AAARGH!!! I messed up - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 4 (permalink) Old 03-06-2017, 01:20 AM Thread Starter
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AAARGH!!! I messed up

After taking a good part of the winter to rebuild my engine, I'm getting ready to put it in the frame and just going over to see if I got everything and I noticed I made a BONEHEAD mistake. I took the time to mark everything and take pics and to be careful but I messed up. Checking where the breather tube should go I noticed I had the heads reversed. The breather is on the rear cylinder I cant believe I can be that stupid but I guess in desperation i need to ask: Will it matter if the crankcase breather is on the rear? Also I did replace the head gaskets and I come to the painful conclusion I will most likely be taking her apart again. Since I did not fire it up yet should I replace the head gasket again or will they still be ok? My guess is suck it up and replace, again. Anyone have any input?
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post #2 of 4 (permalink) Old 03-06-2017, 02:03 AM
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The breather should work the same there. Just put a filter in it. The crankcase is open under that cylinder also, so it will still vent. I put a long hose on mine and stuck it out in the wind.

Is this bike earshaved?

If not earshaved, you'll need to cover the hole in the airbox if you use a filter. Running a hose from the airbox to the rear cylinder might be tough.

2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
__________________________________________________ ____________
Repair Manual: http://www.mediafire.com/file/mj7z81..._Catalogue.pdf

Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf
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post #3 of 4 (permalink) Old 03-06-2017, 02:19 AM
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Only problem might be the clearances for the front/rear cylinders being off, but they could be fine as well.

Did this get new pistons and rings, or did the old pistons stay where they were in their original positions? Standard bore or overbore?

Does the crank turn smoothly by hand without any binding? (spark plugs out)

If you tear it back down .. I would probably re-use the head gaskets since they haven't been heat cycled, as long as they look ok.

2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
__________________________________________________ ____________
Repair Manual: http://www.mediafire.com/file/mj7z81..._Catalogue.pdf

Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf

Last edited by Spockster; 03-06-2017 at 02:23 AM.
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post #4 of 4 (permalink) Old 03-06-2017, 11:42 AM Thread Starter
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It is earshaved. The crank turns fine. I really dont want to tear it down again. Perhaps I can place the filter in the rear.

What I can see on the parts breakdown and compare what is in front of me, both heads look the same except where the breather tube is. The front shows the tube and the rear shows a plug in its place.

Also standard bore. Rings were replaced. Cylinder walls were honed.
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