96 zx6r setup help - ZX6R Forum
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post #1 of 15 Old 03-27-2017, 10:49 AM Thread Starter
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96 zx6r setup help

Hi
My zx6r needs a little help. After a few issues of cutting out randomly at roundabouts and hard starting I began to tinker. After reading a lot on here I'm fairly confident the cut out is a worn clutch. Or at least a contributory factor.
However, I had the carbs ultra sonically cleaned so they are pretty but on putting it back together she starts and idles nice but when riding is breathless, certainly up top. Also tops out about 110. She wants to go but can't. I put all the idle screws at 2 turns. What would anyone suggest moving forward?
Thanks
Paul
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post #2 of 15 Old 03-30-2017, 11:22 AM Thread Starter
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Bump
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post #3 of 15 Old 03-30-2017, 11:54 AM
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If the clutch were worn out, it would slip -- that would limit your top speed. Engine revs would go up out of proportion to the change in speed. that's when it's slipping.

if it idles well and runs worse at higher RPM, that's more likely to be related to the state of tune, than the clutch. Typically if the carbs are gummed up that is worst when the bike is running on the lowest speed circuit, as the passages in the carbs are smaller and gum up more (first) there.

If your fuel filter is clogged, the bike would starve for fuel when you place a bigger demand on it. It may be able to flow enough fuel for idle and fall on it's face when you ask for 4X as much, as an example.

Any way you look at it, one of three things is not as it should be. Air, fuel, or spark. If it idles and runs smoothly, odds are fair it's not air or spark.

Is there any rust or debris in the fuel tank, or in the fuel filter?

What is the condition of all of the vacuum lines that are supposed to be connected to the carbs? Do you have a carb balancing tool? Can you synch them?

When was the last time the valve clearances were set? How old are the spark plugs and wires?

"There's this adage that we have 2 ears and one mouth so we should listen twice as much as we talk. Unfortunately with the Internet people have taken this old adage and turned it around. They have two eyes and 10 fingers so they think they need to post 5 times as much as they read. And since they have 10 fingers and one brain, they only have to think 10% of the time! "
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post #4 of 15 Old 03-31-2017, 07:14 AM Thread Starter
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Hi
Thanks for the detailed reply. I'll answer some of the questions. The bike has just over 40k on the clock.
It had new plugs, ignition packs, leads and HT caps last year and has done a few hundred miles since.
I checked valve clearance last summer and they seemed in tolerance and I have the kit to balance the carbs which had been done. I've ordered a new fuel filter as I have no idea when this was ever changed.
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post #5 of 15 Old 04-02-2017, 04:24 AM Thread Starter
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I think when the new fuel filter arrives I will also check float heights. I have read they should be between 15 and 19mm. So if I go with 17mm I should be safe
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post #6 of 15 Old 04-02-2017, 04:59 AM
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Sounds like a good place to start.... I'd also take a flashlight and shine it in the tank to see how much rust is in there. If the valves are close, the spark is good; that only leaves fuel.

Aside from some blockage of the intake system (-- bad air filter, rodents in residence in the air box, plugged exhaust), fuel is the most likely culprit.

"There's this adage that we have 2 ears and one mouth so we should listen twice as much as we talk. Unfortunately with the Internet people have taken this old adage and turned it around. They have two eyes and 10 fingers so they think they need to post 5 times as much as they read. And since they have 10 fingers and one brain, they only have to think 10% of the time! "
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post #7 of 15 Old 04-06-2017, 02:16 PM Thread Starter
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Hi
Today I adjusted the floats. I went for a middle figure of 17mm. Online it says 15 to 19mm. I also fitted a nice new fuel filter.

I then test rode her to get some 99 octane fuel and she is now riding very well.
I will give her the full test tomorrow as I have a 50 mile ride for her. This seems to have sorted the idle cutting out problem as well as the short of breath problem.
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post #8 of 15 Old 04-07-2017, 10:39 AM Thread Starter
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So after a test today I have found its bogging below 3500rpm but rides well above it. The cutting it out has reduced massively which is good but from high revs to stop caused it to cut out once
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post #9 of 15 Old 04-07-2017, 12:11 PM
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Is your idle speed set correctly? Too low, will cause issues....

"There's this adage that we have 2 ears and one mouth so we should listen twice as much as we talk. Unfortunately with the Internet people have taken this old adage and turned it around. They have two eyes and 10 fingers so they think they need to post 5 times as much as they read. And since they have 10 fingers and one brain, they only have to think 10% of the time! "
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post #10 of 15 Old 04-07-2017, 01:26 PM Thread Starter
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It currently sits at about 1500 rpm when warm ?
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post #11 of 15 Old 04-07-2017, 02:07 PM
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That should be fine.... you can turn it up a bit and see if it improves.

"There's this adage that we have 2 ears and one mouth so we should listen twice as much as we talk. Unfortunately with the Internet people have taken this old adage and turned it around. They have two eyes and 10 fingers so they think they need to post 5 times as much as they read. And since they have 10 fingers and one brain, they only have to think 10% of the time! "
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post #12 of 15 Old 04-08-2017, 12:56 PM Thread Starter
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I'm taking her out in the morning so will tinker with the idle a bit.

My brother still suggests the idle mixture is out. I was thinking of putting thumb mixture screws in so I can adjust whilst on the bike.
What do you think?
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post #13 of 15 Old 04-08-2017, 02:00 PM
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Not a good idea, because each carb has it's own mixture adjustments. No way you can balance all four while riding.

Getting the carbs synchronized would tell you the whole story.

"There's this adage that we have 2 ears and one mouth so we should listen twice as much as we talk. Unfortunately with the Internet people have taken this old adage and turned it around. They have two eyes and 10 fingers so they think they need to post 5 times as much as they read. And since they have 10 fingers and one brain, they only have to think 10% of the time! "
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post #14 of 15 Old 04-09-2017, 01:07 AM Thread Starter
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Sorry I wasn't going to adjust whilst riding only when at idle.
I can synchronise the carbs again now she's running a bit better and hope that sorts it :-)
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post #15 of 15 Old 04-09-2017, 08:45 AM Thread Starter
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An awesome ride today Confirmed a mild breathlessNess at 12000 to 14000 rpm and maybe a bit of bogging pulling away. However this is so much better than before
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