04 Vulcan 750, Cranks for awhile until it turns over. - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 12 (permalink) Old 04-05-2015, 08:39 AM Thread Starter
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04 Vulcan 750, Cranks for awhile until it turns over.

My bike almost never likes to instantly turnover. I bought the bike last year with 2600 miles on it and now it has 6k. Only sometimes when the engine is warm does it turn over on first crank. Its really annoying and kind of embarrassing. What could be the problem? Thank you in advance!
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post #2 of 12 (permalink) Old 04-05-2015, 09:10 AM
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Does it backfire as well?

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post #3 of 12 (permalink) Old 04-05-2015, 09:20 AM
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My bike won't start (warm) if I crack the throttle any at all.

If it's cold, or warmed then parked 20 minutes, it needs choked to fire quicker. But cold, it takes several turns. After winter storage, many, many turns to get the fuel moving.

Even after sitting three days, it takes more than if it's started every day. Might be a combination of fuel evaporation and a vacuum petcock.

That's very low miles, so a lot of sitting. Any carb cleaning or Seafoam treatments been done?

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post #4 of 12 (permalink) Old 04-05-2015, 10:30 AM
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what type of plugs are u using if not ngk's that could be the problem
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post #5 of 12 (permalink) Old 04-05-2015, 11:05 AM
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What they said^

what kind of battery do you have?

And it be nice if your first post was a "Hello!" in the newbie check in forum.

We have no history on the bike, and what you've done to it other than put gas in it. You use regular fuel or premium? You using the choke?

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post #6 of 12 (permalink) Old 04-05-2015, 01:57 PM
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Quote:
Originally Posted by Unibeck View Post
04 Vulcan 750, Cranks for awhile until it turns over.

My bike almost never likes to instantly turnover. I bought the bike last year with 2600 miles on it and now it has 6k. Only sometimes when the engine is warm does it turn over on first crank. Its really annoying and kind of embarrassing. What could be the problem? Thank you in advance!
Hmmm, ......to me when an engine is cranking it IS turning over. It means the same thing. I believe what you mean is that the engine does not immediately start when you press the starter button and the starter motor starts cranking and turning the engine over.

KM please note he identifies his scoot as an 04 in the headline.

Unibeck, DO NOT take KM's inquiry about using regular or premium gas as a recommendation for using premium gas in the vn750. If your vn750 is hard to start, premium gas will only make it worse. Premium is higher octane to resist pre-ignition, so by definition it has a higher ignition temperature.
Ma Kaw recommends regular gas.

At your next fill add half a bottle of Seafoam fuel system cleaner/conditioner.
Thereafter add 2 or 3 ounces every 3rd or 4th tank full of gas, depending on how many miles per week or month you ride.

NGK are the usual brand of plugs installed in Japanese bikes at the factory.
IMHO NGK brand plugs are the best choice.

We usually advise upgrading to Iridium plugs when changing them out.
NGK Part Number DPR7EIX-9.
Also if you have a regular wet cell battery with 6 caps on top to add water, change it out for a Maintenance Free-Absorbed Glass Mat (MF-AGM) for more reliable starting.

Something like this Deka can be purchased locally too.
http://www.ebay.com/itm/Deka-ETX15L-..._Parts&vxp=mtr

In Canada we have some experience with long winter storage and cold starts. After several years trying different winter storage methods, I now store the scoot under a shelter with a full tank of gas with a quarter to half a can of Seafoam poured in and run long enough to get it into the carbs. I bring the MF-AGM battery into the house as I do not have a small amperage battery maintainer. The past two riding seasons when I got the bike out of storage, I gave it full choke and cranked the starter over for a timed 30 seconds then let it rest for a minute. The engine started after about another 5 seconds of cranking.

Through the summer when starting cold it needed full choke for the first start of the day at 4 am. Maybe half choke after sitting for 8-9 hours at work, it would start at the first touch of the starter button. Warm starts take little or no choke and would start at a touch of the button. My '91 currently has about 30 K kilometers (20 K miles) on the clock.

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Last edited by OlHossCanada; 04-05-2015 at 02:01 PM.
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post #7 of 12 (permalink) Old 04-05-2015, 11:28 PM Thread Starter
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Does it backfire as well?
Yes, it does. Not a lot though.
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post #8 of 12 (permalink) Old 04-05-2015, 11:30 PM Thread Starter
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Quote:
Originally Posted by Spockster View Post
My bike won't start (warm) if I crack the throttle any at all.

If it's cold, or warmed then parked 20 minutes, it needs choked to fire quicker. But cold, it takes several turns. After winter storage, many, many turns to get the fuel moving.

Even after sitting three days, it takes more than if it's started every day. Might be a combination of fuel evaporation and a vacuum petcock.

That's very low miles, so a lot of sitting. Any carb cleaning or Seafoam treatments been done?
No carb cleaning or Seafoam treatments. I would assume I should try the Seafoam treatment first and if that doesn't work cleans the carb completely? Also, what seafoam product would you recommend for a task like this? Thank you.
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post #9 of 12 (permalink) Old 04-06-2015, 07:38 AM
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Plain old seafoam in the red and white can.

2003 vn750
1988 Pontiac Trans Am (project/driver)
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post #10 of 12 (permalink) Old 04-06-2015, 05:12 PM
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I'm a complete newbie, both here and with the bike (around 1k on my 04), but here's something I found.

In both my vehicles (pickup and wifes suv), the engine starts after maybe half a second of cranking. To me, this is "how it should be" in my world.

When I first got my Vulcan, I found that I had trouble getting it to start. What was happening was that when I held the start button for my typical half-second, I'd let off and wonder why it hadn't started. Rinse and repeat this several times, and eventually it would start.

I found that it was as simple as just holding the dang start button for about an extra second. Since I started doing that every time, it always starts right up.

I tried this because reading through the manual, it states somewhere to "not hold the starter button for more than 5 seconds." I thought "huh, that's a LOT LONGER than I ever try to hold it for.

I know how stupid it sounds, but that was my experience. I don't know if its a trait belonging to all motorcycles, or just mine in particular (heck, maybe I need some seafoam!)

Here's how my scoot acts:

Cold: full choke, 1.5s crank, always fires up
Warm (ran into walgreens for a bottle of asprin): no choke, starts right up like it never shut off with a bare tap of the button
Cool (~15-20 cooldown): no choke, just a dab of throttle, 0.5s crank, starts right up with a growl

I've found if I don't give it a little gas or try the choke when its just cool, it doesn't like to start. I suspect this would be fixed by the pickup coil mod or relocating the R/R

Last edited by bbrass67; 04-06-2015 at 05:18 PM.
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