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Old 03-29-2011, 10:01 PM   #1
ccmhunt
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Float height

Ok, since this comes up ever so often and Armi is struggling with it, here we go.
Your float system does several things:
First and foremost, and having nothing to do with adjusting anything, it serves as your final safety valve to control and stop fuel flow into your carbs. Our bikes do not have a manual petcock, and therefore no "OFF" position, but rather opened and closed via vacuum provided via tubing from an intake manifold. In other words, your motor must be running, to provide vacuum (unless your petcock is faulty) to flow fuel to the carbs. Should it fail, your float system should shut fuel flow off via the needle and seat. Should your needle and seat fail, you will likely overflow the float bowls on the lower (leftmost carbs) if it sits on a sidestand, it will drain down the intakes and fill the combustion chambers, possibly leading to hydrolock on startup. At the very least it will drain past the rings and contaminate your engine oil, possibly causing lower end bearing damage.

Secondly, and for the purpose of this post, float height can contribute to low rpm jetting maladies (full throttle and steady state cruise), engine run-on in hard braking, and minor irritability.
The floats are sensitive to impact. therefore....if you trailer your bike long distances or drop a carbed bike....check your float height.
If you have an engine loading up and not idling down under hard braking, try lowering float height.
If your bike runs clean at low rpm when cold but not once warmed up, and testing shows that your pilot jet is correct, rather than go back down to a smaller pilot jet....lower your fuel level 1mm (raise float level)
Running rich at part throttle is usually a symptom of too high a fuel level.
Remember: Lowering your float height raises the floats which raises the level of fuel in the bowls. Raising the float height lowers the level of fuel in the bowls.
So, the obvious: remove seat, raise tank, remove air box, cables, remove and drain carbs.

Remove float bowl covers

Invert your carbs so that you may better manipulate them as a vertical column and control the compression of the needle and seat.
Here is the trick: slowly tilt the carbs so that the tang on the float drops the needle all the way down into the seat, BUT DOES NOT COMPRESS THE NEEDLE. Verify by depressing float with your finger and watching it rebound!
Now, measure from gasket mating surface to top of float....the standard setting for both 600 and 750's is 8mm.


Use a pick or small screwdriver to bend the tang, which in turn, raised and lowers the floats.

Make sure that in doing so, you do do pry the tang out of the arms of the needle that keep the two engaged.

I use a rather expensive Kowa Seiki tool that I have had for 16? years
You can use vernier calipers, rulers, or even make a plastic gauge......
What did I leave out?
__________________
[QUOTE=senator8]Haha! You're more than 1%. My bike ran perfectly all year. All I did was oil changes and thumbed the starter. While my competitors had bikes and carbs in pieces at the track I was enjoying a coffee and saying "thanks Chris"
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Old 03-29-2011, 10:22 PM   #2
Chocolate_Rain
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Re: Float height

Where's the pic of the beer that was consumed, before, during, and after?
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Old 03-29-2011, 10:25 PM   #3
project15
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Re: Float height

Excellent write up yet again. I think I know my problem now - I was measuring to the top of the "lip" on the float, not the very top of the float itself which would put the height at 9-10mm rather than 8mm. I'm eager to take the carb apart and use all this knowledge that you've imparted on us.
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Old 03-30-2011, 12:57 PM   #4
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Re: Float height

Have'nt had a chance to look at this properly but CCM, really appreciate your efforts, to educate me and others on here.
Bless you man.
Off to a wedding, i don't want to go to.......would much rather stay here....lol.
Cheers!!!
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Old 04-02-2011, 02:46 PM   #5
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Re: Float height

so if the floats are to high would this cause my bike to backfire?
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Old 04-02-2011, 03:36 PM   #6
ccmhunt
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Re: Float height

backfire when.....popping on deceleration...or backfiring on full throttle acceleration.
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Old 04-02-2011, 07:21 PM   #7
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Re: Float height

when its idling lol
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Old 04-03-2011, 12:27 AM   #8
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Re: Float height

Many people do not even understand the difference with a BACKfire and a pop from the tail pipe.

So what one do you have?

Back fire I would lean on the side of being rich on the pilot, a float that is too high, or timing that is off.

John
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Old 04-04-2011, 12:16 PM   #9
Derrty750
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Re: Float height

I think it's coming from the exhaust, and if its from the exhaust what could I do to stop it? I'm planing on synching the carbs when its a little nicer out.
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Old 04-05-2011, 08:43 AM   #10
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Re: Float height

Carb sync could help. Otherwise I would start checking into the cam timing and valve clearance. Maybe new plugs.

John
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Old 04-05-2011, 08:47 AM   #11
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Re: Float height

Quote:
Originally Posted by ccmhunt View Post
What did I leave out?
When reassembling the carbs, I'd strongly suggest that the float bowl gaskets get replaced. They lose their elasticity fast and don't like to seal well the second time.

JR
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Old 08-02-2011, 10:04 AM   #12
mr_D
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Re: Float height

bumping this as i want to refer to it and bring it closer to the top
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Old 08-02-2011, 12:18 PM   #13
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Re: Float height

You know you can subscribe to these threads, rather than bumping them Mr_D?
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Old 08-02-2011, 12:33 PM   #14
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Re: Float height

I vote for making it a sticky !!!!
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Old 08-02-2011, 12:45 PM   #15
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Re: Float height

Quote:
Originally Posted by TT750 View Post
I vote for making it a sticky !!!!
+1

I reckon it should be also.
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Old 08-02-2011, 02:13 PM   #16
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Re: Float height

yeah but subscribing wont bring it back to the top as well
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Old 02-29-2012, 08:37 AM   #17
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Re: Float height

the awesomeness of this post is astounding
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Old 02-29-2012, 10:18 AM   #18
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Re: Float height

to bad he didnt have his black gloves back then
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Old 02-29-2012, 12:31 PM   #19
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Re: Float height

Quote:
Originally Posted by ccmhunt View Post
The floats are sensitive to impact. therefore....if you trailer your bike long distances or drop a carbed bike....check your float height.
If you have an engine loading up and not idling down under hard braking, try lowering float height.
exactly what I do and what I am experiencing.

are there increments to lowering the float height or is it pretty much guess and check? If the latter, that would suck a lot at a track day.
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Old 02-29-2012, 01:26 PM   #20
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