Hi All,
Since the Denso X27EPR-U9 spark plug I use for my 914 has a U-shaped electrode gap, I haven't been able to find an appropriate tool to measure that gap.
I want to make sure they're properly gapped.
Best tool?
Thanks!
Hi All,
Since the Denso X27EPR-U9 spark plug I use for my 914 has a U-shaped electrode gap, I haven't been able to find an appropriate tool to measure that gap.
I want to make sure they're properly gapped.
Best tool?
Thanks!
Re: Gap Gauge for Denso X27EPR-U Spark Plug
by Bill Hertzel » 3 years ago
Just use a normal plug feeler gauge.
Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
Clicking the "Thank You" is Always Appreciated by Everyone.
Re: Gap Gauge for Denso X27EPR-U Spark Plug
by Craig E Maiman » 3 years ago
So, a flat blade gauge is fine for a u-channel gap?
Re: Gap Gauge for Denso X27EPR-U Spark Plug
by Bill Hertzel » 3 years ago
Any method of gapping the plug will be fine.
But because you are using a plug that has not been tested and specifically approved, it will be up to YOU to determine what the "Proper" gap should be.
As a Famous Man once said, "Son, You're on Your Own!" ?
Seriously, Let us know how it works
Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
Clicking the "Thank You" is Always Appreciated by Everyone.
Re: Gap Gauge for Denso X27EPR-U Spark Plug
by Craig E Maiman » 3 years ago
What do you mean? It’s the exact spark plug listed in the maintenance manual for the 914. See the attached picture. X27EPR-U9.
I know Rotax specifies their plugs now, but I understood the X.. spark plugs were used for a long time and work fine.
And at 1/10 of the cost of the Rotax plugs…
what am I missing?
Re: Gap Gauge for Denso X27EPR-U Spark Plug
by Bill Hertzel » 3 years ago
You are correct. My apologies.
I was not aware that the 914 has a different plug from all the rest of the 900 series engines.
All the other engines use the now obsoleted NGK plugs or the new dual-electrode Rotax proprietary plug.
As you noted, the X27... plug has long been and still appears to be the specified plug for the 914 engine.
I would gap it using conventional methods.
Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
Clicking the "Thank You" is Always Appreciated by Everyone.
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