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Unread 04-06-2013, 12:33 PM   #1
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Default HF 420cc clone engine question thread

Hey guys

Now I'm sure there are a million threads talking about these engines, But I would like to start a dedicated thread to these engines where people can get any info they want right in one spot.

So, to get the ball...does anyone know the factory camshaft specs for the predator 420?
I plan to do a full engine build and before I buy a cam for mine, I would like to know the factory specs as a comparison.

Thanks for all of your help clone guru`s!

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Unread 04-06-2013, 03:16 PM   #2
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Default Re: HF 420cc clone engine question thread

The cam info I got when cam-doctoring it is:

Intake Duration : 212 @ .050"
Exhaust Duration : 200 @ .050"
Intake Lift = .259"
Exhaust Lift = .235"
110 LSA

The engines have a huge 42cc chamber and only make 8:1 compression but I like the port shape better than the duromaxes.

Overall, better engine than the Duromax, but not by much.
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Unread 04-06-2013, 03:29 PM   #3
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You just keep popping up everywhere.

Thanks for the fast reply. Best way to up the compression?

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Unread 04-06-2013, 03:34 PM   #4
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As I should assume, milled and ported head would do the trick.

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Unread 04-06-2013, 04:07 PM   #5
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Default Re: HF 420cc clone engine question thread

If you plan on keeping the stock rod, mill the head .100" and thatll put you around 10.25:1 and port it. Thats about the best you are going to get out of a stock rod/valvetrain/cam setup.


Good for 91 octane gas.

-Geoff
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Unread 04-06-2013, 04:36 PM   #6
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Swapping everything except piston, crank, and block. Looking to make 30hp on premium pump gas.

If you could make a list of parts from your site that would be great. I already got one of those carbs we talked about.

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Unread 04-06-2013, 04:59 PM   #7
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Default Re: HF 420cc clone engine question thread

Billet Rod
SS Valves
1.25:1 Shaft Rockers
HD Pushrods
Billet Retainers & Locks
Dual Valve Springs
Ported & Milled head .100"
8 Degree Timing key
Torque Cam (246 - .330 - 104LSA)
.026" MLS Head Gasket
32mm Intake Manifold

You could assemble it with a hole in the piston and still make 30hp.
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Unread 04-06-2013, 05:09 PM   #8
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And you sell all of that through your website I assume?

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Unread 04-06-2013, 07:12 PM   #9
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Default Re: HF 420cc clone engine question thread

Yes I do!

Im out of stock on Cams right now though, my shipment should be in Wednesday.

-Geoff
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Unread 04-06-2013, 07:38 PM   #10
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Okay, that's fine.

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