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 "The Rat" 12.5 HP Kohler swaped Huskee 4200 LT MTD

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FatMike
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Fastman
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"The Rat" 12.5 HP Kohler swaped Huskee 4200 LT MTD - Page 2 Empty
PostSubject: Re: "The Rat" 12.5 HP Kohler swaped Huskee 4200 LT MTD   "The Rat" 12.5 HP Kohler swaped Huskee 4200 LT MTD - Page 2 Icon_minitimeMay 11th 2022, 6:20 pm

well see this engine has a mechanical fuel pump and it is trashed and the steal fuel lines from the pump to the carb ar trashed too so right now it is just gravaty fed and this carb is for a pump fed engine so it probaly isnt geting enough fuel

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Brianator
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"The Rat" 12.5 HP Kohler swaped Huskee 4200 LT MTD - Page 2 Empty
PostSubject: Re: "The Rat" 12.5 HP Kohler swaped Huskee 4200 LT MTD   "The Rat" 12.5 HP Kohler swaped Huskee 4200 LT MTD - Page 2 Icon_minitimeMay 11th 2022, 8:41 pm

Murraymountain wrote:
That could be the case, but I’ve been dealing with similar issue with my Kohler swapped Murray LT. I put 2 brand newish carbs on it and it did the same thing. Would fall flat on its face if you tried to up the throttle at a normal pace. Just couldn’t get it dialed in for anything. Went to the junkyard and found an original Kohler carb and threw that on it and now it runs perfectly! So I’m betting on the carb cause these new cheap Kohler ones always seem to have a problem.

That’s my just my experience with them + an extra 2 cents.

You should run the experiment with one of the carbs that ran crappy, get a pin vise and open up the main jet a little and test, open the pilot (if possible) and test. Open them up a little at a time and I bet you'll see improvement, I've done it successfully! Any time you imporve airflow with an intake and or exhaust you'll need to fatten up the jetting a little, especially with newer built carbs that were EPA approved and run on the lean side.

Fastman wrote:
well see this engine has a mechanical fuel pump and it is trashed and the steal fuel lines from the pump to the carb ar trashed too so right now it is just gravaty fed and this carb is for a pump fed engine so it probaly isnt geting enough fuel
Diaphragm and spring kits are available for the Kohlers for under $20 but the 4 holes need to be elongated towards the center by about a 1/8" each if you have a old school aluminum pump. I think the diaphragm kits were designed for the new, plastic replacement pumps but I've never been able to confirm that physically, I did rebuild an old aluminum one though.
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PostSubject: Re: "The Rat" 12.5 HP Kohler swaped Huskee 4200 LT MTD   "The Rat" 12.5 HP Kohler swaped Huskee 4200 LT MTD - Page 2 Icon_minitimeMay 14th 2022, 11:47 pm

Finaly got to drive it with the big pulley on it (I had to put the original engine pulley on it at first cause I didn't have a belt small enough) and after driving for about 15 minutes it blew up the brand new uper drive belt that I had just got this morning, so when I buy a new one imma buy a "high power" one from O'Reilly
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"The Rat" 12.5 HP Kohler swaped Huskee 4200 LT MTD - Page 2 Empty
PostSubject: Re: "The Rat" 12.5 HP Kohler swaped Huskee 4200 LT MTD   "The Rat" 12.5 HP Kohler swaped Huskee 4200 LT MTD - Page 2 Icon_minitimeMay 14th 2022, 11:48 pm

It also did about 26 mph with the factory sized back tires
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PostSubject: Re: "The Rat" 12.5 HP Kohler swaped Huskee 4200 LT MTD   "The Rat" 12.5 HP Kohler swaped Huskee 4200 LT MTD - Page 2 Icon_minitime

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