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-   2008+ KLR650 Wrenching & Mod Questions (https://www.klrforum.com/2008-klr650-wrenching-mod-questions/)
-   -   Idling question (https://www.klrforum.com/2008-klr650-wrenching-mod-questions/59945-idling-question.html)

Sender1 03-07-2017 06:00 PM

Idling question
 
I was wondering what the ideal RPM should be under normal conditions at a sitting idle? I'm just a smidge over 1k and it seems OK but figured I'd ask anyway. Have a 2012 KLR with 4k on her.

Sender1,
design and fabricate

tjtj 03-08-2017 07:54 AM

Quote:

Originally Posted by Sender1 (Post 577177)
I was wondering what the ideal RPM should be under normal conditions at a sitting idle? I'm just a smidge over 1k and it seems OK but figured I'd ask anyway. Have a 2012 KLR with 4k on her.

Sender1,
design and fabricate



Service manual calls for 1300 +/- 100.

Sender1 03-08-2017 08:25 AM

Copy, thanks felt it was ok but seemed like she needed a bit more to drink

Sender1,
design and fabricate

pdwestman 03-08-2017 02:53 PM

1000rpm is OK, if it sounds happy and no flame outs when you start to open the throttle.
Wattman, that sells the Thermo-Bob even drops to 900 rpm to save gas.

One of the issues with too low of idle speed can be voltage drop, so I prefer 1200-1300 rpm. One can see the difference with the headlight shining on a wall. And then the fan kicks on, headlight dims some more!

GoMotor 03-09-2017 12:05 AM

Quote:

Originally Posted by pdwestman (Post 577401)
1000rpm is OK, if it sounds happy and no flame outs when you start to open the throttle.
Wattman, that sells the Thermo-Bob even drops to 900 rpm to save gas.

One of the issues with too low of idle speed can be voltage drop, so I prefer 1200-1300 rpm. One can see the difference with the headlight shining on a wall. And then the fan kicks on, headlight dims some more!

I agree with pdwestman that 1,200 is a good idle.

I like to run my 2011 gen2 at 1,000 just for the way it sounds. I may have to give it a little throttle while I back it out of the garage on cool mornings to keep it running, but once I roll out of the driveway it is fine.

Earlier today answered a riders question about battery drain at idle if he hot wired his radiator fan. I idled mine at 1,000 rpm with the fan on and the low beam headlight on. It was making 14.35 volts before the fan came on and actually went up a little when the fan came on.

I am not sure if there might be an oil pressure problem at low idle, but I have put many tens of thousands of miles on my two gen2s with no problems. pdwestman would know a lot more about oil pressures.

DPelletier 03-09-2017 10:11 AM

Good info, as always, from PD and GoMotor.....good to know there isn't a big battery draw at 1000 rpm's. I idle mine at 1200 over (clearly unfounded) concerns of battery discharge and possible lubrication issues at lower rpms (undoubtably also unfounded!).

Now that I think about it, my bike seldom idles anyhow; if it's cold and I'm warming it up, I have the enricher on and idle is over 1500....I tend to not let it idle long and then get on and ride fairly soon (30 - 60 seconds) in order to get it up to operating temperature more quickly.

I couldn't care less about the fuel I burn whilst idling, myself.

Dave


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