Cold start idle

[steveg]

Hello

When I start my Tiger 800 roadie from cold it idles @ 1000 rpm , used to idle intially from cold @ approx 1200 - 1300 then settle at 1000 rpm when warm

Any ideas ? Stepper seems nice and clean ...

Cheers Steveg

[KildareMan]

What's the idle when warm?

[steveg]

Warm idle is 1000 so fine when warm , does not run well until warm , definitely used to perform a higher cold start idle

[KildareMan]

1000 is low for a warm engine. Should be 1100 to 1200 ish

[steveg]

Originally Posted by KildareMan

1000 is low for a warm engine. Should be 1100 to 1200 ish

Agreed any ideas what might cause a lower idle ?

Cheers

[KildareMan]

The fact that it's low hot and cold makes me think the throttle so screw has loosened off. Which shouldn't happen as there's a lock nut on it.  Worth looking. Not easy to get to though.

[chuckxc]

The warm-up idle transition  from 1400 to 1100 is mechanically controlled by the stepper motor, and that is controlled by the ECU.
Watch the stepper motor under two conditions 1) about 45 sec after you switch off the ignition you should see the stepper motor arm fully extend and then return to normal start position (the 'fax machine sound' )
 Then, 2) when you start the bike cold it should move up slightly and gradually move back. That may give you an idea.

[steveg]

Thanks for the replies
I always start bike and ride off straight away
This morning left to idle from cold for a minute and idle did creep up to approx 1200 rpm , however after riding off idle back to 1000 rpm
Feels stepper motor ish

Cheers Steve

[KildareMan]

Remember that the "problem" area is not the stepper motor shaft, rather the roller at the top.  A good clean then spray with a dry lubricant and you should be good for ages. 

Or remove stepper and fit manual idle adjuster.

[steveg]

Thanks for the replies
Stepper and roller was cleaned and dry lubed  last major service approx 9 months ago
It's due a service soon so will do it again

Manual stepper Def the way forward for gen 1 tigers

Cheers Steve