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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 09-29-2019, 07:30 PM   #1
Gorilla
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Bad Gas?? Huh?

Hey team- I recently sent my carbs out for a full rebuild and jet kit. The guy had done the carbs on my previous gen1 and I'm pretty confident in his work.

Well, I got the carbs back on, and the bike pretty much fired right up. Idles great, no weird issues yet...

Then, I went for a quick ride to get some more gas (there had been about 3/4 of a gallon sitting in the tank for about 2.5 months while the bike was waiting for the carbs)

As I left my neighborhood, I was just gently adding throttle and the rpms climbed as expected. Everything felt fine.

Next, I was waiting at a light, it turned green and I pulled away. Then, as I shifted into second, and gave it just a little more throttle, the bike just completly bogged down and fell on its face.

I immediately downshifted and tried to get the rpms back up, which it did, but I basically felt like I was limping it to the gas station. I bought 2 gallons of fresh gas, and then kinda limped it home.

So weird. It idles fine, and gently accelerates fine, but won't take any real throttle. Runs ok in first gear as long as I don't put the motor under any real load.

Please help! Any ideas? Thanks in advance!!!
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Old 09-29-2019, 07:38 PM   #2
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It’s not the gas.
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Old 09-29-2019, 08:00 PM   #3
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Quote:
Originally Posted by Desmo View Post
It’s not the gas.
Any thoughts of what to check first?? Second??
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Old 09-29-2019, 10:14 PM   #4
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Throttle Throat Vent Hose

Where does this hose go? Back to a carbon canister? I wasn't able to reconnect it when I reinstalled the carbs and so I thought maybe it was just for venting as the description says...

Now I'm starting to think it may be more important and needs to be reconnected.
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Old 09-30-2019, 03:07 AM   #5
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Had to look through the pictures on Pats site to figure out what in the world that is a picture of. "Disconnect Throttle Throat Vent Hose (This may be on California Models Only) "

My bike definitely does not have those hoses
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Old 09-30-2019, 04:23 AM   #6
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Originally Posted by Gorilla View Post
Any thoughts of what to check first?? Second??
A rag or other obstruction under the seat blocking the air filter.

Clogged fuel filter.

Fuel petcock under tank in closed position.

Those damned o-rings leaking fuel
http://www.cartestsoftware.com/fz1/j...ml#AddendumIII

Bad battery.

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Old 09-30-2019, 06:39 AM   #7
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Kinked fuel line?
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Old 09-30-2019, 09:46 AM   #8
Gorilla
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Quote:
Originally Posted by Pat Glenn View Post
A rag or other obstruction under the seat blocking the air filter.

Clogged fuel filter.

Fuel petcock under tank in closed position.

Those damned o-rings leaking fuel
http://www.cartestsoftware.com/fz1/j...ml#AddendumIII

Bad battery.

Pat
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...
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Old 09-30-2019, 09:58 AM   #9
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Attention Friends in Colorado

I don’t know how to post anymore, I’ve been gone for so long
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Old 09-30-2019, 10:02 AM   #10
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Friends in Colorado

Sorry. Double mistake post
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Old 09-30-2019, 10:59 AM   #11
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Jake get a grip.

2nd the rag under the seat. Check that first.
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Old 09-30-2019, 11:26 AM   #12
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I would check for vacuum leaks.
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Old 09-30-2019, 01:49 PM   #13
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Quote:
Originally Posted by Desmo View Post
It’s not the gas.
You're right. There's no way it's the gas. I just went out to the garage to try and find the issue.

I put the tank back on, turned on the gas, and she fired right up. Takes throttle in neutral like she always did. Even riding in first and second gear no problem.

Then once I get past a certain point of throttle input, she just falls on her face. Instant and total loss of power until I ease out of the throttle. Bizarre.
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Old 09-30-2019, 02:12 PM   #14
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I had this exact same problem on my 01 ages ago. Well, at least the symptoms you describe matched it.

One day I'm riding across the San Mateo bridge and the thing won't accelerate. Problem came out of the blue. I rode the bike every day.

I recall though that when I got it home it I found that it was leaking fuel from one of the float bowls. I called a buddy and asked what to do. Think I started a thread here too.

I never figured the problem out. I got frustrated and parked it. A few days later it started up and the problem was gone, never appeared again.
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Old 09-30-2019, 02:14 PM   #15
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Quote:
Originally Posted by Gorilla View Post
You're right. There's no way it's the gas. I just went out to the garage to try and find the issue.

I put the tank back on, turned on the gas, and she fired right up. Takes throttle in neutral like she always did. Even riding in first and second gear no problem.

Then once I get past a certain point of throttle input, she just falls on her face. Instant and total loss of power until I ease out of the throttle. Bizarre.
Have you checked to make sure nothing is blocking the air intake tract or air filter? That is a classic symptom of a partially blocked air intake.
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Old 09-30-2019, 03:52 PM   #16
Gorilla
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Have you checked to make sure nothing is blocking the air intake tract or air filter? That is a classic symptom of a partially blocked air intake.
Thanks for your comment, and yep, I opened it all up and double-checked. Nothing in there but an air filter
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Old 09-30-2019, 03:54 PM   #17
Gorilla
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Quote:
Originally Posted by Desmo View Post
I had this exact same problem on my 01 ages ago. Well, at least the symptoms you describe matched it.

One day I'm riding across the San Mateo bridge and the thing won't accelerate. Problem came out of the blue. I rode the bike every day.

I recall though that when I got it home it I found that it was leaking fuel from one of the float bowls. I called a buddy and asked what to do. Think I started a thread here too.

I never figured the problem out. I got frustrated and parked it. A few days later it started up and the problem was gone, never appeared again.
Do you know if the rubber hoses coming from carbs 2 & 3 are necessary? The ones that lead from the carbs and presumably back to the carbon canister? When I put the carbs back on I wasn't able to reconnect them (where they come to a T)
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Old 09-30-2019, 04:18 PM   #18
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No idea. Sold the thing in 2005.

Pat would likely know. He had a CA model.
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Old 09-30-2019, 10:43 PM   #19
longeze
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Quote:
Originally Posted by Pat Glenn View Post
...Clogged fuel filter.
Fuel petcock under tank in closed position...
Bad battery.
Quote:
Originally Posted by Harry1976 View Post
Kinked fuel line?
Check/verify these ^^^^, then check for correct fuel pump flow and alternator output before verifying correct float levels. It's possible the carb rebuilder set the float levels identically - but incorrectly, so once you increase the engine load, it starves for fuel & dies. Also, check that the needles are secured in your slides & in their correct positions.

One way or another it comes down to inadequate fuel flow or your ignition is breaking down under load. Doubtful it's a vacuum leak from hoses since you didn't report any fast idle issues but make certain your boots are secure all the same. Other possible suspects include sticking needles in their seats from installation error, partial blockages from contamination & incorrect slide diaphram installation causing your slides not to raise when the throttle is opened. If you get that far, check your diaphrams for perforation. Good luck!
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Old 09-30-2019, 11:36 PM   #20
Desmo
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I hate to say it. But the last thing that was futzed with was the carbs right??

Soo maybe...
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