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PostPosted: Wed Jan 16, 2008 9:33 pm 
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anyone interested in having a look at my xb8 to tell me why it wont keep running ?

i can get it to idle, and rev ok, when i break it dies, looking down the carb and watching this all happen i can see that when the brake is used, it pushes the card past nutral and stalls.

what i dont know is how or why and how to fix it.


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PostPosted: Wed Jan 16, 2008 9:50 pm 
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when i first got mine, had a similar problem, guy at the model shopped fixed it by playing around with the choke? something about not getting enough air in to keep engine running, might be that?


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PostPosted: Wed Jan 16, 2008 10:59 pm 
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Hi Ed,

Increase the idle speed using the idle stop screw.

It sounds like you have the screw set too low and the idle is being set by the neutral position of your servo.
This will allow it to idle and rev however when you hit the breaks the servo no longer holds the idle up and it drops too low allowing it to stall.

Also is the throttle linkage bent at all?

This is taking into account that your fuel mixture settings aren't way out.

Just my 2 cents :lol:


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PostPosted: Thu Jan 17, 2008 7:41 am 
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Crocket wrote:
Hi Ed,

Increase the idle speed using the idle stop screw.

It sounds like you have the screw set too low and the idle is being set by the neutral position of your servo.
This will allow it to idle and rev however when you hit the breaks the servo no longer holds the idle up and it drops too low allowing it to stall.

Also is the throttle linkage bent at all?

This is taking into account that your fuel mixture settings aren't way out.

Just my 2 cents :lol:


Exactly what Dave said

If you cant fix it - give it to me and I'll have a look

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Mark

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PostPosted: Thu Jan 17, 2008 9:41 am 
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ooohhhh


its a mechanical stop. not a mixture adjustment

ive never touched it, ive only ever touched the main fuel to suit the air temperature.

I had replaced the throttle linkage and its return spring and set it up for a straighter path.

i guess if there was binding with the old linkage it may have stopped it going past that nutral point.

thanks for that Dave


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PostPosted: Thu Jan 17, 2008 9:43 am 
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macca wrote:
Crocket wrote:
Hi Ed,

Increase the idle speed using the idle stop screw.

It sounds like you have the screw set too low and the idle is being set by the neutral position of your servo.
This will allow it to idle and rev however when you hit the breaks the servo no longer holds the idle up and it drops too low allowing it to stall.

Also is the throttle linkage bent at all?

This is taking into account that your fuel mixture settings aren't way out.

Just my 2 cents :lol:


Exactly what Dave said

If you cant fix it - give it to me and I'll have a look


I plan to bring it on sunday to the show, so i may take you up on that.

Ed


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