Author Topic: New Topic! Harbor Freight 420cc Clone  (Read 16132 times)

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Offline cubcadet70

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New Topic! Harbor Freight 420cc Clone
« on: July 27, 2012, 07:03:25 pm »
Post some feedbacks about these engines! Worth it or not? I asked in another tread while back about the 390cc ones but they are no longer available! So post away!!!

Offline big jerm

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Re: New Topic! Harbor Freight 420cc Clone
« Reply #1 on: July 27, 2012, 11:11:28 pm »
I saw this on a mower at tractor supply this week
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Offline cubcadet70

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Re: New Topic! Harbor Freight 420cc Clone
« Reply #2 on: July 27, 2012, 11:20:20 pm »
Interesting.... Wonder if any GX390 performance parts will fit these things? Would be good for the mower racers!

Offline Ron Atchison/A.C.E. Race Engines

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Re: New Topic! Harbor Freight 420cc Clone
« Reply #3 on: July 27, 2012, 11:22:59 pm »
Interesting.... Wonder if any GX390 performance parts will fit these things? Would be good for the mower racers!

 The flywheel, heads, cranks and cams on most will interchange although, some of them wont. BlueMax parts will for sure.
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Offline coreylewellen

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Re: New Topic! Harbor Freight 420cc Clone
« Reply #4 on: July 29, 2012, 09:33:12 am »
So far its been an awsome engine  new cam flywheel valves and push rods springs and connecting rod left balancing wheight in turning it about 7 grand. Ive only ran it about 6 hours but it runs consistantly. Only thing that i am having problems with is the stock carb. My fuel pump will over ride the float and dump fuel. Havent had a drop of oil in my puke tank.  I would recomend this engine to anyone who wants to run a horizontal engine I bought  all of the components from affordable go karts
what do you mean it doesn't fit, did you use the hammer?

Offline Mayhem#8

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Re: New Topic! Harbor Freight 420cc Clone
« Reply #5 on: August 01, 2012, 11:58:14 pm »
I have the 420 preditor engine, it ran good for a while but the weak point is the rod my rebuild has a arc rod in it and is flawless now. My advice is if you get one change the rod out.

Offline trukman

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Re: New Topic! Harbor Freight 420cc Clone
« Reply #6 on: August 10, 2012, 10:30:29 am »
Where did you get the rod.
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Offline Cromwell C4

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Re: New Topic! Harbor Freight 420cc Clone
« Reply #7 on: August 10, 2012, 01:56:50 pm »
Where did you get the rod.

ARC racing. They sell a stock length billet rod. You can use the stock piston, or Parsons Racing Supply sells aftermarket pistons in flat top or dome dop with valve reliefs. Mike Clements sells a .500" longer billet rod/ arias piston combo that works well. Just a little expensive
Tyler Cromwell - Cromwell Racing Engines - Specializing in Briggs Vanguard and Kohler Command V-twin engines, and Honda/Clone singles from mild to wild! Built to win, Engineered to last.

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Offline Darkviper

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Re: New Topic! Harbor Freight 420cc Clone
« Reply #8 on: August 10, 2012, 02:03:51 pm »
Is that 420cc predator even legal to use in lawn mower racing. The one they sell at Harbor Freight.
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Offline cycloneracer

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Re: New Topic! Harbor Freight 420cc Clone
« Reply #9 on: August 10, 2012, 03:04:19 pm »
Is that 420cc predator even legal to use in lawn mower racing. The one they sell at Harbor Freight.

Not in FX.  It is too big. 
Sorry.  It is legal.  465cc max.  Thought it was under 400. 
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Offline trukman

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Re: New Topic! Harbor Freight 420cc Clone
« Reply #10 on: August 17, 2012, 11:27:21 am »
Where can i get Gaskets for a 420 HF. Need a head gasket.
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Offline Jim Knutson

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Re: New Topic! Harbor Freight 420cc Clone
« Reply #11 on: August 17, 2012, 11:53:49 am »
not sure on the 420cc, but for the 390cc you can use clone, or honda gaskets.
If you quit when you're behind, you will never win.

Offline Sherman Underwood

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Re: New Topic! Harbor Freight 420cc Clone
« Reply #12 on: February 19, 2013, 06:38:03 pm »
Where can i get Gaskets for a 420 HF. Need a head gasket.

LCT  liquid combustion technology.....they make that motor for HF.... there web is www.lctusa.com
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we are located @ 1472 Northside rd Elizabeth City NC 27909  stop on by..!!!!

I'm a Briggs & Kolher Master tech....mower mechanic for 18 plus years...!!!!

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