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#Post#: 58289--------------------------------------------------
Re: Redmax 621
By: Chris-PA Date: May 27, 2015, 7:11 pm
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Thanks.
BTW, there was some discussion about the G621 being heavy in
early posts upthread - my clone is 12.4lb, and it is slightly
heavier than the real one.
#Post#: 58290--------------------------------------------------
Re: Redmax 621
By: 660magnum Date: May 27, 2015, 8:08 pm
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My 6.2 is actually Zenoah G62 model airplane engine. The most
common part about it and the 6.2 chainsaw is the cylinder and
piston.
That Chinese company made G62 model airplane engine clones too
for a very short while. I've seen pictures and for sale ads but
never a actual clone engine.
#Post#: 59900--------------------------------------------------
Re: Redmax 621
By: nenicu Date: July 26, 2015, 10:59 am
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Hello boys. I have a Zenoah 621 i want to port. Anybody has
some pics of a ported cylinder and piston? Thanks!
#Post#: 59901--------------------------------------------------
Re: Redmax 621
By: 660magnum Date: July 26, 2015, 11:46 am
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IIRC the 621 is a open port engine?
#Post#: 59903--------------------------------------------------
Re: Redmax 621
By: Chainsawrepair Date: July 26, 2015, 3:43 pm
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[member=325]EHP[/member] used to port them. So you might ask him
about them.
#Post#: 59968--------------------------------------------------
Re: Redmax 621
By: Chris-PA Date: July 28, 2015, 11:39 am
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I have not yet seen a real G621 cylinder, but my clone was open
port. The Chinese usually do not change the designs unless they
have to, and anyway Zenoah sells both a G621 and aG6200, and I
suspect the G6200 is the same as my clone.
My clone required only some work to the intake port and a gasket
delete (and muffler mod) - cutting the base would have been
better yet but I was lazy. I ended up at 0.035" squish, but the
piston is domed and the combustion chamber is very small, so I
suspect compression is pretty good anyway (I have no gauge but
it feels healthy). It runs very well.
#Post#: 59969--------------------------------------------------
Re: Redmax 621
By: 660magnum Date: July 28, 2015, 12:46 pm
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Looks like my Zenoah G62 which has a Husqvarna labeled cylinder
on it
#Post#: 60016--------------------------------------------------
Re: Redmax 621
By: Chainsawrepair Date: July 30, 2015, 9:07 am
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[member=1697]Chris-PA[/member] here is a oem redmax 621
cylinder to compare in pics.
#Post#: 60048--------------------------------------------------
Re: Redmax 621
By: Chris-PA Date: July 31, 2015, 7:31 am
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Looks identical, just a cleaner casting. I know it's an open
transfer cylinder, but it sure does run well.
#Post#: 60075--------------------------------------------------
Re: Redmax 621
By: EHP Date: August 1, 2015, 9:42 am
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the 621 takes well to porting just remember to port more for
torque than rpms , its a cheap motor but you will be surprised
at how much power you pick up , Donot go wild on porting as you
can over port these jugs pretty quick . You want your max power
at 10,500 or so , they are not a cookie cutter but once ported
they sure will cut cookies or firewood for a long time
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