Getting to know my 800.... - Kawasaki Vulcan Forum : Vulcan Forums
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post #1 of 13 (permalink) Old 06-30-2016, 08:30 AM Thread Starter
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Getting to know my 800....

not new to motorcycling, per se, but its been 20 years, so maybe I am a newbie again. Just bought my 800, had to immediately put it in the shop to get a chain, carb, tires, etc, and finally got to ride it for a bit yesterday, and I have some observations that Id like to bounce off you guys/girls. It may just be me being neurotic, but Id like a second/third opinion.
first, I have V&H straight shots, came w/out baffles, but I installed new ones. the sound is awesome, but still a bit too loud. I guess I should put the fiberglass wrapping back on. I thought the baffles would reduce the amount of backfires upon throttle release, but i still get a bout 30 or so every time. this seems a lot to me. next is the apparent cutting out (misfires) of the engine ONLY at steady, relatively low rpm speeds, maybe the middle of 3rd gear. about every 6 seconds, it sounds like a cylinder fails to fire. a quick but noticeable cut with a very minor jerk. I have new sparkplugs and the carb is freshly cleaned/rebuilt. not sure this should be happening. or...do twins just sorta.....do that? anyway, any tips or advice you may have from your experience, things I need to check on/look for, please let me know. oh, and any ideas on reasonably priced saddle bags and floorboards? need those next. my legs are short. which brings me to the fwd kickstand. I feel like an oompa loompa every time I reach my leg out to get that thing. [email protected]! ~nrg(dave)
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post #2 of 13 (permalink) Old 06-30-2016, 08:58 AM
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hi, I'm going to comment on your 800 V&H pipes and still too loud, I have found that pipes come in 2 varieties, Loud and Stock Quiet, there is no middle, I had loud before , Cobra Dragsters and they were Loud, so I removed the baffles that came with those pipes and bought Quiet baffles, well they lowered the decibel dB about 4dB, now the rating on those pipes out of the box were about 106dB, and 4 less with Quiet baffles ended up being 102dB or maybe 100, I found them still too loud but better than 106dB and the Quiet baffles installed made adjusting the carb idle mixture screw so I ended up buying a ColorTune Gunson spark plug off ebay and used that to correctly adjust my idle mixture screw to stop the popping and backfiring thru the Cobra exhaust pipes. That is what you will need to do, with your pipes if you want to stop the backfiring out the exhaust on deceleration upon throttle release, you need to adjust the idle mixture screw, that should cure the backfiring and also any hesitation in 1st gear throttle up to 2nd gear, it will cure that also, if forget now if you need to turn the idle mixture screw clock-wise in or counter-clockwise out, in leans out the fuel mixture and out richens it. But if your are going to install quiet baffles then that is going to require more adjustment on that idle mixture screw in or out, not sure I forget which way now, but that is the cure, that idle mixture screw. What happens is the lack of backpressure on your back when you removed the V&H baffles is causing the backfiring due to a lean condition in the idle circuit, you need to give your bike more fuel by richening up the idle circuit
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post #3 of 13 (permalink) Old 06-30-2016, 01:04 PM
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Look at your vavle covers. If there is a hose between them with another hose "T'ed" into it and a vaccum switch by the petcock on the left side of tank, removing this and either plug the ports on the valve covers or connecting a hose between the 2 covers without a "T" should cure your decel popping. Checout this link for instructions. Afterburner or EPA Removal for the Kawasaki Vulcan VN800 motorcycle

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post #4 of 13 (permalink) Old 06-30-2016, 05:14 PM
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Picked up the Cobra boards used on here last year, not sure about the bags as they were on when I purchased my 2005
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post #5 of 13 (permalink) Old 06-30-2016, 08:39 PM Thread Starter
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ok, im doing the epa gas recirculation bypass, I mean fix. all went well except for the fact that apparently the gas is NOT supposed to continually flow out of the tank and mine does. I guess that means ill need a new petcock assemply? id imagine it will just dump gas into the filter forever. is this an issue? there is supposed to be a shutoff after a few drops, the video said.

anyway. I have a mystery hose on the back of the air cleaner. I plugged up the big one as described, but I forgot where the smaller, curled up one goes. I dont see anywhere obvious. any ideas?

p.s. I did try to upload a picture. it uploaded, got really big on the screen, now its disapeared. not sure what thats about...

Last edited by nrg2brn; 06-30-2016 at 08:41 PM. Reason: need to ask a question about my pic
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post #6 of 13 (permalink) Old 06-30-2016, 09:31 PM Thread Starter
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yep. sure enough. I just capped off that little hose, and tried to start her up, sure enough, she barely runs. definitely missed a vacuum hose somewhere. cant find it. back to the shop.
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post #7 of 13 (permalink) Old 07-01-2016, 11:19 AM
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Should be 3 hoses. The big 1 goes to the EPA stuff if I remember right. The middle sized one goes to the front of rear cylinder, this I believe is the crankcase vent line. The 3 and smallest one is a drain hose for excess oil that can accumilate in the filter and goes to a small plastic bottle in front of frame on right side.

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post #8 of 13 (permalink) Old 07-01-2016, 11:20 AM
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go get a new hose, it's the carb to tank petcock vacuum host, it's a 3/16" ID inside diameter, get about 12" of it and cut it to length, it goes directly from carb to petcock, if your petcock is dripping drops of gas when bike is off, the little spring in the petcock is weak and needs to be replaced or you can take the petcock off and take the spring out and pull on it a bit stretching it a bit and put it back in, there's a youtube on how to do this, or else you will need to buy a new petcock assembly, or else you don't have the hoses hooked up correctly, I think you got some hoses hooked up in the wrong place
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post #9 of 13 (permalink) Old 07-01-2016, 11:21 AM
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what exactly are you trying to do?
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post #10 of 13 (permalink) Old 07-01-2016, 11:47 AM
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listen up, just go get 6" of 1/2" ID inside diameter heater hose, cut it to length (about 4" and a little bit), and put that heater hose on both of the reed valve jug nipples, those jug nipples are at the top of each of the cylinders facing each other (there're at the top), and then throw that other stuff (hoses and gold valve) you got there in the garbage, you don't need it, I cut my heater hose with a razor blade, it makes for a fine cut but be careful not to cut any fingers
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