Cutting out/bad idle

DeeJay · 09-Sep-2004, 10:38

My 748 sp has started to miss and splutter on tickover. When it's cold this results in it stalling and when warm just alters the idle rate. The bike hasn't been used too much of late but has just had a mini-service (oil, fuel filter etc).

The bike's relatively new (to me) but the power delivery feels very 2-stroke like (i.e weak until 7k rpm when it takes off). I'm not sure whether this is a symptom of the same problem or just a characteristic of the wilder cams on the sp.

Could anyone offer any suggestions as to what this could be or should I be booking it in at the local dealer?

Thanks in advance.
DJ

748mart · 09-Sep-2004, 10:56

Did you change the plugs as part of the service?

DeeJay · 09-Sep-2004, 12:16

Quote:

Originally posted by 748mart
Did you change the plugs as part of the service?

I believe so (I'll check the receipt). I was thinking that the HT leads breaking down could possibly cause this. It could tick over nicely for 20-30 seconds then misses about 5 times in the next 30 seconds so it's not at all predictable.

I actually plan to have it blueprinted and given a 'full monty' service over winter which should sort but just want to have some fun whilst the sun's shining!

D

desmojen · 09-Sep-2004, 12:35

The power band thing is quite normal mate, mines the same!
Have you got the right chip in for your exhaust? Mine was terrible when I got it and that was why, but having said that mine is reminiscent of a bag of nails at tickover too.

DeeJay · 09-Sep-2004, 14:12

Quote:

Originally posted by desmojen
The power band thing is quite normal mate, mines the same!
Have you got the right chip in for your exhaust? Mine was terrible when I got it and that was why, but having said that mine is reminiscent of a bag of nails at tickover too.

I need to check the chip really (or change the exhaust back for a day). Someone mentioned getting it RR'd and mapped correctly so I may do that, but just wanted to make sure I wasn't going to have to spend a fortune sorting this problem out first

Is the chip easy to get and/check it's non standard?

thanks,
D

desmojen · 09-Sep-2004, 15:29

Yep, it should have a code on it, you just ring one of the specialists (JHP or someone like that) who should be able to tell you if you have the right one or not.
Could be also that your tickover is just a tad too low?

Mr_S · 09-Sep-2004, 15:49

There was a thread on here a month or so ago with all the chip codes on them and what they should have been fitted to.

In fact it's here

http://217.199.188.40/xmb/viewthread...=9814#pid79924

Jason

[Edited on 9-9-2004 by Mr_S]

Mr_S · 09-Sep-2004, 16:05

I don't have plaster restricting my typing though :P

DeeJay · 09-Sep-2004, 16:39

Thanks guys! I don't actually think it's the chip though! I've just had it start with the 'choke' i.e 2k revs and you can still hear it missing occasionally.

I'll check the chip regardless, but this has got to be something to do with fuel/spark surely?

D

desmojen · 09-Sep-2004, 17:11

What do you think the chip does? Lol

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09-Sep-2004, 10:56	#2
748mart Registered Forum User Mille Posts: 268 Join Date: Jul 2001 Location: Essex Did you change the plugs as part of the service? Reply

09-Sep-2004, 12:35	#4
desmojen Registered Forum User 500SD Posts: 546 Join Date: Aug 2004 Location: Lyneham, Wilts Mood: DOH! The power band thing is quite normal mate, mines the same! Have you got the right chip in for your exhaust? Mine was terrible when I got it and that was why, but having said that mine is reminiscent of a bag of nails at tickover too. Reply

09-Sep-2004, 15:29	#6
desmojen Registered Forum User 500SD Posts: 546 Join Date: Aug 2004 Location: Lyneham, Wilts Mood: DOH! Yep, it should have a code on it, you just ring one of the specialists (JHP or someone like that) who should be able to tell you if you have the right one or not. Could be also that your tickover is just a tad too low? Reply

09-Sep-2004, 15:49	#7
Mr_S Registered Forum User Big Twin Posts: 1,324 Join Date: Mar 2004 Location: Gosport There was a thread on here a month or so ago with all the chip codes on them and what they should have been fitted to. In fact it's here http://217.199.188.40/xmb/viewthread...=9814#pid79924 Jason [Edited on 9-9-2004 by Mr_S] Reply

09-Sep-2004, 16:05	#8
Mr_S Registered Forum User Big Twin Posts: 1,324 Join Date: Mar 2004 Location: Gosport I don't have plaster restricting my typing though :P Reply

09-Sep-2004, 16:39	#9
DeeJay Registered Forum User Posts: 7 Join Date: Jul 2004 Thanks guys! I don't actually think it's the chip though! I've just had it start with the 'choke' i.e 2k revs and you can still hear it missing occasionally. I'll check the chip regardless, but this has got to be something to do with fuel/spark surely? D Reply

09-Sep-2004, 17:11	#10
desmojen Registered Forum User 500SD Posts: 546 Join Date: Aug 2004 Location: Lyneham, Wilts Mood: DOH! What do you think the chip does? Lol Reply