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Carbs and Fuel System
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post #1 of 10 (permalink) Old 06-08-2011, 07:19 PM Thread Starter
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Help PLEASE

Ok so I have a 1990 VN750 with 35000 miles I have done earshave and coaster and new exhaust it ran better than ever after these mods but then I painted the bike I masked everything really well but anyway now when I get to 60 or so it acts like it's running output gas I toll the carbs off and reclined then and made sure the boots where fitting well and it did get better bit I'm out o ideas now so please help
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post #2 of 10 (permalink) Old 06-08-2011, 08:44 PM
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Originally Posted by mwilliams5891 View Post
Ok so I have a 1990 VN750 with 35000 miles I have done earshave and coaster and new exhaust it ran better than ever after these mods but then I painted the bike I masked everything really well but anyway now when I get to 60 or so it acts like it's running output gas I toll the carbs off and reclined then and made sure the boots where fitting well and it did get better bit I'm out o ideas now so please help
Does your carb vent hose have a filter on the end after the earshave and new paint, or is it just laying open?

Oh, BTW, welcome to the Vulcan madness.

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1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

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July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15


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Last edited by OlHossCanada; 06-08-2011 at 09:12 PM.
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post #3 of 10 (permalink) Old 06-09-2011, 01:51 AM
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Just as what Gordon said, sound like youre vent hose is open to the elements and once ya hit 60 the force of the wind cause to much back pressure. When I did my ear shave I didnt put a filter on that hose I just tucked it up under the tank facing twords the rear and ziped tied it to stay put.

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post #4 of 10 (permalink) Old 06-09-2011, 09:31 AM
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If that is the culpret you could also place the hose in the open end of the frame under the tank. that is where I placed mine & it is a great spot. Check your other vacume lines for cracks as well. One might have partially broke when you took it apart & re installed. It is a '90 after all.

Last edited by kanuck69; 06-09-2011 at 02:14 PM.
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post #5 of 10 (permalink) Old 06-09-2011, 01:23 PM
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If that is the culpret you could also place the hose in the open end of the frame under the tank. that is where I placed mine & it is a great spot. Check your other vacume lines for cracks as well. One might have partially broke when you took it apart & re installed. It is a 90' after all.
Kanuck, you have a 90 foot vacuum line on the Vulcan!? (90 * bend? )

Gordon

1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

H-D windshield
Relocated R/R
MF-AGM battery
Fiamm Freeway Blaster horns
F&S luggage rack and engine guard
Kury Offset Hiway pegs
July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15


TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/showthread.php?t=9127
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post #6 of 10 (permalink) Old 06-09-2011, 02:14 PM
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LOL, his bike is a 1990. I guess I could have been alittle clearer.
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post #7 of 10 (permalink) Old 06-09-2011, 03:01 PM
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Oops, missed that it was a `90. I guess the apostrophe AFTER the 90 threw me. lol

Gordon

1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

H-D windshield
Relocated R/R
MF-AGM battery
Fiamm Freeway Blaster horns
F&S luggage rack and engine guard
Kury Offset Hiway pegs
July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15


TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/showthread.php?t=9127
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post #8 of 10 (permalink) Old 06-09-2011, 06:17 PM
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Quote:
Originally Posted by kanuck69 View Post
If that is the culpret you could also place the hose in the open end of the frame under the tank. that is where I placed mine & it is a great spot.
This is what I did as well, perfect spot in the center frame tube.

'98 VN750, Mustang Seat, F&S Engine Guards, Highway pegs, Pro-Tac backrest, Harley 58121-85B windshield lowers, Autometer 3391 voltmeter, ACCT to MCCT, pickup coils at 0.020", Coasters, National Cycle N2220, Vista Cruise Universal, Single Filter Ear Shave, Givi Monokey Sidebag Mounts, Givi E21 side bags, Knifemaker style turn signal relocation, helmet locks relocated.
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post #9 of 10 (permalink) Old 07-10-2011, 12:53 PM Thread Starter
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sorry it took me so long to get back to you guys no I put a filter on it and its tucked under my seat.....I did read about that problem and I followed what people had done...........also I found an exhaust leak could that little guy be doing it? it causes problems in the low end......please help me! lol
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post #10 of 10 (permalink) Old 07-10-2011, 06:24 PM
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Check the petcock vaccuum hose for cracks or leaks. If cracked replace it. If you paint the engine make sure that you are not loosing your plug spark through the paint. Also make sure that both your coils are well connected.

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