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Let off throttle, wait second, back on = Faster....

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tomhunter
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Joined: 17 Nov 2006
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PostPosted: 15:29 - 22 Feb 2007    Post subject: Let off throttle, wait second, back on = Faster.... Reply with quote
Let off throttle, wait second, back on = Faster....

Does anyone else get this or is it just my bike. When its chugging along relatively slowly I let off throttle for a second (not changing gears) and then back on and it shoots off..

Question
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Gone2mars
Two Stroke Sniffer



Joined: 12 Dec 2006
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PostPosted: 16:08 - 22 Feb 2007    Post subject: Reply with quote
Not on my bike lol

Shocked Confused Neutral

what ya riding?
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MarkJ
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Joined: 11 Apr 2006
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PostPosted: 16:09 - 22 Feb 2007    Post subject: Reply with quote
Are you sure it's just not because if you let the throttle drop you'll get more of an increase in pull when you twist it back on, as opposed to keeping the revs higher (throttle already twisted a bit) and the difference between that throttle position and fully isn't as much?

I doubt it's faster, just feels like it's pulling more.
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Phil_C
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Joined: 07 Feb 2007
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PostPosted: 16:13 - 22 Feb 2007    Post subject: Reply with quote
Sounds like you might be running rich. As you ease off the throttle you get more air coming in, then you're applying more fuel to that air.
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tomhunter
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PostPosted: 16:35 - 22 Feb 2007    Post subject: Reply with quote
Yeh phil that could be it there are oil deposits in the exhaust
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Phil_C
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PostPosted: 16:36 - 22 Feb 2007    Post subject: Reply with quote
O.o I was right about something mechanical? I think the world is about to end!

Hope you can fix it. Erm.. at a guess.. dirty air filter?
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MarJay
But it's British!



Joined: 15 Sep 2003
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PostPosted: 16:55 - 22 Feb 2007    Post subject: Reply with quote
Phil_C wrote:
Sounds like you might be running rich. As you ease off the throttle you get more air coming in, then you're applying more fuel to that air.


That doesn't make sense to me.

What kind of bike is it? It might have that type of carb with a rubber diaphragm which acts like a set of bellows if you pump the throttle. But I've never seen one on a bike... I assume they did used to put them on bikes...
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tomhunter
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PostPosted: 17:02 - 22 Feb 2007    Post subject: Reply with quote
Its a rieju smx 50cc 2 stroke Cool ... cool as fuck Cool
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Pete.
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Joined: 22 Aug 2006
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PostPosted: 17:03 - 22 Feb 2007    Post subject: Reply with quote
Accellerator pump. CG125 has it Very Happy
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132.9mph off and walked away. Gear is good, gear is good, gear is very very good Very Happy
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MarJay
But it's British!



Joined: 15 Sep 2003
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PostPosted: 17:24 - 22 Feb 2007    Post subject: Reply with quote
Geri wrote:
Accellerator pump. CG125 has it Very Happy


Yeah, thats the shiznit.

Maybe thats exactly what it is.

I doubt its running rich if its a two stroke because the richer they run, the faster they go (until they get coked up!).

All the extra fuel helps piston cooling.
____________________
British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F; Cheap project: CBR900RR FireBlade
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.
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stooster
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Joined: 13 Mar 2006
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PostPosted: 23:03 - 22 Feb 2007    Post subject: Reply with quote
well maybe ive been proven wrong twice....

im also into lammies and vespas...and as far as i know when throttle is opened more air comes in and this draws in the fuel. when throttle is closed the pilot jet does the work...

and also thought a scoot runs better when lean but will eventually sieze the piston .....
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firefox
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Joined: 20 Oct 2005
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PostPosted: 00:15 - 23 Feb 2007    Post subject: Reply with quote
dosent go past 30 though does it Very Happy when i was doing 40 you vanished Shocked
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*officer* what caused the crash ? *firefox* you see that wall up there sir ?
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st3v3
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PostPosted: 00:19 - 23 Feb 2007    Post subject: Reply with quote
Mine seems to do it, what bike you got?
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tomhunter
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PostPosted: 02:12 - 23 Feb 2007    Post subject: Reply with quote
firefox wrote:
dosent go past 30 though does it Very Happy when i was doing 40 you vanished Shocked


All hail roger, for he has a 125

Rolling Eyes
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cestrian
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Joined: 24 Jul 2006
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PostPosted: 02:51 - 23 Feb 2007    Post subject: Reply with quote
MarkJ wrote:
Are you sure it's just not because if you let the throttle drop you'll get more of an increase in pull when you twist it back on, as opposed to keeping the revs higher (throttle already twisted a bit) and the difference between that throttle position and fully isn't as much?

I doubt it's faster, just feels like it's pulling more.


Thats right! It's all in the mind.

As for the accelerator pump, I think that is there to give an extra squirt of fuel when the throttle opens up and the mixture turns very lean. More to prevent stalling as opposed to a power boost.

Regards
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