Anyone else foul out spark plugs?

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Bryan468
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Anyone else foul out spark plugs?

Post by Bryan468 » Wed Jun 12, 2019 11:40 pm


I have just over 1200 miles on the bike and I went to start it today and it started and idled lower than normal... roughly 1k rpms and it just stayed there. I figured it would come out of it and be fine but it didn’t. I also noticed that the afr was at about 10.0!

I tried revving it up and holding it up in the rpms but it started running on 3 cylinders and when I let off it died. Tried it a couple times and got the same result. I disconnected the battery and tried it again a few times and same result.

I’m at about a half tank of fuel and I haven’t filled it recently so I know that’s not the problem. I decided to pull the plugs and it appears they’re in pretty tough shape! I’ve done a handful of pulls with it lately so I’m surprised at how black they are.

I know the owners manual calls for a NGK SILMAR9E9 but I’m curious if anyone has tried a different plug yet?

Is this a common problem with this bike?

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Raddy47
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Re: Anyone else foul out spark plugs?

Post by Raddy47 » Wed Jun 12, 2019 11:45 pm


Did you get a proper tune done after doing the flash and other upgrades?
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Re: Anyone else foul out spark plugs?

Post by Bryan468 » Thu Jun 13, 2019 12:01 am


I did all of the performance mods around 500 miles and I did the vcyclenut flash at the same time.
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Re: Anyone else foul out spark plugs?

Post by Bryan468 » Thu Jun 13, 2019 12:09 am


The only other thing I can think that could potentially be causing this is when I got the ecu back I didn’t fully read the instructions and I touched the throttle instead of leaving it alone to reset the tps. I did unplug the battery and go through the process of resetting the tps but I don’t know if that’s something that can only be done after the ecu is flashed or if you can do it at any point.
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Prof J
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Re: Anyone else foul out spark plugs?

Post by Prof J » Thu Jun 13, 2019 12:12 am


Bryan468 wrote:
Wed Jun 12, 2019 11:40 pm
I have just over 1200 miles
I know the owners manual calls for a NGK SILMAR9E9 but I’m curious if anyone has tried a different plug yet?

Is this a common problem with this bike?

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Bryan468, Got it. Custom map.

10 AFR, from my experience, is pretty wet/rich. I use to run 9 to 10 on my turbo'ed 14 to help make sure no detonation, along with about -6 deg timing.

Yeah those plugs look poor. Have you replaced them yet? Running better with the replacement?
Last edited by Prof J on Thu Jun 13, 2019 12:28 am, edited 1 time in total.
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Re: Anyone else foul out spark plugs?

Post by Bryan468 » Thu Jun 13, 2019 12:18 am


Prof J wrote:
Thu Jun 13, 2019 12:12 am
Bryan468 wrote:
Wed Jun 12, 2019 11:40 pm
I have just over 1200 miles
I know the owners manual calls for a NGK SILMAR9E9 but I’m curious if anyone has tried a different plug yet?

Is this a common problem with this bike?

Image

Image
Bryan468, Got it. Custom map.

10 AFR, from my experience, is pretty wet/rich. I use to run 9 to 10 on my turbo'ed 14 to help make sure no detonation, along with about -6 deg timing.

Yeah those plugs look poor. Have you replaced them yet? Running better with the replacement? I'd talk to the map creator.
It doesn’t normally idle that rich. my guess is it was just idling rich because a plug or multiple were fouled out. I just pulled the plugs... looks like I’ll be waiting for a week for new ones. No one around here stocks them.

I also had a turbo zx14... ran 10psi of boost and I never had to run it that rich. I had low compression pistons and water meth though too.
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Pair valve delete
Tial blow off valve
Zx10 revalved steering damper
1/2” bar risers

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Prof J
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Re: Anyone else foul out spark plugs?

Post by Prof J » Thu Jun 13, 2019 12:25 am


Well, depending, the TPS could be reading/set at a higher/more open from what was intended. Are you able to read your map and compare from when you first got it, before it went into practice?

If you have the software to read your ECU and the various maps, you can change the TPS setting, but if this type of mapping is new to you, I'd probably hit up the vendor. If you have the software to flash, and can get an OEM map from someone, that might work, as well.

My first choice, though, would be to talk to the vendor/specialist.
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Re: Anyone else foul out spark plugs?

Post by Prof J » Thu Jun 13, 2019 12:30 am


Bryan468 wrote:
Thu Jun 13, 2019 12:18 am

It doesn’t normally idle that rich. my guess is it was just idling rich because a plug or multiple were fouled out. I just pulled the plugs... looks like I’ll be waiting for a week for new ones. No one around here stocks them.

I also had a turbo zx14... ran 10psi of boost and I never had to run it that rich. I had low compression pistons and water meth though too.
Yes, you went the better route and had the engine work done.

Can you clean the plugs off, or they are toast?
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Re: Anyone else foul out spark plugs?

Post by Bryan468 » Thu Jun 13, 2019 12:43 am


Prof J wrote:
Thu Jun 13, 2019 12:30 am
Bryan468 wrote:
Thu Jun 13, 2019 12:18 am

It doesn’t normally idle that rich. my guess is it was just idling rich because a plug or multiple were fouled out. I just pulled the plugs... looks like I’ll be waiting for a week for new ones. No one around here stocks them.

I also had a turbo zx14... ran 10psi of boost and I never had to run it that rich. I had low compression pistons and water meth though too.
Yes, you went the better route and had the engine work done.

Can you clean the plugs off, or they are toast?
Oh I could attempt to clean them but it’s a bit of a job so idk if I really want to do it all over again if it doesn’t work! Lol

I also noticed the service manual recommends a plug gap of .031-.035 which seems a bit wide to me. Usually on boosted stuff I stick to around .020-.025.
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Vcyclenut zx10 header/full exhaust
Vcyclenut flash
Sprint filter
Pair valve delete
Tial blow off valve
Zx10 revalved steering damper
1/2” bar risers

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Prof J
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Re: Anyone else foul out spark plugs?

Post by Prof J » Thu Jun 13, 2019 12:59 am


I'm glad you put up your question here. It will be interesting to see if anyone else has encountered this issue.

My bike was delivered yesterday. I'm waiting on lowering links, and other things before I get out on it. It's just that little bit too high, as was the ZX-14, that I had to lower it.
Last edited by Prof J on Thu Jun 13, 2019 9:24 pm, edited 2 times in total.
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