CB 919 Issues - Wrist Twisters
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post #1 of 8 Old 08-17-2015, 11:30 PM Thread Starter
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Question CB 919 Issues

Hello Twisters!

I am looking at purchasing a 2002 CB 919. The owner states that the only issue with the bike is that after it warms up it leaks fuel from what appears to be the air box. Does anyone know if this is an easy fix? What causes the issue and how much will it cost me to fix. Your input is greatly appreciated.

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post #2 of 8 Old 08-18-2015, 01:17 AM
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Never heard of it before.

If it genuinely is fuel, that's a biggie...and I'd look for another example of a 919, rather than take on an issue like that.

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post #3 of 8 Old 08-18-2015, 01:29 AM
(Quintus) Pilus Prior
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That's a bit tough. "out of the air box" could be a leak that starts at the tank or an injector that's leaking. I don't think it at all common. If you can, look at the area near the fuel pump and see if it starts from there.

Given that it happens when it warms up, could mean that it takes that long to get from the start to where you see it.

I'd suggest the odds are that it's an 'O' ring or some kind of seal that shouldn't be expensive to fix.

Chasing it down can be hard, because it could be a spray from some point you can't see.

I'm pretty sure you can lift the tank a bit and have the bike run, that's probably the best solution. Make sure you have something handy in case you start a fire.

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post #4 of 8 Old 08-18-2015, 06:29 AM
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Hopefully you are getting this bike cheap. If they want $4000 for it with a known problem like this, then pass. There are plenty of pristine examples out there that you don't have to buy a pig.

I bought my 919 from a friend for $1200. Ran great, but it had been laid down more times than Pamela Anderson. I put a bit over $1000 into it and now it is very nice. Thanks in no small part to all the guys here on WT that sold, and gave, me parts!!

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post #5 of 8 Old 08-18-2015, 06:44 AM
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most likely one of two things:
1. if it is fuel, FPS (fuel pressure regulator) is bad, pretty common issue
2. If it's oil, engine is overfilled with oil

look at the clear plastic collector hose at the airbox, oil or fuel.......

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post #6 of 8 Old 08-18-2015, 08:16 AM
just send it.
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My guess is the Fuel Pressure Regulator... those not very mechanical think that whole plastic assembly above the motor is the air box.

Look at the chain. It's a good indicator on how the bike as a whole was maintained. If it's grimy, rusty and out of adjustment, then the PO probably rode it hard, put it away wet, and never maintained it.

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post #7 of 8 Old 08-18-2015, 12:04 PM
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I agree that if it is fuel then most likely is the FPR but the bike would also run horribly. This isn't costly and is something you can fix yourself. I just looked on Partzilla the FPR is around $60.
Another possibility is that the fuel tank vent line is missing or disconnected. And maybe the filler cap seal is cracked or damaged causing a leak - down where the vent line is supposed to be. This situation could be dangerous IMO.
I wouldn't buy the bike w/o knowing exactly what the issue is.

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post #8 of 8 Old 08-19-2015, 09:09 PM
(Quintus) Pilus Prior
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I'd use the fuel leak as a negotiating point on the price. I wouldn't ride the bike till I got it figured out, either... Most likely its a disconnected hose under the tank. Even if that's not it, it should be fairly easy to find where its coming from. If the bike is otherwise OK, and you can get a price you can live with, I wouldn't let this kill the deal. Ymmv, of course. ?

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