2015 RC80 Intermittent Misfire

[Gairo]

Evening all, first post for a while but I’m after some info if possible, I’ve recently developed an intermittent misfire, I thought initially that it was only happening while cold, turns out I was incorrect, it’s mostly from cold but then I was out for a 200+ mile ride a few weeks ago when coming to a stop at a junction it happened at about 35mph under normal engine assisted braking, it was noticeable to the point that it threw me off balance due to my weight shifting and I was nearly dumped unceremoniously into a hedge at the side of the road !
It’s not happening all that often but it did it again today, I ride to work at 7am, 48 miles and no drama, at work for 5 hours with bike parked inside the building so ambient temperature was around 22 degrees C. Set out to ride home and after less than a mile it happened again, 1 bar on the temp gauge so approaching half normal operating temperature. I now have to counteract it by pulling the clutch lever to disengage drive and holding the revs at around 4K until it passes. It ‘misses’ around 3-5 times in a couple of seconds and I’ve yet to experience it more than once per journey, irrespective of distance and/or ambient temperature but it’s obviously a worry. My 2015 65 plate VFRX has covered nearly 16.5k and is only slightly overdue for its big 16k service, previous servicing has been done by Honda main dealers at first service and 8k while I’ve done oil and filter at 4K and 12k.
I’ve checked battery and cables/terminations so far but not too much else. Has anyone ever experienced this or have any suggestions for what it may be ???
Also, recommendations for 16k service please. Distance within 100 miles of Wolverhampton preferably although I don’t mind travelling further for the right job.

Thanks in advance.

[Lars]

Hello Gairo,

I personally have not experienced a single misfire on my 2015 Crossrunner in 41k km or on my previous Honda ever, not even on my Honda lawnmower.
Take your bike to the dealer for the big 16k check and tell him that there are misfires. 99% of the causes of misfires ( fuel, fire, compression ) are taken care of in the 16k inspection interval IF DONE PROPERLY.
I am 100% with you that you 'll need a "proper" Honda dealer/mechanic who actually takes the engine apart to have it checked thoroughly which is part of the 16k service. Just in case no one mentioned it, its going to be expensive anyways.
I don't have a dealer to recommend to you as I am not in the UK.

Lars

[Haddo]

Have had similar problem with faulty kill switch on other bikes.Have you changed bars or tinkered with wiring?

[Gairo]

Originally Posted by Lars

Hello Gairo,

I personally have not experienced a single misfire on my 2015 Crossrunner in 41k km or on my previous Honda ever, not even on my Honda lawnmower.
Take your bike to the dealer for the big 16k check and tell him that there are misfires. 99% of the causes of misfires ( fuel, fire, compression ) are taken care of in the 16k inspection interval IF DONE PROPERLY.
I am 100% with you that you 'll need a "proper" Honda dealer/mechanic who actually takes the engine apart to have it checked thoroughly which is part of the 16k service. Just in case no one mentioned it, its going to be expensive anyways.
I don't have a dealer to recommend to you as I am not in the UK.

Lars

Thanks Lars 

[Gairo]

Originally Posted by Haddo

Have had similar problem with faulty kill switch on other bikes.Have you changed bars or tinkered with wiring?

Nothing been messed with Haddo, I’ll strip the kill switch down though and have a look

[moey47]

I posted something about starting issues with my bike  a few months ago, although it wasn't misfiring it was gradually getting harder to start, until one day just wouldn't start.I stripped it down to check and found it wasn't getting any spark and without the right testing equipment i couldn't go any further.I got it to a dealer and they diagnosed the crank angle sensor,also known as the pulse generator was faulty.Had to come ex Japan and took over a month to get in,$600 later its fixed and hasn't missed a beat. My bike is a 2011 model I'm sure not much has changed in the engine ,i believe there the same.

[Gairo]

Thanks for that buddy, something else I can throw at them as a possible cause although as of yet I’ve never had a problem with starting, you never know though, it could be linked 

Originally Posted by moey47

I posted something about starting issues with my bike  a few months ago, although it wasn't misfiring it was gradually getting harder to start, until one day just wouldn't start.I stripped it down to check and found it wasn't getting any spark and without the right testing equipment i couldn't go any further.I got it to a dealer and they diagnosed the crank angle sensor,also known as the pulse generator was faulty.Had to come ex Japan and took over a month to get in,$600 later its fixed and hasn't missed a beat. My bike is a 2011 model I'm sure not much has changed in the engine ,i believe there the same.

[moey47]

Good luck with it,I'm sure yull get it sorted, please let us know how you go with it.One other thing my Honda mechanic told me is that Not to use premium unleaded fuel ,just use regular unleaded fuel. He said he's had a lot of engine problems with premium fuel.Apparently over time it eats away at the inner lining of the fuel rails and ends up in your engine.I don't know if that's true or not, but I've stopped using premium fuel, if anyone else has heard the same thing please comment.

[Skids]

Don't know about eating away things, but 98 Ron is unnecessary in the 800 as it does not have a knock sensor so cannot take advantage of it. Honda recommend the lower rated fuel so no need to use higher, however, a good friend of mine who was an engineering consultant at Castrol always said that filling up with premium every 4 or 5 tanks is fine as the extra additives/detergents in it help to keep things clean.

Honda recommend Premium fuel for my VFR1200.

[Haddo]

Dont know about other countries but here in oz we have ron 91 / 95 / 98. I usually use 95ron as suggested by the dealer for australian avalable fuels. I have tried all but think the bike does run better on 95ron. JMO.