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Has anyone every bored out the cylinder and used oversized rings?
Discussion at Motorized Bicycle Engine Kit Forum in the High Performance Bicycle Engine Tips forum. Anyone done this to one of our two strokes?...  | | 
09-23-2009, 02:59 AM
|  | Motorized Bicycle Member | | Join Date: Aug 2008
Posts: 38
| |  Has anyone every bored out the cylinder and used oversized rings?
Anyone done this to one of our two strokes? |
09-23-2009, 03:54 AM
| | Motorized Bicycle Member | | Join Date: Aug 2008
Posts: 38
| | Re: Has anyone every bored out the cylinder and used oversized rings?
And yes, I know to do so is foolish.  |
09-23-2009, 09:30 AM
|  | Motorized Bicycle Elite Member | | Join Date: May 2008 Location: Fountain Hills, Arizona
Posts: 890
| | Re: Has anyone every bored out the cylinder and used oversized rings?
most 2 stroke engines have a thin nikasil plating on the cylinder wall...not much you can bore there 
some of the new grubees have a steel cylinder liner,,,a much better prospect for boring  |
09-23-2009, 10:05 AM
|  | Godfather of Motorized Bicycles | | Join Date: Jan 2008 Location: Ashtabula county, Ohio
Posts: 7,123
| | Re: Has anyone every bored out the cylinder and used oversized rings?
These engines are not bore-able, except as azbill mentioned some of the 50cc engines being sold have a steel liner....but then why not just buy a 70cc if you want a bigger engine?
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If it ain't broke, and you mess with it long enough, it will be. |
09-24-2009, 07:11 PM
| | Motorized Bicycle Elite Member | | Join Date: Jun 2009 Location: ny,ny
Posts: 597
| | Re: Has anyone every bored out the cylinder and used oversized rings?
Steel lined (I have one) or not, there is nothing to bore. Cylinders perform poorly when constructed of aluminum foil. |
09-24-2009, 07:29 PM
|  | Motorized Bicycle Elite Member | | Join Date: May 2009 Location: acme labs
Posts: 176
| | Re: Has anyone every bored out the cylinder and used oversized rings?
if you bored it over and reused the stock piston it would be to loose and probably get a lot of piston knock no mater what size rings you used. the bore must be sized for the piston, not the rings. the rings will be gaped so many .00's per inch of bore. |
09-28-2009, 01:38 AM
| | Motorized Bicycle Senior Member | | Join Date: Sep 2009 Location: Orlando
Posts: 75
| | Re: Has anyone every bored out the cylinder and used oversized rings?
If these cylinders are nikasil (which is ****in awesome) then you can bore your cylinder and send it off to be replated. Problem is then finding oversized pistons. |
09-28-2009, 08:44 AM
| | Motorized Bicycle Elite Member | | Join Date: Jun 2009 Location: ny,ny
Posts: 597
| | Re: Has anyone every bored out the cylinder and used oversized rings?
It appears those who are enthusiastic about re-boring never bothered to measure HT cyclinder wall thickness. |
09-28-2009, 09:51 AM
| | Motorized Bicycle Elite Member | | Join Date: May 2008 Location: Fountain Hills, Arizona
Posts: 890
| | Re: Has anyone every bored out the cylinder and used oversized rings?
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09-28-2009, 05:19 PM
| | Godfather of Motorized Bicycles | | Join Date: Jan 2008 Location: Ashtabula county, Ohio
Posts: 7,123
| | Re: Has anyone every bored out the cylinder and used oversized rings?
Fo'sho'...
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