CBF1000

CBF1000 => General Maintenance, Servicing, and Mechanical => Topic started by: Midlife on 07 June, 2019, 10:21:16 PM

Title: Exhaust manifold red hot, engine not sounding right.
Post by: Midlife on 07 June, 2019, 10:21:16 PM
Biker down, Biker down!!!

Hope some one can help with this issue. I decided to do some routine maintanence on the bike myself after seeing that one of my forks was leaking oil, fork seal change, no biggy but then i thought why not go all in and carry out an oil change, engine oil change, replace the spark plugs and strip the bike and give it an deep clean and sort out them annoying bits of rust.

I have just flashed the bike up and it took a few goes to start but starts each time since but it sounds rough in idle.

Also, my exhaust manifold is glowing red hot, only from the bit just where you ankle is, but its so hot its smoking.

I'm thinking the rough sound at idle could be I've not seated one of the spark plugs correctly but I'm worried about the exhaust. I don't understand why its getting so hot.

I'm hoping someone can call me a noob and suggest an easy fix.

Thanks in advance.
Title: Re: Exhaust manifold red hot, engine not sounding right.
Post by: Art on 08 June, 2019, 06:53:57 AM
The engine misfire is causing unburnt fuel to enter the exhaust system where it burns causing the red hot exhaust pipe. Cure the misfire and you'll cure the glowing red pipe. You may also have a leak in the exhaust pipe since that fuel would also need some oxygen for it to burn, check the exhaust clamps and exhaust joints just in front of the red hot pipe.

Hint - Since its the offside pipe that is glowing red hot the misfire is probably cylinder 3 or 4, note here that many a DIY'er on here has reported difficulty in pulling the number three plug cap which may be a good place for you to start.
Title: Re: Exhaust manifold red hot, engine not sounding right.
Post by: Midlife on 08 June, 2019, 09:38:48 AM
Thanks for the advice Art. I was going to check the plugs but didn't even consider the exhaust clamps.
Title: Re: Exhaust manifold red hot, engine not sounding right.
Post by: Admin on 08 June, 2019, 09:41:04 AM
Agree with Art. Also wonder if those plugs are in correctly and importantly check that the HT leads are properly connected to the plugs ? If there's not much of a spark then you'll get some unburnt fuel ....

Only reason I mention that is because that's what you changed. Did you do any other work ?
Title: Re: Exhaust manifold red hot, engine not sounding right.
Post by: Midlife on 08 June, 2019, 10:33:05 AM
The only engine related work I done was changing the engine oil and filter, air filter and spark plugs. I thought things went too smoothly. The exhaust clamp is quite badly rusted on the one side so I'm wonder if that's letting air in like Art suggested and I've aggravated it when scrubbing that coupled with my inability to change spark plugs could have caused this???

I'll pull plugs and I've ordered a new clamp to replace the rusted one even though it does seen to be holding firm, might as well be on the safe side.

The pic I posted was after about 30secs of starting the bike, it got hot really quickly. Can unburnt fuel cause it to heat up so fast to the point where its molten hot after just a minute or so??
Title: Re: Exhaust manifold red hot, engine not sounding right.
Post by: Art on 08 June, 2019, 04:54:57 PM
Yes.

I trust you read this rather than opt for the OEM part

link https://www.cbf1000.com/index.php/topic,20484.msg242775.html#msg242775
Title: Re: Exhaust manifold red hot, engine not sounding right.
Post by: Midlife on 08 June, 2019, 05:59:11 PM
 :232: No......,, I never!!! OK, let's get that returned and the NON- OEM part ordered 😂

Cab anyone confirm what size I would need for a Mk2 2011 bike. Unable to check as at the airport flyong to Spain for a wee break
Title: Re: Exhaust manifold red hot, engine not sounding right.
Post by: Art on 08 June, 2019, 07:42:42 PM
I don't know but raw-power-motorcycles are offering 'Honda CBF1000 FA ABS C SC64D 2012-14 Mikalor Stainless Exhaust Clamp EXC555' for £6.69 delivered. Not as competitively priced as ordering from racebikebitzuk but you're saving hard earned and getting a better product than the Honda OEM £32.00 offering

links

https://www.ebay.co.uk/itm/Honda-CBF1000-FA-ABS-C-SC64D-2012-14-Mikalor-Stainless-Exhaust-Clamp-EXC555/181982268873?epid=1153611985&hash=item2a5efd0dc9:g:yiwAAOSwNMVaV3iI

http://www.rawpowermotorcycles.co.uk/-mikalor-stainless-exhaust-clamp-zinc-bolt-exc555-c2x19282262

or if someone gets down and measures there's

https://www.ebay.co.uk/itm/321778268047?_trksid=p2057872.m2749.l2649&var=510692247489&ssPageName=STRK%3AMEBIDX%3AIT
Title: Re: Exhaust manifold red hot, engine not sounding right.
Post by: Piper on 08 June, 2019, 08:28:52 PM
Its very easy to damage the no 3 spark plug lead when changing the plugs on the mark 1 cbf so maybe the same on the mk2. Many on here have had that problem.
Title: Re: Exhaust manifold red hot, engine not sounding right.
Post by: hondacbf on 11 June, 2019, 02:31:06 PM
Iíve never done the plugs myself but is it possible for the leads to be connected to the wrong plug (plugs) !. As you say it is rough at idle. If it was running ok before starting the service, I would go back over everything you did methodically and rule things out.
Title: Re: Exhaust manifold red hot, engine not sounding right.
Post by: Midlife on 13 June, 2019, 07:45:10 AM
I changed the plugs one at a time just to make sure I avoided F%&*ING UP!!! Guess I failed in that regard. But one positive to come out of this is I've learnt a little more about the bike, bike maintenance in general thanks to you guys so thank you. I've just got back to the UK so after a little sleep I'm going to tackle this today and I'll let you know how I get on.
Title: Re: Exhaust manifold red hot, engine not sounding right.
Post by: Midlife on 14 June, 2019, 09:15:21 AM
Thats the bike back on the road with no red hot exhaust or grumbling like its got rocks running through the engine. I stripped off the fairing to get at the spark plugs. Checked they were in, seated and plugged in. Pulled one out just to make sure I was using the correct type and I was but the engine was still not sounding great.

At this point I delved into my years of engineering experience, putting all those years of training to good use and deduced the cause of the problem.

See attached pic, whats missing  :232: :232: :232: :157: :157: :232: :192:
Title: Re: Exhaust manifold red hot, engine not sounding right.
Post by: Admin on 14 June, 2019, 09:56:24 AM
 :138:

Oh well..... at least it's running now which is the main thing. Guess we've all been there with something similar at some poiunt or another  :001: :001:
Title: Re: Exhaust manifold red hot, engine not sounding right.
Post by: Art on 14 June, 2019, 10:21:32 AM
Good news.

Checking spark plug caps and ignition coil connections would have been my next port of call.
Title: Re: Exhaust manifold red hot, engine not sounding right.
Post by: MexiCan on 07 September, 2019, 03:52:18 PM
Pardon my ignorance but, what is the module that appears unplugged in the picture?
I had a similar problem a few years back while in the middle of the Blue Ridge Mountains. Honda had no idea what it was (folks not too familiar with this kind of bike on this side of the pond). A racing guru looked at it and determined that the wiring harness was loose and he simply reconnected it properly (after a couple of thousand dollars in spark plug and battery changes as well as time spent waiting for repairs in the US and transportation costs for the bike back home). I have had no problems since. Honda could only determine that 2 cylinders were not working and suggested I needed a new engine!
Title: Re: Exhaust manifold red hot, engine not sounding right.
Post by: Art on 07 September, 2019, 04:01:24 PM
That's the ignition coil for cylinders #1 and #4, there's another on the left side for cylinders #2 and #3.
Title: Re: Exhaust manifold red hot, engine not sounding right.
Post by: MexiCan on 07 September, 2019, 05:22:04 PM
Thank you Art.
Since I have no clue as to the whereabouts of the wiring harness connector, I wonder if this coil was the actual culprit. Strange that the main issue with my bike was exactly as described in this post.