Rear cylinder spark plug rusty
Thread Starter
|
Intermediate
Joined: Mar 2011
Posts: 39
Likes: 0
From: Southeast Il.
Rear cylinder spark plug rusty
Curious if this is a symptom of anything? Rear spark plug is all rusted on the outside, bike seems to run fine and that plug is still firing. I blow dry the whole bike after a wash, and it may be ridden in the rain when I have to, but garage parked. Its on a 2010 Ultra Limited. Thanks in advance.
Outstanding HDF Member
Joined: Mar 2009
Posts: 2,216
Likes: 102
From: Central Illinois
Probably gets a lot hotter at the rear cylinder so the basically untreated bare metal surface of the spark plug rusts easier. I would guess the air in your area has more moisture in it.
Extreme HDF Member
Joined: Sep 2010
Posts: 14,744
Likes: 402
From: Phoenix '53, '88, '09 Big Twins
probably just water sitting in the hole-
2.) don't forget to put anti seize on the threads when reinstalling and ALWAYS start the plug by hand or with a piece of fuel line hose stuck over the end. using a socket wrench it's too easy to cross thread which is expensive, use the wrench to snug up after finger tightening
and never crank the motor with the plugs disconnected from the spark plug wires and the plugs grounded to the motor or chassis.
Mike
2.) don't forget to put anti seize on the threads when reinstalling and ALWAYS start the plug by hand or with a piece of fuel line hose stuck over the end. using a socket wrench it's too easy to cross thread which is expensive, use the wrench to snug up after finger tightening
and never crank the motor with the plugs disconnected from the spark plug wires and the plugs grounded to the motor or chassis.
Mike
Tourer
Joined: Jul 2009
Posts: 490
Likes: 1
From: Omaha, NE
I use to have the same situation with outboard motors used in salt water. The outside corrosion never impacted the performance of the plug. Use to clean up the plugs every couple weeks and they worked fine. Also, as already stated, use antiseize on the plug threads and if the plug does not screw in and tighten down by fingers to the gasket, something is wrong with the threads.
Advanced
Joined: May 2011
Posts: 61
Likes: 0
From: Mi
I've done this on my '05 FLHTCI after I did the 95" w/ cams & reworked heads, etc, to be sure I was gettin' oil to the rockers before puttin' them on....had the plugs out of the engine & wires, & cranked it over long enuff to see oil....NEVER had a problem....so what gives????
Trending Topics
Thread Starter
|
Intermediate
Joined: Mar 2011
Posts: 39
Likes: 0
From: Southeast Il.
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Verdad Gallardo
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Tourer
Joined: Jan 2016
Posts: 338
Likes: 23
From: Wisconsin
Replace your plugs more often maybe. Clean it up before replacing the plugs, otherwise it won't stop. I haven't had this issue on my bikes. I do replace mine often with the OEM plugs though.