Kawasaki FD750D-AS04 running poorly

SeniorCitizen

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JD X350 with 180 hrs. running so bad while mowing i didn't think it would make it back to the shop . Pulled original plugs and replaced with what the Auto supplier referenced the NGK to Champion that I ask for . I;ve never had a engine start so fast when the 1st piston went to compression .
 

ILENGINE

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JD X350 with 180 hrs. running so bad while mowing i didn't think it would make it back to the shop . Pulled original plugs and replaced with what the Auto supplier referenced the NGK to Champion that I ask for . I;ve never had a engine start so fast when the 1st piston went to compression .
The last 3 Kawasaki engines that I tried Champion plugs in wouldn't start hot. I won't touch another Champion if I can avoid them.
 

Auto Doc's

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For most V-twin applications I use Champion RN12YC or RN14YC and have not had issues with them in years.

The ones I do not like just have the word "Torch" printed on them. They have ruined a few coils especially on push mowers.

With Stihl 2-stroke engines I get the best performance out of NGK plugs.
 

ILENGINE

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Did you replace fuel pump yet? If so what was the outcome?
Fuel pump replaced but no change in running. I am going to try to swap the carb when it gets here Monday and see what happens. I did test the pump I took off and it wouldn't hold pressure
 

ILENGINE

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Fuel pump replaced but no change in running. I am going to try to swap the carb when it gets here Monday and see what happens. I did test the pump I took off and it wouldn't hold pressure
Got the Amazon carb installed, which is not my desired choice, due to quality control in most cases, but anyway the new carb allowed the engine to fire up and run smooth from full throttle down to an idle, which would never idle before, and will even fire back up without the choke applied. So there is definitely something goofy about the carb.
 

Auto Doc's

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Hello ILENGINE,

I've had pretty good luck with aftermarket clone carburetors in recent years. A lot of original ones are no longer available. I have had better results with Ebay then I have Amazon though.

Some OE carburetors get blocked air bleed passages over time that no amount of cleaning will correct. Along with that, the throttle shafts wear out the housings, especially in sandy/dusty conditions. Any stray air beyond the choke plate or before the venturi and a carburetor will not meter the fuel correctly for the engine to run properly.

Glad to hear you got it running well.
 

slomo

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Got the Amazon carb installed, which is not my desired choice,
Yup yup.

I found not to buy the cheapest knock off carb listed on fleabay for example. Say the cheapest listing is 25 bucks. I get the 35 dollar one. Had good luck doing this.

Used to get the cheapest listing. Had several problems that I corrected myself.
 
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