2.5 maybe 3 - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
From the gas tank to the carbs
All fuel system discussion

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post #1 of 6 (permalink) Old 05-26-2017, 10:23 PM Thread Starter
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2.5 maybe 3

I am having to pull my carbs again due to the nastiness of ethanol. I wanted to turn the bike over before trying to pull the carbs just to find out the bike was locked up but it wasn't. Anyway when I pulled the plugs on both cylinders they were black and I only had around 100 miles on those plugs so I knew that couldn't be right.

I always had this feeling that my bike was trying to flood out when trying to crank the bike after it had been running for a while and shut it off and tried to re-crank but it never would until it cooled off.

Now that I am looking at my plugs being black makes me think I was running too rich causing my bike to have too hard of a time to crank when I did a heated start. So when putting the carbs back on I am going to go with 3 turns instead of 2.5 or do you think I should go with 3.5 turns?

I am also going to do that contact point mod to hopefully increase the starting capability when it is hot. Just really want to hear some of your opinions?

Blessings!
Richard

Grace and Peace to you!
Richard
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post #2 of 6 (permalink) Old 05-27-2017, 07:45 AM
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Originally Posted by mrseedsower View Post
I am having to pull my carbs again due to the nastiness of ethanol. I wanted to turn the bike over before trying to pull the carbs just to find out the bike was locked up but it wasn't. Anyway when I pulled the plugs on both cylinders they were black and I only had around 100 miles on those plugs so I knew that couldn't be right.

I always had this feeling that my bike was trying to flood out when trying to crank the bike after it had been running for a while and shut it off and tried to re-crank but it never would until it cooled off.

Now that I am looking at my plugs being black makes me think I was running too rich causing my bike to have too hard of a time to crank when I did a heated start. So when putting the carbs back on I am going to go with 3 turns instead of 2.5 or do you think I should go with 3.5 turns?

I am also going to do that contact point mod to hopefully increase the starting capability when it is hot. Just really want to hear some of your opinions?

Blessings!
Richard
that is the majority of the issue in my opinion ( I suffered same problem, never had it after mod).

Not saying your not rich, as it sounds like you are, so opening the air bleeds may be a good thing

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post #3 of 6 (permalink) Old 05-27-2017, 12:44 PM
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Anywhere from 1.5 to 4.5 turns is pretty normal even on stock bikes. It can really vary by individual bike, not to mention the amount of wear on components, altitude, humidity, temperature, gas, etc.

It is NOT ethanol that is the problem. That's like vaccines and autism, or the wage gap. It's been debunked time and time again. Ethanol actually helps with fuel that has moisture in it. BTW, run 87 or 89, no higher. In any case, set the idle to factory spec and choose one cylinder to start with:
  1. Open/close the screw until it doesn't stumble.
  2. Close it just until it starts to stumble.
  3. Close it all the way to count the turns. This is the minimum you need on that cylinder.
  4. Open until it smooths out and keep going until it stumbles again, counting the turns. That's your max.
  5. Set it anywhere in that range depending on how you like to run. On the lean side is fine. Richening can help smooth the throttle transition if you have a flat spot or stumble at a low, steady cruise 45-55.
  6. Repeat with the other cylinder.
  7. Now that both cylinders are correctly fueled, you can accurately balance/sync your carbs. If they were set without doing your idle mixture, your balance/sync is probably off.
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Last edited by Hexadecimus; 05-27-2017 at 12:50 PM.
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post #4 of 6 (permalink) Old 05-27-2017, 04:13 PM Thread Starter
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Well then my carbs are set correctly. They don't stumble and the bike runs smoothly it is just hard to crank after it warms up. I don't like using ethanol gas as it eats up gas lines. I do small engine repair and I see that quiet often. I want to use marine gas but to get to that pump I usually have to sit there for a while before it is cool enough to crank again. But i am going to do that point contact mod to see if this will fix my hot starting issues. Then go from there.

Grace and Peace to you!
Richard
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post #5 of 6 (permalink) Old 05-28-2017, 08:50 AM
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Mine will start fine cold. After its warmed up, not so easy. It has been a plague to me my whole ownership with this bike. Several mods are available on this site. Bypass relay mod, Pickup mod, etc. I have yet to do any of those mods yet due to my laziness. But you may want to look into them. Seems these buggers all have the same issues.
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post #6 of 6 (permalink) Old 05-28-2017, 07:36 PM Thread Starter
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I have done the coil mod and also added to that mod in a sticky somewhere. So I am good to go there but I never did the pickup mod and I am hearing good results with this mod so that is what I am going to do next. But I don't understand the directions so I will study this a while before I attempt the mod. Hopefully I can figure out what they are saying before doing the mod.

Also going to do the rectifier mod and move it.

Blessings!
Richard

Grace and Peace to you!
Richard
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