Stumble at about 2400 RPM and soft rear brake pedal

[KhromalusionaL]

Guys,

Its been a while since I have posted.

Like my topic title states I am getting a pretty noticeable stumble at 2400RPM while slowly accelerating. I notice it mainly while city riding. I did notice it pretty bad when I had a pillion the other day. I do not notice it if i am hard on the throttle though. Any ideas.

Second issue is a really soft rear brake pedal. I replaced pads last summer at about 26K. Probably didn't have to after the thought but i did. I noticed ever since my rear brake pedal seems soft. I can almost push it all the way down to the stop before the bike comes to a stop. I have bleed the brakes like the factory service book state to. After I do that it seems to be a lot stiffer but after a bit it seems to go back to soft. I have plenty of fluid and I have bleed the brakes 3 times since last summer. Any ideas.

Bike is an 08 with 35K on it. Aftermarket add ons include: KN Filter, VH CS one Pipes, PCV w/Auto Tune, GS Throttle tube.

 

[Donal]

When you bleed the brakes are bleeding at the front & rear. With linked brakes you need to do both.

 

[KhromalusionaL]

If I remember correctly the factory books says start on the left side of the bike then right then rear. I bleed them all when I do it. Also i believe that the right caliper has a separate bleeder for the linked side of the system.

 

[Intech]

Both front calipers have separate bleeds for the linked brakes. If the brake is spongy you probably still have air in it somewhere.

 

[AVGeek]

Agreed, I also have an 08, and it had the spongy rear pedal. I did the rear caliper, then the front, and it's back to a nice firm feel now with no relapse to sponginess.

 

[BobQ]

As far as the stumble, make sure your auto tune has no F/A ratios in the 2% column, and the 5% column up to about 5000 rpm. Also check your map, I am thinking †he auto tune has set some of the above areas into the negative nums, if they are, set them back to the stock table, some where from 5 to 10. Let me know how you make out.

Bob