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Message started by wolf391 on 07/30/13 at 12:31:14

Title: Double Idle Speed
Post by wolf391 on 07/30/13 at 12:31:14

Have a question that I hope will have a simple answer. :o

My bike is a 87 Ls650 and will idle at what sounds like the proper RPM (I don't have a TAC so I don't know for sure). However at times the idle will drop down to a HD type - thump thump thump. I have no idea what is causing this. Anyone know what is going on and what I can do to get rid of the problem ? Thanks for your help.

Title: Re: Double Idle Speed
Post by verslagen1 on 07/30/13 at 12:37:48

betcha you got an intake leak that seals itself every once in a while.

Title: Re: Double Idle Speed
Post by swedishbiker on 07/30/13 at 15:50:48

Next time, take a can start spray and spray around the carb. If it changes you have a leak.

Title: Re: Double Idle Speed
Post by WD on 07/31/13 at 08:46:40

WD40 is a lot safer to use than ether when leak checking... especially if the cylinder is already warmed up.

Title: Re: Double Idle Speed
Post by wolf391 on 07/31/13 at 10:30:34

Thanks guys for the quick response. :) I will check it out. Kurt

Title: Re: Double Idle Speed
Post by Digger on 08/17/13 at 17:42:05

5744000 wrote:

WD40 is a lot safer to use than ether when leak checking... especially if the cylinder is already warmed up.

I think I remember reading a while back that propane was no longer used as the propellant in spray cans of WD-40.

If this is true, does WD-40 still work in tracking down intake leaks?

Title: Re: Double Idle Speed
Post by verslagen1 on 08/17/13 at 18:16:17

614C42424057250 wrote:

If this is true, does WD-40 still work in tracking down intake leaks?

Yes, used it last week.
but instead of vroom vroom, it goes sputter sputter
was able to detect a minor leak in the oring of the throttle butterfly shaft.