Lunchbox with stock exhaust - am I crazy?

[badguy]

It's been a little over a year since I started riding, and I finally rode some bikes other than mine, so I now have enough experience to realize that my bike isn't running as best as she could.  I searched the forums here for rejetting advice and decided that I'd go with the 40/147.5 setup.  It seemed like she was bogging down at about 2/3 throttle to WFO, so last week I took out a washer on each needle (there were two on each) and not it's just WFO that's giving me issues.

Anyway, I went into a local dealer a little while ago and asked for a pair of 140 main jets.  (This was before I pulled a washer from each needle by the way)  The guy behind the counter mentioned that he normally works in the service dept and asks what I was using them for, maybe he could help.  When I told him my situation and what size the stock jets were, he looked at me like I had a gnome with a misshapen head growing out of my face and proceeded to tell me that I NEED to get a jet kit and that a 140 was WAAAY too big.  I said "but they don't make kits for stock exhausts," and he almost lost it.  Apparently I'm an idiot for believing anyone on the internet and for thinking that a lunchbox would do anything with a stock exhaust.  I mean, really, more air in - more air out.  It's that simple.  Right?  (Is your sarcasm meter pegged yet?)

Actually, that last part did kinda make me second guess myself, so I ended up walking out emptyhanded.  I don't have the money to spend on an exhaust right now, so I let him think he was a genius and said that I'd just go ahead and return my bike to stock until I could buy and exhaust and a jet kit like a good boy.  I feel like such a douchebag.  Whatever. 

What I'm getting at is, i don't really think that an aftermarket exhaust is going to be so much more free flowing than the stock setup that it'll make THAT big of a difference.  For what it's worth, a previous owner drilled four holes in the back of the exhaust, so I guess it's a little more free flowing than stock.  I'd love to get an aftermarket exhaust, but it's not in the cards at this time. (You hear that Jardine folks?  you know what to send me for my birthday...)  But still, anyone that wants me to spend $100 on a jet kit when I can do the same thing for about $30 can kiss my ass. "But the dynojet folks have already done the research...you'll never get it right!!!" he says...bite me.  Does anyone know what size jets they put in the jet kit anyway? 

Sorry for the rant, but I needed to get that out.  Long story short, do any of you folks who has been around these bikes for a while (dgyver comes to mind first) also think I'm crazy for wanting to do this with a stock exhaust?  Should I just hold out for a new exhaust, or is this all just a bunch of bullshit that I'm worrying about for nothing.  If you've actually read this far, thanks - I feel better. 

[coll0412]

Good Job!!!

JEt kits suck ass, and Dynojet kit is terrible

If he wont sell you the jets, then order them offline. Look up the rejet matrix in the FAQ to figure out your needs.

With that said, however, you will not free up much power with the stock exhaust still on there, and may make it a Buddha Loves You to jet

[The Buddha]

I have heard 145 ... but how bad is the bog ... and tell me this ... did it get better in winter (and dont tell me you live in florida) and get worse in summer ... summer to winter gap is about 1 jet size in most of southern US, 2 sizes in most of the north, and prolly 3 in alaska ... so if it ran well in winter ... and you're south ... then drop 1 size, if northern, drop 2 etc ... just a guess ... somewhere in there is your ideal main jet ...
You want me to dig through my odd collection and send you some ... whatever you use, you can like replace and send it to the next guy ... we'll start a "jet kit" like a valve adjustment kit ... Or start drilling the old ass 122.5's jets I have lying about
Cool.
Srinath.

[NiceGuysFinishLast]

I'm going to do a lunchbox/rejet with stock exhaust, until I can get a decent slipon (Buying an old srinath flange from someone.. need to find a can)

I don't think you're crazy. Just a rejet helps a lot, a rejet + lunchbox will do some good.

[The Buddha]

I'm going to do a lunchbox/rejet with stock exhaust, until I can get a decent slipon (Buying an old srinath flange from someone.. need to find a can)

I don't think you're crazy. Just a rejet helps a lot, a rejet + lunchbox will do some good.

The srinath flanges have a black market now ... its like in the year 1900 you could order heroin out of the sears catalog. Now its like got a gazillion bucks street value.
Like that right ... 
My first 2 batches were awesome. The round plates were offset torched and hand welded ... they fit well, exited high and overall were so freaking hard to make and very good cos it was all hand made on a bike ... the recent 2 were jigged and slapped together with end plates that were laser cut ... lost a lot of the old artisty thing. The first set had conical head bolts with countersunk bolt holes and thick plates for the can to bolt to ... cool sheite ... but mistakes and wasteage was insane as was the time it took on each. Mass production is better ... but again no one here melts over a Ford taurus ...
Cool.
Srinath.

[Turd Ferguson]

I had a lunchbox/rejet with the stock exhaust for 3 or 4 months, then added a higher flow exhaust can later.  Honestly...the can didn't really do anything by the seat-of-the-pants meter.  The lunchbox/rejet made a very noticeable difference.  It seems on these bikes that the intake is far more restricted than the exhaust.

No surprise that someone at the dealer gave you crap for doing it yourself and getting your information from an internet community.  They all pull that crap.  When I go into the dealership (rare...very very rare...) I give them very few details on what I'm buying the parts for, but I insist that I know what I'm talking about and know exactly what I want.  Bring in part #'s and don't leave without getting what you want!

BTW, Nick, you bought 147.5's for a lunchbox with stock exhaust?  I ran 137.5's with my lunchbox/stock exhaust set up and it ran extremely well.  Methink's you'll be way rich above 6k.

-Turd.

[NiceGuysFinishLast]

I'm going to do a lunchbox/rejet with stock exhaust, until I can get a decent slipon (Buying an old srinath flange from someone.. need to find a can)

I don't think you're crazy. Just a rejet helps a lot, a rejet + lunchbox will do some good.

The srinath flanges have a black market now ... its like in the year 1900 you could order heroin out of the sears catalog. Now its like got a gazillion bucks street value.

Yeah, I'm getting it from an old member here, The Lazy Destroyer, along with a 15t sprocket, lunchbox, some jets, some plugs, and a few other misc. things for $50

BTW, Nick, you bought 147.5's for a lunchbox with stock exhaust?  I ran 137.5's with my lunchbox/stock exhaust set up and it ran extremely well.  Methink's you'll be way rich above 6k.

-Turd.

I most likely do the lunchbox/rejet till I have a can too, and that setup is what the wiki recommends for a slipon/lunchbox... That's why I ordered the larger ones, so I don't have to rejet twice (and pay for a rejet twice).. and if they're too big then, I'll swap em..

[Turd Ferguson]

I most likely do the lunchbox/rejet till I have a can too, and that setup is what the wiki recommends for a slipon/lunchbox... That's why I ordered the larger ones, so I don't have to rejet twice (and pay for a rejet twice).. and if they're too big then, I'll swap em..

Good thinking!  You'll love the jets you're getting.  Everyone who has that set up (*ahem* Dave's old bike *ahem*) with lunchbox/exhaust loved how the bike ran.

[/threadjack]

[NiceGuysFinishLast]

Everyone who has that set up (*ahem* Dave's old bike *ahem*) with lunchbox/exhaust loved how the bike ran.

Well damn.. now I just feel like an @$$hole.. fortunately, dave's bike will be paid off with my next check, this friday. I think.

[Turd Ferguson]

Well damn.. now I just feel like an @$$hole.. fortunately, dave's bike will be paid off with my next check, this friday. I think.

Are you paying off his deductible?  You're a good man, man!

Wait... [/threadjackagain]

[LostDog]

BTW, Nick, you bought 147.5's for a lunchbox with stock exhaust?  I ran 137.5's with my lunchbox/stock exhaust set up and it ran extremely well.  Methink's you'll be way rich above 6k.

I made the mistake of trying to put 147.5 mains with that setup (lunchbox + stock exhuast) and my bike wouldn't run above idle. Now I'm using 140 mains, and I think it's still rich. I'd say 137.5s sound like the way to go.

[NiceGuysFinishLast]

Well damn.. now I just feel like an @$$hole.. fortunately, dave's bike will be paid off with my next check, this friday. I think.

Are you paying off his deductible?  You're a good man, man!

Wait... [/threadjackagain]

Of course I am, what kind of a dork would I have to be to not? If he hadn't had full coverage, I'd pay off the whole bike, if necessary (in many, many small payments ).. of course, if he hadn't, I probably would have never borrowed it..

[NiceGuysFinishLast]

BTW, Nick, you bought 147.5's for a lunchbox with stock exhaust?  I ran 137.5's with my lunchbox/stock exhaust set up and it ran extremely well.  Methink's you'll be way rich above 6k.

I made the mistake of trying to put 147.5 mains with that setup and my bike wouldn't run above idle. Now I'm using 140 mains, and I think it's still rich. I'd say 137.5s sound like the way to go.

Wait, the 140s are too rich with the stock exhaust or a slipon? Cuz my jets that I ordered are gonna go in with a lunchbox and a slipon

[LostDog]

Wait, the 140s are too rich with the stock exhaust or a slipon? Cuz my jets that I ordered are gonna go in with a lunchbox and a slipon

That's with stock exhaust.

[NiceGuysFinishLast]

Wait, the 140s are too rich with the stock exhaust or a slipon? Cuz my jets that I ordered are gonna go in with a lunchbox and a slipon

That's with stock exhaust.

Ok.. I'm saving the lunchbox/rejet until I can find a can for my flange to do a slipon too... Seems some think I only need a 145s with the can/lunchbox.. we'll see.. I can always swap em later if I need to..

[Forrest000]

I have no idea how it would run jetted with 147.5's,  lunchbox, stock exhaust. But, I did my can first, rejetted to the 147.5's, and my bike would barely run... with that said, most of the change has to come from the lunchbox.  With the lunchbox, Yoshi can, and jetted to 147.5 my GS is perfect.

[spc]

I'm just waiting for this guy I know to wreck his gixxer1000, then I'm gonna cannibalize whichever can isn't trashed (yep he paid cash so he wouldn't have to carry comp&coll, and it's a first bike, so it's just a matter of time, i just hope he doesn't hit the ground too hard, i don't want him hurt too bad just enough to knock some sense into his head)  Those short CF cans look awesome!!!!

[Wrecent_Wryder]

((

[badguy]

Thanks for the replies everyone!   I'm gonna call the dealership today and see if they have the 140s, since I've heard of people running anything from a 135 to my 147.5 and I'm not sure exactly how close I am at the moment.  I figure the 140s are a good compromise and will give me the best idea where to go next if it doesn't turn out to be spot on.  I was pretty sure that the stock intake was more restrictive than the exhaust, thanks for confirming that. 

[badguy]

Well, the dealer says they'd have to order them, I'm not sure why I thought they might have them in stock...I might call another place.

Or...Srinath - I just noticed your offer when I was looking back over the thread.  If you wouldn't mind, maybe we could work out details through PMs or emails?