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Offline Mikeyh66

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cbf1000 misfire low revs
« on: 13 June, 2019, 06:26:52 PM »
SODS LAW. CBF1000A6 up for sale and buyer wanted to view so got out of shed to fill up the tank ready . Tried starting and sounded like firing on 2 cylinders ?. Wouldnt tick over and strong smell of petrol so thought take for run and see. Filled up with super unleaded but really bad, had job to keep running on road. High revs not a problem (flying) but low revs nightmare. Bike shop has bike now, fitted new plugs still the same and now informs me the fuel pump isnt making noise when ignition turned on though it was when it left here. Trying a used pump to see but to me its electrical as not firing on all cylinders but not a mechanic. Anyone had this problem. Help as selling bike. :232:

Offline Raphe

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Re: cbf1000 misfire low revs
« Reply #1 on: 13 June, 2019, 07:24:01 PM »
Sounds like the dreaded stator. That’s the same symptoms I had. Hope not though for your sake. Check voltage.

Offline phild

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Re: cbf1000 misfire low revs
« Reply #2 on: 13 June, 2019, 08:11:24 PM »
New stator is £100 fix.

I bet new plugs plus labour is more?


Offline Mikeyh66

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Re: cbf1000 misfire low revs
« Reply #3 on: 13 June, 2019, 08:19:31 PM »
Shop now saying fuel pump not making noise when ignition turned on (cant win) though it was when it left. Had a few bikes and nothing like this. :172:

Offline Art

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Re: cbf1000 misfire low revs
« Reply #4 on: 13 June, 2019, 10:11:34 PM »
Firing on two cylinders yet alls well at higher engine speeds, probably water ingress or a loose ignition coil connection, especially if the misfiring is 1 & 4 or 2 & 3 (they share coils). Unlikely to be two spark plugs failing at the same time but don't completely rule it out. I'd like to hear the logic that connects this to a stator fail?!

Check ignition coil connections, spark plug caps and spark plugs before a full on trouble shooting of the Ignition System.

If the fuel pump is now not kicking in suspect on ABS models the 20A FI/IGN fuse (fuse G next to the battery) or non ABS models the 20A FI/IGN fuse (fuse F in the under seat fuse box). Note a short or loose connection at the coils could cause this fuse to blow and could also cause the engine to misfire on two cylinders.
« Last Edit: 13 June, 2019, 10:24:50 PM by Art »

Offline Mikeyh66

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Re: cbf1000 misfire low revs
« Reply #5 on: 13 June, 2019, 10:25:57 PM »
Thanks for the info. Will give to the shop and hope it helps them. :062:

Offline Mikeyh66

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Re: cbf1000 misfire low revs
« Reply #6 on: 28 July, 2019, 11:17:50 AM »
Just an update on the problem. Bike shop had it for 2 weeks and couldnt find the problem (no charge fair play) so another shop checking it and been there nearly 3 weeks and still cannot sort it. Great over 5000 rpm but wont idle or run tidy below that. Starting to give up now. :232:

Offline raYzerman

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Re: cbf1000 misfire low revs
« Reply #7 on: 28 July, 2019, 01:16:38 PM »
If it's been sitting, may have a little water in the fuel, especially if it has ethanol (phase separation).  In any event dump in a few ounces of Seafoam or isopropanol, which will take care of way more water than ethanol.  But a couple ounces of water in the fuel that sank to the bottom can cause your symptoms. 
YOu can check charging voltage to rule out the stator.

Offline Mikeyh66

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Re: cbf1000 misfire low revs
« Reply #8 on: 26 October, 2019, 11:02:15 AM »
Well just an update for anyone with the same problem. As i said 2nd bike shop couldnt solve problem so decided to bite the bullet and had Thunderroad Honda Cwmbran pick bike up (£75 hr). Informed me having problems finding the fault but had CBF1000 courtesy bike and were taking bits off that and trying one by one. Nothing showing on diagnostics. Rang me saying fault found and it was the Throttle position sensor. Honda dont sell these on its own they come as part of throttle bodies which are £1100. Parts guy told me that they can get one off e-bay for £60. So bike back running perfect but it has cost me in total nearly £800 to get done. :172:.

 


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