Random dead miss.

I get back to the misfire in a few days. Just did the transaxle today; install new needle bearings, input shaft, and drive shaft [forward reverse assy]. Also added grease.

Now that a Honda generator and two Husqvarna chainsaws came in today those got to be checked out for what parts I will for them.
 
Well here's the solution to the random misfire. It was the new Champion spark plug. The customer has installed a new plug while to troubleshoot the carburetor problem. New NGK 2460 installed and its purrs right along with no random misfires.

As we always say new don't always means good.

Now one chainsaw carb was filthy, the other was incorrect plumbing and incorrectly tuned. Now just started on the generator and its carb is a mess.
 
StarTech said:
Well here's the solution to the random misfire. It was the new Champion spark plug. The customer has installed a new plug while to troubleshoot the carburetor problem. New NGK 2460 installed and its purrs right along with no random misfires.

As we always say new don't always means good.

Now one chainsaw carb was filthy, the other was incorrect plumbing and incorrectly tuned. Now just started on the generator and its carb is a mess.
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Nothing will make you pull more hair out then a champion plug. The only plug that used to list a 25% misfire within acceptable range of operation in their spark plug catalog.
 
Mark H_NO said:
Wasn't someone recently saying NGK stands for No Good Kind?
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Wasn't me as nearly all of my plug stock is NGK except I have been switching to Bosch on the CMR series.

Now CMR series I do have a lot problems with. I even had one to cause an engine knock in a 2C back blower. The customer got so mad when I told the cause was only a bad spark plug.

Have even seen a plug ceramic section to be loose in the metal shell? I have one case of that in a chainsaw. So much lost compression it would not even start. That customer argued that wasn't the problem until I handed him the plug.

Have you ever disassembled a spark plug? That's I how I found where the ceramic can develop cracks will causes problems.
 
Have had plugs were you could twirl the ceramic in the metal shell. Also the ceramic is porous and since most plugs are slated more toward EFI systems anymore they no longer have a sealant coating. Therefore the ceramic will absorb gas when you flood the engine, and gas is conductive, therefore leading to gas internally shorted plugs.
 
A little measly spark plug, especially a champion, can really make a guy feel weak upstairs when they have tried ALL the others things FIRST to make it run right and as a last ditch effort, replace the spark plug.

I now usually go to the plug first. (lesson learned and not forgotten)

I keep a container of know bad spark plugs just for show and tell. Most all are champion but I do have one NGK.
 
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