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General Category >> Rubber Side Down! >> Detent position on choke, query.
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Message started by sauvage on 07/01/16 at 19:37:41

Title: Detent position on choke, query.
Post by sauvage on 07/01/16 at 19:37:41

We have a gs500 and a recent s40 and I have noticed a completely different choke behaviour so I was wondering if there really is a difference or if it's just my imagination.

On the gs the choke lever is infinitely variable with no detent position it's either on, off or somewhere between, and behaves as I'd expect it to, which is as soon as it starts with full choke it is ticking over very fast an immediately needs to be turned down a bit and gradually turned down to off as it's warm.

However on the s40 there is on and off but there is a special detent position in between on and off that clicks into place. For all I know it could be a random point they chose, or they have chosen this point specifically, because the behaviour is very different to the gs.

From cold I'll pull the choke out all the way and when it starts unlike the gs it does not immediately race away it just stays at a fairly placid rpm being a bit lumpy and when it is pushed down to the detent position the rpm goes UP, but smoother. then when pushed all the way in the rpm goes down again.

Has the choke mechanism and how it works with relation to the jets been specifically designed for the characteristics of the respective bikes? Why does full choke out not make the engine rev fast as it does on the gs, is this because the single cylinder 4 valve design requires this?

thx.

Title: Re: Detent position on choke, query.
Post by Kris01 on 07/01/16 at 21:17:45

I've never had to pull the choke all the way out. It stumbles and runs too rich. The halfway detent runs best for me. I can't explain it. I just know what works for me.

Title: Re: Detent position on choke, query.
Post by batman on 07/01/16 at 22:40:29

It started !have a cold one ,why worry be happy!

Title: Re: Detent position on choke, query.
Post by Steve H on 07/02/16 at 02:18:30

The choke on the S40 is an enrichment valve. Rather than choking off the air flow like a regular choke, it allows more fuel in for starting. The middle detent is best described as a fast idle for fuel enriched warm up.

Don't let the bike sit on the sidestand idling. There is a cam lubrication issue if the bike isn't upright.

Title: Re: Detent position on choke, query.
Post by sauvage on 07/02/16 at 04:45:53

@Steve H, Ok thanks that makes sense.

Title: Re: Detent position on choke, query.
Post by Boofer on 07/03/16 at 19:20:53

I grew up in the age of chokes and even throttle knobs on the dash of trucks--use the choke for cranking and the throttle for warming up--or you ain't going nowhere. Every vehicle has its quirks and yours are no different. My 2001 will not crank when cold without a little choke on a 90 degree day. Runs good after a mile, so no problem.

Title: Re: Detent position on choke, query.
Post by Steve H on 07/03/16 at 20:34:12

Unless it's in the 40's or colder, mine doesn't like the choke at all. It's just fine to start without it. It will ride off with no choke at all on any summer day.

Title: Re: Detent position on choke, query.
Post by Kris01 on 07/04/16 at 15:43:10

Steve, you may be running a little rich. What jets are in the carb?

Title: Re: Detent position on choke, query.
Post by Steve H on 07/05/16 at 08:59:48

Main is a 155. Don't remember what the pilot is.

They were in it when I got it and it runs great so I haven't messed with them. I'm at 800 feet above sea level.

Title: Re: Detent position on choke, query.
Post by justin_o_guy2 on 07/05/16 at 12:57:42

Is the brake arm sooty?

Title: Re: Detent position on choke, query.
Post by Kris01 on 07/05/16 at 17:49:35

That does sound slightly rich, especially at 800' ASL.

Title: Re: Detent position on choke, query.
Post by Dave on 07/05/16 at 18:54:26

132A312B6869580 wrote:

That does sound slightly rich, especially at 800' ASL.

Sounds really rich to me.....nobody really needs 155 jets.

However.....the choke (enrichment knob) only works on the pilot jet circuit, so the main jet size doesn't affect how the choke works. The main jet doesn't really do much below half throttle.

Title: Re: Detent position on choke, query.
Post by Steve H on 07/07/16 at 10:16:10

Yes, it is sooty.

Title: Re: Detent position on choke, query.
Post by justin_o_guy2 on 07/07/16 at 16:16:04

Mine was too, but it ran really well.. And got 51 MPG with the girl driving, I got 49 ..
I had a Stage One cam, and a Supertrapp with 14 disks.