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Rebuit carb, has "stutter" under load.


 
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Inno
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Joined: 11 Nov 2009
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Location: NW Ontario Canada, Near Beautiful Rainy Lake

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PostPosted: Thu Sep 20, 2012 5:46 pm    Post subject: Rebuit carb, has "stutter" under load. Reply to specific post Reply with quote

Just put a freshly rebuilt carb on my 202 (Z134 Continental). It is the carb that was on the TO-35 I just bought but I put the 202 carb on the 35 to get it on the trailer and home so I figured why bother swapping them back, I'd just put the fresh rebuild on the 202. When I say rebuild I disassembled and soaked in carb cleaner for 2 days, cleaned, blew out and re-assembled with a new full kit. I had some trouble removing the idle air screw and ended up drilling it out but didn't damage the threads as far as I can tell. I re-tapped just to be sure.
So I put it on the 202, did a rough setting just to get it warmed up to operating temp. to adjust it properly. It idles great and throttles up pretty smoothly but when you have it at say half to 3/4 or even full throttle and put it under a sudden load (high gear 2nd and let the clutch out too fast or make a sudden move with the backhoe), anything that makes the governor snap the throttle quickly, it makes a little cough before revving up. Like it has to clear it's throat before it roars. It never did this with the other carburetor in place.
Any ideas? I know on the Marvel Schebler carbs they have an "accelerating well", or at least that's what I have read in an old MS document I found online. It's purpose, much like the accelerator pump on vehicle carburetors is to provide a quick shot of extra fuel for sudden acceleration. I'm wondering if this could have something to do with it?
 
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Jerry/MT
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Location: Western Montana

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PostPosted: Thu Sep 20, 2012 7:32 pm    Post subject: Re: Rebuit carb, has stutter under load. Reply to specific post Reply with quote

Trying going a notch richer with the power jet adjusting screw.
 
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Inno
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PostPosted: Thu Sep 20, 2012 7:33 pm    Post subject: Re: Rebuit carb, has stutter under load. Reply to specific post Reply with quote

I tried that about a quarter turn at a time, didn't seem to help.
 
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John(UK)
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PostPosted: Fri Sep 21, 2012 7:53 am    Post subject: Re: Rebuit carb, has stutter under load. Reply to specific post Reply with quote

I have emailed you direct...John(UK)
 
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Jerry/MT
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PostPosted: Fri Sep 21, 2012 9:13 am    Post subject: Re: Rebuit carb, has stutter under load. Reply to specific post Reply with quote

Did you take great care in setting the float level? That sets the level of gas in the acceleration well.
 
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Inno
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PostPosted: Fri Sep 21, 2012 9:14 am    Post subject: Re: Rebuit carb, has stutter under load. Reply to specific post Reply with quote

I was pretty sure I did, I measured 1/4" from the gasket to the float and it looked to be parallel to the body of the carb.
Certainly something to look at.........thinking now..........thinking, measured 1/4" but was it COMPLETELY parallel..........might have to take it off and have a look.
 


Last edited by Inno on Fri Sep 21, 2012 9:15 am; edited 1 time in total
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