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Author Topic: Misfire  (Read 1007 times)

Cloud

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Re: Misfire
« Reply #10 on: November 01, 2017, 03:32:39 AM »


It's not water in there. Even if some got in, the heads get so hot that any water would be boiled off in minutes.

I'm gonna have the tank off on Thursday to see what's what under there.
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Cloud

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Re: Misfire
« Reply #11 on: November 02, 2017, 08:26:37 PM »



"...and as I walk through the Valley of the Shadow of Death, I will fear no evil."

 - - Psalms 23:4


I'm gonna have the tank off on Thursday to see what's what under there.


So everything seems fine with the coils. No evidence of loose wiring or disturbance from flood or impact.



*

So while checking HT leads, because I didn't want it to be the TCI engine spark control box, I decided to pull the spark plugs. The rear plug was hard to unscrew, I figured because it was still a bit hot. When it came out, it had this weird residue on it, like an oily sludge.



*

Spark tip looks shit too.



*

Worst of all, this is a photo down my spark plug hole.

WHAT MANNER OF THINGS?!



*

I'm gonna take the cylinder head off tomorrow.

Worst thing is, I don't even think this is the misfiring problem, which I think is still electrical.

Possibly it's time to let someone else be the fastest four-stroke 125er in the country, and put this one to death.

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albertinhouston

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Re: Misfire
« Reply #12 on: November 03, 2017, 02:25:16 AM »

Ur going to have to replace them anyway. Throw a set of new plugs in and see what happens.
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Cloud

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Re: Misfire
« Reply #13 on: November 04, 2017, 12:38:58 AM »


I'm gonna have the tank off on Thursday to see what's what under there.

- happened

I'm gonna take the cylinder head off tomorrow.

- happened.

*

Hopefully I can make it three in a row.

I'm gonna accept an offer from someone who will buy me a replacement bike tomorrow.
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albertinhouston

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Re: Misfire
« Reply #14 on: November 04, 2017, 03:55:55 AM »

Thats a win win win right there
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Cloud

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Re: Misfire
« Reply #15 on: November 04, 2017, 06:49:07 PM »


Naebdy offered me anyhing today.

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umop-ǝpisdn

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Re: Misfire
« Reply #16 on: November 04, 2017, 09:15:10 PM »

Could the crud not simply be oil rings?

Also with the electrical fault, have you checked where the earth strap attaches to the engine?
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Cloud

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Re: Misfire
« Reply #17 on: November 04, 2017, 09:53:02 PM »


Piston wall and rings are in outstanding condition considering I've abused the living shet outta the bike for over three years. There's no play or slack in the gudgeon pin, conrods, or big end. All tight as a drum. Piston crown, cylinder head, and valve bases, are all layer caked in gritty carbon stuff.

When I got this engine in 2013, I put all of my attention to the front cylinder, because of the shattered piston and destroyed valves. It got all new specialist titanium hollowcore valves, and I did the stem seals as well. The rear didn't get much more than the valve clearances checked, and has always been the noisier of the two pistons, earlier this year leading to me boxresting the bike for several months to investigate clanking from the rear, which I never did do, because I feared it was big end bearing. So possibly this is legacy upshit from before I even got the engine.

It'll definitely need a clean and de-carbon. Finances will decide whether it needs new stem seals too. I'd need to buy a valve spring compressor tool to do the job. Right now I just need to save up for new gaskets. Than I can go back to hunting for the misfire issue.

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albertinhouston

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Re: Misfire
« Reply #18 on: November 05, 2017, 04:56:28 AM »

Do u have over size pistons?
 Would the gasket  have to be custom made if u do?
« Last Edit: November 05, 2017, 04:12:59 PM by albertinhouston »
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Cloud

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Re: Misfire
« Reply #19 on: November 06, 2017, 04:09:03 PM »


Standard size pistons, standard gaskets. I'm just very poor still.
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