Help needed with repair - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 24 (permalink) Old 12-24-2009, 06:19 PM Thread Starter
 
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Help needed with repair

I am at wits end with my sons bike. 2003 Vn750
I had it up on the lift when my buddy came over and we talked about a small miss at idle.
Unfortunately I decided to try and correct it with my limited knowledge of mechanics. I am getting better though (except for this time).

The bike does have after market pipes with no goats belly. Not sure what type they are.
I decided to eliminate the anti pollution nightmare and removed the lines and capped the ports as described.
The 5/8" line that runs from the breather under the tank was plugged as well. The 1/4" line that runs down the bottom was as well.

I drilled out the caps for the "air" mix.
The bike seemed to run well. Took it for a ride and liked it.
I added some K&N filters and since then I seem to have a lot of backfiring. I have removed the filters and I still get the backfiring.It is only on the left side that has the shorter pipe.
I'm going nut trying to figure this out. He is home for a couple of weeks and wants to ride. Right now i feel like I have blown it and and after a day of messing with it....I got nowhere?

Can it be the filters? K&N says no re-jetting required....sales pitch?
Stock cleaners are toast so re-install is not possible...foam was shot. Bike ran okay before though.

Help!

Which is what I will be doing....chugging that is.
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post #2 of 24 (permalink) Old 12-24-2009, 06:44 PM
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i was told with K and N and aftermarket pipes, the air mix should be as follows
2 3/4 turns out after you totally tighten them.
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post #3 of 24 (permalink) Old 12-24-2009, 07:10 PM Thread Starter
 
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Quote:
Originally Posted by luigit View Post
i was told with K and N and aftermarket pipes, the air mix should be as follows
2 3/4 turns out after you totally tighten them.
Thanks,
I have tried that and everything in between. Just can't figure out why it is the left side only. I did read about the filter oil being applied too heavily. I seem to have it running out of the filters and will clean them and re-apply.
Did the carbs suck it in? Heck i don't know anymore
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post #4 of 24 (permalink) Old 12-24-2009, 07:30 PM
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sounds like too much oil... and too lean on the rear carb... turn the screw in all teh way then back out 2 1/2 turns... should be very close to gone at this point... keep backing out the screw untill miss is completely gone
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post #5 of 24 (permalink) Old 12-24-2009, 07:37 PM Thread Starter
 
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Thanks for the reply,
I have tried that. I can't understand why my screw go so deep I can barely get a small driver on it and seems to go out as far a 5 turns + without falling out? I took the lead cap off, that is the only screw for each carb with a lead cover I assume?

I saw about oil in the air box? Is there enough vacuum to suck it up there....the filter oil that is.

Thanks again
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post #6 of 24 (permalink) Old 12-25-2009, 08:13 AM
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yes there is enough vacuum to suck the oil that deep...i would clean the filters and reapply a LIGHT coat of oil onto the filters, adjust the carbs to 2 1/2 turns out then start from there on the carb adjustments.
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post #7 of 24 (permalink) Old 12-25-2009, 08:53 AM
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Pull the rear plugs and see what color they are. If they are clean and white. Too lean. Black too rich. dark eggshell is about right.

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post #8 of 24 (permalink) Old 12-25-2009, 09:28 AM
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BTW an exhaust air leak can also cause the popping.Check your connections from the jug back.

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post #9 of 24 (permalink) Old 12-25-2009, 10:33 AM Thread Starter
 
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Thanks again guys/gals?
The plug is definitely running rich...wet when pulled. After a good nights sleep I thought about pulling the filters and applying a light coat of oil....as mentioned here.
It is very heavy on the filter as it was a nozzle type applicator (not spray).

I really do appreciate the help and will hope these recommendations work...now if the wife will let me sneak away and try????
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post #10 of 24 (permalink) Old 12-25-2009, 06:16 PM Thread Starter
 
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I have one question left before I set the bike on fire and throw it in the lake....

I have tried every combination of settings etc. I can think of.
When I disconnected the anti pollution hoses the main line that comes for the air chamber was plugged (by me). I am wondering if that is messing with the air flow as it seems to be air related.

It will run pretty well without air filters now but as soon as I put them in I get a lot of backfiring.

Should I have left that hose unplugged?

Thanks in advance.
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