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Go Back   FZ1OA Message Board > FZ1 & Fazer Owners Association > Exhausts, Carburetion & Performance > Gen 1 Exhausts, Carburetion & Performance

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Old 10-01-2019, 04:45 AM   #21
arkie6
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What about the large vent hoses for the carb top diaphragms (see the two large black unlabeled hoses running front to back in the diagram below over the top of the airbox and fitting in notches in the airbox with the ends going under the frame rail)? Are the ends of those properly tucked between the air box and frame rail and pointing down with the ends open (not mashed closed or otherwise blocked)? Those have to vent air to allow the throttle slides to lift.

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Old 10-01-2019, 12:51 PM   #22
Pat Glenn
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Quote:
Originally Posted by Gorilla View Post
Hey Pat, thanks for chiming in here. I have a CA model and it has that tubing that comes from the #2 and #3 carbs, down into a T, and then routes around the right side of the the motor, assumably down to the carbon canister. (I included a photo, from your site, in a post above)

Do I have to reconnect that? Can I block it off? Or run it open?

I was not able to reconnect it, and so maybe that's the source of my problem...
Shouldn't be an issue. In CA they don't want evaporating gas from sitting carbs to go to the air. So they route that evaporation to a carbon canister. Has nothing to do with engine operation.

Pat
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Old 10-02-2019, 06:38 AM   #23
iluvmyfz1
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Quote:
Originally Posted by arkie6 View Post
What about the large vent hoses for the carb top diaphragms (see the two large black unlabeled hoses running front to back in the diagram below over the top of the airbox and fitting in notches in the airbox with the ends going under the frame rail)? Are the ends of those properly tucked between the air box and frame rail and pointing down with the ends open (not mashed closed or otherwise blocked)? Those have to vent air to allow the throttle slides to lift.

Arkie, good description, and what I was incorrectly alluding to with my vacuum comment. From the ride report, it sounds as if the butterflies are opening but one or more of the slides/needles aren't being pulled up by the diaphragm. Vacuum leaks, damaged diaphragms, and as you describe with blocked vents, all can work to prevent operation of these CV carbs.

Had that issue on an old CX500, and my R6.

It ain't a Holley! (Thank goodness. Love these carbs.)
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Old 10-05-2019, 11:03 PM   #24
Gorilla
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Hey Team- thanks for all the responses and ideas. Honestly, I think at this point I'm going to take it to a trusted mechanic (also a very good friend of mine) and let him figure out this mess.

I will definitely report back with what was wrong and what solution we came up with.
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Old 10-07-2019, 11:22 AM   #25
fzwhat
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Some (possibly) useful info:

I had a similar problem with my '01 several years ago. It went gutless at around 3200 RPM when the engine was under any real load. I could 'nurse' it through the feeble area, and as long as I kept the RPMs up and/or the load light, it didn't happen.

What it turned out to be:

A combination of dirt on/in my spark plug boots/wires and humidity. The key thing that I noticed was that it seemed to happen more/worse when it was raining. I completely fixed it (as in, never happened again) by cleaning and re-terminating my plug boots (no new parts required).

Why (I think):

The pre-detonation spark voltage is (mostly) a function of cylinder pressure. Higher pressures require higher voltages. High load on the engine corresponds to high cylinder pressure. High spark voltage is also more likely to find a sneaky path to ground (through damp dirt, for example). Once that unintended discharge starts, the spark plug never gets to do it's thing. In the FZ1, an 'insulation failure' on a single plug wire takes down 2 cylinders. A poor connection between the wire and the boot will require higher coil voltages - more likely to 'sneak.'

Jim
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