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Offline ron.cieri.313

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Fast Idle Problem
« on: November 30, 2008, 04:16:43 PM »
Okay, so my Honda K6 750 is now running but the idle is horribly fast.  This bike has been sitting for five years and I've done all the regular stuff to getting it running including cleaning and rebuilding the carbs...actually is sounds pretty good just too fast.  The only way I can seem to control the RPM's is by activating/closing the choke nearly all the way...this led my to believe I just had the idle screws open too much but this still happens with them closed all the way...so are the carbs getting too much gas?...check the throttle screw and it cannot go any lower...i.e., the slides are all the way down...float height problem?...I don't know...that just seem right...there height seemed consisten when I just eyeballed 'em...help?...thanks!...ron.
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Offline ron.cieri.313

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Re: Fast Idle Problem
« Reply #1 on: November 30, 2008, 04:20:39 PM »
Btw...I don't think it is a slow jet problem because she starts right up.
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Offline 05c50

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Re: Fast Idle Problem
« Reply #2 on: November 30, 2008, 06:47:26 PM »
Sometimes if the carbs are not synced correctly, it will cause idle racing. Also check for vacuum leaks at the carb boots.

...........Paul
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Offline ron.cieri.313

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Re: Fast Idle Problem
« Reply #3 on: November 30, 2008, 07:08:54 PM »
Yes, I thought about vacuum leaks at the carb boots and it is possible I guess but I've visually check all four connections and they are tight and on all the way. 

If syncing is a possibly cause on these fours (my only other experience is with the CB450) then I guess that is the more possible as I've only set them at the same number of screw turns at this point.

So maybe syncing should come before setting the timing?
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Offline ron.cieri.313

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Re: Fast Idle Problem...gas dripping from overflow tubes
« Reply #4 on: December 01, 2008, 08:35:22 PM »
k..ordered the manometer so I can sync the carbs...as she sits, some gas appears to be dripping out of the overflow tubes...a substantial enough to form a small puddle...is this a float height setting problem?....maybe related to the high idle?
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Offline 05c50

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Re: Fast Idle Problem
« Reply #5 on: December 02, 2008, 04:19:30 AM »
Might be float setting,dirt in float valves,float pins sticking,brass overflow tubes cracked.

......Paul
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Offline ron.cieri.313

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Re: Fast Idle Problem
« Reply #6 on: December 02, 2008, 05:34:36 AM »
I'm going to go with setting on the most likely...I visually checked the pin and was pretty meticulous on cleaning...but ya never know....but it could significantly impacting my idle problem, correct?
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Offline dusterdude

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Re: Fast Idle Problem
« Reply #7 on: December 02, 2008, 01:54:17 PM »
do your carbs have that fast idle doo hickey for when its cold?
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Offline ron.cieri.313

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Re: Fast Idle Problem
« Reply #8 on: December 02, 2008, 07:33:07 PM »
I believe they just have a idle air screw, a plug screw and choke as far as adjustments are consider...so no fast idle do hickey i don't think.
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Offline TwoTired

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Re: Fast Idle Problem
« Reply #9 on: December 02, 2008, 07:36:26 PM »
Are you sure the individual slide adjusters aren't tweaked enough to prevent the slides from closing fully when the idle stop is turned out?
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Offline ron.cieri.313

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Re: Fast Idle Problem
« Reply #10 on: December 02, 2008, 07:43:19 PM »
hmmm, well, i did notice that the slides which have an inverted u shape when viewed from the cylinder outlet did have a consistent, say, 3-4 millimeter gap from the bottom of the housing...should this not be?...how do i adjust lower?

i did carefully check that the choke completely closes all main air intakes on all four carbs.
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Offline TwoTired

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Re: Fast Idle Problem
« Reply #11 on: December 02, 2008, 08:00:40 PM »
The slide cutaways should face the filter.
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Lloyd... (SOHC4 #11 Original Mail List)
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Offline ron.cieri.313

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Re: Fast Idle Problem
« Reply #12 on: December 02, 2008, 08:14:43 PM »
They are not symmetrical?...is it possible to put them in wrong?!
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Offline 05c50

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Re: Fast Idle Problem
« Reply #13 on: December 02, 2008, 08:18:23 PM »
You can do anything....if you use a big enough hammer.

.......Paul
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Offline ron.cieri.313

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Re: Fast Idle Problem
« Reply #14 on: December 02, 2008, 08:22:26 PM »
lol...no, no hammer involved but I thought the plate on top of the slides prevented such ignorance on my part...but, I think I better check.
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jsaab2748

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Re: Fast Idle Problem
« Reply #15 on: December 02, 2008, 08:24:16 PM »
Quote from: ron.cieri.313 on December 02, 2008, 08:14:43 PM
They are not symmetrical?...is it possible to put them in wrong?!


They should only fit one way, and are all the same for all four carbs,
no left or right handed ones.
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Offline Bodi

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Re: Fast Idle Problem
« Reply #16 on: December 02, 2008, 08:30:48 PM »
I think 1 and 3 have the key on the "left" and 2 & 4 have the key on the "right", so they can all be reversed if you really try hard.
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jsaab2748

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Re: Fast Idle Problem
« Reply #17 on: December 02, 2008, 08:40:50 PM »
Just checked a fisch and all have the same part number. They all are "keyed" towards the right side. I think the early K0"s were different tho, having an idle speed screw for each carb.
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