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george.mueller(at)aurora.
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 Posted: Mon Mar 10, 2008 5:57 am Post subject: Hesitation |
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I am having a hesitation when I put the throttle in on my 912UL powered Zenith 701. The RPMs come up smoothly as I put the throttle in, but when I get close to full power, I get a hesitation for about 1 or 2 seconds at around 4800 RPM. Then, after this hesitation, the RPM continues on to 5200, which is what I am currently getting at wide open throttle on takeoff. I am thinking there is something about the geometry of my throttle cables that might be causing this but when I take the cowl off and watch the cables move the throttle it seems pretty smooth all the way to full power. Does anyone have any idea what might be causing this?
George in Milwaukee
CH 701 912UL [quote][b]
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Mon Mar 10, 2008 7:29 am Post subject: Re: Hesitation |
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Hi George,
Just a couple of thoughts.
When was the last time you did a full carb sync? A carb sync will help rule out a cable length issue. Until you do a sync and know everything is working equally on both sides then doing anything else is just a guess.
You may want to check the float control arm. You need to pull the carb off. Pull the bowl off and measure the float arm. It should be 10.5mm from the side edge of the bowl to the top of the main jet shoulder with the arm resting at it's bottom position. Not the top of the main jet itself, but where you screw it in.
One way to check to see if you have a carb issue is to run your engine up to 3500-4000 rpm on the ground. Apply the choke, very little if anything should happen. The enricher doesn't have an affect after this rpm. If you notice a drop (more than 25rpm) or an increase then you have a carb/fuel issue.
I'm leaning towards the sync and float side of this so far. If you have done a sync in the not very distant past (less than 25 hrs) then check the float and needle.
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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
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