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#4706590 - 03/25/18 05:07 PM HF gen set dropped exh valve
nascarnation Offline


Registered: 04/30/04
Posts: 818
Loc: Indiana
My neighbor gave me a non-running HF 4000W gen set (212 cc Chinese motor).
After cleaning the carb without success, I put on a new 11 dollar (!) carb and it ran fine. Pulled two 1500 watt heaters as a test load with no problem.

For about 15 minutes .... and then it dropped an exh valve.
Surprisingly the cylinder bore is undamaged, and shows basically no wear from use, and the piston is fine also. The cylinder head took all the damage from the valve crash.

Help me choose one of 3 options:

1) Buy a new 99 dollar HF engine and swap the side housing and crankshaft from my existing engine (the 99 dollar engines have a straight output shaft on the crank, the gen set ones have a tapered shaft).

2) Buy a new head and valves (45 bucks or so?), install on my engine.

3) Give it away to somebody else.

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#4706593 - 03/25/18 05:11 PM Re: HF gen set dropped exh valve [Re: nascarnation]
gathermewool Offline


Registered: 01/09/09
Posts: 6064
Sounds like you have the skill to refurb this thing.

I'd buy a new head, if you feel comfortable with the swap. As you said, the piston/bore look fine. If it wasn't drinking oil in the short time you used it, I'd be comfortable with just a head.

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#4706595 - 03/25/18 05:11 PM Re: HF gen set dropped exh valve [Re: nascarnation]
skyactiv Online   content


Registered: 03/02/13
Posts: 4522
Loc: The Midwest
Set it out with the trash and don't worry about it. Put a note on it describing the problem.
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#4706602 - 03/25/18 05:20 PM Re: HF gen set dropped exh valve [Re: skyactiv]
gathermewool Offline


Registered: 01/09/09
Posts: 6064
Originally Posted By: skyactiv
Set it out with the trash and don't worry about it. Put a note on it describing the problem.


I never took you for a quitter! boxing Coffee2

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#4706603 - 03/25/18 05:20 PM Re: HF gen set dropped exh valve [Re: nascarnation]
Chris142 Offline


Registered: 06/05/03
Posts: 16978
Loc: Deplorable in apple valley, ca
Maybe find one that has other problems. Like one that runs but wont make power
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#4706606 - 03/25/18 05:25 PM Re: HF gen set dropped exh valve [Re: Chris142]
gathermewool Offline


Registered: 01/09/09
Posts: 6064
Originally Posted By: Chris142
Maybe find one that has other problems. Like one that runs but wont make power


That sounds worse.

If the genny on this thing works (seems like it took 3kW easily, from the OP), and the engine looks to be in good shape, then replacing the head seems like a logical choice.

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#4706615 - 03/25/18 05:34 PM Re: HF gen set dropped exh valve [Re: nascarnation]
Leo99 Offline


Registered: 03/30/14
Posts: 3118
Loc: NJ
What are you going to do with the generator? Will you use it as an emergency generator or do you already have one of those? Don't spend money on it if it's just going to collect dust after you repair it.
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#4706619 - 03/25/18 05:40 PM Re: HF gen set dropped exh valve [Re: Leo99]
gathermewool Offline


Registered: 01/09/09
Posts: 6064
Originally Posted By: Leo99
What are you going to do with the generator? Will you use it as an emergency generator or do you already have one of those? Don't spend money on it if it's just going to collect dust after you repair it.


Good point!

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#4706620 - 03/25/18 05:42 PM Re: HF gen set dropped exh valve [Re: nascarnation]
Miller88 Offline


Registered: 04/09/08
Posts: 12755
Loc: Onondaga County
I think buying a different head, if it's easily attainable, is the best option.
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#4706691 - 03/25/18 06:41 PM Re: HF gen set dropped exh valve [Re: nascarnation]
NHGUY Offline


Registered: 10/09/11
Posts: 5062
Loc: USA
I'd go Briggs and not look back.

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#4706776 - 03/25/18 07:44 PM Re: HF gen set dropped exh valve [Re: NHGUY]
nascarnation Offline


Registered: 04/30/04
Posts: 818
Loc: Indiana
Originally Posted By: NHGUY
I'd go Briggs and not look back.


Well I have 3 go karts (for 5 grandchildren LOL) all with HF 212 motors. So I've kind of standardized on 99 dollar power...although I'd guess the reliability in the karts is mostly due to an easy duty cycle. I really wish the gen set used the "normal" version crankshaft, then they'd all be interchangeable.

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#4706793 - 03/25/18 07:57 PM Re: HF gen set dropped exh valve [Re: nascarnation]
Donald Offline


Registered: 03/21/04
Posts: 20569
Loc: Upstate NY
Originally Posted By: nascarnation
Originally Posted By: NHGUY
I'd go Briggs and not look back.


Well I have 3 go karts (for 5 grandchildren LOL) all with HF 212 motors. So I've kind of standardized on 99 dollar power...although I'd guess the reliability in the karts is mostly due to an easy duty cycle. I really wish the gen set used the "normal" version crankshaft, then they'd all be interchangeable.


Most generators have a tapered shaft. Its a PIA to get apart.
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#4706807 - 03/25/18 08:09 PM Re: HF gen set dropped exh valve [Re: nascarnation]
chainblu Offline


Registered: 06/26/11
Posts: 580
Loc: Florida
I'd say option number 2. Assuming the parts are obtainable, $45 (or so) isn't bad for an otherwise free genny, even a Chinese one.

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#4706827 - 03/25/18 08:24 PM Re: HF gen set dropped exh valve [Re: Chris142]
Linctex Offline


Registered: 12/31/16
Posts: 6186
Loc: Waco, TX
Originally Posted By: Chris142
Maybe find one that has other problems. Like one that runs but wont make power


Yes - - - buy it cheap and rob the parts you need.

Sell the rest on craigslist

Just change the head.

The engines are on craigslist all the time CHEAP!!! I see them for sale (RUNNING!!) for $35-40
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#4706829 - 03/25/18 08:26 PM Re: HF gen set dropped exh valve [Re: nascarnation]
Linctex Offline


Registered: 12/31/16
Posts: 6186
Loc: Waco, TX
Originally Posted By: nascarnation

Help me choose one of 3 options:

4) Buy a new 99 dollar HF engine and swap the head


then sell the rest of the engine (minus the head) on ebay or craigslist
_________________________
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(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."

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