MAVROS

HI all,

Just wondering if anyone has experienced failure of the YS ignition plug after only 10 flights.
My 175z cdi refused to rev at high throttle .....misfiring and not making power throttle back and run good below 3/4 throtle

Removed the ignition plug and noticed the top part detached from the main body.........this is the second time first plug 20 flights and second 10 flights

The plugs were both new and genuine YS parts.

Just wondering if a bad batch worked themselves into circulation or something else is causing these failures


regards

drac1

My Feedback: (4)

I've never had a plug break. I usually get around 120-150 flights from a plug.

Are you sure the plug was causing the misfire and not something else, (sensor?), which resulted in the plug breaking?

MAVROS

I am fairly sure its the plug.

I replaced it with an older plug and no problem.... see how it goes

rgds

drac1

My Feedback: (4)

What do you set the plug gap at? I find that a tight gap works best. I set it at 10 thou, which is less than the specs say.

MAVROS

Hi Drac,

Plug is set at 0.3 mm

rgds

drac1

My Feedback: (4)

Yeah that's 12 thou, which is on the bottom of the range. Should be OK but if you have misfiring, it would be worth going to 10 thou, (0.25mm) and see how it goes.

rcpattern

My Feedback: (45)

Make sure that you support the plug wire to the intake. If you don't, it can put extra stress on the plug. Once I started tying off the ignition wire, many of those problems went away.

Arch

drac1

My Feedback: (4)

I don't support the lead in any way, just use the grub screw in the head to lock it.

apereira

I did had a plug failure with less than 20 flights I think.

Regards

MAVROS

Thanks all,

This is what happened after only 10 flights and yes I do tie the cable with zip tie

rgds

drac1

My Feedback: (4)

Hmm, that's interesting.

I've been using CDI's for around 5 years from the 170 to the 185 with hundreds of flights and never had that happen. I only use the YS plug.

apereira

Mavros,

That is a manufacturing problem, typical to any plug, it is not engine related.

Regards

MAVROS

I think you are correct apareira it does look like a factory problem that maybe YAMADA are not aware of.
Its the second failure that I had with the YS plug.

rgds

Mavros

apereira

He changed the provider I think, as with the new plug it does not happens, on mine the anode was also loose (rotate), on the new ones I have heard of any problems, the have to ridges in the ceramic.

Regards