Idle and Low throttle sputtering.... - Motorcycle-Journal Forums

Spencer_LV · 01-30-2006, 12:27 PM

I have an 01 Volusia 800, Its got a set of Vanc and Hines pipes, and a Dynojet needle/jet pack in the carb... Right now, it refuses to Idle with the choke off, and it sputters when you have very little throttle. an example of this would be if I were to be going 50MPH in 5th gear, the bike sputters slightly (you feel a pulse in the power), if I accelerate to 55, the bike stops sputtering.

Now obviously these problems stem from the carb not being setup properly, but sadly I have very little experiance in dealing with carbs. So can any one point me in the right direction for tuning the bike, or is this something better left to a mechanic?

Thanks!

**Clint** · 01-30-2006, 01:16 PM

You can do it yourself. First, I'd contact Dynojet. Did they give you some baseline settings for the mixture screws? Do they offer different jet sizes for different elevations? Your carbs have three circuits in them, and along with the fuel screw, you'll want to adjust the pilot jet size if you went too large. The specific sizes and screw settings are not in my head, so you'll need to contact them.

Chances are someone else here knows this stuff. In the meantime, here's a good tutorial.

Spencer_LV · 01-30-2006, 01:55 PM

Thanks for the info, Part of the tuning problem for me is not knowing which screw on the carb does what...

blackie1491 · 01-30-2006, 03:33 PM

Spencer
If you post your location, sometimes a local rider will offer assistance.

Spencer_LV · 01-30-2006, 03:50 PM

Quote:

Originally Posted by blackie1491

Spencer
If you post your location, sometimes a local rider will offer assistance.

I'm out in Las Vegas, South west side of town.

I ponyed up for a Shop service manual, which should show up in a few days.

Spencer_LV · 03-14-2006, 01:49 AM

So now I'm just fustrated. Cleaned the carb and jets, so now it doesnt sputter at low throttle, but it absolutly does not want to idle at all with out at least one click on the choke.

So what am I doing wrong? what could I have over looked?

**Clint** · 03-14-2006, 01:58 PM

Did you get the baseline settings? It's all pointless unless you have a place to start.

Spencer_LV · 03-14-2006, 04:35 PM

The thing is I can get it to idle almost perfectly (the proper RPM's) with one notch on the choke. So I'm thinking that I may have the Idle adjusted horribly low, so that when I turn the choke off it instantly dies.

Tonight I'm going to turn up the idle adjustment and see If that helps

Spencer_LV · 03-14-2006, 09:42 PM

Woo! got the thing to idle with out the choke on, but it doesnt idle smoothly... it fluctuates between an idle and stoping, but it catches its self and keeps idleing.

possibly a miss adjusted float?

Blade · 03-29-2006, 02:03 AM

Check your air fuel screws and make sure they are at least 3 turns out. With the V&H pipes, you may need up to an additional 1/2 to 3/4 turn out. Also make sure your floats are set to 7.0 MM.

If you have to adjust the air fuel screws out more, do it a little at a time, I would recommend about 1/8 turn and then run it a bit and see if it gets better or worse.

Low speed it usually affected most by the following:
Air/fuel screws
Pilot Jets
needles

So it your upper and mid range are good, then this is where you will need to look.

Spencer_LV · 04-03-2006, 11:58 AM

^^ Thanks!

Tweaked the A/F and got it running with out the choke. idle seems to fluxuate a bit, and it started to sputter at low throttle again. But hey, its a start.

Now its time to check the plugs....

01-30-2006, 12:27 PM	#1 (permalink)
Spencer_LV Newbie Joined: Jan 2006 Posts: 8	Idle and Low throttle sputtering.... I have an 01 Volusia 800, Its got a set of Vanc and Hines pipes, and a Dynojet needle/jet pack in the carb... Right now, it refuses to Idle with the choke off, and it sputters when you have very little throttle. an example of this would be if I were to be going 50MPH in 5th gear, the bike sputters slightly (you feel a pulse in the power), if I accelerate to 55, the bike stops sputtering. Now obviously these problems stem from the carb not being setup properly, but sadly I have very little experiance in dealing with carbs. So can any one point me in the right direction for tuning the bike, or is this something better left to a mechanic? Thanks!

03-14-2006, 09:42 PM	#9 (permalink)
Spencer_LV Newbie Joined: Jan 2006 Posts: 8	Woo! got the thing to idle with out the choke on, but it doesnt idle smoothly... it fluctuates between an idle and stoping, but it catches its self and keeps idleing. possibly a miss adjusted float? Last edited by Spencer_LV; 03-15-2006 at 01:54 AM.

03-29-2006, 02:03 AM	#10 (permalink)
Blade Official M-J Vendor Joined: Mar 2006 Location: La Quinta, Ca Posts: 609	Check your air fuel screws and make sure they are at least 3 turns out. With the V&H pipes, you may need up to an additional 1/2 to 3/4 turn out. Also make sure your floats are set to 7.0 MM. If you have to adjust the air fuel screws out more, do it a little at a time, I would recommend about 1/8 turn and then run it a bit and see if it gets better or worse. Low speed it usually affected most by the following: Air/fuel screws Pilot Jets needles So it your upper and mid range are good, then this is where you will need to look. __________________ Bill Johnson Email: bill@billsbikesnservice.com website: www.billsbikesnservice.com

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01-30-2006, 01:55 PM	#3 (permalink)
Spencer_LV Newbie Joined: Jan 2006 Posts: 8	Thanks for the info, Part of the tuning problem for me is not knowing which screw on the carb does what...

01-30-2006, 03:33 PM	#4 (permalink)
blackie1491 I took the All Bran Challenge Joined: Jun 2005 Bike: C50SE Location: Aldergrove, B.C., Canada Posts: 7,325	Spencer If you post your location, sometimes a local rider will offer assistance.

03-14-2006, 01:49 AM	#6 (permalink)
Spencer_LV Newbie Joined: Jan 2006 Posts: 8	So now I'm just fustrated. Cleaned the carb and jets, so now it doesnt sputter at low throttle, but it absolutly does not want to idle at all with out at least one click on the choke. So what am I doing wrong? what could I have over looked?

03-14-2006, 04:35 PM	#8 (permalink)
Spencer_LV Newbie Joined: Jan 2006 Posts: 8	The thing is I can get it to idle almost perfectly (the proper RPM's) with one notch on the choke. So I'm thinking that I may have the Idle adjusted horribly low, so that when I turn the choke off it instantly dies. Tonight I'm going to turn up the idle adjustment and see If that helps

04-03-2006, 11:58 AM	#11 (permalink)
Spencer_LV Newbie Joined: Jan 2006 Posts: 8	^^ Thanks! Tweaked the A/F and got it running with out the choke. idle seems to fluxuate a bit, and it started to sputter at low throttle again. But hey, its a start. Now its time to check the plugs....

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