Nikki carb questions

J

jlwoods99

Member
So I've got my Troybilt running after catching it on fire, running marginally well. It's surging until I engage, the mower. Also the choke isn't pulling off once I start it and cut the throttle back. This has a Nikki carb, I thought the draw through the carb would open the choke up so possibly gummed up still, or can the spring be tightened up. It's a B&S 31c707 0603 B2 090727ZA.

Thank you..
 
As long as the spring is still intact, I have seen some that the intake elbow got out of shape and would not let the choke open back up. try loosening the intake elbow and push up on it and tighten it to see if that helps. If not take it off and trim a little off the inside of the elbow usually the top side..
 
jlwoods99 said:
So I've got my Troybilt running after catching it on fire, running marginally well. It's surging until I engage, the mower. Also the choke isn't pulling off once I start it and cut the throttle back. This has a Nikki carb, I thought the draw through the carb would open the choke up so possibly gummed up still, or can the spring be tightened up. It's a B&S 31c707 0603 B2 090727ZA.

Thank you..
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Those “paper clip” looking choke linkages sometimes get bent and hang up. You can try fiddling with the linkage until it releases smoothly. Option two is to manually release the choke linkage yourself once engine is running.
 
Or it can be the plastic choke vane shaft itself that is binding.

jlwoods99 said:
Any idea on why the surging until I get it under load?
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It is a lean burn issue in the Nikki idle circuit. Some these Nikki has a restricter jet in the idle circuit that is too small so you can't even adjust the mixture without modifying the jet.

This year alone I done come three carbs that I had modify that jet. But I have the micro drill bits for this purpose.
 
if it is a plastic manifold, you may have a warp between it and the carb, allowing just enough air in that the idle mixture is affected, or it may be debris in the idle jet.
 
sgkent said:
if it is a plastic manifold, you may have a warp between it and the carb, allowing just enough air in that the idle mixture is affected, or it may be debris in the idle jet.
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I have never seen either one manifolds warped.
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saw one on a podcast recently. It appeared that the whole engine had gotten really hot at some time from dirt and clippings that built up.
 
Well podcasts is something I don't listen to so you could have seen something I never experience in my shop. But there was one here that was damage was from an engine fire. That should never happen but the user was mowing leaves and piled the engine compartment full which got ignited by the muffler. Mower was destroyed and users was the fuel tank didn't explode. It sorta the user that did the same which cost $2300 to repair on a $4000+ JD rider. ANd he was asking if the warranty covered that. All I could is that the warranty doesn't cover stupid.
 
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