how to tell if the airbox is from 600 or 750/1000 : Suzuki GSX-R Motorcycle Forums: Gixxer.com

**fastboatster** · 08-06-2012, 08:47 PM

Well, no matter what I did to my project bike, it still kinda runs rough. However, when I did a couple of tb syncs, every time I did it it ran very good with no airbox on and sounded quite healthy and, should I say, promising. But once I install and airbox and go for a test ride, it's a disappointment - i.e, lumpy idle, poor start. That lead me to believe I might have an airbox from 750 or 1000 cause they just looks so darn similar. My question is how am I gonna be able to check if I have a correct airbox? I should note that as of now, i have K&n air filter in there, which came with it, it was cleaned and reoiled and has a correct part number.
I already checked parts fiche, p/ns for the airboxes are different, and so are the numbers for velocity stacks? btw, is it possible to convert airboxes by swapping the stacks?
P.S. btw, just in case, how can I tell 600's throttle bodies from 750 or 1000's, provided these gonna fit?

**fastboatster** · 08-07-2012, 12:08 AM

Alright, I lifted the tank, and I saw several numbers on the airbox:
Top:

which reads 35F0
Left side:

now oddly, on parts fiche, 750's airbox p/n ends in 35F0, too. I checked the airbox on my 04 600, and there it's 29G0 and part number also ends in 29G0.
Could someone with 600 please take look at the top of their airbox and see what's there?

**FlaGatorL** · 08-07-2012, 01:00 AM

The air box I don't think would cause your problems. Not plugging a sensor back up will or something to that extent. And you can measure the throttle bodies to see

Sent from my stupid cell de

**fastboatster** · 08-07-2012, 02:43 AM

sensors and hoses are connected, I double-checked. and it ran very good with no airbox, air intake temp and pressure sensors, but then it ran worse with airbox on and those sensors connected - and it always happens, not just this time.

**fastboatster** · 08-09-2012, 03:41 PM

Quote:

Originally Posted by FlaGatorL

The air box I don't think would cause your problems. Not plugging a sensor back up will or something to that extent. And you can measure the throttle bodies to see

well, that actually sounds reasonable. anyway, all my sensors are plugged in, and bike does it regularly. so maybe there's a problem with vacuum hoses or ca emission system. I need to find out if it's running lean or rich.
anyway, the symptoms are: rough idle, and it kinda sounds strange. i went for a ride few days ago, rode it for a few miles, parked it, got back in 20-30 mins, started it and it sounded tons better, not sure if it ran (and sounded) worse or better after I rode it back home for a few miles.
also, I didn't notice rpms "hanging" when closing the throttle, but didn't notice backfire either

I probably should take a look at the spark plugs and try to post a few videos here with my bike running.

**Travis V** · 08-09-2012, 03:55 PM

Tried taking the filter out of the air box?

**fastboatster** · 08-09-2012, 04:28 PM

Quote:

Originally Posted by TVanVliet

Tried taking the filter out of the air box?

yes, when I washed it, though it wasn't dirty at all. i still need to find out if it's rich or lean, though I guess it's slightly rich, though idle speed doesn't vary that much as in classic rich condition.

**fastboatster** · 08-10-2012, 01:59 PM

I took a couple of vids last night, sorry if it's too dark:
cold start, my camera sucks and doesn't pick up all the sounds, but it sounds a lot less smooth than my 04 600:

You Tube

next vid I took after I rode it for a few miles to the grocery store, left it in parking lot, came back and shoot this video:

You Tube

not sure if someone could tell anything from this videos, though.
on a side note, this morning when I was moving this bike to other parking space, I dropped it, and all could have been well, but unfortunately there was big piece of dead lumber, and tail fairing hit it first with all of the bike's weight, so it cracked even more. But I decided I'm not having a bad day because of that anyway. Maybe I can rattle can the entire bike later on in some wild colors, like hot pink and fluorscent yellow

**fastboatster** · 08-10-2012, 11:41 PM

looks like we have several problems, and tps (mis)adjustment was one of them. checked it today and it was way out of whack - literally had to turn it almost 15 degrees. runs a lot better and engine sound now similar to my k4), but there's still something else there. since throttle bodies on this bike were taken apart, i'm probably gonna check stps adjustment, too.

**fastboatster** · 08-11-2012, 12:57 AM

took it for a test ride, not much different. wish I had a gopro, that'd let you see and hear how it sounds when riding. i don't know, maybe it's normal for these bikes or something else is wrong, besides the efi (though vacuum hoses need to be checked)
has anyone watched these videos above and has some kind of opinion?

**-JK750-** · 08-11-2012, 01:09 AM

Sounds normal.

You could raise the idle a little bit. I keep mine at 1500rpm due to pair mod.

**fastboatster** · 08-11-2012, 02:00 AM

Quote:

Originally Posted by -JK750-

Sounds normal.

You could raise the idle a little bit. I keep mine at 1500rpm due to pair mod.

it kinda does, maybe I should try different camera though, cause mine doesn't pick up all the sounds, like i mentioned. i really wish i could post up how it sound when I'm on the the throttle, it doesn't sound like any stock 01-03 600s on the youtube

when cruising at 5-6k, it almost sounds like revs are not constant, and that's not my poor throttle control. well, I guess I have to pull the spark plugs, hopefully something will be evident there.
P.S. btw, can PAIR hoses introduce air leak into the throttle bodies? It's only small line which goes to the TBs which can do that, right? I think that i have to do away with CA emissions stuff just in case.

**fastboatster** · 08-12-2012, 10:51 PM

spark plug after 200 miles:

it was slightly wet when I pulled it out. Changed the sparkplugs but no improvement. I noticed that after i start the engine when it's hot it sounds good for some time, like 1 minute but then it starts to run rougher again. My theory is that when it sits and it's hot, and excess fuel evaporates, but after a while, it becomes rich because of excessive amounts of injected fuel.

**fastboatster** · 08-17-2012, 11:46 PM

so I checked the vacuum hoses today and found that one of the hoses which goes to the leftmost throttle body, is punctured. Pic after I removed it:

It was so obvious, i didn't even have to backprobe IAP sensor to see if my vacuum is OK. Fortunately, I bought some (blue

) silicone 1/8 vacuum hose off the ebay which was marketed at the tuner population who want to "decorate" their engine bay, I just cut it to length using old hose pieces as a template:

they had grey and black hose, but I bought blue one just for lulz. Now I need some fresh silicone hose for the PAIR valve and engine breather, do you think red would be cool?

anyway, now it runs better but obviously needs a TB sync again, because I was pretty much balancing it with vacuum leak. I'm also thinking about replacing CA emission hoses with (hot pink

) silicone

**fastboatster** · 08-23-2012, 05:16 PM

btw, does anyone know what symptoms would be caused by punctured evap hoses? and any other problems which can arise from ca emission system malfunction?

**GSXR Maori** · 08-27-2012, 07:12 AM

Your 600 airbox should have 39F on the bottom half and 35F on top. 35F is 750, they share the top. 40F is 1000 which is a little different.

**fastboatster** · 08-27-2012, 02:38 PM

yes, my airbox is from 600, so it's fine. however, I did find that one of my vacuum hoses had a leak and after replacement and subsequent tb sync, there's no more rough and uneven idle. however, my fuel pump is not in great condition, so I'm cleaning it right now - I saw a lot of powder debris in the fuel pump base, but fortunately, no rust.