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78 1000 Air Filter Set-up

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Guest

Guest
I've read a few old articles about the old 1000's air box being too restrictive, but they do like a little restriction on the intake. I was thinking of leaving the plenum on and replacing the air filter box with a single exposed K&N high flow filter. Has anyone used this set-up? The bike still has the stock mufflers until next year. Will I need to rejet? Any recommendations? Also, I ride primarily between 4000-8500 ft. I live at 5200 ft. Should this be factored in?

Logic would say (my logic, at least) that it would be easier to tune the carbs this way as opposed to individual filters. The restriction would be even and consistent on all four carbs, and filter load would be consistent as well. Make sense?
 
Anytime you start screwing with the airbox you will have to rejet At 5K ft it is probably running rich anyway So it may be of benifit
 
That is one way many use to minimise, not eliminate, the need for retuning. The airbox is quite restrictive, and a bit of retuning will be need to get it right, although with stock mufflers there probably will not be much change as the other main restriction is the exhaust system. Without doing both ends it will probbaly just sound louder at the intake.

I run a 78 GS1000 with two oval K&Ns and slide carbs.
 
saaz said:
I run a 78 GS1000 with two oval K&Ns and slide carbs.
Click to expand...



What type/size carbs are you using? What jet size? How does she run?
Stock pipe? (sorry, I'm an info-holic) 8)
 
That air filter set up will significantly increase air flow and require larger main jets and raising the jet needles. Also some pilot fuel screw adjustments. Removing the two floatbowl vent lines will probably work better too.
 
If your going to do this I would highly recommend a 4 into 1 pipe upgrade. It is a better mod than the air filter by a little bit anyway and the two work well to compliment one another.
 
KEITH KRAUSE said:
That air filter set up will significantly increase air flow and require larger main jets and raising the jet needles. Also some pilot fuel screw adjustments. Removing the two floatbowl vent lines will probably work better too.
Click to expand...

Thanks for the response, Keith. With the bike having the stock main jets, and based on my altitude, what size jets would you recommend? And how much should I raise the needle?
 
Hoomgar said:
If your going to do this I would highly recommend a 4 into 1 pipe upgrade. It is a better mod than the air filter by a little bit anyway and the two work well to compliment one another.
Click to expand...

Yep, that's the plan. I need to sell some of my leftovers on the parts bike so I can buy a V&H Megaphone. As soon as I can afford it, that will be my next purchase.
 
I'll make some suggestions but re-jetting for the high elevation, the modified airbox and the stock exhaust isn't something I have much hands on experience with. I have some ballpark ideas but there would be a good share of guesswork here. Be prepared for some work.
I'd like to know first, what do you want out of this re-jet? More power?
I personally feel waiting for the V&H pipe is smarter than jetting twice. The V&H pipe WILL change the jetting again. I also don't recommend the modified airbox idea you're suggesting. I can see where it will save $ compared to buying 4 K&N pods and could save you more by not getting a jet kit, but the pods will increase power even more and there's a jet kit that's designed for use with these pods and the K&N pipe. There's never any promises, but the pod/pipe/kit combo could be easier to jet for and you will have more power than your airbox idea. If you're doing this for more power, go with the pods/pipe/kit.
If you simply can't afford the pods/kit and wish to stay with your idea, that's cool, I'll try my best to help you. But I still think you should wait for the pipe and re-jet just once. Hopefully, we can make the stock jet needles work (I think they will with that airbox idea). Do you have any other work to do on the bike while you save for the pipe so you're not "wasting" time? Valve clearance checks... Ignition tune up/timing...carb clean/rebuild? Of course, these things can cost too, but still need to be done/checked as a part of re-jetting. You'll also need a vacuum tool for the carb synch too, about $40.
Just remember, your time matters too, not just money invested.
Hope this helps you decide. What'll it be? :twisted:
 
Keith,
I greatly value your knowledge and expertise. And your time. Maybe I'm getting a little ahead of myself here. I will go through the other items on the bike first, and get the Megaphone. It makes sense to only re-jet once. The reason I was asking in the first place is because my filter box is no good, and I was anxious to ride it. :twisted: But I have a perfectly good 1150 to keep me happy in the meantime 8) and alot of other things I should do on the 1000. Thanks for your input. I'll take you up on some help soon.
 
78 air filter setup

78 air filter setup

How does the bike run if you take the metal lid off of the 2ndary air box? I'm assuming that you have a 78 1000E.
 
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