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HelicopterMain Discussion › Removing the pump from an OS91HZ-PS????
08-27-2012 02:03 PM  5 years agoPost 1
McKrackin

rrProfessor

Lucasville,Ohio

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What's involved?

Just a new back plate?

The carb uses the pump AND muffler pressure.

Would I need a new carb?

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08-27-2012 02:19 PM  5 years agoPost 2
Zbawer

rrApprentice

Singapore

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Yeah this older version is notorious for pump failures.
I bypassed the pump on mine and just use mufler pressure.
Stick a 3mm screw in the tube coming out of the backplate be done with it.

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08-27-2012 02:21 PM  5 years agoPost 3
McKrackin

rrProfessor

Lucasville,Ohio

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I've had three new pumps that leak fuel and suck air right out da box.

So I can keep the regulator and just bypass the pump?

Awesome.
I'll give it a shot.

Thanks.

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08-27-2012 02:39 PM  5 years agoPost 4
Zbawer

rrApprentice

Singapore

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Yes I could run mine keeping the regularor on with no noticable mixture issues...
Go for it!

Only after quite some time without running, the rubber diaphragm inside of it failed on me so I replaced the whole regulator with a standard inlet. End result was exactly the same.

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08-27-2012 02:49 PM  5 years agoPost 5
McKrackin

rrProfessor

Lucasville,Ohio

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What do I need to do away with the regulator as well?
A part number maybe?

I loved my old OS91HZ.

No pump.
No regulator.

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08-27-2012 03:32 PM  5 years agoPost 6
Zbawer

rrApprentice

Singapore

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Here you go :
O.S. Fuel Inlet #61B 91HZ
[url=http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXVHH9&P=SM]

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08-27-2012 03:44 PM  5 years agoPost 7
McKrackin

rrProfessor

Lucasville,Ohio

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Thanks...Ordered.

I'll be back to my basic OS91HZ soon.

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08-27-2012 03:49 PM  5 years agoPost 8
bmapope

rrVeteran

TN

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I've been running a fuel dot in a piece of fuel tubing for almost 4 years now. Didn't change anything else.

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08-27-2012 04:03 PM  5 years agoPost 9
McKrackin

rrProfessor

Lucasville,Ohio

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What's a fuel dot?

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08-27-2012 06:52 PM  5 years agoPost 10
bmapope

rrVeteran

TN

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08-27-2012 07:03 PM  5 years agoPost 11
McKrackin

rrProfessor

Lucasville,Ohio

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lol...That's exactly what I have now

It runs good but the pipe is a leaky mess.
New one enroute.

This is the leakiest engine I've ever seen.

Might pitch it in the trash and get a new one soon.

I literally never use the word literally right.

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08-27-2012 07:17 PM  5 years agoPost 12
bmapope

rrVeteran

TN

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before the trash I can pm my address to ya!

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HelicopterMain Discussion › Removing the pump from an OS91HZ-PS????
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