Author Topic: Redmax 621  (Read 3899 times)

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Offline Chris-PA

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Re: Redmax 621
« Reply #30 on: August 02, 2015, 10:59:05 am »
The timing on my clone was decent as it came, except for the intake.  I removed the gasket and lowered and widened the intake.  The timing (duration) ended up at:

E 160
I  159
T 122  (Blowdown at 19)

I left the exhaust port alone, and the final widths were:  Exhaust port = 54% of bore, Intake = 52%

It seems quite willing to rev, and I suspect the smallish carb is holding it back some.  It's got a very usable power band. 

Offline Chris-PA

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Re: Redmax 621
« Reply #31 on: August 02, 2015, 07:51:30 pm »
Here's the clone with a 20" bar in white oak, 3/8 full chisel.  For most of the time it's running about 10,300rpm.

https://youtu.be/AiEehRzrW7s

Offline Chris-PA

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Re: Redmax 621
« Reply #32 on: August 04, 2015, 04:11:18 pm »
That link looks screwy.  Trying this one: https://m.youtube.com/watch?v=AiEehRzrW7s&feature=youtu.be

Offline 660magnum

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Re: Redmax 621
« Reply #33 on: August 04, 2015, 04:21:01 pm »
Either one worked fine for me.
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Offline Cut4fun .

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Re: Redmax 621
« Reply #34 on: August 04, 2015, 05:04:23 pm »
1st one worked perfect that was embedded.

So is those 72cc ones on same crankcase as the 62cc?
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Offline Chris-PA

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Re: Redmax 621
« Reply #35 on: August 04, 2015, 07:46:37 pm »
Ok, it must just have been how it showed up on this phone.   I'm pretty sure the 72cc is the same case - I'd like to see the cylinder and if the carb is the same size.  The 62cc carb is 15.08mm, which is marginal for that displacement.

Offline nenicu

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Re: Redmax 621
« Reply #36 on: September 01, 2015, 10:47:26 am »
 OK. I have a Redmax 621 and a 72 cc clone.  The clone crankcase is aluminium vs magnezium. A lot thicker than the original.The crank looks similar,the  cylinder and piston same shape but 50 mm bore. The case seems to have the blame for the weight diference. I don't have a 62 cc clone to compare,from pictures looks  like the case is  the same.

Offline Chris-PA

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Re: Redmax 621
« Reply #37 on: September 01, 2015, 09:22:36 pm »
OK. I have a Redmax 621 and a 72 cc clone.  The clone crankcase is aluminium vs magnezium. A lot thicker than the original.The crank looks similar,the  cylinder and piston same shape but 50 mm bore. The case seems to have the blame for the weight diference. I don't have a 62 cc clone to compare,from pictures looks  like the case is  the same.
What is the weight of the real G621?   I had expected the clone to be heavy but was surprised when it came in at 12.4lb (5.62kg).

Offline nenicu

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Re: Redmax 621
« Reply #38 on: September 02, 2015, 02:39:19 am »
The real thing[Redmax] is in pieces . From what i remember it was significant ligther compared to the clone[20 bar Redmax vs 22 Clone].Edt: i think 5kg .

Offline Cut4fun .

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Re: Redmax 621
« Reply #39 on: September 02, 2015, 12:52:02 pm »
Acres shows it being a heavy bugger. http://www.acresinternet.com/cscc.nsf/ed1d619968136da688256af40002b8f7/e37b2b8e095847de88256d0a000b0b6a?OpenDocument


Retail cost and years sold close? 89-99

G621AVS   1999   $660.00   
Engine Make:    Zenoah
   
Engine Size Cubic Centimeters:    62
   
Engine Size Cubic Inches:    3.78
Dry Weight:    14.9
   
Bar Oiler Type:    Automatic
   
Bar Length:    16
G621AVS   1999   $665.00   
Engine Make:    Zenoah
   
Engine Size Cubic Centimeters:    62
   
Engine Size Cubic Inches:    3.78
Dry Weight:    14.9
   
Bar Oiler Type:    Automatic
   
Bar Length:    18
G621AVS   1999   $670.00   
Engine Make:    Zenoah
   
Engine Size Cubic Centimeters:    62
   
Engine Size Cubic Inches:    3.78
Dry Weight:    14.9
   
Bar Oiler Type:    Automatic
   
Bar Length:    20
G621AVS   1999   $675.00   
Engine Make:    Zenoah
   
Engine Size Cubic Centimeters:    62
   
Engine Size Cubic Inches:    3.78
Dry Weight:    14.9
   
Bar Oiler Type:    Automatic
   
Bar Length:    24
G621AVS   1998   $660.00   
Engine Make:    Zenoah
   
Engine Size Cubic Centimeters:    62
   
Engine Size Cubic Inches:    3.78
Dry Weight:    14.9
   
Bar Oiler Type:    Automatic
   
Bar Length:    16
G621AVS   1998   $665.00   
Engine Make:    Zenoah
   
Engine Size Cubic Centimeters:    62
   
Engine Size Cubic Inches:    3.78
Dry Weight:    14.9
   
Bar Oiler Type:    Automatic
   
Bar Length:    18
G621AVS   1998   $670.00   
Engine Make:    Zenoah
   
Engine Size Cubic Centimeters:    62
   
Engine Size Cubic Inches:    3.78
Dry Weight:    14.9
   
Bar Oiler Type:    Automatic
   
Bar Length:    20
G621AVS   1998   $675.00   
Engine Make:    Zenoah
   
Engine Size Cubic Centimeters:    62
   
Engine Size Cubic Inches:    3.78
Dry Weight:    14.9
   
Bar Oiler Type:    Automatic
   
Bar Length:    24
G621AVS   1997   $660.00   
Engine Make:    Zenoah
   
Engine Size Cubic Centimeters:    62
   
Engine Size Cubic Inches:    3.78
Dry Weight:    14.9
   
Bar Oiler Type:    Automatic
   
Bar Length:    16
G621AVS   1997   $665.00   
Engine Make:    Zenoah
   
Engine Size Cubic Centimeters:    62
   
Engine Size Cubic Inches:    3.78
Dry Weight:    14.9
   
Bar Oiler Type:    Automatic
   
Bar Length:    18
G621AVS   1997   $670.00   
Engine Make:    Zenoah
   
Engine Size Cubic Centimeters:    62
   
Engine Size Cubic Inches:    3.78
Dry Weight:    14.9
   
Bar Oiler Type:    Automatic
   
Bar Length:    20
G621AVS   1997   $675.00   
Engine Make:    Zenoah
   
Engine Size Cubic Centimeters:    62
   
Engine Size Cubic Inches:    3.78
Dry Weight:    14.9
   
Bar Oiler Type:    Automatic
   
Bar Length:    24
G621AVS   1996   $660.00   
Engine Make:    Zenoah
   
Engine Size Cubic Centimeters:    62
   
Engine Size Cubic Inches:    3.78
Dry Weight:    14.9
   
Bar Oiler Type:    Automatic
   
Bar Length:    16
G621AVS   1996   $665.00   
Engine Make:    Zenoah
   
Engine Size Cubic Centimeters:    62
   
Engine Size Cubic Inches:    3.78
Dry Weight:    14.9
   
Bar Oiler Type:    Automatic
   
Bar Length:    18
G621AVS   1996   $670.00   
Engine Make:    Zenoah
   
Engine Size Cubic Centimeters:    62
   
Engine Size Cubic Inches:    3.78
Dry Weight:    14.9
   
Bar Oiler Type:    Automatic
   
Bar Length:    20
G621AVS   1996   $675.00   
Engine Make:    Zenoah
   
Engine Size Cubic Centimeters:    62
   
Engine Size Cubic Inches:    3.78
Dry Weight:    14.9
   
Bar Oiler Type:    Automatic
   
Bar Length:    24
G621AVS   1992   $560.00   
Engine Make:    Komatsu
   
Engine Size Cubic Centimeters:    62
   
Engine Size Cubic Inches:    3.78
Dry Weight:    11.9
   
Bar Oiler Type:    Automatic
   
Bar Length:    16
G621AVS   1992   $565.00   
Engine Make:    Komatsu
   
Engine Size Cubic Centimeters:    62
   
Engine Size Cubic Inches:    3.78
Dry Weight:    11.9
   
Bar Oiler Type:    Automatic
   
Bar Length:    18
G621AVS   1992   $570.00   
Engine Make:    Komatsu
   
Engine Size Cubic Centimeters:    62
   
Engine Size Cubic Inches:    3.78
Dry Weight:    11.9
   
Bar Oiler Type:    Automatic
   
Bar Length:    20
G621AVS   1992   $575.00   
Engine Make:    Komatsu
   
Engine Size Cubic Centimeters:    62
   
Engine Size Cubic Inches:    3.78
Dry Weight:    11.9
   
Bar Oiler Type:    Automatic
   
Bar Length:    24
G621AVS   1991   $545.00   
Engine Make:    Komatsu
   
Engine Size Cubic Centimeters:    62
   
Engine Size Cubic Inches:    3.78
Dry Weight:    11.9
   
Bar Oiler Type:    Automatic
   
Bar Length:    16
G621AVS   1991   $550.00   
Engine Make:    Komatsu
   
Engine Size Cubic Centimeters:    62
   
Engine Size Cubic Inches:    3.78
Dry Weight:    11.9
   
Bar Oiler Type:    Automatic
   
Bar Length:    18
G621AVS   1991   $555.00   
Engine Make:    Komatsu
   
Engine Size Cubic Centimeters:    62
   
Engine Size Cubic Inches:    3.78
Dry Weight:    11.9
   
Bar Oiler Type:    Automatic
   
Bar Length:    20
G621AVS   1991   $560.00   
Engine Make:    Komatsu
   
Engine Size Cubic Centimeters:    62
   
Engine Size Cubic Inches:    3.78
Dry Weight:    11.9
   
Bar Oiler Type:    Automatic
   
Bar Length:    24
G621AVS   1990   $545.00   
Engine Make:    Komatsu
   
Engine Size Cubic Centimeters:    62
   
Engine Size Cubic Inches:    3.78
Dry Weight:    11.9
   
Bar Oiler Type:    Automatic
   
Bar Length:    16
G621AVS   1990   $550.00   
Engine Make:    Komatsu
   
Engine Size Cubic Centimeters:    62
   
Engine Size Cubic Inches:    3.78
Dry Weight:    11.9
   
Bar Oiler Type:    Automatic
   
Bar Length:    18
G621AVS   1990   $555.00   
Engine Make:    Komatsu
   
Engine Size Cubic Centimeters:    62
   
Engine Size Cubic Inches:    3.78
Dry Weight:    11.9
   
Bar Oiler Type:    Automatic
   
Bar Length:    20
G621AVS   1990   $560.00   
Engine Make:    Komatsu
   
Engine Size Cubic Centimeters:    62
   
Engine Size Cubic Inches:    3.78
Dry Weight:    11.9
   
Bar Oiler Type:    Automatic
   
Bar Length:    24
G621AVS   1989   $505.00   
Engine Make:    Komatsu
   
Engine Size Cubic Centimeters:    62
   
Engine Size Cubic Inches:    3.78
Dry Weight:    12
   
Bar Oiler Type:    Automatic
   
Bar Length:    20
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