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Discussion Starter · #1 ·
I bought this bike this past summer with 2,700 miles on it after it had been sitting for some time. Took her on some hour long rides and used as my daily for a good 2-3 months and put 700 miles. Then, one day before I got on the turnpike I filled up at a Sunoco with 93 octane. Then, 30 minutes into my ride, all of a sudden she lost a significant amount of power. one minute I was cruising with traffic, the next I couldn't go faster than 40 mph while pinned in 5th. The motor sounded regular and there was nothing unusual. It was like this for the rest of my ride home which was another 45 minutes.

This didn't happen again immediately the next time I rode, but it happened off an on for a day or so. Now it is all the time.

Now, when I pull out from a stop in 1st gear, i give it throttle and it doesn't go anywhere but sounds like its about to stall. the more throttle I give it the worse it gets. I have to shake the throttle quickly, increasing then decreasing then increasing again in order to get it moving, but even then it has surges of power loss. Shifting to second sounds like it wants to stall, so I have to shake the throttle again.

I let it sit for a couple of weeks and used my car to get to work until i had some time to look into this. Next time i started it she stalled right away. took 3 tries to get her running, and then her idle was off. you can hear it sputtering and sounds like it will stall.

Heres what i checked:
- drained gas and ran seafoam through it with fresh gas
- all 4 spark plugs look good, I'm assuming the boots are fine as well.
- both pipes heat up quickly and you can feel that the exhaust is coming out from both of them evenly
- the air box is all good
- checked all fuses
- I can hear the fuel pump prime itself fine when I turn it on
- throttle positioning sensor works as it should
- while running some tests I turned it on and off a bunch of times, the battery died very fast so I charged it but it wouldn't hold a charge. I replaced the battery but that didn't change anything
- cleaned fuel pump filter with fresh gas and inspected the connection
- fuel cut off relay works as it should

Next I plant to check the spray pattern of the injectors and measure how much fuel it pumps out. I'm also aware that this bike never had its bank angle sensor replaced, which was recalled. But, since it has a mind of its own when i pull out at a stop sign or red light, i'd rather not ride it all the way to the dealership.

Any thoughts on what to inspect?

Thanks
 

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Discussion Starter · #2 ·
I believe I found the culprit. I decided to check the spark plugs again. I checked them when this first started and they were fine, now it has been a few months and they're black. My bike's been running very rich, but only since this started to happen. So, I replaced the plugs, pulled the air filter off and the bike ran great. The air filter looks ok though, it's not soaked or anything, and with around 3,500 miles on her, I'd be surprised if the filter is the only issue. With Vance and Hines pipes on her, there's no opening for an O2 sensor. I haven't found the eliminator yet if there is one. Next thing I'll do is check the mass air flow (iat) sensor.

Any other suggestions on why it may not be getting enough air at all speeds and throttle positions?
 

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Maybe check the throttle position sensor: TPI.

The O2 sensor is trying to overcome the very lean condition caused by the V&H pipes but this doesn't normally happen with a stock air cleaner.

Good luck.

Sam:nerd:
 

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Discussion Starter · #6 ·
You're right, bikebandit's oem parts dont show an o2. This leads me to believe that if the air filter is not the issue, then the intake air temperature (iat) sensor is likely giving the ecu incorrect air temperature and/or resistance. That would explain it running rich during the past hot summer months. I'll know on wednesday when my k&n air filter comes in.
 

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Discussion Starter · #8 ·
SOLVED
The issue was with the OEM Honda air filter. When this issue first started, one of the first things I did was check the plugs. Since the plugs looked great, I didn't think it was a fuel-air ratio problem. After I had kept riding it on and off for a few weeks, I checked the plugs again and they were black. Since it was getting too much fuel/not enough air, I pull the air filter off, replaced the cover, and rode it around. I'm not sure why the air filter failed, but the bike performed great without it. I replaced the air filter with a K&N and the bike runs fine now.
 

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If your oil breather tube is routed to the air cleaner, it doesn't take but a fine mist to clog up the pores and chock the machine. Thank the EPA if that's it. But thanks for the follow up.:thumbsup:
 

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Thanks for sharing the solution.
 
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