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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 02-17-2018, 06:35 PM   #1
68mustang405
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Bog below 2500

I searched forum and couldn't find anything definitive. If I full throttle it from idle it seems to bog until about 2500 then takes off. Is this normal for this bike?

05 FZ-1 Skunk
-2 Bros Exhuast
-stock air filter and box
- carbs with Dynojet needles set to 2 clip position for 1 and 4 and 1 clip position for 2 and 3 per another thread on here.
- 14mm floats
-jets 130 for 1 and 4, 127.5 2 and 3
-idle screws 2.5 turns out.
- cleaned and synced carbs, new plugs, adjusted tps to manual specs but not Ivan's.
- Stock gearing
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Old 02-17-2018, 08:16 PM   #2
ralphcor
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Not normal. My uneducated guess would be jets/jetting.

Who did/when was the clean and sync?
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Old 02-17-2018, 10:07 PM   #3
iluvmyfz1
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Carb diaphrams have holes/leaks maybe?

How does it accelerate while in gear and rolling?
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Old 02-18-2018, 03:25 AM   #4
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Float height set correctly?
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Old 02-18-2018, 07:00 AM   #5
68mustang405
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I did the clean/Jet and the sync. Shot fluid through all the orfices. This is probably my 7-8 carb rack set so I'm fairly confident it's clean. It accelerates everywhere amazing. That's what makes me think it's not in the carbs and it could be either electrical or something else? TPS sensor? I had to take out the metal inserts to get it adjusted according to the manual, but when I bench tested the tps it all passed so that was kind of weird.

Carb float was set 14mm from base of carb body to top of float with a micrometer.
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Old 02-18-2018, 07:53 AM   #6
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Are you just doing some or all of the listed mods or have they been on the bike for a while? When was the last time it ran well?

Seems like you need to eliminate jetting issues from the question.

If it ran well at some time (last season?) then I would think something is clogged in the carbs. I'd run a couple tanks with sea foam fuel cleaner before diving into carbs.

If your just doing the mods then I've got nothing to suggest.
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Old 02-18-2018, 07:47 PM   #7
68mustang405
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I bought it running like this, It had a K&N, with a dynojet kit. I've replaced the air filter, cleaned the carbs, ran with some jetting suggestions based on raven riders carb settings as well as some other info I found on the board. This has all been done in less than 200 miles ago. It's improved but hasn't been eliminated fully.
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Old 02-19-2018, 12:58 AM   #8
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Quote:
Originally Posted by 68mustang405 View Post
If I full throttle it from idle it seems to bog until about 2500 then takes off. Is this normal for this bike?
Yes, if you really are giving it snap throttle to WFO from idle, chances are it will bog a little - if not a lot.

You might not notice it much in 1st gear but anything higher and it will be progressively more noticeable.

You could drive yourself nuts trying to dial it out. Just make sure everything is properly clean and adjusted, then modify your throttle use to live with what the motor feels happiest doing.

I would check/adjust 2 things: set mixture screws to 31/2 to 4 turns out and inspect throttle slides springs. They may have been cut by the PO and this could be making the bog you describe worse.
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Old 02-19-2018, 06:29 AM   #9
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My question was exploratory. If you're in gear and rolling, at idle, I would expect it to do nothing BUT bog when whacking it WOT.

If you meant the bike was stationary and in neutral, not sure why you'd want to hit it with WOT. High rpm with zero load.....it just isn't nice.

As you reported, it accelerates "everywhere amazing", so I'm failing to understand the problem. Its probably just me though. Nope, definitely. In any case, it sounds like you have a good running bike otherwise.
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Old 02-19-2018, 07:16 AM   #10
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Are the current jet/carb settings Stock? if not, how about putting everything back to OEM to see if it runs better...
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Old 02-19-2018, 08:13 AM   #11
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Just send the carbs to Ivan. He will clean them properly, install his jet kit and tune/set everything where it needs to be. All you have to do is install the carbs and sync them.
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Old 02-19-2018, 09:01 AM   #12
68mustang405
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Quote:
Originally Posted by Falcon 269 View Post
Yes, if you really are giving it snap throttle to WFO from idle, chances are it will bog a little - if not a lot.

You might not notice it much in 1st gear but anything higher and it will be progressively more noticeable.

You could drive yourself nuts trying to dial it out. Just make sure everything is properly clean and adjusted, then modify your throttle use to live with what the motor feels happiest doing.

I would check/adjust 2 things: set mixture screws to 31/2 to 4 turns out and inspect throttle slides springs. They may have been cut by the PO and this could be making the bog you describe worse.
I tried adjusting them out that much, I didn't care for it because the bike didn't need a choke when cold as well as smelling rich all the time. I checked the springs and they were not cut. Thanks for the input!

Quote:
Originally Posted by iluvmyfz1 View Post
My question was exploratory. If you're in gear and rolling, at idle, I would expect it to do nothing BUT bog when whacking it WOT.

If you meant the bike was stationary and in neutral, not sure why you'd want to hit it with WOT. High rpm with zero load.....it just isn't nice.

As you reported, it accelerates "everywhere amazing", so I'm failing to understand the problem. Its probably just me though. Nope, definitely. In any case, it sounds like you have a good running bike otherwise.
I agree with most of your statement in that it could be me. However when I first took it out, I slip the clutch where when it's fully engaged i'm at around 1500 then I wack it open if I want to move. This works on every bike I've ever owned. Carb'ed or otherwise. I don't care much to slip it at 2500 till it gets past the flat spot. It sounds like a newbie taking off in my opinion. It was bad enough that I couldn't keep up with my friends taking off at a stoplight. This was just regular taking off, maybe 1/2 throttle and there'd be a noticeable bog that if you didn't back off it would fall on it's face. I got most of it out I think, I might just have to modify my riding style. Just something I don't recall on the first one I had, (been 3+ years).

Quote:
Originally Posted by ralphcor View Post
Are the current jet/carb settings Stock? if not, how about putting everything back to OEM to see if it runs better...
Everything posted in the initial post is how it's set up currently. It has an aftermarket pipe so there's no way to put it back stock. I don't have the stock needles or jets either.

Quote:
Originally Posted by klj7734 View Post
Just send the carbs to Ivan. He will clean them properly, install his jet kit and tune/set everything where it needs to be. All you have to do is install the carbs and sync them.
I'm not a throw my hands up in the air type of guy. I've also heard people complain of this same symptom AFTER Ivan's jet kit. If I felt like that would fix it I would look into it.
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Old 02-19-2018, 09:47 AM   #13
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Quote:
Originally Posted by 68mustang405 View Post
I tried adjusting them out that much, I didn't care for it because the bike didn't need a choke when cold as well as smelling rich all the time. I checked the springs and they were not cut. Thanks for the input!
Sounds too rich. From the sounds of it, the jetting sounds close depending on your altitude.

I’m sure you’ve checked it, but what’s the air filter look like, any obstructions in the box?
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Old 02-19-2018, 10:41 AM   #14
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Thanks for the more detailed explanation, I understand a bit more now. I would look for vacuum leaks. Port caps, hoses if you have the crossover mod, good connection to the boots, etc. As these are CV carbs, you may need to closely inspect the diaphrams for microscopic holes. That could cause a delay in the slides coming up.
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Old 02-21-2018, 06:36 PM   #15
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Possibly the EXUP...
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Old 09-20-2018, 07:03 AM   #16
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Did you ever resolve this? I would be interested to know what you found, I have a very similar problem, mine bogs, pulling away I need to slip the clutch to get it going. It seems rough on tickover and I can't improve it with the mixture.

I've gone through the carbs, cleaned a few times, balanced etc. With new plugs there appears to be a marginal improvement.
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Old 09-20-2018, 08:34 AM   #17
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My money is on a dirty fuel filter
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Old 09-20-2018, 12:03 PM   #18
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put it on your local dyno, from that the tuner can easily determine your issue. my money is on your jetting is not correct for your bottom end.
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