has anyone successfully replaced the stock airbox with a k&n lunchbox? or pods?

[GTiRolla]

I'll post some more details about mine when I can, but I have a 2008 with box filter, Iridium plugs, Yoshi slip-on and its been rejetted.

I got the local guys to check my tune on the dyno whilst doing a service and new rear tyre and luckily enough was pretty spot on


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[Mr. BIGGZ]

Bumping this thread looking for more feedback. I've checked the wiki and read countless posts about jetting, but I still see a lot of posts like this on where people can't seem to get the bike to run right with the lunchbox, reject and an exhaust.

Does anyone have a good running setup with a lunchbox, rejet and slip on? 

In case you were still working on this....

K&N lunchbox filter and new exhaust.
Total beginner's luck, but I was lucky to get it spot on with 20 / 60 / 147.5 jets following Buddha's advice.  Also 2.5 turns out on the air mixture screws; 2 washers on the jet needle
http://gstwins.com/gsboard/index.php?topic=70953.0

The bike idles well, and seems to have even power across the throttle curve

Hey Endopotential,

Saw your build thread and your bike looks pretty cool. You don't see too many GS500s in our neck of the woods, let alone a custom one. I really like the paint scheme, your tail section, and how clean your bike looks. I've been offline lately with grad school obligations, but worked on the GS this weekend. I finally got around to installing my R6 shock, Lunchbox and rejetting. Being that you're in CA too, what did you do with all of the extra hoses? Like the PAIR hose and the Evap box under the battery?

I have hoses hanging everywhere and don't know if it's okay to remove PAIR hose or to plug it? I jet to 22.5, 65, 147.5 with the lunchbox and the slip on exhaust. Feels rich and I have a tough time getting it started. The bike dies with choke, unless it's warmed up and I need to give it throttle to start and keep it from dying.

Anyways, looking forward to hearing from you.

[Endopotential]

Biggz - PM me if you want to drop by and work on your bike.  I'm over in Pacifica.

Your jetting does seem to be richer than mine, esp if you're running a slip on.  I cut off the distal half of my pipe and welded on a pretty free flowing exhaust, so that's even more of a difference.

And if you're running rich, doesn't quite make sense why you'd have to give it more throttle to keep it running...

One thing I learned on my bike - the metal bar linkage on the front of the carb that controls the chokes can bind easily.  I had to put some plastic washers on mine to level them out and make the whole system slide easily back and forth.  If the system binds, you may not be in the choke on/off state you think you're in.

[mr72]

Feels rich and I have a tough time getting it started. The bike dies with choke, unless it's warmed up and I need to give it throttle to start and keep it from dying.

So, if I can parse what you are saying:
- it won't start on choke
- it dies on choke unless the engine is warmed up
- it requires throttle to start and run until it's warmed up

My questions:

when it's warmed up, does the idle speed increase when you turn on the choke?

have you checked the plugs? what do they look like?

did you recently replace the pilot jet?

This is opposite of how it should work, as I am sure you are aware... so I have to ask a really dumb question... are you sure you are turning the choke on and off in the right direction? Towards you is choke-on, and away from you is choke-off. I get this mixed up every once in a while.

If you verify you are indeed working the choke correctly, and indeed it is behaving opposite of normal, then I would think that it's rich when you start it and gets very lean when it warms up. To me this sounds like it could be either a vacuum leak, or a clogged fuel passage in the carbs.

I think your jetting is probably ok. I would go through the carbs looking for leaks and ensure o-rings are good, passages are clear, and then once you know there are no vacuum leaks or clogged fuel passageways then you should reset the idle mixture until it will start with the choke on (should be factory -2.5 turns) and go from there.