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View Full Version : 4000-5000rpm boggs down-holds back



frit
08-03-2009, 12:25 PM
My 2008 xb12s most of the time will bog down-hold back from 4000rpm all the way to 5000rpm where with a big jolt the power comes back.This typically happens when i am doing 50-60mph in 3rd-4th gear.However if i am thrashing it as i go through 4000rpm to 5000rpm there is a few small jolts or its more like a ruff patch.
The bike shop looked at the problem and hooked it up to the computer and tweaked the 02 sensor or something.The bike worked only a little better for about 30mls but then the problem fully returned.
The bike is booked in for another look but i thought it could be worth checking to see if any one out there may of had the same problem or has advise ect.

Sidewinder
08-03-2009, 06:53 PM
Could be the interactive exhaust valve. It opens up at the mid range usually around 3500+ RPMs. If it stays closed it would create that dead spot you speak of.

gbalias
08-03-2009, 08:11 PM
is the bike totally stock?

buellet proof
08-04-2009, 03:37 AM
My bike does it too, I think mine is between 3000-4000. Mine started right after I put my new pipe on.

frit
08-04-2009, 11:30 AM
The bike is standard except for a kn filter,but i did this to see if it would cure the problem.I think it helped just a tiny bit.Maybe i should of stuck the original back in before they tweaked it the other day.Actually i will stick the original filter back in just to be sure it does not mess up there next attempt at fixing the problem.