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HomeAircraftHelicopterHelicopter Main Discussion › Old school heli flyers,info needed
08-13-2018 01:59 PM  43 days agoPost 1
gearset

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Thunder Bay Ontario

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Hey. I have a ys61 st.. the engine has been cleaned,new diaphram as well. The engine runs well but leans out at about half tank of fuel. How can I fix this.
Thanks.

Livin'............

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08-13-2018 02:15 PM  43 days agoPost 2
shlm

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West Chester, PA

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Have you checked the check valve?




Steven B.

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08-13-2018 03:28 PM  43 days agoPost 3
R.J.

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SF bay area, CA USA

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If the check valve is okay, check/ change your fuel lines, especially the fuel pickup line inside the fuel tank. A hole/ crack in the line will cause it to go lean mid tank.

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08-13-2018 06:34 PM  43 days agoPost 4
MattJen

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UK

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as others have mentioned, plumbing etc, with the check valve make sure it is in the correct way round.

All The Best

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08-13-2018 07:21 PM  43 days agoPost 5
JuanRodriguez

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The Villages, Florida

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If the check valve was installed the wrong way, that motor would not “run well” for 1/2 tank......

Won’t hurt anything checking, though......

Been there, done that and old enough to know better.....

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08-13-2018 08:09 PM  43 days agoPost 6
Jeff polisena

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westpalmbeachflorida usa

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Sometimes if tubing is lower than carb it can cause inconsistent flow or a lock not letting fuel flow freely . Try anything different to get better results even if it doesn't make sense .

I stole it ,flew it and gave it back ;)

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08-13-2018 08:12 PM  43 days agoPost 7
gearset

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Thunder Bay Ontario

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It uses crank pressure and a check valve,tank/fuel line location isn't the problem. But good advice

Livin'............

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08-13-2018 08:18 PM  43 days agoPost 8
Jeff polisena

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westpalmbeachflorida usa

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1.25 on low needle ? try opening another .25 and then tune mid and high . Might just want more . Tubing thickness in tank is worth looking at .

I stole it ,flew it and gave it back ;)

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08-13-2018 08:41 PM  43 days agoPost 9
RM3

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Killeen, Texas - USA

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You state after 1/2 tank which basically says to me there is a factor tied directly to fuel level, SO... Exposure of fuel components inside tank to either fuel or air may be a result.

it cant be vapor lock... as the engine heats up pretty quickly and would show this despite what the fuel level is. so tuning is almost ruled out.

so I say try putting in a 1/4 tank and see if it results in the same thing... if it does somethings wrong with the plumbing.

showing a preference will only get you into trouble, 90% of everything is crap...

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08-14-2018 06:18 AM  43 days agoPost 10
TMoore

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Cookeville, TN

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You have a fuel delivery issue. If the engine goes lean at any point in the run that means the the fuel flow was constrained somehow. Do all the checks that everyone else has advised and then add this.

After the engine starts up and idles for a bit do a quick test hover, land and pull the vent line on the tank and see if it's pressurized. If it fails there is a leak.

Delayed Response Operator Not Engaged
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08-14-2018 08:20 AM  43 days agoPost 11
JuanRodriguez

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The Villages, Florida

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One other thought ....

Remove the needles and check for any obstruction which would effect fuel flow..... for example, a small piece of silicone that may have found its way from sealant used to seal the muffler to engine block ......

Been there, done that and old enough to know better.....

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08-14-2018 04:00 PM  42 days agoPost 12
gearset

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Thunder Bay Ontario

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It was brass tubing in the rubber stopper that was cracked

Livin'............

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08-14-2018 04:14 PM  42 days agoPost 13
BeltFedBrowning

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Kansas City

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That was hard to find!

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08-14-2018 04:14 PM  42 days agoPost 14
Jeff polisena

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westpalmbeachflorida usa

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The simple stuff will drive you crazy , glad you fixed .

I stole it ,flew it and gave it back ;)

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08-14-2018 04:27 PM  42 days agoPost 15
RM3

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Killeen, Texas - USA

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Yay I win!

showing a preference will only get you into trouble, 90% of everything is crap...

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08-14-2018 08:58 PM  42 days agoPost 16
Jeff polisena

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westpalmbeachflorida usa

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Most of the time you ^ do

I stole it ,flew it and gave it back ;)

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08-15-2018 02:12 AM  42 days agoPost 17
Flyin for Jesus

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Troy, IL. 62294

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