Okay, I think I am finally beat!! - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
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post #1 of 21 (permalink) Old 03-11-2007, 08:09 PM Thread Starter
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Okay, I think I am finally beat!!

I can not get this thing to run right. Been through a dozen different jet, needle combinations and still have a bad mis-fire, miss, stumble at about 6200 rpm under wide open throttle only.

Currently running 40/140 F&R and needle on the top notch, screws about 2.25 turns out. All mods in my sig.

Do not know what to do except quit and start saving my pennies for a new bike.

Can't say I didn't try.

Jon

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post #2 of 21 (permalink) Old 03-11-2007, 08:28 PM
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I know you're gonna smack me over the internet for this , but what are your temps running down there now? What you're describing is exactly what my shop guys said would happen with the stock airbox, etc. removed - that a few changes in degrees or moisture content, and the bike would need to be rejetted again to run right. The stock set-up is "okay" for roughly 40-90 degrees - not necessarily perfect in that range, but "good enough" across the divide.

You still have your airbox and filters? And all those lovely annoying hoses? I seem to have ordered a few too many clips for the larger hoses - my suggestion would be to go back to stock (I'll send ya however many clips you need), and see how she runs. If it's still crummy, then it's something else with the bike.

But, seriously, absolutely everything I've read and heard about removing the stock breather system is "trouble." The pods look great, and are much easier - on face - to work with; just not over the long haul.

Okay, you can smack me now. But that's my penny's worth.

C
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post #3 of 21 (permalink) Old 03-11-2007, 09:08 PM Thread Starter
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Quote:
Originally Posted by Crobins365 View Post
I know you're gonna smack me over the internet for this , but what are your temps running down there now? What you're describing is exactly what my shop guys said would happen with the stock airbox, etc. removed - that a few changes in degrees or moisture content, and the bike would need to be rejetted again to run right. The stock set-up is "okay" for roughly 40-90 degrees - not necessarily perfect in that range, but "good enough" across the divide.

You still have your airbox and filters? And all those lovely annoying hoses? I seem to have ordered a few too many clips for the larger hoses - my suggestion would be to go back to stock (I'll send ya however many clips you need), and see how she runs. If it's still crummy, then it's something else with the bike.

But, seriously, absolutely everything I've read and heard about removing the stock breather system is "trouble." The pods look great, and are much easier - on face - to work with; just not over the long haul.

Okay, you can smack me now. But that's my penny's worth.
Cindy -

You have said this before and if there weren't several members here and over on the Yahoo group with successful shave endeavors, I would agree.

It's in the low 80's here at peak.

Perhaps there's a softail custom in my near future.

Jon

93VN750, under re-construction
vn750.com Member # 828

Rick's Stator and R/R
MF AGM Battery
Coastered
Degoated
Shaved & Jetted
Iridium's
MAC Tapered Staggered Pipes
Battery/Temp/Clock Gauge
Stainless Steel Brake Lines
Dunlop D-404's
23,XXX miles and holding pending gasket change (underway!!!)
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post #4 of 21 (permalink) Old 03-11-2007, 11:36 PM
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Don't know if this would be of any help, but it's a graph of what jet does what with the carbs....
Even if it doesn't help, wouldn't be bad to have.
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AKA: Tim & 'The Adventure Cycle' VROC #24567, NEVROC, SteelCity VROC


"When life throws you curves,
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post #5 of 21 (permalink) Old 03-12-2007, 07:16 AM
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Quote:
Originally Posted by 93VN750 View Post

Perhaps there's a softail custom in my near future.
NO!!! Not a softail custom!!!! I don't know why I said that - I hear HD has taken care of its issues from years past.

How much info do you have such that you can create your various jet combos and needle settings? That is, do you have dates when you altered the arrangement, and then notes on how the bike was running? And when it started running poorly and you changed the settings again? If so, I'd go back and take a look at temp and humidity readings for those days -seems like you had a period where the bike was running really well at 40/140 (can't rem how many shims you had under the needle then), and then when it started running poorly, you'd hit a cold spell (37 degrees, if I remember right). It could be that you have to find the combination - like stock - that covers the widest range of temps/conditions that's good enough (i.e., maybe occasionally optimal, but most of the time "ok").

I also had someone tell me that the best way to sync the carbs is at WOT. Been afraid to try that on Orleans, but since you're having trouble at that end of the curve, maybe give it a sync there and see what happens.

C
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post #6 of 21 (permalink) Old 03-12-2007, 10:07 AM
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Quote:
Originally Posted by 93VN750 View Post
Cindy -

You have said this before and if there weren't several members here and over on the Yahoo group with successful shave endeavors, I would agree.

It's in the low 80's here at peak.

Perhaps there's a softail custom in my near future.

Jon
Sorry to hear you're having these problems, Jon, but can I make a suggestion if you do start shopping around.....VN1600....awesome machine!

Steve in TX
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post #7 of 21 (permalink) Old 03-12-2007, 10:42 AM
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Jon,

One thing I nothiced that is different between your mod and most the posted mods is the setting on the needle. You said that it is at the top notch but everyother thread I have read doesn't mention notches. They used the factory needle with two shims on each needle. Also the fuel mixture was set at 2-1/2" turns.

This maybe nothing but it was something that stuck in my mind as I rear the post.

Jamie B.
Ankeny IA
88 Vulcan 750 with 40K+ miles
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post #8 of 21 (permalink) Old 03-12-2007, 11:01 AM Thread Starter
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Quote:
Originally Posted by JamieB View Post
Jon,

One thing I nothiced that is different between your mod and most the posted mods is the setting on the needle. You said that it is at the top notch but everyother thread I have read doesn't mention notches. They used the factory needle with two shims on each needle. Also the fuel mixture was set at 2-1/2" turns.

This maybe nothing but it was something that stuck in my mind as I rear the post.
Jamie, I am looking to see if I can acquire some stock needles as this is about the only thing left, short of C4.

Jon

93VN750, under re-construction
vn750.com Member # 828

Rick's Stator and R/R
MF AGM Battery
Coastered
Degoated
Shaved & Jetted
Iridium's
MAC Tapered Staggered Pipes
Battery/Temp/Clock Gauge
Stainless Steel Brake Lines
Dunlop D-404's
23,XXX miles and holding pending gasket change (underway!!!)
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post #9 of 21 (permalink) Old 03-12-2007, 11:31 AM
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Jon I still have my stock needles if ya want 'em !!!!
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post #10 of 21 (permalink) Old 03-12-2007, 11:39 AM Thread Starter
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Quote:
Originally Posted by artman View Post
Jon I still have my stock needles if ya want 'em !!!!
Absolutely!

How much do you want for them? PM me with details.

I have tried everything else, EXCEPT stock needles. If it still doesn't work with the stock needles, then it's time for the C4.

Jon

93VN750, under re-construction
vn750.com Member # 828

Rick's Stator and R/R
MF AGM Battery
Coastered
Degoated
Shaved & Jetted
Iridium's
MAC Tapered Staggered Pipes
Battery/Temp/Clock Gauge
Stainless Steel Brake Lines
Dunlop D-404's
23,XXX miles and holding pending gasket change (underway!!!)
93VN750 is offline  
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