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Question about spark plugs (Read 126 times)

Dave

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Re: Question about spark plugs
Reply #15 - 10/14/14 at 17:36:46

Back in the day we also had lead in the fuel.....and that may have also contributed to the fouling.

I suggest you put in a good plug, and run it for a bit, and take it out while it is still running good and see what the plug looks like.

It could be that your electrical system is crappy, and the plug only reflects the fact that when the system is breaking down and not making spark, the cylinder is dumping a bunch of fuel on the plug when it doesn't fire. The plug may not be the cause.

Someday I will be old......But not today!

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Dane Allen Serious Thumper Offline Carpe Diem!! Posts: 1217 Riverside, CA Gender:	Re: Question about spark plugs Reply #16 - 10/14/14 at 17:49:52 Not to hijack a thread but I just passed 21,000 miles and am still on the original plug, does that mean my engine is running cleaner or is it a luck thing?
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Kris01 Serious Thumper Offline Eat, sleep, RIDE! Posts: 3767 Tennessee Gender:	Re: Question about spark plugs Reply #17 - 10/14/14 at 18:07:44 A copper plug will last 30K or more.
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Steve H

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Re: Question about spark plugs
Reply #18 - 10/15/14 at 20:40:58

Update:

The plug was dead. It wouldn't fire on anything I connected it to. New plug wouldn't fire on the dirt bike but would on everything else.

Swapped out CDI. Started first easy kick.

I ordered a spare. Something like $5.49 with free shipping.

I saw a post on a site about chinese 4-wheelers where a guy that sold and serviced them said there is a 30 to 40 percent CDI failure rate within the first year. He generally had 10% failure straight out of the box.

Guess they are using lots of marginal components to make them cheaper.

Thanks for the help and ideas, everyone.

I do think I might order a coil too. If it kills it again, change them both at the same time.

87 LS650, 2005 Ninja 250, 2009 Yamaha C3, 2001 Honda Reflex. On 2 wheels since 6/80.

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Dave YaBB Moderator ModSquad Offline SuzukiSavage.com Rocks! Posts: 18099 Camp Springs, Kentucky Gender:	Re: Question about spark plugs Reply #19 - 10/16/14 at 04:50:07 If the thing remains troublesome.....is the thing a close enough copy of the Honda engines that you could install the parts from a real Honda engine? I just can't imagine that a $ 5.49 CDI is built very well.
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Dane Allen Serious Thumper Offline Carpe Diem!! Posts: 1217 Riverside, CA Gender:	Re: Question about spark plugs Reply #20 - 10/16/14 at 15:27:16 Dave wrote on 10/16/14 at 04:50:07: If the thing remains troublesome.....is the thing a close enough copy of the Honda engines that you could install the parts from a real Honda engine? I just can't imagine that a $ 5.49 CDI is built very well. Nothing Chinese is built very well
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Steve H

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Re: Question about spark plugs
Reply #21 - 10/16/14 at 15:49:04

It's a very close copy. But, you know. Half a mm here and there and things don't fit.

It started and ran about 3 minutes today then stopped. No spark. Not a bad plug. Plug is slightly sooty but the bike was choked for about half the time it ran. Changed the CDI for the new one in the box, still no spark. Checked outputs from the engine. They look good. Stator and pulser. checked continuity of other wires. Disconnected kill switch.

Everything fine. Looks like I'll be sourcing a coil tomorrow. That's the only thing I don't have a replacement for and I am sure one of my spare goldwing coils won't work on it. They are huge compared to the one it has.

87 LS650, 2005 Ninja 250, 2009 Yamaha C3, 2001 Honda Reflex. On 2 wheels since 6/80.

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