Something for the good of the Forum,
Being new to the GS500 I didn't know it'd be so difficult to get upgrade parts. Below is the reply from Parts411.com on Sept 8, 2009 when I enquired about their offering a new batch of advancers for sale to we GS500 owners. Feel free to comment with any information concerning distributors that you're aware of. Thanks!
To:
Subject: Regarding Your Contact Request from 9/7/2009 8:57:50 AM
Date: Sep 8, 2009 3:45 PM
Hi,
In response to your e-mail, Vance and Hines is not accepting any
orders of any size for the GS500 ignition advancer. We have tried to
talk them into doing another run of them, but they always tell us they
are discontinued and out of production. If you have any other questions
please give us a call toll free at 877-484-4860.
Thank you,
Parts411
if your bike is a pre-2001, you can do this simple ignition advance, straight from the wiki doesn't help everyone, but it may help you.
http://www.gstwin.com/diy_timing_advance.htm
I did the ignition advance on my 07 with the help of bob brousard. I tried the rotor he modified for me and didnt work. Hoever the plate modification seemed to work. I also remember someone a while back that dyno'ed theirs with the plate mod and seen a definate increase after multiple pulls and tuning and higher octane fuels they got all the way up to something like 10 or 15 degrees advance and was still showing increases in power.
You can easily and very cheaply advance the timing on the F models. just enlongate the holes in the rotor pickup mounting plate by 4mm counter clockwise. this advances the timing by 5.5*, this is all the bike likes on regular gas. I dynotuned my timing and the first 2* made no real difference in terms of power but the last 3* made just over 2whp better. More than 6* gives some knock at high revs with no more power no matter the gas.
For other mods do an exhaust (jardine is the best, vance & Hines is close second) lunchbox filter and rejet. then 15 or 14 tooth front sprocket and sport demon tires. then to go more extreme do clipons 20w forkoil and fork springs along with braided steel front brake line. you wont believe its a GS500 when your done!
Excuse me I stand corrected It was only six degrees. But I believe there is another write up out there I will look for.
Taken from http://gstwins.com/gsboard/index.php?topic=45924.20
black and silver twin
Local Club Racer
Offline
Posts: 23
Re: GS500 DYNO SHEETS!!!
« Reply #31 on: July 02, 2009, 09:38:02 AM »
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Quote from: black and silver twin on June 23, 2009, 10:32:09 PM
I just installed my V&H full exhaust, K&N lunch box, 20-62.5-147.5 jets, and +2* custom ignition advance. it definitely feels way more responsive and slightly more powerful (less than I expected but faster none-the-less). but the truth will be told this saturday when I hit up the dyno again! I kinda think its running a tad rich, which is fine, the dyno will tell me the AFR. just to rehash; my stock dyno was 39whp with a 13:1 AFR. I initialy advanced the ignition 6* and the bike lost a TON of power, so I took it back to +1* and it was better than stock so i then put it at +2* and left it because i couldnt tell any difference between 1 and 2 *. BUT I was getting a slight amount of spark knock but that is cured using 89 octane (midgrade). I am going to toggle the timing a bit at the dyno to get the most power and will report back with the results. by the way I am using the same dyno at the same shop operated by the same guy to eliminate as much variation as possible. I can't wait!!!
P.S. a couple days before the install i put on a 15t front sprocket and I will say it made at least as much of an acceleration difference as all the above mods COMBINED
P.P.S. I forgot to mention the V&H is Crazy loud (think NHRA dragster) using more than 1/2 throttle, below that its relatively civilized. I freekin LOVE the sound!
o.k. so im back from the dyno and am reporting back just as promised I went in to the dyno with the above stuff expecting to be really close on AFR and just dial in the timing. but things went the other way. the first pull was 41whp with a 15:1 afr! It was so lean i imediately went and bought more jets before i did any more pulls. I went up to a 152.5 main and put 1 washer under the needles for a total of 1 washer per carb. the next run was better around13:1 afr so i put in the biggest jets i had, 155s. this brought it down to 12.5 - 13:1, not perfect but close for an N/A tune. with 20 pilots, 62.5 mids, 155 mains, 1 washer, and 4 turns out of the idle mix screw she made a whopping 42 whp and 25lb-ft next i played with the timing which took 5 runs. the GS loves timing as i ended up with +6* and was still gaining power! i just ran out of adjustment! with all this done i made 44whp and 27lb/ft. all of the above tuning was done with mid-grade gas because I didnt want to hurt anything advancing the timing. all-in-all it took 10 runs on the dyno; 3 rejets, 5 timing adjustments, 1 base line, and 1 finishing run but my little GS was never fazed. there were only two surprises: 1 there is a very rich spot at 4400 rpm where it goes down to 11:1 afr then back up immediately after, this happened on every run except for when i dynoed it stock a few months ago 2 the power peak stock was 9300 rpm, with all this done its now peaking at 10000! and i have over 40whp from 9000 to 10500. the peak numbers dont do my GS justice because the powerband is so flat across the rpm range she feels like a missile (for a 500..er..487) I think my next steps are to put another washer on each needle or larger main jets then build more adjustment into the timing and keep tuning until i max something else out.
P.S. I will put a copy of the dyno sheets up as soon as I figure out how to work this darned copy/fax/printer thing at work!
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07 black GS500F; fenderectomy, moded petcock, PAIR removed, NGK iridium plugs, 15T sprocket, V&H exhaust, K&N lunchbox, 20-62.5-155 jets 1 washer, timing advance 6*, flushmount signals,Tommaselli clipons over tree, sv650 throttle, 20w forkoil, sport demon tires, Buddha fork brace, Galfer brake line