B&G Engine on Generac 4000 generator

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  #1  
Old 06-21-14, 11:49 AM
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B&G Engine on Generac 4000 generator

I've had to tear down and thoroughly clean the Nikki carb on this generator. Biggest problem was gas flow and finally discovered that the needle valve attached to the float was completely gummed up. Pulled it out and cleaned the needle and its chamber and am now getting fuel to the carb and the engine. Stupidly, I didn't note the arrangement of the governor wire and throttle control rod. I put it back together like I thought it should be and started the engine but it runs at a high rate and doesn't seem to want to slow down to idle. I connected both the wire and the rod (with the "S" on the end) to the right hole in the control fitting on the carb (looking down on top of it) and the high speed was the outcome.

After all this I found a short rubber tube (about 1/2") on my workbench. I know about the small rubber tube that others have remarked on and I know I put it back in its correct location but this thing is something else. I am not even sure it came out of the carburetor!

So, I have 4 questions: is this rubber tube part of the carb? If so, where the hell does it go? And, what is the correct connection for the governor wire and throttle link? Finally, what else could be causing the engine to run so fast?

Answers to any or all of these questions will be greatly appreciated as I live here in FL and want to get this generator working properly before the "big one" hits us this hurricane season.
 
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Old 06-21-14, 01:19 PM
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Post the engine model, type and trim usually found stamped in the metal shroud by the spark plug or on a tag by the muffler. Have a good one. Geo
 
  #3  
Old 06-23-14, 08:58 PM
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The engine is a 7.8HP with a bunch of numbers at various locations. Best I can do:
Generac 01645
S/N 1010718895
Engine ID 0042751
DISP. 216 cc

None of these #'s means anything to me. And I don't really think they are particularly relevant to my question, which pertains to the Nikki carb. I have cleaned and reassembled the carb. and got the generator started but am not sure I have the throttle and governor linkages reconnected properly. My latest setup has both the governor wire and throttle in the left hand hole (standing in front of the engine and looking down on top of the carb.) but I suspect this is wrong. The prior factory setup had the governor wire in the hole on the right but I am not sure about the throttle linkage. Tomorrow I will move the governor wire over to that hole and see if that makes the generator run normally.

If you have any solid advice or direction to give please share it, this little piece of equipment has me buffaloed.
 
  #4  
Old 06-24-14, 01:30 PM
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Here are a couple links that might help, first is a forum discussion, second is pictures. Have a good one. Geo

Generac 7.8Hp throttle plate connection - SmokStak

http://www.justanswer.com/small-engi...7-8-motor.html
 
  #5  
Old 06-24-14, 09:05 PM
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I have the same generator. I can take some pictures tomorrow.
 
  #6  
Old 06-28-14, 01:07 PM
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Justin -

I would be very grateful to see a shot or two of the connexion(s)
 
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Old 06-28-14, 01:11 PM
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Geo.

I looked at the response from SmokStak. If I connect the two linkages to the hole in the plate as he describes it the engine races and I cannot control it.

The tech drawing is interesting but the connection is not clear enough for me to determine which hole it is connected to.

Tracking this info down has been very frustrating and your information helped but I still think I am not doing something right. Is it possible that something else is malfunctioning?
 
  #8  
Old 06-29-14, 07:52 AM
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If it is app.2 mm. Wide and 5 mm. Long black rubber it belongs to your carb and it goes in the main jet( you have a Nikki carb right?) It is very easy to blow this away cleaning the carb. There is another post on this : search for Generac 4000 ( Nikki)
 
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