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CB400 Superfour idling problems (restricted)

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B0ndy
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Joined: 25 May 2015
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PostPosted: 11:27 - 03 Jun 2015    Post subject: CB400 Superfour idling problems (restricted) Reply with quote
Hello everyone,

I recently purchased my first "big" bike, a Honda CB400 Superfour 93, after passing my mod1 and mod2 tests to gain an A2 license.

Yesterday I did some maintenance and removed fuel tank in the process, I ran the bike out of juice before removing the tank, this is where all my problems have started.

Today when riding the bike started up but it wasn't idling correctly and while taking it for a ride it cut out on me Sad .

I've fiddled with the idle screw to get it to idle correctly however it doesn't seem to have made a difference.

Here's a video a made to show how the bike idles, please note that I did not touch the throttle during the video

https://www.youtube.com/watch?v=usDdd68Sdtc&feature=youtu.be

Any help or advice is appreciated
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CBF 125 -> CB400SF -> GSX600F -> ZX6R (G1) -> GSXR1000 K4 -> ZX6R (B1H Stunt bike) -> VFR800 -> R1 5PW -> Sprint 1050 -> Fireblade 929 -> ZX10R C2H -> GSXR1000 K3

Last edited by B0ndy on 11:45 - 03 Jun 2015; edited 1 time in total
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B0ndy
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PostPosted: 11:35 - 03 Jun 2015    Post subject: Reply with quote
Vincent wrote:
It probably needs the carbs setting up, or.........you have an air leak somewhere between the carbs and the cylinders.


Thanks Vincent. I did remove the fuel tank yesterday and before removing the fuel tank to do some maintenance I switched the petcock to the off position and run it out of juice so I didn't have petrol going everywhere after removing the tank, this is where all my problems started.
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CBF 125 -> CB400SF -> GSX600F -> ZX6R (G1) -> GSXR1000 K4 -> ZX6R (B1H Stunt bike) -> VFR800 -> R1 5PW -> Sprint 1050 -> Fireblade 929 -> ZX10R C2H -> GSXR1000 K3
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mudcow007
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Joined: 01 Feb 2012
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PostPosted: 11:58 - 03 Jun 2015    Post subject: Reply with quote
do you think you have sucked crap in the carb by letting it use all the fuel in the tank?

whip the carb(s) off an give em a quick clean
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UncleFester
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Joined: 30 Jun 2013
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PostPosted: 13:10 - 03 Jun 2015    Post subject: Reply with quote
These have carb drain screws do they not?

As per Mudcow suggestion - you've probably drawn crap into the carbs or the pipes that feed them.
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Rogerborg
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Joined: 26 Oct 2010
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PostPosted: 13:27 - 03 Jun 2015    Post subject: Re: CB400 Superfour idling problems (restricted) Reply with quote
mbond65 wrote:
I ran the bike out of juice before removing the tank

Not a problem for the carbs. However, I'd strongly suspect that you've sucked crap from the bottom of the tank either when running it dry or after disturbing it, and clogged one or more jets.

You could try various degrees of non-invasive fixing but it'll probably be quicker in the long run if you just whip them out and clean the jets properly.

In addition, have a look in the tank and see if it's rusting, clean it out thoroughly and fit a filter in the fuel line.
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GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike
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B0ndy
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PostPosted: 13:31 - 03 Jun 2015    Post subject: Reply with quote
Thanks for your help all, I've decided that I'm going to get the carbs off and give them a clean as suggested
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CBF 125 -> CB400SF -> GSX600F -> ZX6R (G1) -> GSXR1000 K4 -> ZX6R (B1H Stunt bike) -> VFR800 -> R1 5PW -> Sprint 1050 -> Fireblade 929 -> ZX10R C2H -> GSXR1000 K3
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B0ndy
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Joined: 25 May 2015
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PostPosted: 13:36 - 03 Jun 2015    Post subject: Re: CB400 Superfour idling problems (restricted) Reply with quote
Vincent wrote:
mbond65 wrote:


I've fiddled with the idle screw to get it to idle correctly however it doesn't seem to have made a difference.



Deffo he right screw?


Yes definitely the right screw - sorry what I said wasn't worded correctly, my mistake. What I meant was that the idle screw does make a difference to the idle speed but the bike still doesn't idle correctly, the idle speeds keeps varying in rpm and doesn't sound "right".

Thanks for checking though Very Happy
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CBF 125 -> CB400SF -> GSX600F -> ZX6R (G1) -> GSXR1000 K4 -> ZX6R (B1H Stunt bike) -> VFR800 -> R1 5PW -> Sprint 1050 -> Fireblade 929 -> ZX10R C2H -> GSXR1000 K3
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Rogerborg
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Joined: 26 Oct 2010
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PostPosted: 13:37 - 03 Jun 2015    Post subject: Reply with quote
mbond65 wrote:
Thanks for your help all, I've decided that I'm going to get the carbs off and give them a clean as suggested

Be careful your restrictor washers don't fall out. Wink
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Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike
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B0ndy
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PostPosted: 13:43 - 03 Jun 2015    Post subject: Reply with quote
Rogerborg wrote:
mbond65 wrote:
Thanks for your help all, I've decided that I'm going to get the carbs off and give them a clean as suggested

Be careful your restrictor washers don't fall out. Wink


hehe Very Happy
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CBF 125 -> CB400SF -> GSX600F -> ZX6R (G1) -> GSXR1000 K4 -> ZX6R (B1H Stunt bike) -> VFR800 -> R1 5PW -> Sprint 1050 -> Fireblade 929 -> ZX10R C2H -> GSXR1000 K3
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Old Thread Alert!

The last post was made 11 years, 97 days ago. Instead of replying here, would creating a new thread be more useful?
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