Long Time, no Post - Help needed

[fatharry]

OK, so before anyone says anything, its been a long long time since i've posted on here. Sorry chaps but been caught up with other things 

Anyway to make it worse, is the reason for my resurgence, is basically i need help with the GTR (2009 model). something is not right, but i'm stuffed if i can track it down!

About 4 months ago, i noticed an increase in fuel consumption, my ave had dropped from 44 mpg to roughly 36mpg which is a huge amount, even now on motorway runs i am only managing 42mpg which just ain't right. My concern is something is going on with the engine, but i just can't seem to find the fault

To ensure my numbers are right, i have swapped back the OEM pipe for the last 1000 miles, have had a full service done including valve clearances  (bike now has 25k on the clock) and all HT leads checked... and before any one says anything, nope i have not put on weight 

anecdotally i can now hear the occasional misfire normally in 2nd shortly after i have shifted up from 1st, and there is load on the engine?....and another thing (possibly unrelated), i have replaced 3 tail light bulbs in the last 12 months, although that being said the bike is kept outside under cover and therefore is subjected to reasonably cold night time temps

I have run out of ideas of where to look next?...can anyone offer any thoughts on possible causes/solutions...... i would of course love to take back to local Kwack dealer for diagnostics, but have sadly been redundant and need to watch the pennies, so a DIY solution is preferable before i get striped by the dealer fault finding?

Any advice would be greatly appreciated

[pistole]

- when were your plugs last changed ?

.

[fatharry]

Bout 800 miles ago....problem preceeds new plugs and still continues...

[BigAlan]

This might sound stupid but it worked for me on a car once, wait until dark with the side panels off and run the bike up, if there is any tracking along plug/coil leads you will see it, you won't necessarily see any sparking in daylight, worked for me on a mate's car when we found a coil lead tracking.

Alternatively and I know it might cost try a power commander.

Alan

[viper]

thinking out the box for a minute, have your MPG settings in the display reverted back to US imp gallons, which indicates a much lower mpg

[fatharry]

Big Alan, would love to go the power commander route, but right now too costly - plus I think there is and underlying problem, agree on the ht lead tracking but even with panel off there isn't enough visibility to tell

Viper - clocks checked and set correctly :-).... Fuel light flashes normally around 140

My current thoughts are electrical rather than mechanical, but the misfire worries me when under load

[O.C.]

Hate to say this FH, but could it be something related to the ECU or fuel system DFI, as it appears that the 'misfire' is more noticeable when the bike is under load.

Is the bike idling ok, or is it rough ?

[vfrtom]

May not be of much help, but I had a similar problem on my Honda Blackbird. Transpired it was the Reg/Rectifier on its way out.
Certainly sounds electrical to me
Tom

[fatharry]

To my mind bike idle a little rough, nothing terribly noticeable, but doesn't sound quite right to me

Is there any way to tell? Diagnose? Ecu and/or DFI fault or is a case of the dealer diagnostics

Had thought about reg/rec previously but battery was changed last year and battery holds its charge fine

[virginiajim]

Assuming no engine mods (PCV) or lesser ilk, it might be a stick coil going bad.  We've seen that happen a time or two over here and elsewhere.  Enough so, that I've got 4 off of ebay just in case.  Also picked up a used fuel pump.  It might be trash in the filter but I suspect that your gas mileage might improve with that issue.

[virginiajim]

thinking out the box for a minute, have your MPG settings in the display reverted back to US imp gallons, which indicates a much lower mpg

That happened in my wife's car...she pressed the wrong button and everything changed over to kilometers...

[O.C.]

To my mind bike idle a little rough, nothing terribly noticeable, but doesn't sound quite right to me

Is there any way to tell? Diagnose? Ecu and/or DFI fault or is a case of the dealer diagnostics

Had thought about reg/rec previously but battery was changed last year and battery holds its charge fine

I think its gonna be down to dealer diagnosis FH, which may be a little costly, the low mpg and rough running would, in my book, point to a DFI issue

[fatharry]

Thought so!! Thanks for you help chaps


Pants