Bike runs like CRAP after a rain - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 28 (permalink) Old 08-01-2011, 10:08 AM Thread Starter
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Bike runs like CRAP after a rain

My bike sits outside, but under covered parking, so there is a chance it gets a little wet when it rains. The last 2 times we have gotten a good rain overnight, my bike runs horribly the next morning - very sluggish; backfires loudly, and not on deceleration like normal, but when accelerating or just going a constant speed; no power at all; lurches sometimes, like it is going to "catch" or something, but never does.Then, after work, when I go out and get on it, it runs perfectly.

What in the world is going on here? I mean, I have ridden motorcycles IN the rain, and they never ran this poorly. Does anyone have any idea of what may be happening here? And even more importantly, if there is some way I can avoid or remedy it?

And just to clarify a bit, it's not because it's cold - it runs fine in the winter. And it's not something in the carbs - only does this after it rains, and I run Lucas Oil injector cleaner (my preference over Seafoam) regularly.

Any advice or wisdom is greatly appreciated all


AZ Kev

Arizona Kev

1989 VN750
7800 orig mi when purchased Jan 2011
Turned 11,000 mi Nov 2011
Saddlebags
Taillight relocation kit
Chad's highway peg mounts
Emgo Pegs
Aftermarket mirrors
Dunlop D404's

Otherwise, all stock


"But it's a dry heat - like the inside of an oven"
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post #2 of 28 (permalink) Old 08-01-2011, 10:20 AM
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First place I'd look would be at the spark plug boots. Thinking maybe water is pooling down near the bottom and making the spark arc to that instead of all going to the cylinder. Maybe just a good look at the wires in general.

If it were an atv, I'd say put some dielectric grease on the boots at the motor and the ignition coils.

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post #3 of 28 (permalink) Old 08-01-2011, 11:09 AM
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Are you saying the bike still gets wet under covered parking?

Do you cover the bike overnight?

Is it possible there is water in the gas tank?

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post #4 of 28 (permalink) Old 08-01-2011, 11:37 AM
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Does your bike still have the ears? How are the filters? Moisture might be getting in this way too.


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post #5 of 28 (permalink) Old 08-01-2011, 11:41 AM
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Definitely sounds like your plug wires, boots or although rare, a coil. Are they the original wires? On an 89 I imagine they probably have some hairline cracking so when they get wet, even from condensation they will wreak havoc and cause all the things you're describing. Good luck.
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post #6 of 28 (permalink) Old 08-01-2011, 11:54 AM
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Quote:
Originally Posted by DavesVulster View Post
Definitely sounds like your plug wires, boots or although rare, a coil. Are they the original wires? On an 89 I imagine they probably have some hairline cracking so when they get wet, even from condensation they will wreak havoc and cause all the things you're describing. Good luck.
x2 on the plug wires and boots

JM2001

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post #7 of 28 (permalink) Old 08-01-2011, 12:08 PM
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Humidity can sometimes wreak havoc on electronics. X2 on plugs, wires and coils. Hope it's an easy fix for you.

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post #8 of 28 (permalink) Old 08-01-2011, 12:11 PM Thread Starter
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Thanks for all of the tips guys. I am thinking that plug wires may indeed be the culprits here, or at least worth looking at, as I am pretty sure they are they are the originals. I think the bike does stay fairly dry - mostly in fact - under the carport, but as Vulster mentioned - even just a little moisture might do it. That would also make sense as far as the bike running fine later when I get off work - because by then, everything has dried off.

My bike does still have the ears, and I am thinking it is probably a good idea to look at getting some new filters too, as I'm sure those are original as well.

I will try all that and let you all know how she runs after the next time it rains. Which, here in Phoenix, could be a VERY long time from now! Haha


Thanks again all : )

AZ Kev

Arizona Kev

1989 VN750
7800 orig mi when purchased Jan 2011
Turned 11,000 mi Nov 2011
Saddlebags
Taillight relocation kit
Chad's highway peg mounts
Emgo Pegs
Aftermarket mirrors
Dunlop D404's

Otherwise, all stock


"But it's a dry heat - like the inside of an oven"
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post #9 of 28 (permalink) Old 08-01-2011, 12:14 PM Thread Starter
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Oh - one more thing - by "boots", I am assuming you are all referring to the boots on the wires that actually connect to the top of the plugs, right? There aren't some separate things I need to look at...???

AZ Kev

Arizona Kev

1989 VN750
7800 orig mi when purchased Jan 2011
Turned 11,000 mi Nov 2011
Saddlebags
Taillight relocation kit
Chad's highway peg mounts
Emgo Pegs
Aftermarket mirrors
Dunlop D404's

Otherwise, all stock


"But it's a dry heat - like the inside of an oven"
AZ Kev is offline  
post #10 of 28 (permalink) Old 08-01-2011, 12:24 PM
If only it had 6th gear..
 
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Quote:
Originally Posted by AZ Kev View Post
Oh - one more thing - by "boots", I am assuming you are all referring to the boots on the wires that actually connect to the top of the plugs, right? There aren't some separate things I need to look at...???

AZ Kev
yup, they plug right on to the spark plugs. One thought on those air cleaners. the elements can really deteriorate and if they styart falling apart your engine will be sucking that crap in. Good idea to check them out. Hope it goes smoothly for you
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