Is it a gx 620 or 670

Tjpokey · 04-23-2013, 07:36 AM

Can any one shed some light on my problem. I found a fully rebuilt gx 620 for sale for a great price and promptly had a look at it and it looked like new and ran great so I took it home. Upon getting it home and giving it a close inspection I found the sticker on the plastic shroud to say 20 hp which to my knowledge would make it a gx620 but the little sticker on the side of the engine says it is a gx 670 24hp. Just wondering if there is a way of telling the two apart without stripping it down? Any input would be awesome thank you.

jeffrun · 04-23-2013, 08:22 PM

The output shaft diameter on a GX620 is 1" and on a GX670 is 1-1/8". Also under the starter motor ,etched on the block is a motor id# write down all info and provide to forum, we could find model then.

fstg21 · 04-23-2013, 09:57 PM

[QUOTE=jeffrun;872342]The output shaft diameter on a GX620 is 1" and on a GX670 is 1-1/8". Also under the starter motor ,etched on the block is a motor id# write down all info and provide to forum, we could find model then.[/QUOTE

They use the same block. Could be either. Crank will tell. 66mm Stroke on the 620 and 72mm stroke on the 670

Tjpokey · 04-24-2013, 06:19 AM

Well it must be a 670 then because it is a 1 1/8" shaft but I will try and find the id number and post it for interests sake.

Tjpokey · 04-26-2013, 12:32 AM

Alright guys I found the Id number it is GCAD-2066989. Thank heaps!

fstg21 · 04-26-2013, 10:24 AM

That's a GX620 number

Tjpokey · 04-26-2013, 08:06 PM

Well it must be a 620 with a 1 1/8 shaft thanks for the info

04-23-2013, 07:36 AM	#1
Tjpokey Not Yet Wild Join Date: Mar 2013 Location: Western Australia Posts: 16	Is it a gx 620 or 670 Can any one shed some light on my problem. I found a fully rebuilt gx 620 for sale for a great price and promptly had a look at it and it looked like new and ran great so I took it home. Upon getting it home and giving it a close inspection I found the sticker on the plastic shroud to say 20 hp which to my knowledge would make it a gx620 but the little sticker on the side of the engine says it is a gx 670 24hp. Just wondering if there is a way of telling the two apart without stripping it down? Any input would be awesome thank you.

04-23-2013, 08:22 PM	#2
jeffrun Gone Wild Join Date: Apr 2011 Location: Washington State Posts: 385	Re: Is it a gx 620 or 670 The output shaft diameter on a GX620 is 1" and on a GX670 is 1-1/8". Also under the starter motor ,etched on the block is a motor id# write down all info and provide to forum, we could find model then.

04-23-2013, 09:57 PM	#3
fstg21 Gone Wild Join Date: Sep 2011 Location: ARIZONA Posts: 476	Re: Is it a gx 620 or 670 [QUOTE=jeffrun;872342]The output shaft diameter on a GX620 is 1" and on a GX670 is 1-1/8". Also under the starter motor ,etched on the block is a motor id# write down all info and provide to forum, we could find model then.[/QUOTE They use the same block. Could be either. Crank will tell. 66mm Stroke on the 620 and 72mm stroke on the 670

04-24-2013, 06:19 AM	#4
Tjpokey Not Yet Wild Join Date: Mar 2013 Location: Western Australia Posts: 16	Re: Is it a gx 620 or 670 Well it must be a 670 then because it is a 1 1/8" shaft but I will try and find the id number and post it for interests sake.

04-26-2013, 12:32 AM	#5
Tjpokey Not Yet Wild Join Date: Mar 2013 Location: Western Australia Posts: 16	Re: Is it a gx 620 or 670 Alright guys I found the Id number it is GCAD-2066989. Thank heaps!

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04-26-2013, 10:24 AM	#6
fstg21 Gone Wild Join Date: Sep 2011 Location: ARIZONA Posts: 476	Re: Is it a gx 620 or 670 That's a GX620 number

04-26-2013, 08:06 PM	#7
Tjpokey Not Yet Wild Join Date: Mar 2013 Location: Western Australia Posts: 16	Re: Is it a gx 620 or 670 Well it must be a 620 with a 1 1/8 shaft thanks for the info