Rejetting a stock bike '04f

[annguyen1981]

I'm taking my bike in for her 4K mile checkup in a couple weeks.

Does anyone have any idea as to how much it would cost to have the dealership rejet the bike for me?  I'm curious, but it's sunday night, and no one's open to call for pricing.

[fettcols]

I had it done before suzuki sold jets for the '04. And it wasn't at the dealership. I think it was just under 30 for jets and 150 or 160 for the jetting and dyno tune.

[annguyen1981]

OUCH!  A bit too high for me...  Oh well... Stock it is.

[fettcols]

I'm sure if you go without the dyno runs it would be a little cheaper. At the time it was pretty much a have to have thing because jets didn't come in a kit yet and the F model was a new thing.

[blue05twin]

You can order your jets from here www.sudco.com and do it yourself. I think I payed $12 + shipping for the mains, mid's and pilot.

[Alphamazing]

Just be sure to remember to order TWO pilot jets! I somehow managed to only order one when I bought my jets the first time. I need to rejet mine the right way though, because the jetting matrix is crap.

I think you should just bump the pilot jet up one size (to a #20) and leave the rest alone. GSes are rich in the top end anyways, so main jets shouldn't be an issue.

[mjm]

No GS before the '04 was ever rich on the top end in stock condition - They were all very lean for emmissions purposes. And, if you go with a K&N OR exhaust yours will not be either.

[Cal Amari]

Yeah, I doubt the later models were rich on top either; I don't recall seeing any posts about fouled spark plugs from people who own the stock newer models. I think Alpha saw one dyno readout for an OLD model GS and jumped to conclusions about ALL GS engines; as I mentioned in a different thread, I don't think what he saw was representative of a well-tuned GS engine, for a variety of reasons.

[Egaeus]

I'm taking my bike in for her 4K mile checkup in a couple weeks.

Does anyone have any idea as to how much it would cost to have the dealership rejet the bike for me?  I'm curious, but it's sunday night, and no one's open to call for pricing.

You mean there are people who don't do their own maintenance on this board?  For shame! 

[annguyen1981]

Well... Considering it's my first bike, I work full-time, and school part-time...  I don't even have any time for self-repairs on my car anymore.  And I LIKE working on my car.  Oh well

[TadMC]

x

[Alphamazing]

Yeah, I doubt the later models were rich on top either; I don't recall seeing any posts about fouled spark plugs from people who own the stock newer models. I think Alpha saw one dyno readout for an OLD model GS and jumped to conclusions about ALL GS engines; as I mentioned in a different thread, I don't think what he saw was representative of a well-tuned GS engine, for a variety of reasons.

I didn't take into consideration the valve clearances being properly checked, yes. But the GS engine hasn't been changed, so I assumed that the two engines would have similar outputs. The carbs were changed and added a mid-main jet, which I figured cleared up the mid range A/F ratio. I'll adjust my valves, pull the carbs and rejet back to stock, then hopefully get it dynoed, drop the K&N in again and rejet accordingly.

[Cal Amari]

THAT would be a welcome contribution; I can't wait to see those dyno charts. Please try to avoid doing all that work in the heat of the Texas summer; air temps, density, and humidity will be a joke. Some of the motorcycle magazines "correct" their results to approximate sea-level conditions, with a temp of 59F, barometric pressure of 29.92 inches of mercury, and a relative humidity of... OK, I can't recall the RH off the top of my head. I've read enough of your posts to know how thorough you'll be with this, so the results can tell us a lot. Of course, we have to keep in mind that your results might be typical for the newer GS models, with the improved carbs, but won't apply to the older versions.

I suspect that because of emissions laws, Suzuki will eventually be forced to fuel-inject the GS, or discontinue it. Our carbureted, air-cooled dinosaurs are probably doomed, but for now, we'll learn what we can, and have some fun in the process.

[Alphamazing]

Please try to avoid doing all that work in the heat of the Texas summer; air temps, density, and humidity will be a joke.

I missed the 3 days last week when it wasn't like that, sorry man! Austin usually isn't very humid though, so air density will be alright I think. I'll post the conditions which I dynoed it in so people can make their own judgements. I was also thinking of doing the "corrected" dyno run, but I'm going to have to find the conversion factors in order to do so.

Problem is, a dyno run will run about $60. I'm going to talk to the shop and see if I can talk them down to 3 for $60 or 2 for $60 so I can dyno stock, dyno lunchbox, and dyno to correct jetting.

[Cal Amari]

Not to be a technical bastard, but IIRC, air density is affected by temperature, not relative humidity, so cooler temps are the most important consideration. The closer to ~60F when you perform these tests, the more likely we'll be able to consider your results as representative of the breed, all other factors being within balance. I don't know the altitude of Austin, though it remains one of my all-time favorite college towns, after Boston, Heidelberg (Germany) and Amherst, though as long as it is less than ~1300 feet above sea-level, you'll probably get fairly typical results.

I've often considered installing the newer-design carbs on my GS, and now I'll finally see a dyno run that might help me make that decision. If you happen to acquire a set of stock carbs from the earlier GS model, that would be another informative dyno run, but not unless you hit the lottery between now and then...

[Alphamazing]

If you happen to acquire a set of stock carbs from the earlier GS model, that would be another informative dyno run, but not unless you hit the lottery between now and then...

I just sold my set from my '92 GS a little while ago. Bummer.

[fettcols]

After some digging this is the set up I was running.

Wileyco and a K&N drop in witout the restrictor.

20 pilots  62.5 Mids 132.5 Mains and 3 turns out on mixture screw.

[Wrecent_Wryder]

[4

[fettcols]

There are at least 5 variables, though, and probably six. Pilot, mid, main, idle screw, needle shim, and year (range). Scanning the posts, you're lucky if any one mentions 4 out of 6. Not easy data to work from.

I'll admit that I don't know a lot about carbs. It was new model at the time and there was even less information available back then. Matter of fact there wasn't very many F owner's in the forum back then. That's why I took mine to a pro...