The International Cessna^® 170 Association

35 years in service is long enough
Idle shut of is no longer shutting off the idle. I should call it the stumble at 100RPM valve.

A 'new' cab from Spruce is about $800 plus core.
A rebuild kit is around $500 plus labor and more down time.

What are the opinions on rebuilding vs replacing.
While i have the thing apart, is there anything else I should go ahead and do?

I would be buying a NEW carburettor and maybe a remanufactured one at least. the reason being is that a number of AD,s have been incorporated now have to be done . By all means send the core in as a exchange but the carby is the most important part of the aircraft that you do not want to malfunction. The arguments over 1 piece and 2 piece venturies goes on but in the end one has to ask why was the AD introduced. I have heard about the floats which is the best the brass tank or the foam type. So it goes on. But make sure you have the right part number of the carby for your engine type. Most times the cost of bring a carby up to the latest AD status is the same as purchasing anew carby.

I'm a big DIY guy, but for carburetors I like the overhaul exchange option. I'd guess half the parts in your carburetor are obsolete or superseded. As ghost said, there have been a lot of ADs and SBs, you'd have to buy some special tools, and maybe do some machining. Just send it in. On the other hand, if you could find a carb shop that would let you watch one or two overhauls you might be comfortable doing it yourself.

You might Terri Bell a call. She does carburetor overhauls in Hagerstown.

Or you can get one of these beauties. http://avstardirect.com/carburetors

I'm afraid to see what that thing would cost. If I was keeping the plane longer...maybe.

I'm swapping carbs because I'm putting 81D on the market soon and I don't want to haggle price on an idle cutoff issue.

Seems like buying an overhauled one is the fastest way to resolve the issue.

bagarre wrote:I'm afraid to see what that thing would cost. If I was keeping the plane longer...maybe.

I'm swapping carbs because I'm putting 81D on the market soon and I don't want to haggle price on an idle cutoff issue.

Seems like buying an overhauled one is the fastest way to resolve the issue.

Agreed. I would go for the rebuild as well even if keeping it. They cost about $1600 and are now standard on new Lycomings.

Unless you have a flow-bench... I'd exchange it....and have the advantage of a warranty and the most recent SBs.

Yeah. I'm just gonna buy a new carb - unless someone buys the plane before that

I've rebuilt plenty of carbs on Harleys over the years. Carbs in general don't scare me.
Carbs attached to something with wings is a whole different story tho.

When I overhauled my O-300A in 2006, I got an exchange carburetor from Chief Aircraft. It worked like a charm until July 19, 2014 when it died trying to stop a Cherokee propeller...