So, from all the searches and matrices that I could find on jetting, I think I've come up with a good starting point for what I want. Please let me know if you guys think this will work out all right. All the matrices and searches I've done have come up with a very wide range of jet sizes, so I thought I'd ask directly for my application.
I'm not looking for more power necessarily (I'm still learning, and the bike seems fast already). I'm more looking to clean up all the clutter, and have it jetted properly, because I'm having some lean problems right now. So...
What I've narrowed it down to, to order for my 1996 GS500E (with about 40k miles) is
• K&N Lunchbox Filter
• 140 mains, 40 pilots, 1 washer, 2.5 turns out
• with Stock exhaust
Now, I'm at sea level if that matters, however I'm running lean, being stock right now. The ranges that I've found have been 135 mains through 147.5 mains and anywhere in between, and 0, 1, or 2 washers, and 2 through 3.5 turns out. I know a lot depends on so many variables, but I'm just looking to get as close as possible, then maybe move one jet size max if I'm off slightly. I know that you guys don't like to re answer jetting questions, but please help me out here. Thank you!
Jetting matrix ix crap. Take this for example,
I have 137.5s in my bike right now, yoshimura full exhaust, k&n lunchbox. Everything is in good working order.
The bike will still not accept full throttle under 8000 rpm without bogging to some degree (too rich).
Going down to 135s and should be set there.
Wow, so I may need to be at 130 or 132.5's. Now I'm really confused. Anyone out there with a good setup of jets that only has a K&N Lunchbox with everything else stock? I really want to get all my stuff ordered today, but now I have even less confidence with what I was going to order.
Quote from: quiktaco on September 24, 2007, 11:20:39 AM
Wow, so I may need to be at 130 or 132.5's. Now I'm really confused. Anyone out there with a good setup of jets that only has a K&N Lunchbox with everything else stock? I really want to get all my stuff ordered today, but now I have even less confidence with what I was going to order.
Where are you located in Orange County? For the K&N lunchbox, I would order it directly from K&N, I believe they have one of the best prices, and shipping is very cheap and fast (they are in Riverside).
Here is the link to purchase it. http://store.knfilters.com/search/product.aspx?Prod=RU-2970
As for the jets, I have been picking them up at Cycle Gear in Anaheim, they have a good selection, comes out to 6.44 with tax for a pair of main jets (Yes, you can buy them individually). The 40 pilots should be fine, you should be able to get those at cycle gear as well.
I'm in North Orange County (Westminster exactly). I was going to order the stuff online, but I might just go out to Cycle Gear.
Anyone with a good working setup out there?
Anyone with some experience on this setup? I really want to order these today.
I have a freshly oiled K&N lunchbox and jets that I would be willing to sell you. I recently took my bike back down to Stage 1 because I could never get stage 3 to run correctly. I have the Lunchbox (slightly dented from repeated removals/installations on the carbs, pairs of mains (140, 145, and 150s), a pair of pilots (40s), a bottle of K&N filter cleaner (2/3 full), and a can of K&N filter oil (over half full). Let me know if you want them. They're all in good shape (I don't think the dent in the filter hurts the airflow much) and will be cheaper than buying them all new. Not that it matters, but the 150's have one season of riding on them and the 140/145s have been barely used at all.
Also, for jetting I would refer you to this webpage as a starting point
http://www.motorcyclecarbs.com/Motorcycle_Carburetor_Jetting__W7.cfm (http://www.motorcyclecarbs.com/Motorcycle_Carburetor_Jetting__W7.cfm)
Let me know.
John
Thanks for the offer, but I ordered the K&N filter yesterday. I'm still really confused with which jets to get. I know I'll need the #40 pilots, but where should I start for the mains. The matrix isn't helping any. It's saying 147.5 mains with 2 washers and 2.5 turns out. Then from tons of searches I've seen ranges down to 135 mains. Please, anyone, let me know what to use. :icon_confused:
BTW, I think the matrix would be a great resource, and there looks like there was one thread to get lots of info, but it just seems that there isn't enough data. That thing needs to be updated with as many peoples setups as possible to narrow out the oddball setups, and get a pretty close guideline for what all the new comers should use(or at least start at).
I'd be glad to share my (though limited) experience rejetting. The #40 pilots is a no brainer. That makes your bike warmup faster. That's pretty much it.
The mains are what makes the bike run (or haul arse). I personally got to 127.5 and happy. Even though I ordered 125 (for my 1999, w/ stock filter/exhaust) but the dealership ordered the wrong ones. I found out only when the carbs were apart. So I put those in expecting to be too rich. To my surprise that's not the case. For one season now I ride just fine. No hesitation, surges, etc. Spark plugs look great. No smell of gas, no smoke, no nothing. Pulls better than stock. Huge :thumb:
Here's my observations about jetting (and I did read a lot). First - fresh stock airfilter. As long it's quite new the airflow is good. So unless you go to bigger than 127.5 mains you'll be fine with stock airbox.
Second thing is the air mix screws - even 1/4 of a turn makes a difference on my engine. . Sometimes the engine starts to act up loosing the "pull", or having a trouble around 5000rpm. (misteriously to me, no clue, just does it at times) and I had to play with the screws. Now I am 2 and 3/4 with the screws (matrix calls for 3 turns out). Voodoo, I know. You just have to experiment.
But most important parts of the puzzle are float levels and proper sync up the carbs. I think I got my levels spot on and sync'ed up the carbs just right (using that $5 sync tool you can find out about at this forum). Again "just right" as in "best effort". I think these are the biggest variables in the mix (pun intended). My one-size-too-much mains would have been rich if not for a bit lower floats levels. I think even +-1mm makes a difference. That's why everybody's saying about "the art of rejetting". You may be just out of luck (1mm off on floats, or something). And the bike will not run awesome (just OK and definitely better than stock, but not perfect).
Because of all that I guess so many people report great results with different sizes/washers/turns/cans/filters. There is no silver bullet, just guidelines. Every machine has its character after all.
Carbs are a naughty cranky thing in general, bikes or cars, or what-have-you. Just get the bike running the way you like, do not expect the perfection.
Those are just my thoughts and observations.
Peace.
P.S. I frankly don't know if washers are important. I put one under each needle and did not feel I need to change since.
dirt rider i would possibly be interested in your jet stuff. how much do you want for all of it?
i have a completely stock GS500e and i want to do the stage 3 rejetting as well as drop a tooth in front.
Quote from: nazgulnarsil on September 25, 2007, 11:37:30 PM
dirt rider i would possibly be interested in your jet stuff. how much do you want for all of it?
i have a completely stock GS500e and i want to do the stage 3 rejetting as well as drop a tooth in front.
Naz,
New price for filter, jets, and filter cleaner and oil; you're probably looking at around $80 - $85. I'll sell you my stuff for $50, and I'll pay shipping. The filter was just cleaned and oiled, then used for about 50 miles max before I decided to switch back to stage 1. Bad timing on my part, but could be good for you. PM me, or email me at otherguy_23@yahoo.com if you're still interested.
-John
PS - The filter (RU-2970) has about 4000 miles of use. However my bike did sit for a while and the filter collected some dust, so I cleaned and re-oiled it.
Quote from: slowinthestraights on September 24, 2007, 11:16:09 AM
Jetting matrix ix crap. Take this for example,
I have 137.5s in my bike right now, yoshimura full exhaust, k&n lunchbox. Everything is in good working order.
The bike will still not accept full throttle under 8000 rpm without bogging to some degree (too rich).
Going down to 135s and should be set there.
I have a 2000 GS with lunchbox and stock pipe. When I installed the K&N filter put 150 mains, and as my needles have 4 notches and a clip (they were in the 3rd noth from top to bottom originally) moved the clip to 4th notch to rise them, so they were as high as possible, but the bike ran completely rich, the pipe smelled to gasoline all the time, so I moved down to 145 mains, and later to 140 mains, and at some point put the needles' clip back to the original 3rd notch, the 140 mains seem to be OK, because the bike pulls hard all the way up to 10K RPMs, and mains are suppoused to control mid to high RPMs behaviour, however on full open throttle it bogged a little bit, so I read around and found that suppousedly the needle controls from low to mid RPM's behaviour. A few days ago after checking the plugs, blackish with very little carbon, decided the needle was yet too high, I put the needles' clip to 2nd notch, so the needle rests lower than they were when stock and so far the booging went away.
The trick here is that the bike stock and new did around 18 kilometers per litre, do the math at 1Km=1.6mi and 1gallon=3.8litre, but after the first jetting mileage went down to 13 km/l, and after later adjustments (140 mains and 3rd notch) went up to 15.5 km/l, so I still have to check the "mileage" with latest set up (140 mains and 2nd notch).
Another trick is I got jets for a car, i think they were for an old Nissan Sentra. Very much alike the stock ones but its body is a little bit smaller, they cost less than $2 each. However I don't think they make a big difference with bike jets, a hole is a hole.
Hope this helps you guys out...
Thanks TR, it seems that no matter where I start I'm going to have to do some tuning, and will probably have to change something in order to get it perfect. Doesn't seem like it will be too big of a problem as long as it's rideable after each change. I think I'm going to start at the 140 mains with 1 washer, and see if I can get it to run perfect with that. If not, I'll just have to change it. We'll see.