'08 vulcan 900 classic performance problems - Kawasaki Vulcan Forum : Vulcan Forums
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post #1 of 17 (permalink) Old 01-09-2019, 10:28 AM Thread Starter
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'08 vulcan 900 classic performance problems

It starts ice cold on the first try, runs beautifully .. until I hit 50MPH in high gear. It starts missing out horribly backfiring, sputtering and sneezing. Drop back to 50 or less and it smooths out very nicely.

It is in the hands of my mechanic and I stopped by today to see how it was going. He said "I'm pretty sure I know what is wrong. I suspect a FUEL SENSOR" I said "Great!! I will let you get back to work" and I left.

Been searching for a fuel sensor and don't find that exactly. I THINK he just picked a word out of his head ... thinking I would not know the right term from a wrong term.

Sooo, the question is ... assuming he meant some other term, what should I be looking for in your opinion? Trying to find it to get an idea of cost of part and where it is, and maybe how much work there will be to replace it.

I found something called

16126VALVE,AIR SWITCHING
16126-0746
$150.18

but I don't know with any certainty that is what he is talking about. Any help is appreciated in advance.
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post #2 of 17 (permalink) Old 01-09-2019, 12:57 PM
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Does the problem occur only in 5th gear or does it occur at about the same revs regardless of which gear the bike is in? Fuel sensor - I would ask the mechanic for more info.

'07 Kawasaki Vulcan 900 Classic LT

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post #3 of 17 (permalink) Old 01-09-2019, 01:05 PM
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Sounds like your carbs are out of tune a bit. I had the same problem

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post #4 of 17 (permalink) Old 01-09-2019, 01:46 PM Thread Starter
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Quote:
Originally Posted by Hot Cruiser View Post
Does the problem occur only in 5th gear or does it occur at about the same revs regardless of which gear the bike is in? Fuel sensor - I would ask the mechanic for more info.
About the same rpm in any gear. Yes, I could ask the mechanic what he meant,... but thought I MIGHT get a calculated answer here.

Last edited by WacoJohn; 01-09-2019 at 01:51 PM.
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post #5 of 17 (permalink) Old 01-09-2019, 01:49 PM Thread Starter
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Quote:
Originally Posted by jaruck View Post
Sounds like your carbs are out of tune a bit. I had the same problem
Thank you. This bike is fuel injected. No 'carbs', ... right???
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post #6 of 17 (permalink) Old 01-09-2019, 10:26 PM
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Quote:
Originally Posted by WacoJohn View Post
It starts ice cold on the first try, runs beautifully .. until I hit 50MPH in high gear. It starts missing out horribly backfiring, sputtering and sneezing. Drop back to 50 or less and it smooths out very nicely.

It is in the hands of my mechanic and I stopped by today to see how it was going. He said "I'm pretty sure I know what is wrong. I suspect a FUEL SENSOR" I said "Great!! I will let you get back to work" and I left.

Been searching for a fuel sensor and don't find that exactly. I THINK he just picked a word out of his head ... thinking I would not know the right term from a wrong term.

Sooo, the question is ... assuming he meant some other term, what should I be looking for in your opinion? Trying to find it to get an idea of cost of part and where it is, and maybe how much work there will be to replace it.

I found something called

16126VALVE,AIR SWITCHING
16126-0746
$150.18

but I don't know with any certainty that is what he is talking about. Any help is appreciated in advance.

Could be as easy as the spark plug being loose.
Click image for larger version

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ID:	226460
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post #7 of 17 (permalink) Old 01-09-2019, 11:53 PM Thread Starter
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Quote:
Originally Posted by Du-Rron View Post
Could be as easy as the spark plug being loose.
Attachment 226460
Thank you! Just the kind of thing I was looking for.
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post #8 of 17 (permalink) Old 01-10-2019, 10:41 AM
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Does the FI light come on when it does this? No FI light, then most likely (not impossible) a fuel injection issue.
Tell them to do a charging system voltage check. Might be vibration related.
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post #9 of 17 (permalink) Old 01-10-2019, 12:18 PM Thread Starter
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Originally Posted by sfair View Post
Does the FI light come on when it does this? No FI light, then most likely (not impossible) a fuel injection issue.
Tell them to do a charging system voltage check. Might be vibration related.
This help and support is getting better by the minute. Thank you for the comment.

To be honest, I just downloaded the service manual for this bike. Anyone who can effectively work on one of these could probably launch a space shuttle. I FEAR this may be way over the head of my mechanic. He's good and has done work on other of my bikes but I have my doubts now that I see what all could be involved. The freekin manual is 500+ pages. Apparently Kawasaki is an exceptionally technical brand.

I am SURE he is not Kawasaki certified. Just removing the fuel tank by the book has some requirements I would have never known about. Personally, I think the odds of his getting this straightened out are slim. I really do not want to offend him ... so I guess I just have to wait until he gives up or succeeds.

Last time I rode it, I do not recall any FI light coming on.
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post #10 of 17 (permalink) Old 01-10-2019, 12:34 PM
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If you or your mechanic have any questions, post back.
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