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Unread 05-19-2019, 06:34 AM   #31
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Default Re: G1 big bore kits??

It has been quite awhile since I have examined any 2-cycle barrels and pistons. That is quite a design departure from what I am familiar with. Technology moves forward I suppose.
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Unread 05-20-2019, 03:09 PM   #32
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Default Re: G1 big bore kits??

Did you measure the top of the pin to the top of the piston? It looks different from your stock one. That would change the stroke


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Unread 05-20-2019, 04:13 PM   #33
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Default Re: G1 big bore kits??

Quote:
Originally Posted by SKETSKI View Post
Did you measure the top of the pin to the top of the piston? It looks different from your stock one. That would change the stroke


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nope havent done that but I will.
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Unread 05-20-2019, 05:44 PM   #34
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Default Re: G1 big bore kits??

Quote:
Originally Posted by SKETSKI View Post
Did you measure the top of the pin to the top of the piston? It looks different from your stock one. That would change the stroke


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It would change the compression ratio but not the stroke. Only by altering the crank throw do you change the stroke.
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Unread 05-26-2019, 04:50 PM   #35
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Default Re: G1 big bore kits??

Quote:
Originally Posted by SKETSKI View Post
Did you measure the top of the pin to the top of the piston? It looks different from your stock one. That would change the stroke


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This measurement looks the same on both pistons
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Unread 05-26-2019, 04:54 PM   #36
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Default Re: G1 big bore kits??

Bottom end freshened up and the "kit has been installed". Electrical installed and clutch on. Its sitting in the chassis just gotta finish it up. Maybe test runs Tomorrow.
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Unread 05-26-2019, 04:58 PM   #37
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Default Re: G1 big bore kits??

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Originally Posted by slonomo View Post
I'm definitely not a 2 stroke expert, but this doesn't look anything like the stock setup. Obviously the ports on the jug must be different as well. I'd like to see the inside of the cylinder comparison as well. Anxious to see how this works out.
First 2 pics are my old j10 cylinder. Second is the big bore kit.ports seemed to have been cleaned up but nothing crazy.

A video showing the piston in the bore intake side
https://m.facebook.com/groups/482699...36028&sfnsn=cl
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Unread 05-27-2019, 09:49 AM   #38
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Default Re: G1 big bore kits??

Anxious to see the results. Looks like a decent quality cylinder. I'm still puzzled at the lack of ports on the pistons, but I'm not a two stroke guy.
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Unread 05-27-2019, 01:43 PM   #39
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Default Re: G1 big bore kits??

It runs really well. I'm still only getting like 22 mph but you can feel it in the bottom end. I think I need to do some adjusting on the throttle cable as I broke the shaft coming out of the differential and now have the cable hooked directly to the carb. I still need to pull the plug a d see how well its burning. When I get caught up I think I'll call plowmans and get a muffler maybe see what he would reccomend jet wise.

Still some testing to do. It's going to be slow this week as I have some testing at work later this week and I need to study.
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Unread 05-28-2019, 06:39 PM   #40
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Default Re: G1 big bore kits??

Compression shows around 120 and this is my plug reading. Not white but not tan colored either. Looks greyish. Any pointers
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