why do ya'll send the rotor to Bob...when you could just drill two holes in the ig plate and file slots in it.... to do the same thing by rotating the plate

i was reminded of this from the racers corner article....Yes John,  i went to another part of the site.

also i was reading old hard copy stuff from when there were only 26 members on the GStwin mailing list...(1997)and one post by Michael Moore....said to NEVER use an ig advancer...but i couldn't find a follow up
in my papers.

my bike doesn't run so good at high speed with ignition set a 17 degees.....and to me it doesn't make sense to advance the timing for more power...i think retarding it a little might help....but i'm probobly wrong

OK Werase ... Micheal moore was at that time saying that an ignition advancer is to be treated with extreme caution because that might be the last mod you might ever do ... meaning the motor might blow up .... But that was also before we swapped out the 37.5's for 40 pilots, making a extra extra lean bike into a normal one. Filing the slots on the trigger plate ... yea may be an option, but can you imagine the chaos it will cause if we had a 1000 people running around with files ...  :lol:  :lol:  :lol:  And BobB's method is cooler ... and cleaner ...
GRU ... you're running bad with 17 degree ... what is it doing ... you already ahve 40 pilots in it and you have a GSXR can or somehting right ... so what is the problem ... 125 mains and 1 #4 under needle if you got UNI or paper in air box, 127.5 with K&N in airbox, and 150 with K&N pod ... and 3 screws out on mix screws ...
Cool.
Srinath.

ya, gsxr can k&n pod 150 40 2 washers 3 turns out at 17 degrees it runs like the float hight it off...but then i put it back to 12 and it runs great....btw, it only happens at 60 mph or more....and the float hight is right on the spot

my question is why would the motor have more power if you advance the timing and have the spark after the piston is at TDC...stock timing it fires a little after TDC but with advanced timing it fires way after

The initial timing is always BEFORE TDC. Suzuki has 2 timing settings (5/12).
The 5 degree setting is to help emissions. Since the sparkplug fires closer to TDC, the fuel/air mixture is not completely burned. Thus less hydrocarbons emitted (something like that) :dunno:
This means slower throttle response and less power. The 12 degree helps response and increases power a bit. 17 degrees is the maximum advance to get more lowends response.
If you have a 12degree rotor you can slot the ignition plate holes and advance the timing yourself. The main thing is figuring out how far to move the plate for 5 degrees more advance.
The 5 degree rotors have more dwell (wider tab) which needs to be cut down and advancing the ignition plate wouldn't get you to 17 degrees.
Now all this advancing is (as far as I know) only good from idle to around 3000 rpm. After that the black igniter box takes over advancing to a total of 40 degrees (on all models). I'never checked it with a timing light and degree wheel on the crank.
So I don't see how it would affect how the bike runs at higher speeds.
I never noticed any problems on any GS I've ridden (street or track).
I put a 12 degree rotor on my racebike once and it was noticeably more sluggish accelerating out of corners. So I'm sticking with the 17 degree advance.

Quote from: Bob BroussardThe initial timing is always BEFORE TDC. Suzuki has 2 timing settings (5/12).
Now all this advancing is (as far as I know) only good from idle to around 3000 rpm. After that the black igniter box takes over advancing to a total of 40 degrees (on all models). I'never checked it with a timing light and degree wheel on the crank.

The black box takes over.... but it uses the pulses of the ignition rotor to calculate at what moment  it should fire, right? So when you advance the rotor, you would also advance the timing for rpm's >3000, right?  :dunno:

In that case the timing would be 45 degrees Before TDC. Maybe the reason why it doesn't want to run good. But other people didn't have this problem.... Maybe fuel mixture gets more critical and the bike is still set too lean.?  :dunno:

bob;

I have the 17 degree rotor (bought from srinath actually) is it required to use premium fuel?

Se7enty7 ... I run regular ... the thing is so rich ... any richer like you go 1 up on any jet and you'll feel it ... the mix burns slower than a lean mix ... so I haven't felt anyhting. BTW I run regular and not had any issues.
GRU ... advancer is not going to do much after ~3500-4K rpm. The maximum advance is 32 degrees and controlled by black box ... the advancer as modded by bob ... fire the spark earlier and advance it steeper to its plateau. As in fires at 17 degrees, and the advance curve is dwell based ... that tip of the advancer being narrower makes it think the motor is running higher rpm ... so it advances to its 32 degree plateau at ~3500 instead of 4500. Once past 4500 the advancer has no effect. And its degrees before TDC ... not after.
Cool.
Srinath.