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post #1 of 15 (permalink) Old 08-17-2014, 08:56 PM Thread Starter
Bearcat
 
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chugging out

Hi have a 2001 vn750. I have it ear shaved with uni pod filters unoiled. Air screws are 2 1/2 turns out. Pulled the filters off the pitcock and put 2 inline filters in. Plugged the vacuum line to the right carb. Replaced the vacuum line to the left carb running to the pitcock. Also have marbles in the hoses going to the reed valves.

What its doing is chugging out and dieing when you open the throttle. This is with the bike in neutral and when you are ridding. The problem comes and goes. I can pull the choke on and it will rev to 4-5k but still boggs out when you roll on the throttle.

I have pulled the carbs and cleaned the jets. Couldnt get the screws loose to seperate the carbs and check the float bowls so I filled them full of carb cleaner threw the openings where the jets are located. I know the carbs are back in the boots tightly. I also tryed back blowing the carbs while they were off. To make sure it wasnt air locking from the vent in the cap on the tank I ran it with the cap open and it didnt help the problem.

Just got back from a test ride and it seems to be more pronounced after you have maintained a steady rpm and then slowed down. Then when you roll the throttle back on it chuggs down. Sometimes it will catch back up and sometimes it will die out.

Keep her rubber side down.
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post #2 of 15 (permalink) Old 08-17-2014, 09:05 PM
..have a vulcan good day!
 
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Quote:
Originally Posted by Jamesoct1990 View Post
Hi have a 2001 vn750. I have it ear shaved with uni pod filters unoiled. Air screws are 2 1/2 turns out. Pulled the filters off the pitcock and put 2 inline filters in. Plugged the vacuum line to the right carb. Replaced the vacuum line to the left carb running to the pitcock. Also have marbles in the hoses going to the reed valves.

What its doing is chugging out and dieing when you open the throttle. This is with the bike in neutral and when you are ridding. The problem comes and goes. I can pull the choke on and it will rev to 4-5k but still boggs out when you roll on the throttle.

I have pulled the carbs and cleaned the jets. Couldnt get the screws loose to seperate the carbs and check the float bowls so I filled them full of carb cleaner threw the openings where the jets are located. I know the carbs are back in the boots tightly. I also tryed back blowing the carbs while they were off. To make sure it wasnt air locking from the vent in the cap on the tank I ran it with the cap open and it didnt help the problem.

Just got back from a test ride and it seems to be more pronounced after you have maintained a steady rpm and then slowed down. Then when you roll the throttle back on it chuggs down. Sometimes it will catch back up and sometimes it will die out.
I am NOT a carb Guru.....................
Pull & clean your carb;s........
Your Tank Rusty ? ............



...carb guru's would be of great assistance.... pls comment....

'86 VN750 13,700 mi -Stock
-Purchased 2008 w/8800mi
Replaced ALL Cables . Kuryakyn LED Voltmeter
SilverStar Ultra 9003/HB2 H4 Headlamp, Jardine Fwd Controls,
Iridiums DPR7EIX-9 & Wires, Tuxedo Mod, Coil Mod, P/U Sensor Mod, Fork Seals,
Splines Lubed - 11/4/2012 - MF AGM Battery
Additional Flashing LED Brake Light on Trunk
Dampers went out @ 13+K !
After TOC MCCT's..... so amazingly quiet I discovered a rattling heat shield on my stock exhaust !
...have a vulcan good day!

Last edited by WilliamTech; 08-17-2014 at 09:10 PM.
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post #3 of 15 (permalink) Old 08-17-2014, 09:08 PM
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I know very little about this, but I will offer advice where I can...

Oil the filters. What I did was over-oil the filters, and (with the pk-92) I put the filter boot on a table, compressed the whole filter down, grabbed a rag, and gripped/squeezed the foam.

I can't wait to figure out what the problem is, but I'm going to put my bet on too much air flow.

These bikes need air restriction to operate properly. With no air restriction, the vacuum assembly doesn't work right.

Probably not your issue, just my guess

Also double check vacuum caps. Is your left vacuum in stock position (petcock to carb)?

Check your plugs, they might give you an indication, but I don't know.

I'm just a troll 'round these parts
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post #4 of 15 (permalink) Old 08-17-2014, 09:12 PM
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Quote:
Originally Posted by WilliamTech View Post
I am NOT a carb Guru.....................
Pull & clean your carb;s........
Your Tank Rusty ? ............



...carb guru's would be of great assistance.... pls comment....
Fuel filters would rule out rusty tank?
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post #5 of 15 (permalink) Old 08-17-2014, 09:14 PM
Crowley
 
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It seems that in the simplest form, you don't have the right air/fuel mixture.

Whether it's lean or rich, and where the problem is, that's the fun part to figure out.
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post #6 of 15 (permalink) Old 08-17-2014, 09:14 PM
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Quote:
Originally Posted by crowley1027 View Post
Fuel filters would rule out rusty tank?
I agree....
Quote:
It seems that in the simplest form, you don't have the right air/fuel mixture.

Whether it's lean or rich, and where the problem is, that's the fun part to figure out.
Quote:
Oil the filters. What I did was over-oil the filters, and (with the pk-92) I put the filter boot on a table, compressed the whole filter down, grabbed a rag, and gripped/squeezed the foam.

I can't wait to figure out what the problem is, but I'm going to put my bet on too much air flow.

These bikes need air restriction to operate properly. With no air restriction, the vacuum assembly doesn't work right.
most others will also agree......& I would think.... but Symptoms prevail......


'86 VN750 13,700 mi -Stock
-Purchased 2008 w/8800mi
Replaced ALL Cables . Kuryakyn LED Voltmeter
SilverStar Ultra 9003/HB2 H4 Headlamp, Jardine Fwd Controls,
Iridiums DPR7EIX-9 & Wires, Tuxedo Mod, Coil Mod, P/U Sensor Mod, Fork Seals,
Splines Lubed - 11/4/2012 - MF AGM Battery
Additional Flashing LED Brake Light on Trunk
Dampers went out @ 13+K !
After TOC MCCT's..... so amazingly quiet I discovered a rattling heat shield on my stock exhaust !
...have a vulcan good day!

Last edited by WilliamTech; 08-17-2014 at 09:34 PM.
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post #7 of 15 (permalink) Old 08-17-2014, 09:15 PM
..have a vulcan good day!
 
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Quote:
Originally Posted by crowley1027 View Post
It seems that in the simplest form, you don't have the right air/fuel mixture.

Whether it's lean or rich, and where the problem is, that's the fun part to figure out.

'86 VN750 13,700 mi -Stock
-Purchased 2008 w/8800mi
Replaced ALL Cables . Kuryakyn LED Voltmeter
SilverStar Ultra 9003/HB2 H4 Headlamp, Jardine Fwd Controls,
Iridiums DPR7EIX-9 & Wires, Tuxedo Mod, Coil Mod, P/U Sensor Mod, Fork Seals,
Splines Lubed - 11/4/2012 - MF AGM Battery
Additional Flashing LED Brake Light on Trunk
Dampers went out @ 13+K !
After TOC MCCT's..... so amazingly quiet I discovered a rattling heat shield on my stock exhaust !
...have a vulcan good day!
WilliamTech is offline  
post #8 of 15 (permalink) Old 08-17-2014, 09:22 PM Thread Starter
Bearcat
 
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Ive ran the bike with this set up for a cupple of months and shes ran fine with the dry filters and I put new ngk plugs in a cupple months ago. I pulled them when it started acting up and they read just right to a hair rich.

Keep her rubber side down.
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post #9 of 15 (permalink) Old 08-17-2014, 09:31 PM
..have a vulcan good day!
 
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Quote:
Originally Posted by Jamesoct1990 View Post
Ive ran the bike with this set up for a cupple of months and shes ran fine with the dry filters and I put new ngk plugs in a cupple months ago. I pulled them when it started acting up and they read just right to a hair rich.
Dry Filters ?

.....sounds logical to me...


'86 VN750 13,700 mi -Stock
-Purchased 2008 w/8800mi
Replaced ALL Cables . Kuryakyn LED Voltmeter
SilverStar Ultra 9003/HB2 H4 Headlamp, Jardine Fwd Controls,
Iridiums DPR7EIX-9 & Wires, Tuxedo Mod, Coil Mod, P/U Sensor Mod, Fork Seals,
Splines Lubed - 11/4/2012 - MF AGM Battery
Additional Flashing LED Brake Light on Trunk
Dampers went out @ 13+K !
After TOC MCCT's..... so amazingly quiet I discovered a rattling heat shield on my stock exhaust !
...have a vulcan good day!
WilliamTech is offline  
post #10 of 15 (permalink) Old 08-17-2014, 11:03 PM
Crowley
 
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So you've been riding this bike for a while? I wonder if this is a result of mechanical malfunction, or if it's a product of a mistake in a procedure (did you do any work to the bike in the past couple months at all?)
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