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Message started by 4forths on 10/22/09 at 05:44:11

Title: Bike only runs well with Choke out
Post by 4forths on 10/22/09 at 05:44:11

My 95 Savage (with Dyna muffler) runs perfectly with the Choke out, but as soon as I put the Choke in, it coughs and sputters, and backfires. It feels like you are running out of gas, even though the tank is full. Any ideas on where to start?

Title: Re: Bike only runs well with Choke out
Post by bill67 on 10/22/09 at 05:48:16

I would run some SeaFoam in the gas tank and see what happens.

Title: Re: Bike only runs well with Choke out
Post by Routy on 10/22/09 at 06:02:33

If it idles ok w/o choke, I would go for a partially plugged main jet.
I have not done it, but if I remember correctly, the main jet is easily removed w/o removing tank or carb.

Title: Re: Bike only runs well with Choke out
Post by AngloSaxon on 10/22/09 at 06:22:44

Did you upgrade the jets yet? If not, then that would be my next move.

Title: Re: Bike only runs well with Choke out
Post by verslagen1 on 10/22/09 at 11:36:15

clean carb if seafoam in tank doesn't work

Title: Re: Bike only runs well with Choke out
Post by justin_o_guy2 on 10/22/09 at 11:37:33

Did the problem start when the Dyna was installed?

Title: Re: Bike only runs well with Choke out
Post by Digger on 12/16/09 at 19:35:22

7E2C25383E22394A0 wrote:

Probably late, but I'm guessin' pilot jet is dirty.

Title: Re: Bike only runs well with Choke out
Post by Micvicpel on 12/17/09 at 14:17:06

I having the same issue, heres my list of things I checked, the petcock, the main jet upgraded it to a 155, pilot jet is stock, ran seafoam through tank, cleaned carb with carb cleaner, now here is where Im at it runs fine with the choke out of half out, and doesnt backfire, spit, sputter, all is well, soon as I push the choke in it sputters like its about to die then adjust the idle, idles fine and soo as I take off and get ready to shift koopow, any ideas guys,I have another thread under carb issues non of the motorcycle shops are open due to christmas there booked up unitl after the new year, I live in gainesville if you know a mechanic let me know please...

Title: Re: Bike only runs well with Choke out
Post by justin_o_guy2 on 12/17/09 at 18:25:05

Try closing the throttle slowly coming down from higher RPM'

If you havent messed with the white washer, maybe its time. But, before anything else, Id suggest getting the air mix screw set. Do it twice, or 3 times. Count in to stop, open back out & go 1/4 turn past. Ride it. See if you can operate the throttle in a way that keeps it from B/firing. Mess w/ that mixture screw ( 1/4 turn) & listen to the engine, ride.

You can also open it till it starts to sound "wrong" & close it till it starts sounding "sick" again & go in the middle of that & see how it acts.

Title: Re: Bike only runs well with Choke out
Post by Micvicpel on 12/18/09 at 17:24:51

Thanks I finally got my carb apart with some vicegrips and lote of wd40. Ill post after I put it back together. White washer gone little washers in palce half of the white washer and tomorrow new screws with hex heads. then to notch my air fuel scew so i can adjust dremel should do.

Title: Re: Bike only runs well with Choke out
Post by smokin_blue on 12/19/09 at 06:03:53

143937373522500 wrote:

[quote author=7E2C25383E22394A0 link=1256215451/0#0 date=1256215451]My 95 Savage (with Dyna muffler) runs perfectly with the Choke out, but as soon as I put the Choke in, it coughs and sputters, and backfires. It feels like you are running out of gas, even though the tank is full. Any ideas on where to start?

Probably late, but I'm guessin' pilot jet is dirty.[/quote]

Digger is right. If it is only at the idle point or just off throttle it is the pilot circuit (this is provided you don't just have your idle set too low). Usually the pilot jet gets plugged. It has the smallest hole of all the jets in your carb. One way to confirm is if you can get going on choke and once up to 1/2 throttle it runs fine with the choke in then it is just the pilot circuit that is bad. Now if you find the pilot jet perfectly clean then there is a little known passage that feeds from the pilot to the throat of the carburator just down stream of the butter fly valve (or slide depending on CV or VM carb). It allows the gas into the airstream when the throttle is closed. This one requires squirting carb spray into the pilot jet opening (or manytimes you can find the air passageway at the front of the carb throat and squirt in there) and you should see a little tiny squirt of spray come out of the tiny hole I described above in the carb throat. The hole is on the botton of the throat.

Generally the it is just the pilot jet that causes your issue but I have cleaned carbs where that passage gets gummed up to.

Title: Re: Bike only runs well with Choke out
Post by Tonydtiger1971 on 12/19/09 at 14:49:31

How about one where it won't run with the choke out but runs well otherwise?

Title: Re: Bike only runs well with Choke out
Post by BurnPgh on 12/20/09 at 00:04:05

Tony - It starts well with no choke? Runs well normally? Count yourself lucky. You're pretty much as perfectly tuned as you're going to get unless you're rich at speed. You might be a bit rich in general but if you start well and run well I wouldnt mess too much with a good thing.
If you're curious get a new plug (or 3) and test each circuit. Idle a while, pull the plug. Good? If not are you lean or rich? Readjust if needed. If you had to readjust try it again. If you're good go ride around at more or less half throttle for 10-15 minutes, pull the plug. Good? If not are you lean or rich? Readjust if needed. If you had to readjust try it again. Go WOT up hill and hit the kill switch while you simultaneously pull in the clutch, pull the plug. Good? If not are you lean or rich? Readjust if needed. If you readjusted try it again. Over and over again until you get it all right.

If a WOT plug chop seems too much for you go WOT for a 10-15 seconds (assuming the idle and mid range is correct). Now let back on the throttle. If you get a boost when you let off the throttle your main jet is lean, go one size up and try it again.

Title: Re: Bike only runs well with Choke out
Post by Digger on 01/03/10 at 21:17:06

47595B5F5D5A6B56584151340 wrote:

[quote author=143937373522500 link=1256215451/0#6 date=1261020922][quote author=7E2C25383E22394A0 link=1256215451/0#0 date=1256215451]My 95 Savage (with Dyna muffler) runs perfectly with the Choke out, but as soon as I put the Choke in, it coughs and sputters, and backfires. It feels like you are running out of gas, even though the tank is full. Any ideas on where to start?

Probably late, but I'm guessin' pilot jet is dirty.[/quote]

.....Now if you find the pilot jet perfectly clean then there is a little known passage that feeds from the pilot to the throat of the carburator just down stream of the butter fly valve (or slide depending on CV or VM carb). It allows the gas into the airstream when the throttle is closed. This one requires squirting carb spray into the pilot jet opening (or manytimes you can find the air passageway at the front of the carb throat and squirt in there) and you should see a little tiny squirt of spray come out of the tiny hole I described above in the carb throat. The hole is on the botton of the throat.

Generally the it is just the pilot jet that causes your issue but I have cleaned carbs where that passage gets gummed up to.
[/quote]

Good point.

If you suspect the passage that Smokin' was talking about is clogged and you can't get any of the carb cleaner spray to go all the way through it, I might try removing the pilot jet, then gently running a 0.011" guitar string through the passage. Since the guitar string is steel, it might scratch the jet, which is made of brass. That is why I'd remove it first.

I stole the guitar string idea from Serowbot.