at 6.5k rpm

I have been chasing this problem for a while now and so far I was able to go off of previous posts, but couldn't find a post that discusses this issue.

I have two things that created issues for me. Background:
  1. I fixed a little rust in the tank with por 15. The rust spot kept clogging my carburetor so it had to be done, but I didn't block any tubes and I think I may have blocked something inside the tank. After cleaning the tank it ran fine a month. After that started to have problems. At first it was water in the tank. I emptied the tank and dried it. Refilled with gas and it was fine. Then the battery had loose terminal. Replaced the battery. Then I started having bogging. issues.
  2. I had a loose battery terminal that may have cause electrical issues. Probably not.

Current problem:
My bike is I think starving fuel around 6.5k rpm, it stutters and seems like it will die. But when I throttle more or roll off the throttle it comes back.

Things I have tried:
I was reading a thread in the morning about ventilation in the tank and got to test the bike with the fuel cap open and it made no difference. Does that mean I have ruled out my gas tank problem?

Tested the charging system and voltage stay around 13.5-14.7v from 1k rpm to 8k rpm.

What has made a difference in the past is replacing the fuel filter. I replaced
the fuel filter and ran without bogging for two days then the bog came back.

Now I don't know what is causing the problem. It runs perfectly, idles good. Just dead around 6.5k rpm.
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