Author Topic: Backfiring and smell of fuel from exhaust  (Read 11968 times)

Online Brookester

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Re: Backfiring and smell of fuel from exhaust
« Reply #25 on: May 21, 2018, 05:05:28 PM »
Could it be the spark plug lead is cracked causing it to short out...once had that problem on the FJR???
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Re: Backfiring and smell of fuel from exhaust
« Reply #26 on: May 21, 2018, 05:40:11 PM »
Thanks again guys
 I'm putting the bike back together for now and am going to call it a day as I have to start getting everything ready for work tomorrow ( I start very early in the morning and need to catch up on sleep) and make/eat dinner of course.

I'll keep going on all the suggestions when I have a chance.

Thank you again everyone I really appreciate all the effort, thought and suggestions.

If you think of any other suggestions please post them and I will give that a shot as well :thumbs

Cheers
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Offline Gadget

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Re: Backfiring and smell of fuel from exhaust
« Reply #27 on: May 21, 2018, 07:16:09 PM »
When the engine is cold  start up the motor and when running at idle speed then check the individual exhaust pipes for heat, use your finger , but be careful to not get burnt. One pipe that is colder to the others will indicate that its associated cylinder has a problem,It is my guess that the problem will then be either fuel, or spark related ,Over to you how you then solve that problem .
Cheers, Winston66, Northampton WA.
Shiney,

I have an infrared thermometer you can borrow.

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Re: Backfiring and smell of fuel from exhaust
« Reply #28 on: May 21, 2018, 07:42:43 PM »
Thanks mate :hatwave
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Offline Biggles

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Re: Backfiring and smell of fuel from exhaust
« Reply #29 on: May 22, 2018, 01:04:41 AM »
I can't see valves mentioned above, but could it be a sticking or badly seating valve?
That would show up on a compression test, I suppose.
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Re: Backfiring and smell of fuel from exhaust
« Reply #30 on: May 26, 2018, 12:38:11 PM »
Ok, here is the latest update.
I felt the heat of the pipes where it comes out of the motor and have felt no change between any of them.
 I have switched the spark plugs and coil from left to right with no change (still backfiring out of the left exhaust only)

This leaves a badly seeded or sticky valve as being the final suggestion however I have no idea how to check this.

 Does anyone know how I could go about checking this?


The only other thing that has been changed recently on the bike is the addition of the electronic cruise control.

To make sure that this wasn't the cause of the backfiring I disconnected power to the cruise control to see if it was some sort of power issue however there was no change after doing this.

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Re: Backfiring and smell of fuel from exhaust
« Reply #31 on: May 26, 2018, 12:47:30 PM »
If you get no response Shiney it might be time to get it to a mechanic to delve in a bit further  :thumb
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Re: Backfiring and smell of fuel from exhaust
« Reply #32 on: May 26, 2018, 12:51:41 PM »
If you get no response Shiney it might be time to get it to a mechanic to delve in a bit further  :thumb

That's is the plan, if I can't get it running properly over the weekend (all the mechanics are shut on the weekend :fp)

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Re: Backfiring and smell of fuel from exhaust
« Reply #33 on: May 26, 2018, 01:10:28 PM »
Big place like Brisbane doesn't have a mobile bike mechanic?
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Offline winston66

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Re: Backfiring and smell of fuel from exhaust
« Reply #34 on: May 26, 2018, 02:31:09 PM »
The next thing that I would try is to obtain a compression tester and then check each cylinder in turn and note any differences in pressures.
This will show if there is any differences in cylinder pressures due to a degraded valve,
Otherwise if no out of spec difference in pressures then I will still suspect a problem with a fuel injector supplying excess fuel to one cylinder.
Cheers,
Winston66, Northampton WA.
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Re: Backfiring and smell of fuel from exhaust
« Reply #35 on: May 26, 2018, 02:44:26 PM »
The next thing that I would try is to obtain a compression tester and then check each cylinder in turn and note any differences in pressures.
This will show if there is any differences in cylinder pressures due to a degraded valve,
Otherwise if no out of spec difference in pressures then I will still suspect a problem with a fuel injector supplying excess fuel to one cylinder.
Cheers,
Winston66, Northampton WA.

Thanks mate,
I will go out and buy a compression tester tomorrow :thumbsup

Cheers
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Re: Backfiring and smell of fuel from exhaust
« Reply #36 on: May 27, 2018, 03:26:03 PM »
Well guys I believe it must be the valve.

The left side is a lot lower than the right

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Re: Backfiring and smell of fuel from exhaust
« Reply #37 on: May 27, 2018, 06:52:16 PM »
Time to do a valve clearance check Brother Shiney🤓
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Re: Backfiring and smell of fuel from exhaust
« Reply #38 on: May 27, 2018, 09:07:54 PM »
For those that 'have a clue', is it unusual that both LH side cylinders are low on compression? Why would that be? 
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Re: Backfiring and smell of fuel from exhaust
« Reply #39 on: May 28, 2018, 09:38:15 AM »
Its most unusual to have any problem with any cylinders, 11 or 1300.

The left valve shims may be a little to thick, or they may not have been seated correctly. It is a situation that I cant recall before.
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Offline Biggles

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Re: Backfiring and smell of fuel from exhaust
« Reply #40 on: May 28, 2018, 01:04:49 PM »
Well guys I believe it must be the valve.

I humbly refer you to Reply #29 on: May 22, 2018, 01:04:41 AM    :grin
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Re: Backfiring and smell of fuel from exhaust
« Reply #41 on: May 28, 2018, 04:56:39 PM »
Well guys I believe it must be the valve.

I humbly refer you to Reply #29 on: May 22, 2018, 01:04:41 AM    :grin

Reply #29
     
      I can't see valves mentioned above, but could it be a sticking or badly seating valve?
      That would show up on a compression test, I suppose.
     


That is the post that led me to doing the compression test :thumbsup
Thanks mate :-++
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Re: Backfiring and smell of fuel from exhaust
« Reply #42 on: May 28, 2018, 05:39:34 PM »
 :think1 So if you add some Selleys no more leaks to the fuel it should stop the valve sticking or leaking  :whistle :whistle :grin :grin
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Re: Backfiring and smell of fuel from exhaust
« Reply #43 on: May 28, 2018, 10:16:55 PM »
:think1 So if you add some Selleys no more leaks to the fuel it should stop the valve sticking or leaking  :whistle :whistle :grin :grin


I think you ment...

 :think1 So if you add some Selleys no more leaks to the fuel it should stop the valve sticking or leaking  :whistle :whistle :grin :grin   bike  :eek :eek


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Offline Biggles

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Re: Backfiring and smell of fuel from exhaust
« Reply #44 on: May 28, 2018, 11:01:01 PM »

I think you ment...

 :think1 So if you add some Selleys no more leaks to the fuel it should stop the valve sticking or leaking  :whistle :whistle :grin :grin   bike  :eek :eek

anyhow, the valves won't stick...     :whistle
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Offline StinkyPete

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Re: Backfiring and smell of fuel from exhaust
« Reply #45 on: May 29, 2018, 06:55:36 AM »
Incorrect valve clearance seems like a most unexpected problem.   My 13 has 176k on the dial, has had the clearances checked on schedule every time, and they have never needed adjusting.
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Re: Backfiring and smell of fuel from exhaust
« Reply #46 on: May 29, 2018, 08:53:14 AM »
:think1 So if you add some Selleys no more leaks to the fuel it should stop the valve sticking or leaking  :whistle :whistle :grin :grin


I think you ment...

 :think1 So if you add some Selleys no more leaks to the fuel it should stop the valve sticking or leaking  :whistle :whistle :grin :grin   bike  :eek :eek
See - problem Solved  ;-* :grin
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Re: Backfiring and smell of fuel from exhaust
« Reply #47 on: May 29, 2018, 08:54:50 AM »
Incorrect valve clearance seems like a most unexpected problem.   My 13 has 176k on the dial, has had the clearances checked on schedule every time, and they have never needed adjusting.
I agree Pete - Shineys bike is fairly new so I am still thinking injector problem  :wink1
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Offline tding

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Re: Backfiring and smell of fuel from exhaust
« Reply #48 on: May 29, 2018, 10:28:55 AM »
When you say backfiring do you mean popping back through the air cleaner or popping crackling out the exhaust?
The pipe at the back of the air box that you blocked is the air injection, witchI believe feeds fresh air into the exhaust ports thru a pair of reed valves in the head and is controlled by the large valve just behind the airbox.
The crankcase breather goes to the front right corner of the airbox.
If too much air is being bled into the exhaust it will mess with the O2 sensors cursing a over rich situation.
Also check for leaks in the exhaust system.
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Re: Backfiring and smell of fuel from exhaust
« Reply #49 on: May 29, 2018, 11:51:16 AM »
Makes sense to me
Since fitting Staintune mufflers I get a little crackle from exhaust but a lot of bikes and cars with aftermarket exhausts does it
But not actual backfire
But I don't get a fuel smell
Sometimes sounds good  ++
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