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 Snatchy off-idle Throttle Response fixed!

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Liberty1




PostSubject: Snatchy off-idle Throttle Response fixed!   Wed Feb 10, 2016 3:38 am

I tried increasing the TPS setting to about 102 with a little success.
I tried adjusting the CO to 10 with little effect, it was nearly there originally.
I tried drilling out the idle circuit to raise idle speed to 2250 or so with a little success.
I tried a programmer with no success. Threw it in garbage, that helped a bit!

The higher TPS setting made the throttle a little more responsive or with less hesitation when going from idle off throttle, to light throttle application.
The increased idle speed helped cover up the snatchy throttle response or the transition from no power at idle to power when the throttle cracked smoothness.

The solution though is so obvious I am amazed I did not figure it out sooner! This required 1 more adjustment that all the other adjustments were attempting to solve though not directly, or effectively.

Now I enjoy and love my WR250R with a smooth idle transfer at light throttle applications for Trials Riding.

Anyone want to guess the solution before I tell you?  Any interest?
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YZEtc

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PostSubject: Re: Snatchy off-idle Throttle Response fixed!   Wed Feb 10, 2016 6:59 am

Throttle cable slack or free play.
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dmmcd

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PostSubject: Re: Snatchy off-idle Throttle Response fixed!   Wed Feb 10, 2016 10:15 am

Husqvarna WR250?  hide

A different throttle tube might do the trick also, with a different cam profile.
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Guest
Guest



PostSubject: Re: Snatchy off-idle Throttle Response fixed!   Wed Feb 10, 2016 11:02 am

Bumped the throttle blades open slightly.
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dhally

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PostSubject: Re: Snatchy off-idle Throttle Response fixed!   Wed Feb 10, 2016 1:34 pm

Geared it down?
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sophijo




PostSubject: Re: Snatchy off-idle Throttle Response fixed!   Wed Feb 10, 2016 2:05 pm

OK...that should do it! What's the answer!
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Fiftygrit

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PostSubject: Re: Snatchy off-idle Throttle Response fixed!   Wed Feb 10, 2016 3:10 pm

I think he left laughing. poser2
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mcdoudlehopper

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PostSubject: Re: Snatchy off-idle Throttle Response fixed!   Wed Feb 10, 2016 10:03 pm

Welcome! Nice first post. I give up dunno
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Guest
Guest



PostSubject: Re: Snatchy off-idle Throttle Response fixed!   Wed Feb 10, 2016 10:05 pm

Traded it in on a Beta? Rolling Eyes
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Liberty1




PostSubject: Re: Snatchy off-idle Throttle Response fixed!   Wed Feb 10, 2016 11:24 pm

Thx for the reply's:

The Solution to the off idle throttle hesitation, is to turn inwards the FI throttle body stop screw, just like you do on a Carburetor when you adjust the idle speed and the throttle blade location.

I turned in my set screw a little more than 1 full turn. This raised the idle speed to 3000 RPM or so. Then I turned in the other plastic idle speed screw on Left side of throttle body all the way in to lower the RPM resulting in a 2500 RPM idle speed. Perfect!

To do this, Remove fuel tank and hang on handle bars for support, and you can see the stop screw and lock nut on the left side from the top under tank.  The nut is 8mm and the allen wrench is 2.5mm long arm. Loosen and adjust with the engine running and can adjust to RPM using the factory Tachometer.

See pics














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mcdoudlehopper

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PostSubject: Re: Snatchy off-idle Throttle Response fixed!   Wed Feb 10, 2016 11:32 pm

Liberty1 - Wanted to warn you about another thread on this forum that others have said about problems moving the TPS past 99% that it can stick open and hang up. will post it up if I find it, just wanted to let you know. Don't think it would be a fun ride at WOT. get the f out
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Guest
Guest



PostSubject: Re: Snatchy off-idle Throttle Response fixed!   Wed Feb 10, 2016 11:41 pm

So you bumped the throttle blades open slightly? :)
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Liberty1




PostSubject: Re: Snatchy off-idle Throttle Response fixed!   Wed Feb 10, 2016 11:47 pm


Traveller...Yes I bumped the throttle blades open slightly!!!
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Liberty1




PostSubject: Re: Snatchy off-idle Throttle Response fixed!   Wed Feb 10, 2016 11:51 pm

mcdoublehopper, remember the throttle body has a dual acting throttle cable. Look at it, it's not like a car. It has both retraction and on opposite side extention....to cables which enable you to pull the throttle shut as well as open. I feel comfortable.

I noted my TPS this morning was 101/24.

Good luck
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Guest
Guest



PostSubject: Re: Snatchy off-idle Throttle Response fixed!   Wed Feb 10, 2016 11:52 pm

I was being tongue in cheek. Note my earlier post... :) Cool you got it to work better.

Since the idle air is adjustable, that's what I was going to do to mine. Crack the blade a tiny bit, then adjust the air screw. The Dobeck took some of the light switch feeling away on mine, so I put it off.

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mcdoudlehopper

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PostSubject: Re: Snatchy off-idle Throttle Response fixed!   Thu Feb 11, 2016 12:01 am

Ah yes good point! would the 101% be the same as 99% so it wouldn't have to actually close to 100% before opening again? Not that familiar with throttle bodies.
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Liberty1




PostSubject: Re: Snatchy off-idle Throttle Response fixed!   Thu Feb 11, 2016 1:02 am

Bike runs great with this throttle stop adjustment. Very smooth! I'm very happy now! The idle is higher though, which I like too.

I think this works because the Fuel Injector never really shuts off to exactly 0 with the throttle blade cracked slightly. It's as if you have a tiny bit of throttle on always, taking up the gap or slack if you will. The main fuel and air flow never goes to zero. So then when you give it a tiny bit of throttle, there is no lag because it is already injecting fuel. Now you have just given it more main circuit fuel and air, with no hesitation.

I really like the higher idle speed too. It stops the herky - jerky on/off throttle when just riding around town. Much nicer and smoother, like it should be. Like the old days with a Carburetor, only better and cleaner for sure now. Plus it is super off road climbing hills and also idling in parking lots. Lot smoother.
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MotoKirby




PostSubject: Re: Snatchy off-idle Throttle Response fixed!   Sun Feb 14, 2016 12:52 pm

While I have no doubt this works, I just use the clutch to smooth the bike. I guess riding dirt bikes for years conditioned me to always use the clutch, no jerkiness.
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CC_Rider




PostSubject: Re: Snatchy off-idle Throttle Response fixed!   Mon Feb 15, 2016 3:52 am

I have found that inputting values to my PCV software in the 0% throttle cells was the nail in the coffin to my snatchy throttle.  I have the idle AFR set to 13.2 (0% throttle, 1500-1750 rpm) and the rest of the 0% cells from 2000-10000rpm set to +5.  This keeps the injectors open at all time except between 1500 and 1750, rpm ranges you would never be in during driving conditions and throttle operation.  These bikes seems sensitive to minor changes, so going from a good mix at mid throttle to zero fuel at zero throttle is very noticeable.  Damn emission regulations, choking out our little bikes...

Does this mod permanently raise the idle? Did you try lowering it with the idle adjustment on the left side of the FI throttle body?  I personally wouldn't ever run an idle above factory settings, but that's just because I see alot of red lights and traffic.  If the idle can sit at 1650 and you have cured the snatchy throttle with a simple tweak to the screw, which I believe does the same thing as adding fuel at 0% throttle, then this mod should be a sticky
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Stubbz

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PostSubject: Re: Snatchy off-idle Throttle Response fixed!   Mon Feb 15, 2016 12:17 pm

just replace your stock throttle stop screw with an idle adjust cable like all stunters do for extra idle pull, even not stunting it comes in handy in tighter terrain, stock idle sucks when you let off the bike wants to dive hard and can easily cause you to lose balance when offroading. first mod ive done to all 3 of my wrx's is add an idle cable, may be why ive never understood what people are referring to with snatchy throttle. The on n off is caused by whats mentioned above, to low of idle and 0% fuel when let off. idle cable or idle stop screw adjustment hangs it open a little, problem resolved. Cable works far better for reasons above also, stop and go traffic you can run it lower anytime you want but when you want a little extra idle for offroad smoothness its a quick one turn away.
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