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Engine basics => Engine set up tips => Topic started by: frank mccune on June 17, 2017, 08:31:22 AM

Title: ST .49 vs. ST .51 parts interchangeability? These are the new square head ones.
Post by: frank mccune on June 17, 2017, 08:31:22 AM

      Hello All:

      Will the parts for the .51 drop into a .49 like the p&c to get a .49 running again?

      I have a .49 that is a bit tired and my fiend has a .51 that is a great running engine.  Perhaps a Brian Gardner .51 p&c will bring my .49 back to life.

     In the past, I have seen engines that were different sizes that had the piston, sleeve, and head changed to go from .15 to .23 and the OS .30 to .35 used the same crankcase for both sizes with a few different parts.  Perhaps the ST .49 would not need much to increase the size to a .51.

   Any thoughts or comments concerning this swap?

                                                                                                                    Tia,

                                                                                                                    Frank McCune

Title: Re: ST .49 vs. ST .51 parts interchangeability? These are the new square head ones.
Post by: RandySmith on June 18, 2017, 09:45:08 AM

Quote from: frank mccune on June 17, 2017, 08:31:22 AM

      Hello All:

      Will the parts for the .51 drop into a .49 like the p&c to get a .49 running again?

      I have a .49 that is a bit tired and my fiend has a .51 that is a great running engine.  Perhaps a Brian Gardner .51 p&c will bring my .49 back to life.

     In the past, I have seen engines that were different sizes that had the piston, sleeve, and head changed to go from .15 to .23 and the OS .30 to .35 used the same crankcase for both sizes with a few different parts.  Perhaps the ST .49 would not need much to increase the size to a .51.

   Any thoughts or comments concerning this swap?

                                                                                                                    Tia,

                                                                                                                    Frank McCune

You would  maybe need to measure the parts, and have the  two in your hands to see  if they would fit, If you like , and you have no 51 parts,  send the 49 to me and  I will  check it for you, I have all the parts for 51s here, including  the ABC P/S

Randy

Title: Re: ST .49 vs. ST .51 parts interchangeability? These are the new square head ones.
Post by: RandySmith on June 29, 2017, 10:40:57 AM

Hi frank  you  should  let us  know  what  you find  about  the  motor, and its  interchangeability with the  51
randy