CB919 fueling - Wrist Twisters
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post #1 of 4 Old 08-05-2019, 11:17 PM Thread Starter
Tirone
 
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CB919 fueling

Hi all.

Wonder if there is an easy fix for jerky throttle a low revs on my 919 2003. All standard apart from Bewolf end cans and flapper mod.

I hear a Power Commander remap will help but is an expensive option. 450 😞 Has anyone any thought of booster plug? Supposed to help with this by increasing the fueling ratio by a tiny amount. Not looking for more power by the way.

Do the standard map make the fueling lean or rich?

Confused

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post #2 of 4 Old 08-07-2019, 09:26 AM
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Power commander does help. So does a 17t front sprocket, removing slack from your throttle cables and also practicing smooth throttle control.
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2007 919
2003 CBR1100XX
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post #3 of 4 Old 08-08-2019, 03:03 PM
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Quote:
Originally Posted by aspect1968 View Post
Hi all.

Wonder if there is an easy fix for jerky throttle a low revs on my 919 2003. All standard apart from Bewolf end cans and flapper mod.

I hear a Power Commander remap will help but is an expensive option. 450 😞 Has anyone any thought of booster plug? Supposed to help with this by increasing the fueling ratio by a tiny amount. Not looking for more power by the way.

Do the standard map make the fueling lean or rich?

Confused
919s are not factory mapped overall lean or rich.
Not at all.
As evidenced by good tuning via a Power Commander, they are rich here, lean there, as a function of Throttle Opening X RPM on a x by Y grid map.
A simple single fixed change device is of no real solution.

Keep in mind, that for whatever reason(s?), 919 riders experience varying degrees of the effects of bad stock mapping.
Some don't experience it.
Some experience some.
Some experience lots.
The ones that experience it, likely also feel an aggravated form of it due to the crazy soft front springs.
Personally, I experienced lots, but only at low RPMs and small throttle openings, especially on hot days with a hot engine.

And like Ditch said, too much throttle slack in particular, can really aggravate the mapping.
Throttle control is also a factor, but sometimes OK rider throttle control is masked by excessive throttle cable slack and bad mapping at low RPMs and small throttle openings.
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post #4 of 4 Old 08-09-2019, 12:05 AM Thread Starter
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Thanks for the good advise. I check for cable slack asap 👍

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