Help! Questions about boring for more displacement...

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  • gs1000racer
    #1

    Help! Questions about boring for more displacement...

    Hi everyone,

    I want to go for some serious displacement on my Kat 1100, and found some JE pistons that would push it so 1500 cc's. What else is needed for this mod beyond having the block bored out (If even possible)?

    Please help as this is totally new territory to me.

    Thanks,
    Last edited by Guest; 02-16-2012, 04:35 PM.
    Tags: None
    • John Kat
      Forum Sage
      • Oct 2010
      • 1433
      • France
      #2
      I believe APE racing has some answers for you....
      GS Zone
      http://gszone.biz/
      sigpicJohn Kat
      My bikes: CB 77, GS 1000 ST Cafe Racer with GSXR 1052 engine, GS 1000 ST, XR 41 Replica with GS 1085 engine,
      GS 1100 SZ Katana with GS 1135 EFF engine, KTM Superduke 1290 R 2020

        Comment

        • steve murdoch
          Forum Guru
          Past Site Supporter
          • May 2004
          • 8489
          • St. Catharines, On.
          #3
          After reading that article, contact RapidRay.
          I think 1500 is too big for a road racer.
          2@ \'78 GS1000

            Comment

            • Guest
              #4
              What is the bike going to be used for?

                Comment

                • ozman
                  #5
                  Originally posted by gs1000racer
                  Hi everyone,

                  I want to go for some serious displacement on my Kat 1100, and found some JE pistons that would push it so 1500 cc's. What else is needed for this mod beyond having the head bored out?

                  Please help as this is totally new territory to me.

                  Thanks,
                  you would need a big block std block wont sleeve to 1500 and bore cases to suit

                    Comment

                    • rapidray
                      Forum Guru
                      GSResource Superstar
                      • Oct 2006
                      • 8195
                      • So Cal
                      #6
                      I have blocks & 1500 will make a LOT of torque!!! You need a LARGE oil cooler too. Would make a fun motor! Ray.

                        Comment

                        • gs1000racer
                          #7
                          Can you get away with a stock top and bottom end when running a big block with those kind of pistons?

                          Originally posted by rapidray
                          I have blocks & 1500 will make a LOT of torque!!! You need a LARGE oil cooler too. Would make a fun motor! Ray.

                            Comment

                            • Guest
                              #8
                              Originally posted by gs1000racer
                              Can you get away with a stock top and bottom end when running a big block with those kind of pistons?
                              No, a stock bottom end will not be adequate.

                              To start I would do the following:
                              Welded crank with straight cut gears.
                              Clutch basket with HD backing plate and straight cut gear to match crank
                              HD trans shaft bearings

                              I am sure someone will chime in with more

                                Comment

                                • gearhead13
                                  #9
                                  Yes, and lots of work and money on the starting/charging system to turn over those big 'ol pistons. They are probably high compression, so count on running booster or race gas.

                                    Comment

                                    • rapidray
                                      Forum Guru
                                      GSResource Superstar
                                      • Oct 2006
                                      • 8195
                                      • So Cal
                                      #10
                                      Call me at 714--356-7845. I build LOTS of big motors & it doesn't require as much as some here are making it sound. Ray.

                                        Comment

                                        • Guest
                                          #11
                                          Originally posted by rapidray
                                          Call me at 714--356-7845. I build LOTS of big motors & it doesn't require as much as some here are making it sound. Ray.

                                          Come on Ray .....spill the beans I have the same dilemma

                                          85 1150 wanting to go 15, mostly street with the occasional track appearance

                                          Also want to knock the occasional Busa upside the head...

                                            Comment

                                            • rapidray
                                              Forum Guru
                                              GSResource Superstar
                                              • Oct 2006
                                              • 8195
                                              • So Cal
                                              #12
                                              Again, CALL me! Ray.

                                                Comment

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