On Monday, May 6, 2019 at 4:36:40 PM UTC-4, Wade Garrett wrote:
On 5/6/19 3:06 PM, Terry Coombs wrote:
On 5/6/2019 12:14 PM, Wade Garrett wrote:
Performing routine annual maintenance on my Echo hand-held leaf
blower, I discovered that last spring, I mistakenly installed a spark
plug one heat range hotter than specified. The blower was used plenty
with this wrong plug in it- and the part of the plug inside the engine
had a heavy very light gray deposit on it.

Wonder if that did any permanent engine damage or shortened its life€¦

Â* You haven't hurt it . If you had , you'd know because it would likely
have locked up . Do get the right plug , that light gray deposit , was
it like glass ? Or more like oil deposits that had burned very hot ?

Didn't look glassy at all, just something I've never seen before.

Usually the well-used plugs look tan- or black if it's running rich or
I'd put too much oil in the gas.

--
"Get off of my lawn!"
- Clint Eastwood (as Walt Kowalski in Gran Torino)

It's a hotter plug, so the temp of the plug will be higher, so maybe that
which would have been tan, burned up more and became gray. Like others
have said, I would not worry about it. IMO to harm one of these things,
you have to do something really stupid. Like run it on gas without oil.