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Carbs and Fuel System
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post #1 of 6 (permalink) Old 05-29-2013, 10:49 PM Thread Starter
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I just got a o5 vn750 with 9500 miles on it.When starting it seems to help if I crack the throttle just a taste. After it warms up it is even harder to start. If I let it set for a few minutes it starts better. Could these conditions indicate carb issues? The bike sat a lot but was always garaged.
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post #2 of 6 (permalink) Old 05-29-2013, 11:23 PM
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Originally Posted by farmgurl58 View Post
I just got a o5 vn750 with 9500 miles on it.When starting it seems to help if I crack the throttle just a taste. After it warms up it is even harder to start. If I let it set for a few minutes it starts better. Could these conditions indicate carb issues? The bike sat a lot but was always garaged.
VN750's are often known to be hard starting when Hot.
The electrical Pick-up Sensor Mod is known to assist in Hot starting issues and is always recommended.

"Search" will provide many threads on "how to".

hope this helps

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'86 VN750 13,700 mi -Stock
-Purchased 2008 w/8800mi
Replaced ALL Cables . Kuryakyn LED Voltmeter
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Splines Lubed - 11/4/2012 - MF AGM Battery
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Dampers went out @ 13+K !
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...have a vulcan good day!

Last edited by WilliamTech; 05-29-2013 at 11:26 PM.
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post #3 of 6 (permalink) Old 05-30-2013, 12:33 PM
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Garage
It could be a lot of things, but the Pickup Coil mod usually helps with hard starts when bike is HOT. If you are having cold start issues, it might be something else.

It is possible that you have bad fuel or moisture in the fuel....could be dirty carbs or bad choke.

Try adding Seafoam to the fuel and see if it gets any better with a tankfull or two of treated fuel.

Check you spark plugs to see if the engine is running hot or lean or rich.

Check to make sure you have a good spark on EACH plug. Also check that the coils are getting good voltage to them. It should be as close to your battery voltage as possible. If not, you are dropping voltage somewhere in the wire harness and your coils will not provide a good spark. If that is the case you might consider doing the Ignition Coil wiring Mod.

If all the above are OK and the Seafoam doesn't help, then I would go ahead and do the Pickup Coil Mod shownHERE
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post #4 of 6 (permalink) Old 05-30-2013, 12:49 PM
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Quote:
When starting it seems to help if I crack the throttle just a taste. After it warms up it is even harder to start. If I let it set for a few minutes it starts better.
Cracking the throttle for a warm start can be considered normal for any vehicle with a carb. True, some or most may start without doing so, but it can still be considered normal and is in most startup instructions.

So during the hard warm start, what happens? Long cranking, slow cranking? And what is different about the startup after it sits a bit?

Slow cranking when hot could mean the starter needs attention, new brushes and maybe new bushings.

Long cranking with the throttle opened could mean it's rich, or loading up with fuel after you shut it down. Do you see any black smoke after a hard start?

More details about the hard starts will help get better answers and get directly to the problem.

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post #5 of 6 (permalink) Old 05-30-2013, 01:01 PM
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Pilot circuit mixture screws adjusted too far out?
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post #6 of 6 (permalink) Old 05-30-2013, 01:29 PM
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Hard Starts

Have you got the NKG plugs? The right spark plugs and a good battery. So far that is all I've had to do, and it starts Easley hot or cold.

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