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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › Question about a OS-91hz Carb spacer
02-06-2010 04:20 AM  8 years agoPost 1
Chris Herzog

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Covington, La. USA

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Guys,

Just wondering where can I get one these.

The opening in a HZ case for the carb is huge. There is a spacer that is on the bottom of the carb, the part that slides in the case, and this makes it so that the carb fits snug. I have not been able to find this on a parts list and I don't want to have to buy a new 139.00 carb just to get one....Any ideas?

Thanks,
C Herzog

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02-06-2010 05:12 AM  8 years agoPost 2
TMoore

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Cookeville, TN

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The so called spacer you refer to is actually an insulator that is part of the carb body itself. When the carb bodies are produced this insulator is glued onto the body and then machined to fit the bore in the case.

If it were mine I would just machine a sleeve to build up the carb OD or get another carb body as a part and change out the internals. These carbs are very simple to work on so that shouldn't be much of an issue to just change out the carb body.

TM

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02-06-2010 06:29 AM  8 years agoPost 3
Chris Herzog

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Covington, La. USA

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Well that explains why you can't buy it as a part! I would have never thought that it was a machined piece. It didn't look much more than a piece of plastic tubing that was slid over the carb to act as a spacer.

That's a great idea with just buying the carb body, I'll have to look into that.

I'll tell you what I'm doing and at the end of the day I know what you’re going to say, I've already told myself the same thing but it's one of those things that just kept snowballing to where I am now.

I have a HZ and I have a SZ. I originally bought a HZ head with the intention of putting it on the SZ for better cooling. After I got the head I realized that the two cases were a little different and because I'm a little anal I decided to just sell the head and leave the SZ alone. Well, no one wanted the head but meanwhile I came across a HZ crank. After reading how this will smooth out the SZ and because of the great price I could get it at, I bought it. Before I even got the crank, I found a good used HZ case. So I cross referenced the two engines and the only different left that I don't have are the P/S, pin and carb. Eventually I'll buy the P/S and pin but not until I need to. All the ports line up fine with the sleeve so if I can get this 60mm carb to work I'll be happy for now. Swapping the carb body might be the easiest and most inexpensive solution.

I know, I know...I should have just sold the SZ and bought another new HZ...I'm an idiot for doing all this. Live and learn as I’m pulling my hair out of my head.

C Herzog

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02-06-2010 06:32 AM  8 years agoPost 4
TMoore

rrMaster

Cookeville, TN

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Sit tight and wait for a used HZ carb to come available. I got one a few months ago, turned the insulator off and mounted it on an OS 50 Hyper.

TM

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02-06-2010 09:50 AM  8 years agoPost 5
Axeman

rrApprentice

Auckland, New Zealand

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Hi,

According to the OS parts list for the 91HZ carb (both pumped & non-pumped) http://www.gpdealera.com/cgi-bin/wg....pgm?I=OSMG2504

The part number you need is: OSMG6251 27984900 O.S. Insulator 60K

and here it is at Tower:
http://www3.towerhobbies.com/cgi-bi...SEARCH=27984900

Did I just save you $125

Cheers from New Zealand.

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02-06-2010 01:41 PM  8 years agoPost 6
CoronaL

rrKey Veteran

Winnebago IL

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sweet
I was wondering bout this myself. I have some HZ carbs I wanted to futz with in other applications, but was afraid after I cut the insulator off, I was not going to be able to re-use them in an HZ :/

thx again

Randy!!! I am the liquor

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02-06-2010 02:13 PM  8 years agoPost 7
Chris Herzog

rrApprentice

Covington, La. USA

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Axeman,

That's what I was looking for! If you’re ever in New Orleans, look me up and I'll treat you to some kickazz seafood!!!

Thanks guys,
C Herzog

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02-06-2010 02:42 PM  8 years agoPost 8
Dr.Ben

rrMaster

Richmond, VA, USA

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Roughen up the spacer's ID and the OD of the carb's neck a little bit and bond it with slow cure (at least 30 minute) epoxy.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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02-06-2010 03:49 PM  8 years agoPost 9
Chris Herzog

rrApprentice

Covington, La. USA

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Will do thanks,
C Herzog

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02-06-2010 04:30 PM  8 years agoPost 10
Mujenpwr

rrApprentice

Mickleton, NJ

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I did what Ben suggests works perfect

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