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Author Topic: Front cylinder colder than rear ????  (Read 1023 times)

spit051261

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Re: Front cylinder colder than rear ????
« Reply #10 on: January 08, 2018, 01:24:27 PM »

Is everything tight ?
Have you checked both exhaust pipes and the mica sleeves are both OK and not leaking from the cylinders ?
Seriously , you don't have any nuts, bolts or washers left over ?
You'll have to check the intake on the dodgy cylinder . You could do it with propane but that sounds dodgy . Plenty of guides on YouTube how to do it  :o
It is definitely a fuel / air problem or at least that is how it sounds to me .
If it was working before , it has to be something you have done or not done .
Good luck and hope you find it . Hope you post back to us and let us know  :)
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Sid

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Re: Front cylinder colder than rear ????
« Reply #11 on: January 08, 2018, 01:24:44 PM »

I suppose we need to give the guy the benefit of the doubt at this time.. ;)

What annoys me is when people join a forum to specifically get help, they get the help, don't update the thread and then bugger off never to be seen again. Some giving would be good, as well as just taking imo.
(I'm not saying this guy is like that btw..)
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spit051261

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Re: Front cylinder colder than rear ????
« Reply #12 on: January 08, 2018, 01:28:13 PM »

I suppose we need to give the guy the benefit of the doubt at this time.. ;)

What annoys me is when people join a forum to specifically get help, they get the help, don't update the thread and then bugger off never to be seen again. Some giving would be good, as well as just taking imo.
(I'm not saying this guy is like that btw..)
We will see .
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albertinhouston

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Re: Front cylinder colder than rear ????
« Reply #13 on: January 08, 2018, 01:52:07 PM »

If it wasn't an EFI , I would say timing issue .

 FI doesn't correct timing issues.
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spit051261

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Re: Front cylinder colder than rear ????
« Reply #14 on: January 08, 2018, 11:07:06 PM »

Are you saying it could be a timing issue Albert ?
I just thought it would be easier to knock the timing out on a carby model more so than an EFI after an engine strip down .
« Last Edit: January 08, 2018, 11:37:28 PM by spit051261 »
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umop-ǝpisdn

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Re: Front cylinder colder than rear ????
« Reply #15 on: January 09, 2018, 12:26:15 AM »

I'd like to know more about the colour of the spark.
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Rjbez

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Re: Front cylinder colder than rear ????
« Reply #16 on: January 09, 2018, 12:28:23 AM »

If it wasn't an EFI , I would say timing issue .
How about an intake leak , exhaust leak or even U/S valve on that cylinder ?
You sound like a mechanic who has taken the engine apart for a customer and is now scratching his head  ;)

Haha yeah nah, my own bike! Was too stubborn to take it to a mechanic for the sake of a $20 gear cog ! So decided Iíd be better off pulling it apart myself
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Rjbez

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Re: Front cylinder colder than rear ????
« Reply #17 on: January 09, 2018, 12:40:27 AM »

Both spark plugs have spark when grounded. And have a good 4-6mm of spark from plug. Spark was blue colour remembering off the top of my head.. I did swap the coils around and after doing that the front did start working better than it had.. compression for both cylinders sitting around 110psi

Injectors seem to work as per. Exhaust is sealed well. All air noises can be heard around the  bottom right of the air box area where the hoses plug onto.

Just a stray thought.. if the timing on the rear cylinder is out would that potentially effect the front? ( I did initially miss the timing on the front by a couple degrees but havenít checked the rear as it seems to be working as it should from my experience.. )
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umop-ǝpisdn

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Re: Front cylinder colder than rear ????
« Reply #18 on: January 09, 2018, 01:54:01 AM »

Rjbez,

If either the front or the rear valve timing was out, even by a few degrees, then I would imagine that pistons and valves would be trying their best to inhabit the same area of physical space.

Regarding swapping the coils and the front seeming to work better. I suggest that there might be something spark relates going on.

Start at the spark plug end and work backwards. Spark plugs, the spark plug rubber boot things (these are notorious for cracking and leaking spark), the high voltage leads (make sure they haven't rubbed against something and worn through). All of these things are common points of failure. Even the ignition coils themselves are notoriously shit.

What year model is your bike?

Spit has suggested that their might be an air leak. There's merit to this idea also and it's really easy to test. All you need is a can of Aerostart (or any other brand of ether spray). Start the bike and let it settle into a stable idle. Once you have a regular idle rhythm, spray strategically at all the rubber manifold/throttle body parts. Be methodical. You're listening for a change in idle rhythm. If it changes, then you have a vacuum leak. Try and pinpoint it.
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Rjbez

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Re: Front cylinder colder than rear ????
« Reply #19 on: January 09, 2018, 04:33:43 AM »

Thanks for that. Iíll give it a go tomorrow when I can get back to the bike. Itís 2013 gt650r LAMS approved version (NZ)
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