Downshifting issue?

tommyl8586 · Jun 13, 2013

Hey everyone! Maybe someone can help me figure this out...not every time, but pretty often, and usually only from 2nd to 1st, when I twist the throttle to match speeds the motor sort of cuts out for a second and there is an almost snapping noise and then the motor comes back. Anyone ever hear of this? Any suggestions.

Negative · Jun 13, 2013

About what rpm are you blipping the throttle at to match the bike speed when going from 2nd to 1st?...

go cytocis · Jun 13, 2013

These long-stroke, single-throw HD mills have heavy flywheels and are pretty slow-revving, especially the XB12 models. They don't respond to quick throttle blips very well. This condition seems even worse at lower revs (like you may be running between 2nd & 1st) and with the stock maps, which cause the hesitation & stuttering symptoms you describe.
I'd start with a TPS reset which will help somewhat with throttle response if it's been a while since you last did this proceedure.

Failing that, I'd look at remapping, either doing it yourself or purchasing a pre-programmed ECM (this virtually eliminated the problem for me).

Also, try down-shifting at higher revs. This can be a bit of a challenge on urban streets with the taller gearing of the 12 because you'll be downshifting to first at atleast 50km/h (30 mph), but it will help eliminate the hiccup.

tommyl8586 · Jun 13, 2013

I am usually going 20 or less when I shift down to 1st. I tried your suggestion on the way into work tonight cytocis, and it seemed to help. I definitely need to do a TPS reset though too. I am going to be ordering a cable soon so I can do that. Thanks for the tips!

Downshifting issue?

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