Q-500 Racing Discuss AMA 428, AMA 424, and any other variants of Quickie 500 racing

Nelson q500 throttle linkage

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Old 10-18-2008, 09:41 PM
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Default Nelson q500 throttle linkage

Would someone mind posting a picture of how they have the "throttle" linkage on their q500. Specifically the throttle arm, I am having trouble getting the linkage setup. With a balljoint on the arm it crams up against the fuel nipple and wont close the barrel completely, if that makes any sense.
\Thanks
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Old 10-19-2008, 12:49 AM
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Default RE: Nelson q500 throttle linkage

I wouldn t worry to much about that. They normally don t run very much longer when the barrel is in that "near" closed position.


BV
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Old 10-19-2008, 10:57 AM
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Default RE: Nelson q500 throttle linkage

Thanks for the reply, here a couple pictures. Will the thing shut down with that much of the barrel open? Sorry for the green horn questions. I would just try to run it but I dont want to have to pull everything apart if I cant get it to shut down.
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Old 10-19-2008, 11:04 AM
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Default RE: Nelson q500 throttle linkage

The smaller white plastic ball links work better. That one is pretty big. I still think it would shut off how you have it though. I like to get it to shut completely in case you know you are going to crash, you can keep the mud out of the motors.
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Old 10-19-2008, 11:46 AM
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Default RE: Nelson q500 throttle linkage

Like Dave said, most of us use the regular white ball links. What you have should be enough to shut it off, but I'd still grind a bit of that ball link off to give a little more throw. Closing it completely isn't just easier to keep dirt out during crashes, it also helps if you roll off the runway into dirt on landing or something.
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Old 10-19-2008, 12:42 PM
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Default RE: Nelson q500 throttle linkage

Try the new needle valve from PS with the fuel fitting on the top
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Old 10-20-2008, 03:36 PM
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Default RE: Nelson q500 throttle linkage

Thanks guys, got one of those white links and it works fine. May switch to the new PS valve as it would route the fuel line better.
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Old 10-20-2008, 03:57 PM
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Default RE: Nelson q500 throttle linkage

I've used the top needle on some planes, works pretty good. My only issue is you need to add a break in your fuel line for fueling. Its very tough to get the fuel line off and off the brass fitting, its a rather tight fit.
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Old 10-21-2008, 07:11 AM
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Default RE: Nelson q500 throttle linkage

AND... we've seen many of those new "top sided" needles break. Stick with the standard needle...

wc
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Old 10-21-2008, 12:24 PM
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Default RE: Nelson q500 throttle linkage

Randy, where have they broken? I've been running them exclusively since they came out, and have had zero issues. However I have seen one pull the fuel line fitting out as it's a press fit. I can see where if you're constantly pulling on it to refuel that it may be pulled loose over time. I don't remove the fuel line at the needle, I use a filter and pull the line at the filter for fueling. Attached is a pic of my Proud Bird installation, but it's similar to what I do on my Q500's.

Periodic defects are going to happen, I actually had one of the standard needle assemblies break at the end of the threads for the nut that holds it in place about 15 years ago.
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