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use of carb cleaner

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canadian.outdoor.sales(at
Guest

Posted: Wed May 28, 2014 2:09 pm Post subject: use of carb cleaner

I have an m14p installed on a Moose and wondering if a non ethanol  carb cleaner can be used on the carb. I have developed a stumble when pulling  power off in the descent. Usually around 18"mp and 2000rpm. The stumble quits if  I continue to decrease power or increase rpm. I am thinking it is when the carb  is transitioning from high to low speed jet. I have blocked the accelerator jet  as per the Kimble mod. No stumble now when applying power. Any opinions are  appreciated.

Best

Mike Mahoney

   [quote][b]

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mark.bitterlich(at)navy.m
Guest

Posted: Wed May 28, 2014 3:56 pm Post subject: use of carb cleaner

Well you asked for an opinion.



I do not agree with the "Kimble Mod" of blocking the accelerator jet.  This was something that was the E Ticket Ride a long time ago before folks realized that this jet had a way to be ADJUSTED, by using different jets that came in a PACK.  Obtaining the accelerator jet kit allows you to tailor the carb to the engine.  This issue seemed to primarily be with the M-14PF engine and less so the M-14P.  Either way, the jet kit eliminates the problem properly, but if you are happy with what you have done, so be it.



I would not recommend ANY kind of "carb cleaner".   This is not a float fed carb, with a venturi and jets.  This is a pressure carb that is very close to fuel injection principles.  It is.. in my humble opinion,  very unlikely that your carb is at fault here if it has been working fine.. especially pulling the power BACK.



I would suspect instead some kind of intake leak.   For example, if you have the intake drain kit installed... look that puppy dog over CAREFULLY for any cracks or leaks.   The stumble sounds to me like an engine going lean as you come out of the supercharger and start to come back to ambient or below.   An intake leak of any type here could cause that.   Intake drains, tubes, you name it.



One of the things you can do is to get some WD-40, or ... heaven forbid starter fluid.... I'm pretty scared of that stuff.... and spray it around the intake at idle and listen for change in engine sound.  An intake leak will suck that stuff up and you'll hear it in the engine sound.  Starter fluid works, but man... scary stuff.  A compression check on all the cylinders is also called for in case you have a really weak cylinder which also might go lean with throttle pullback.



I would listen to some of the better engine experts on this list.  Dennis, George Coy, M-14P, etc.   I am not a Russian engine super duper mechanic.   I have been around same and have learned from them.   I just doubt that this is a carb issue based on my 14 years or so being around them.



Mark



________________________________

From: owner-m14pengines-list-server(at)matronics.com [owner-m14pengines-list-server(at)matronics.com] on behalf of canadian.outdoor.sales(at)gmail.com [canadian.outdoor.sales(at)gmail.com]

Sent: Wednesday, May 28, 2014 6:10 PM

To: m14pengines-list(at)matronics.com

Subject: use of carb cleaner



I have an m14p installed on a Moose and wondering if a non ethanol carb cleaner can be used on the carb. I have developed a stumble when pulling power off in the descent. Usually around 18"mp and 2000rpm. The stumble quits if I continue to decrease power or increase rpm. I am thinking it is when the carb is transitioning from high to low speed jet. I have blocked the accelerator jet as per the Kimble mod. No stumble now when applying power. Any opinions are appreciated.

Best

Mike Mahoney

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GeorgeCoy

Joined: 02 Dec 2010
Posts: 310

Posted: Thu May 29, 2014 4:09 am Post subject: use of carb cleaner

I agree it is probably an intake leak. Instead of wd40 or starter fluid, use

an unlit propane torch. It will make an RM change as well .  Don't forget

the manifold pressure gages and lines as well as suspects.

George

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mike63

Joined: 23 May 2014
Posts: 2

Posted: Thu May 29, 2014 5:44 am Post subject: Re: use of carb cleaner

I checked both ends of all the intake tubes with WD and found nothing. I will give the propane a shot and include the drain kit and MP line.

thanks

Mike

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dsavarese0812(at)bellsout
Guest

Posted: Thu May 29, 2014 5:50 am Post subject: use of carb cleaner

Also check the primer line since it also             connects directly into the supercharger               case.

               Dennis

                     	  Quote: 	
		  A. Dennis Savarese

334-285-6263

334-546-8182 (mobile)

www.yak-52.com

Skype - Yakguy1 	
       On 5/29/2014 8:44 AM, mike63 wrote:

     

     [quote]        	  Quote: 	
		  --> M14PEngines-List message posted by: "mike63" <canadianoutdoorsales(at)gmail.com> (canadianoutdoorsales(at)gmail.com)



I checked both ends of all the intake tubes with WD and found nothing. I will give the propane a shot and include the drain kit and MP line.

thanks

Mike





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mike63

Joined: 23 May 2014
Posts: 2

Posted: Thu Jul 17, 2014 2:07 pm Post subject: Re: use of carb cleaner

Well I retightened all of the intake tubes and tightened all of the nuts between intake ring and the nose case and accessory case and the stumble has cleared up. 

thanks for the help

Mike Mahoney

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