Whistle at idle and backfire

BHB · **Posted:** Sat May 05, 2012 3:55 pm

I have a 180 lycoming with an ha-6 carb. Just had the carb rebuilt and new intake and exhaust gaskets installed. It's making a whistling sound at idle and backfiring when I let off on it. Also it falls on its face when you hit the throttle even just easing into it. I'm thinking probably an intake or exhaust leak? It's backfiring through the exhaust. Any help would be greatly appreciated. Thanks.

pirate · **Posted:** Sat May 05, 2012 4:24 pm

Check this out.

http://home.comcast.net/~r123rs/Documen ... Manual.pdf

swamp runner · **Posted:** Sat May 05, 2012 5:51 pm

how did it run before ? sounds like the carb wasnt done right ,the excelorator pump not working . make sure that the exhaust nut didnt run out of threads before it snuged up against the header , you might need to put a washer .

junebug · **Joined:** Mon Apr 25, 2011 6:40 pm **Posts:** 191

Intake Vacuum leak..Spray some starting fluid around the tubes it will let you know which one is sucking air..

hmgm123 · **Posted:** Sat May 05, 2012 9:34 pm

junebug wrote:

:rebel: Intake Vacuum leak..Spray some starting fluid around the tubes it will let you know which one is sucking air..

BINGO!

woods and water · **Joined:** Mon Jun 07, 2010 6:53 am **Posts:** 228

Intake leak check gaskets and hoses

BHB · **Posted:** Sun May 06, 2012 3:07 pm

Thanks for the quick replys. I tightened up the exhaust and and intake and the whistle stopped but one of the headers studs won't tighten up seems to be rung off inside the jug it just spins. Is there an easy way to fix this problem?

swamp runner · **Posted:** Sun May 06, 2012 7:22 pm

go to ace and get a helicoil kit . that will fix you right up :thumbleft:

blown480 · **Joined:** Mon Nov 16, 2009 9:43 pm **Posts:** 1266

5/16 -18 helicoil kit will fix you up,

BHB · **Posted:** Sun May 06, 2012 8:08 pm

Thanks everyone really appreciate it

BHB · **Posted:** Mon May 07, 2012 1:22 pm

Well I ran the boat and after having the carb Rebuilt I have lost almost 500 rpm. Was turning 3k now 2500. The more money I spend on this boat the worse it gets. Who's the best around Oviedo that could work on this thing for me. Much appreciated.

rhodes · **Posted:** Mon May 07, 2012 5:21 pm

Check to see if carb. is going wide open.

junebug · **Joined:** Mon Apr 25, 2011 6:40 pm **Posts:** 191

rhodes wrote:

Check to see if carb. is going wide open.

Exactly..When carb was reinstalled the Throttle cable probably was'nt properly adjusted..

Chipper · **Posted:** Wed May 09, 2012 12:00 pm

Danny Oliver. Get ahold of diamond back airboats. They know how to get ahold of him. Best of luck :salute:

BHB · **Posted:** Wed May 09, 2012 2:39 pm

Danny's helped me out before, great guy, just to far away

Whistle at idle and backfire

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