Unstable idle

chaza · Nova Slayer Joined: 02 May 2018 Karma :

Hi guys
I have this ajs dd125e8 12 plate, the idling on the bike is irratic, it has had new twin carbs put on, so I suspected they may not be set up right, then I looked at the air induction valve.
Do you think this might be faulty, when start her from cold, just a fraction movement of the throttle makes the idle faster,as much as 15...100 Rpm. It goes back after about 15 secs, if I leave it, it will stall, so far she runs ok. I've got a 180 mile journey at the weekend .
What do you think. ...

Thanks chaza

Evil Hans · World Chat Champion Joined: 08 Nov 2015 Karma :

Not sure I understand the question.

Would a 15 rpm increase even register?

Or is that meant to say 15,100? In which case - wow!
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chaza · Nova Slayer Joined: 02 May 2018 Karma :

The increase is about 500 sorry, I don't have a Rev counter yet. But the point is, the increase is concerning. If it idles at 1000, the increase is around 1500,1600.
As I said, I'm not sure if the carbs are not set right, or I have an issue with the air induction system.

Thanks
Chaza

Evil Hans · World Chat Champion Joined: 08 Nov 2015 Karma :

chaza · Nova Slayer Joined: 02 May 2018 Karma :

I think you misunderstood what was saying.
Normally you turn the throttle, Rev increase then return to idle, mine, you increase the throttle just a little bit, where you would expect slight Rpm increase, I get lots of increase, to where it rises to about 500 or 600 Rpm.
I'll check again, but I don't think I have an air box leak.
That's why I was looking at the air induction system valve.or the new twin carbs not being synced or set up right.
When she's warm the choke will stall her, if I leave it idling, it gradually drops idle, then stops.
I hope I am making sense.

Thanks
Chaza

chaza · Nova Slayer Joined: 02 May 2018 Karma :

I think I've sorted it.
I made the big mistake of not checking the oil, I drove 180 miles at the weekend, when I got there I checked the oil, she was very low, after filling her up she ran as she should. I wired my Rev counter and she idles at 1500.
I don't get how the low oil would make her react like that. I'll be more careful in future.
Thanks for your input guys.

Riejufixing · World Chat Champion Joined: 24 Jun 2018 Karma :

chaza · Nova Slayer Joined: 02 May 2018 Karma :

Yeah sorry
It's official, I'm a dick