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General Category >> Rubber Side Down! >> Proper choke function?
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Message started by Quimrider on 05/18/15 at 14:17:57

Title: Proper choke function?
Post by Quimrider on 05/18/15 at 14:17:57

I am slightly perplexed by function of the choke on my 2002 savage. Usually the choke or more appropriately the enricher will make the idle go up 500-1000 RPM or more on other bikes I've owned. My savage is acting like the carb is adding too much fuel and it doesn't affect cold idle more than about 200 rpm.

I currently have a new pilot jet in the stock size and am 2.75 turns out on the idle jet screw (or whatever it's called). My savage has 3 "clicks" or stops on the choke. For the sake of this post I'll call the first stop out "low", second stop out "partial", and choke pulled all the way out "full". On a cold engine my highly calibrated ear tachometer says about 800 RPM idle (yes I know this is bad). If I set the choke at "low" the idle speed up to about 1000 RPM. when I set it to partial choke the idle goes back down to about the same as no choke 800ish RPM. Full choke results in even lower idle or stalling.

What I want to know is how the choke should function. In other words, is what I'm experiencing normal or should the RPMs jump up to 1500-2000RPM when using the choke?

Title: Re: Proper choke function?
Post by justin_o_guy2 on 05/18/15 at 14:30:55

If I had a clue, I'd be sharing. I'm sure gonna be watching to see what the carb gurus say. I will say this,,, it's easy to twist the idle speed, and low idle is,as you noted, bad.
After I did all the mods it idled so low when it was cold ,even with the choke out, I hadda adjust the idle screw. As it warmed up I'd adjust the idle down.
Easy enough to do riding.

Title: Re: Proper choke function?
Post by verslagen1 on 05/18/15 at 14:52:24

Mine has full in, full out and midway.
midway bumps the rpms up, full out does not.
occasionally I use midway on those mid 40's mornings.
full out usually kills it.
what can I say, terrible cali weather ;)

Title: Re: Proper choke function?
Post by Gary_in_NJ on 05/18/15 at 17:25:55

The rpms will not jump to 1500 on this bike. As soon as my bike starts and has worked into a steady idle I remove the choke and work the throttle. Idle time is minimal and I'm riding as soon as I can. Within a mile I'm warmed up.

Title: Re: Proper choke function?
Post by Kris01 on 05/18/15 at 17:27:46

Sounds normal to me.

Full in does nothing. Full out smokes and idles erratically. Midway is just right.

Title: Re: Proper choke function?
Post by Dave on 05/19/15 at 03:17:14

You have to remember....the choke is made so it will start a bike in arctic climates......and summer as well. If you are only a warm weather rider you may never need to use the choke (fuel enrichment valve) in the full on position.

My bike was properly jetted and ran great, and I almost never had to use the choke to start the bike. And yes....the idle speed was a bit low until the bike warmed up. I got geared up, started the bike and held the throttle open a little bit for about 30 seconds to get the oil flowing...then slowly rode away and didn't use a lot of throttle for a few miles as the bike warmed up.

Title: Re: Proper choke function?
Post by Quimrider on 05/19/15 at 05:10:09

Thanks for the feedback. It sounds like my choke is functioning as it should. It's just a little different than I am used to.

Title: Re: Proper choke function?
Post by HAPPYDAN on 05/19/15 at 07:15:13

My carb set-up is essentially stock, except for about 2.5 turns on the idle air-mix screw. I start with full choke regardless of temp, it fires right up. After a few seconds, it begins to stumble, and I push it all the way in and pull back out to the first stop, which seems to correspond to half-choke. Idle is smooth at about 1,000 rpm. There is an intermediate stop between full and half, but I don't use it. Regardless of choke position, the idle stays about the same. Riding on half-choke in cool weather, the RPM's will "hang" for a few seconds when engaging the clutch and rolling off the throttle. In warm weather (60+) the choke comes off after about 1-2 miles, and all is normal. Just to note, years ago I had a Honda CB-360T that did the same thing.