Correct Idle RPM?

Reply Subscribe

Thread Tools

Search this Thread

Apr 21, 2011 | 08:32 AM

shifflettmc

Thread Starter

Novice

Joined: May 2010

Posts: 21

Likes: 0

Correct Idle RPM?

I have a 95 FLHTP that has been worked to a 103". The previous owner had the idle speed set to what seems very low. (around 400-500 RPM) I get a pretty nasty tapping sound coming from the front cylinder at long lights or when stopped in traffic. I assume this is due to oil flow issues at that low RPM. I goes away after a few minutes once I get back on the throttle. I know I had to keep the old sporty that I had around 1k for the oil pump to work, are the larger EVO's the same way?

So long version made short: What idle RPM should I be running?

Apr 21, 2011 | 08:39 AM

grbrown

Club Member

Joined: Jun 2007

Posts: 45,429

Likes: 2,898

From: Bedford UK

You're quite right, I think the number is 950rpm, but who can get it that precise?! 1k will be just right. Another reason for keeping engine speed up at tick-over is that the crankshaft is accelerated by each cylinder as it fires, then slows as the next one comes up to compression, then accelerates again, etc. Running slow accentuates that and is not good for the crank or other components. Shovels would tolerate a slow tickover, but they have a heavier crankshaft, like a barn engine!

Apr 21, 2011 | 08:59 AM

twistr

Road Warrior

Joined: Jun 2008

Posts: 1,759

Likes: 153

From: On a Large Sandbar, NY

If memory serves correct...1000 rpm +/- 100...

Apr 21, 2011 | 09:04 AM

2006FLST

Road Master

Joined: May 2009

Posts: 1,232

Likes: 8

From: Powder Springs, GA

I always run about 1000. Never been a fan of low idles. Plus you can turn off the choke quicker when warming it up. There is just nothing good that can come from a 500 rpm idle.