VNV1967
Just wonder why Generac uses Mechanical Lifters instead Of HYD Lifters.

Seen's like  a no brainer to me as most all cars now a day use HYD Lifters.
There must be a reason why Generac uses them.

Maybe some one here could give me an Explanation?
I think "Kohler" uses them. Seems the way to go rather then beat your brian's out trying to adjust valves.
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BrianMartin
They are being phased out with newer engine designs.. The new 13kw and 16kw share a new 816cc engine with hydraulic lifters. I'm sure the next version of the 990cc engine will have them as well. 
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78buckshot
Solid lifters are less expensive, also by adjusting in different lash you can change the torque and power curve, I don't know at what RPM the valves on these would start to float but solids would not allow zero lash if they are maintained. Just my 2 cents, not saying hydraulics won't be welcomed.
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VNV1967
I know from my own experience that my 502 red line is 5500 RPM and their is no Valve Float. I think the running RPM of the Generac engines is well below that as far as float goes. I can't see how much more it would add to the cost maybe by $50.00 bucks or so for 4 HYD lifters as far as Generac's coast. 

Here's an blow up view of the Kohler Cyl head (14 KW) and related parts. Note the HYD lifter and push rod and rocker arm assembly. Looks simple enough. This Genny runs around $3600.00 roughly. Alot more then a Generac close class. Kohler.png
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Cobranut

Valve float just isn't a concern on these low rpm engines.

The reason hydraulic lifters take a redesign to install is they require pressurized oil to the liifter galley.
Many small engines don't have those passages, so it requires a new block design, whic adds significant costs.
whatever the reason, hydraulic lifters would be a big improvement, with no real downside.\

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VNV1967
I can understand that...makes sense. But I think Generac needs to move into the now and do has 
BrianMartin has stated.
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grsthegreat
the only downside that i think may occure is most engines with hydraulic lifters dont go from 0 to 3600 rpm in a second. i wonder how long it takes for the lifters to inflate .... i hear that the 16s are a bit noisy starting up.
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ALLEGRO
My 7178 16K genset is NOT noisy at startup.  In fact, there is no difference in sound dB level or sound-characteristic upon startup or while running.  I put off my purchase to get the updated model and am glad I did, if for nothing else but the reduced yearly maintenance.  
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