Low speed throttle response.

snagger · 08-May-2005, 15:47

Hi, posted this on UK Mon with no response...

'01 M600 when started cold, fires straight up, and seem's to rev hard when on choke, try to back the choke off, the engine then struggles to idle till warm, or rev's high with choke.

Before fully warm the bike has a low speed 'stumble' when pulling away, this is noticable, to a lesser degree when fully warm too.

The bike is totally standard.

Is there any way to fine tune the jetting to eliminate this?
I'm thinking maybe pilot screw's, how many turns out are they as st'd?
Are they a bit rich or lean as st'd?

Any help appreciated.
Regards Phil

Jon · 08-May-2005, 17:43

Not sure if this will work with the monnie 600, but you couold try a smaller front sprocket. This smooths out the jerkyness on the 748/9** series

snagger · 08-May-2005, 22:19

Hi, I've got a smaller sprocket fitted, which as you say help's.

The bike still suffers from a 'stumble' just off throttle tho.

Phil

Jon · 08-May-2005, 22:39

If you can hang on a bit Nelly will be back soon. I'm sure he can help you

snagger · 09-May-2005, 22:20

Ok, Thanx,

Phil

Ducman851 · 11-May-2005, 06:36

You could back the pilots out abit, stumble is usually indicative of a lean condition.

Also, how many miles/kms ?

snagger · 11-May-2005, 19:31

Bike has only done 5500mls, everything is stock.

I was figuring it may be a tad lean by the temperemental cold running.

Do you know how many turns out the pilot screws are as standard?
Just so I have a base to work from (tried one screw, think it was about 3 turns to fully seated)

Thanx, Regards
Phil

psychlist · 11-May-2005, 23:30

You need a stage 2 dynojet kit & hi-flow air filter

The transformation to low speed pick-up is phenomenal

www.spareshack.co.uk

phil_h · 11-May-2005, 23:32

Adjust the pilot screws to 6 turns out IMMEDIATELY !!!
You will def get a smoother running bike, cos the std settings are WAY too lean.

snagger · 12-May-2005, 23:55

Ahem, is that SIX turn's out!!!!
Is there that much threading....

What about the midrange, is there a benefit from lifting the needle's too?

Six turns....

Thanx, Phil

Six turns (recurring)

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08-May-2005, 17:43	#2
Jon Registered Forum User Ducati Corse Posts: 3,921 Join Date: Jun 2001 Location: Drayton Bassett, Staffs Mood: Tad more confident Not sure if this will work with the monnie 600, but you couold try a smaller front sprocket. This smooths out the jerkyness on the 748/9** series Reply

08-May-2005, 22:19	#3
snagger Registered Forum User Posts: 7 Join Date: May 2005 Hi, I've got a smaller sprocket fitted, which as you say help's. The bike still suffers from a 'stumble' just off throttle tho. Phil Reply

08-May-2005, 22:39	#4
Jon Registered Forum User Ducati Corse Posts: 3,921 Join Date: Jun 2001 Location: Drayton Bassett, Staffs Mood: Tad more confident If you can hang on a bit Nelly will be back soon. I'm sure he can help you Reply

09-May-2005, 22:20	#5
snagger Registered Forum User Posts: 7 Join Date: May 2005 Ok, Thanx, Phil Reply

11-May-2005, 06:36	#6
Ducman851 Registered Forum User Montjuic Posts: 77 Join Date: May 2005 Location: Temecula, California, USA Mood: Just Ducky You could back the pilots out abit, stumble is usually indicative of a lean condition. Also, how many miles/kms ? Reply

11-May-2005, 19:31	#7
snagger Registered Forum User Posts: 7 Join Date: May 2005 Bike has only done 5500mls, everything is stock. I was figuring it may be a tad lean by the temperemental cold running. Do you know how many turns out the pilot screws are as standard? Just so I have a base to work from (tried one screw, think it was about 3 turns to fully seated) Thanx, Regards Phil Reply

11-May-2005, 23:30	#8
psychlist Registered Forum User Ducati in my Blood Bikes: Diavel, very non-std black & white ;) Posts: 4,701 Join Date: Aug 2002 Location: Over there Mood: Lucky? For some, maybe! You need a stage 2 dynojet kit & hi-flow air filter The transformation to low speed pick-up is phenomenal www.spareshack.co.uk Reply

11-May-2005, 23:32	#9
phil_h Registered Forum User Ducati Meccanica Posts: 2,527 Join Date: Sep 2004 Location: Pulborough, W. Sussex Mood: 900,900,851,750,750,750, 600,600,450,350,350,250 Adjust the pilot screws to 6 turns out IMMEDIATELY !!! You will def get a smoother running bike, cos the std settings are WAY too lean. Reply

12-May-2005, 23:55	#10
snagger Registered Forum User Posts: 7 Join Date: May 2005 Ahem, is that SIX turn's out!!!! Is there that much threading.... What about the midrange, is there a benefit from lifting the needle's too? Six turns.... Thanx, Phil Six turns (recurring) Reply