2/21/2023 0 Comments Gs500 ignition advancethis brought it down to 12.5 - 13:1, not perfect but close for an N/A tune. the next run was better around13:1 afr so i put in the biggest jets i had, 155s. I went up to a 152.5 main and put 1 washer under the needles for a total of 1 washer per carb. 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. 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. I forgot to mention the V&H is Crazy loud (think NHRA dragster) using more than 1/2 throttle, below that its relatively civilized. 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 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 am going to toggle the timing a bit at the dyno to get the most power and will report back with the results. BUT I was getting a slight amount of spark knock but that is cured using 89 octane (midgrade). 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 *. just to rehash my stock dyno was 39whp with a 13:1 AFR. 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. it definitely feels way more responsive and slightly more powerful (less than I expected but faster none-the-less). I just installed my V&H full exhaust, K&N lunch box, 20-62.5-147.5 jets, and +2* custom ignition advance. Quote from: black and silver twin on June 23, 2009, 10:32:09 PM But I believe there is another write up out there I will look for. Excuse me I stand corrected It was only six degrees.
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