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post #1 of 33 (permalink) Old 04-22-2010, 04:18 PM Thread Starter
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Difficulty starting

Today I had trouble starting. Seemed to have the most trouble when the bike was warm. I started the bike this morning just fine, rode it to class, no issues. Went to my one hour class and when class was over, I couldn't get it to start. It finally started when I gave it some choke AND some gas (even though the engine was warm according to the temp gage) that finally seemed to get it to fire up. Rode it from school to run some various errands. Each time, to get it to start, I had to open the throttle completely as far wide open as it would go. It wouldn't want to fire up otherwise. Once, it seemed like the battery was going to die, as it struggled just to turn over. But ever since that one time, it has turned over just fine, but wouldn't start unless I gave it full throttle.

I will continue to see if I can find any patterns, but so far it seems like sometimes it fires up just fine, and other times, not so much.

I do have a MF AGM battery, recommended to me by lance. it's a DEKA. I have iridium spark plugs as well.

2006 VN750 acquired March, 2010, 19,544 miles
Currently 20,147 miles (5/1/2010)
Splines lubed
R\R relocated
Deka MF AGM ETX15L
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Pirelli MT66 tires 110 front 150 rear
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post #2 of 33 (permalink) Old 04-22-2010, 04:35 PM
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try putting some sea foam in the fuel the vn750 seems to like that stuff
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post #3 of 33 (permalink) Old 04-22-2010, 04:44 PM
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How old is the battery?
Have you checked the voltage lately?
Try putting it on a battery tender overnight, and see if it starts any better during the day when it is warm or hot.
Is the starter draggy at all when the battery is fully charged.

Check the plugs for color or if they are wet.
Practice a bump start. <G> Sorry, but that`s the method of last resort.

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post #4 of 33 (permalink) Old 04-24-2010, 09:29 PM
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hard start

Talked to a fellow club member who has been riding an 87 for many years. He says a lot of VN750s are hard starts.

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post #5 of 33 (permalink) Old 04-24-2010, 09:54 PM
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Normally I have the best starts when I put the choke on full and press the ignition switch without giving any gas at all. Hold the switch down until you get full start, not just the beginning of a start. It's only for three or four seconds, not enough to hurt your starter or ignition, but it should ensure an easy start.

Once the engine starts to rev beyond 3000+ rpm's, I back down on the choke to keep the rpm's at just under 3000. This keeps the rattle down as well. Good idea to let the oil circulate a bit before actually putting your bike in gear, and I usually lower the choke and rpm's to no more than 2000 just as I put it in first gear. That keeps the clunking down!

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post #6 of 33 (permalink) Old 04-26-2010, 06:18 PM Thread Starter
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Quote:
Originally Posted by OlHossCanada View Post
How old is the battery?
Have you checked the voltage lately?
Try putting it on a battery tender overnight, and see if it starts any better during the day when it is warm or hot.
Is the starter draggy at all when the battery is fully charged.
Battery is 2 weeks old.

I just checked the voltage. 13.1V when the bike is off. 14.2V when it is revving at 4,000 rpm. What do ya'll think about that? good? bad?

One thing I noticed is that when I released the throttle (after holding it at 4,000 rpm), the Voltage jumped up to 14.6V for a split second before settling down back to 13V.

I'll try charging the battery sometime soon, and see if it starts better.
But it just feels like the motor has to turn over way longer than it used to before it'll fire up.

2006 VN750 acquired March, 2010, 19,544 miles
Currently 20,147 miles (5/1/2010)
Splines lubed
R\R relocated
Deka MF AGM ETX15L
Iridium spark plugs
Pirelli MT66 tires 110 front 150 rear
Speed bleeders

Last edited by Mac84; 04-26-2010 at 06:21 PM.
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post #7 of 33 (permalink) Old 04-26-2010, 06:29 PM
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Try no choke and no throttle on your hot starts.

DT

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post #8 of 33 (permalink) Old 04-26-2010, 07:04 PM Thread Starter
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Quote:
Originally Posted by dirtrack650 View Post
Try no choke and no throttle on your hot starts.

DT
I don't normally use choke on hot starts, just did it that one time to see if I could get it to start at all. But I will try not using any throttle on hot starts and see what happens.

2006 VN750 acquired March, 2010, 19,544 miles
Currently 20,147 miles (5/1/2010)
Splines lubed
R\R relocated
Deka MF AGM ETX15L
Iridium spark plugs
Pirelli MT66 tires 110 front 150 rear
Speed bleeders
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post #9 of 33 (permalink) Old 04-26-2010, 08:11 PM Thread Starter
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Today my bike acted like it was running out of gas well before I would normally need to switch it to reserve. The meter wasn't on Empty. I switched it to reserve anyway, and went to the nearest gas station and topped it off. It only took 2.28 gallons to fill up which means it still had 1.32 gallons in the tank.

2006 VN750 acquired March, 2010, 19,544 miles
Currently 20,147 miles (5/1/2010)
Splines lubed
R\R relocated
Deka MF AGM ETX15L
Iridium spark plugs
Pirelli MT66 tires 110 front 150 rear
Speed bleeders

Last edited by Mac84; 04-26-2010 at 10:10 PM.
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post #10 of 33 (permalink) Old 04-27-2010, 02:50 AM
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I have had this happen to me on several different bikes over the years.
Your carbs need to be cleaned because it sounds to me that the pilot jets are plugged.
The hole in these jets are VERY small and it's easy for them to get plugged up.

The "give away" symtom is when you said you had to give full or nearly full throttle and even choke.

Maybe this magic Seafoam just may work to clean them. It would be a good test for this stuff.

I never heard of Seafoam before joining this site and from what many have said.......I guess it does work.
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