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Discussion Starter #1
Hello fellas, new to the forum, i just purchased a kawa VN800 yesterday, its a 1995 has 39k Miles on it. she seems fine but i have 2 issues with it:
1- No neutral light when bike its on neutral and need to pull clutch to start her up.
Where can i find the switch and what you guys (more knowledge than me) can adv me.
2- Bike has Cobra exhaust, stock air filter and box; runs fine, cruised up to 90mph, pulls normal but smell like gas a lot, has no gas leak and backfire a lot when decelerating, smooth throttle , quick response.
Where should i start here?

Thanks, all comments are welcome, already planing to do an oil&filter and spark plug change.
 

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Discussion Starter #2
neutral switch sensor fixed, its located on the rear lower part of the engine, it looks like the oil switch one but smaller in case someone else use this thread as guide. my cable was unplug, plug it in and neutral light comes on, and no need to pull clutch to start.
i guess that with the carb i will need to open it, and re-jet it, any ideas which size of jet should i use for stock bike with cobra exhaust, and which in case i decide to add and aftermarket air cleaner? and where i can get the seal set? thanks
 

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If the bike is stock except for the exhaust then I would say just stick with stock jet sizing. If you go with an aftermarket air intake then you will need to re-jet for sure. Which seals do you mean? A carb rebuild kit?
 

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Discussion Starter #5
If the bike is stock except for the exhaust then I would say just stick with stock jet sizing. If you go with an aftermarket air intake then you will need to re-jet for sure. Which seals do you mean? A carb rebuild kit?
yes, all the gasket or rubber parts, thanks for the reply. i also notice that the inlet elbow on the car its broken and hose was putted there bend, i order one of the metal one to do the job and replacing it, just hoping its not starving on gas; i also notice that shoots flame out of the carb some times
 

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I can't say specifically if you need to re-jet with a K&N filter, but it sounds like your bike may be running lean. Backfiring is a common symptom of a lean condition. You could pull your plugs and see what color they are.
 

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Pull your carb and see if the jest are stock: main 135 & pilot 48; Also note how many turns out your air screw is--this is important so mark the screw and slowly turn it in clockwise and count the number or turns

If your bike has a stock intake and only a K&N you should be able to tweak it without changing jet sizes

Clean carb to PRISTINE condition while it is off even if it doesn't need it! Beans is right; backfiring is usually a lean condition--but we need to know what jet sizes you currently have and the position of air screw
 

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Also while your carb is off turn your petcock to ON and RES--neither position should drip ANY gas out of it--only Prime position should flow gas
Do you know if the valves were adjusted? If not you need to check their clearances w/39K miles on it
 

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Discussion Starter #10 (Edited)
done that, pet on ON or RES no gas dripping, carb is out, screw was 3.5 turn out, jets are stock 48 and 135, i just replace the elbow inlet for the gas because it was broken and the gas line was tight, didn't like how it looked, it was kind of restricting the gas in, i put also the screw on 2 1/4 turns from close and still have not put it back on the bike, i think i will get some bigger jets for it, just to be secure, what you guys think?
valve adjustment haven't done it, will replace the plugs as well in a bit, will post some updates, will try to look a shop here in Las Vegas NV who doesn't want a leg to have it done.

I also notice that my Needle-Jet is not stick because it have some lines where you can move the pin to rise it, it was on the second i move it to the third line.
 

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Discussion Starter #11
plugs are dark in the bottom but the part that its close to the center its like brownish, like tan color, also notice that my mixture screw its missing the rubber part, has the washer and the spring. ordered a new one with everything and also ordered a 140 main jet and a 50 pilot jet.
 

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Discussion Starter #12 (Edited)
well today i installed back the carb, with everything that i have, stock jets, and 2 1/4 turn mix screw, and she seems to runs good, still back fire a little, clean pulls, but still new part were ordered, waiting for those to see if that issue its over
 

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Discussion Starter #13
alright definitely the issue wasn't over, it still trowing fuel out of the carb when i accelerate and then let go, even open the carbs again everything was clean and good, installed the bigger jets and its doing the same thing, i can see the big amount of fuel every time i accelerate and when i let go fuel spill out of the carb (like with the old jets), i will put the upper needle on the last step today and check the plugs see how they look, but last time they were black (rich sing) and see if this help, any other solution for this, i just dont like the gas spilling out of the carb when bottle-fly its close and sometimes it ignite and create an explosion.
 

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When you say you can see gas coming out of the carbs what do you mean / where is it coming out?

Maybe the seal between the upper and lower halves of the carbs are not working?
 

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Discussion Starter #15
you know the valve have the needle jet inside, which lift up when you give throttle, and fuel come out of that little hole to the bottle-fly (this is how carb supposed to work) but you see a lot of fuel coming out of there, that the bottle-fly doesnt suck it all, and some times it ignite in there up the carb, i think i'm running to much fuel in my carbs. i will check my plugs and if they black i will lower down my mix screw and remove shim a step up on my needle.
 

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Have you checked your float valve and seat? It could also be possible that your float height is too high perhaps. You can attach a plastic tube to the drain tube and hold it up next to the carb and open the drain. The gas will go up the tube to the same level as what is in the float bowl. My other thought is it could be related to your accelerator pump.
 

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You do realize that once your rolling down the road the mixture screws are out of the picture.
They are ONLY used for idle.

If your carbs are too full its the float and seat settings or bad seat.
 

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Discussion Starter #18
yup, plug were black on the round part but super clean on the middle (lean) accelerator pump its working normal i know about that part, did the tube part on the bow its a bit above of the middle of the bow which its good, i think i was running lean instead of rich, because i lower down my needle and now its worse, and stall and backfires a lot more and now on the pipes, i have 2 sizes up on my jets both of them, so i will move my needle back down so it raises a little and hope this issue get solve, 2 1/4 turn and cobra exhaust with K&N filter.
 

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Discussion Starter #19
alright i put back the needle shims and it runs better now, it doesnt back fire often and no carb back fire, but sometime through blue flame out of the pipes, still dont understand how 2 sizes up on both jet wont solve the problem, when bike its not heavy modify.
 

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Discussion Starter #20
still having issues with this, bike popping when dec and getting into the lows rpm, any other adv or help
 
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