Backfire after taking out evap - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 10 (permalink) Old 10-09-2013, 04:18 AM Thread Starter
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Backfire after taking out evap

Bought used 86 cheap not knowing how bad it was. Ran good but leaked about a qt of oil going to the grocery store and back. Rebuilt the engine and stripped out the CA evap. Marbled it, routed the hoses, and set the pilot screws to 2 1/2 turns. The one thing I didn't understand in the instructions was where it said to remove the small hose from the rear carb and plug the fitting on the carb????

Can anyone set me straight on that? (I routed the two air hoses from the carbs to the right ear but I don't understand the plugging the rear carb thing.)

The reason I'm asking is when I drove it the first 20 mi on a hard break-in there were no backfires. When I drove it the second time it was popping every time I decelerated.

Any ideas?

Ordinarily I'd try and figure it out but with failing health it was all I could do to get it running again (10 mos). At this point all I want to do is ride while I still can. All help would be much appreciated.
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post #2 of 10 (permalink) Old 10-09-2013, 04:38 AM
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I am going to assume your petrol tap is vacuum controlled. if this is the case then you have a small rubber vacuum pipe from the left carb going to the petrol tap. On the other carb you should have a mirror image of the same small nipple where the second vacuum pipe went to the emissions valve that you have removed, this is the one that now needs to be blanked off to prevent air being drawn into the carb. At the top of the carbs are the two slightly larger diameter float bowl breather tubes, these go to a "tee" and the single pipe goes into the right "ear" (cut the end at 45 degrees so it doesn't get blocked).

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post #3 of 10 (permalink) Old 10-09-2013, 05:03 AM
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the nipple faceing us with out the fuel hose is the one gibo is talking about
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post #4 of 10 (permalink) Old 10-09-2013, 07:45 AM
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I am going to assume your petrol tap is vacuum controlled. if this is the case then you have a small rubber vacuum pipe from the left carb going to the petrol tap. On the other carb you should have a mirror image of the same small nipple where the second vacuum pipe went to the emissions valve that you have removed, this is the one that now needs to be blanked off to prevent air being drawn into the carb. At the top of the carbs are the two slightly larger diameter float bowl breather tubes, these go to a "tee" and the single pipe goes into the right "ear" (cut the end at 45 degrees so it doesn't get blocked).
Petrol means gas LOL. I put a tub on the rear carb vacuum fitting (right side) and just pinched it off. The tube that ran to your right ear originally, is the one that needs the dead air and I ran it to one of the two crankcase filters in the verses. I put tape around the front half of that filter to block airflow. the front crankcase tube coming out of the front cylinder goes into the right crankcase filter. Hmm I should take some pictures noow that I think of it. I was a bit confused myself.

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Last edited by Goofyfoot2001; 10-09-2013 at 07:51 AM.
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post #5 of 10 (permalink) Old 10-10-2013, 07:58 AM
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Petrol does not mean gas, petrol is petrol and is the short form of petroleum spirit. Gas may mean many things, one of which may be gasoline (your quaint and endearing term for petroleum spirit). Please do not take this English lesson too seriously! Lol.

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post #6 of 10 (permalink) Old 10-10-2013, 08:04 AM
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Quote:
Originally Posted by gibbo View Post
Petrol does not mean gas, petrol is petrol and is the short form of petroleum spirit. Gas may mean many things, one of which may be gasoline (your quaint and endearing term for petroleum spirit). Please do not take this English lesson too seriously! Lol.
I enjoy these impromptu English lessons Gibbo. If you want to tear some of these people up use the word "fag' in a sentence ,as it is used across the pond




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post #7 of 10 (permalink) Old 10-10-2013, 08:35 AM
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I enjoy these impromptu English lessons Gibbo. If you want to tear some of these people up use the word "fag' in a sentence ,as it is used across the pond
Yesterday was 11 MONTHS since my last FAG!!!!!

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post #8 of 10 (permalink) Old 10-11-2013, 04:23 AM
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I tried one when I was 11 and it made me sick !

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post #9 of 10 (permalink) Old 10-27-2013, 01:02 AM Thread Starter
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Thank you. I guess it was routed wrong from the get go with the emissions on. They had both nipples teed into one tube and connected to the tap. It's no wonder I couldn't figure out what to cap off!!

Just to make sure I've got it right, there should be only one vacuum tube from the carb to the tap correct? Thanks for your help.
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post #10 of 10 (permalink) Old 10-27-2013, 01:06 AM Thread Starter
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Thanks for the pic. It helped me figure out what was wrong (I think). Knew the people I bought it from weren't the brightest bulbs on the tree but somehow they had it running!
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