MetalMatty
Member
So, this Speedmaster is not mine. My partner bought it, never rides it, so I do.
I actually thought this thing was carbureted... The throttle bodies shoved into fake carburetor trick is GENIUS.
Unfortunately, this puts me out of my comfort zone. I've only ever had carb bikes, so this being EFI is new to me.
When he bought the bike, it already had aftermarket exhaust on it. I'm not sure what brand of anything cause the bike is in the garage and I'm not, but they don't SEEM to be straight pipes.
In any event, the thing is clearly struggling a LITTLE bit with fueling now. Throttle spiking off idle sometimes results in a throttle dip or a big hesitation before RPM increase, cruising at a constant low throttle causes quite a bit of hesitation/sporadic throttling, and there is pretty significant decel popping. Also, every now and again while rev matching a downshift, the throttle spike will literally do NOTHING. It won't drop, or spike, just kinda nothing.
Now, on a carb bike I'd just yank the carbs off, increase main jet a little, and probably go another half turn/full turn on AFR screw.
So, I guess after all my rambling, my question is: Is there ANY way to try and smooth it out other than dropping $200+ on an ECU tune? I read a bit about the "12 minute tune up", but that seems to be more focused on older EFI Triumphs, and also ECU adaptation usually isn't enough to overcome something as severe as exhaust or intake.
Sorry for the big rant for a first post! Looking forward to browsing this forum and learning some stuff for this very new to me set up.
On a side note, this might be one of the best all around bikes I've ever ridden. I ALMOST prefer it to my old '97 VFR750, and that's really saying something.
I actually thought this thing was carbureted... The throttle bodies shoved into fake carburetor trick is GENIUS.
Unfortunately, this puts me out of my comfort zone. I've only ever had carb bikes, so this being EFI is new to me.
When he bought the bike, it already had aftermarket exhaust on it. I'm not sure what brand of anything cause the bike is in the garage and I'm not, but they don't SEEM to be straight pipes.
In any event, the thing is clearly struggling a LITTLE bit with fueling now. Throttle spiking off idle sometimes results in a throttle dip or a big hesitation before RPM increase, cruising at a constant low throttle causes quite a bit of hesitation/sporadic throttling, and there is pretty significant decel popping. Also, every now and again while rev matching a downshift, the throttle spike will literally do NOTHING. It won't drop, or spike, just kinda nothing.
Now, on a carb bike I'd just yank the carbs off, increase main jet a little, and probably go another half turn/full turn on AFR screw.
So, I guess after all my rambling, my question is: Is there ANY way to try and smooth it out other than dropping $200+ on an ECU tune? I read a bit about the "12 minute tune up", but that seems to be more focused on older EFI Triumphs, and also ECU adaptation usually isn't enough to overcome something as severe as exhaust or intake.
Sorry for the big rant for a first post! Looking forward to browsing this forum and learning some stuff for this very new to me set up.
On a side note, this might be one of the best all around bikes I've ever ridden. I ALMOST prefer it to my old '97 VFR750, and that's really saying something.
