diff --git a/tests/core_tests/chaingen.cpp b/tests/core_tests/chaingen.cpp
index ddeef09d..41c149bc 100644
--- a/tests/core_tests/chaingen.cpp
+++ b/tests/core_tests/chaingen.cpp
@@ -49,7 +49,6 @@ const crypto::signature invalid_signature = create_invalid_signature();
 
 test_generator::test_generator()
   : m_wallet_test_core_proxy(new wallet_test_core_proxy())
-  , m_do_pos_to_low_timestamp(false)
   , m_ignore_last_pow_in_wallets(false)
   , m_last_found_timestamp(0)
 {
@@ -533,8 +532,6 @@ bool test_generator::find_kernel(const std::list<currency::account_base>& accs,
   {
     starter_timestamp -= 90;
   }
-  if (m_do_pos_to_low_timestamp)
-    starter_timestamp += 60;
 
   //adjust timestamp starting from timestamp%POS_SCAN_STEP = 0
   //starter_timestamp = starter_timestamp - POS_SCAN_WINDOW;
@@ -570,18 +567,6 @@ bool test_generator::find_kernel(const std::list<currency::account_base>& accs,
           continue;
         else
         {
-          if (m_do_pos_to_low_timestamp)
-          {
-            if (!m_last_found_timestamp)
-            {
-              m_last_found_timestamp = ts;
-              continue;
-            }
-
-            if(m_last_found_timestamp >= ts)
-              continue;
-          }
-
           //found kernel
           LOG_PRINT_GREEN("Found kernel: amount=" << print_money(pos_entries[i].amount)
             << ", index=" << pos_entries[i].g_index
diff --git a/tests/core_tests/chaingen.h b/tests/core_tests/chaingen.h
index 88019806..b7f4e97d 100644
--- a/tests/core_tests/chaingen.h
+++ b/tests/core_tests/chaingen.h
@@ -525,7 +525,6 @@ public:
   static const test_gentime_settings& get_test_gentime_settings() { return m_test_gentime_settings; }
   static void set_test_gentime_settings(const test_gentime_settings& s) { m_test_gentime_settings = s; }
   static void set_test_gentime_settings_default() { m_test_gentime_settings = m_test_gentime_settings_default; }
-  void set_pos_to_low_timestamp(bool do_pos_to_low_timestamp) { m_do_pos_to_low_timestamp = do_pos_to_low_timestamp; }
   void set_ignore_last_pow_in_wallets(bool ignore_last_pow_in_wallets) { m_ignore_last_pow_in_wallets = ignore_last_pow_in_wallets; }
   void set_hardfork_height(size_t hardfork_id, uint64_t h);
   void set_hardforks(const currency::hard_forks_descriptor& hardforks);
@@ -533,7 +532,6 @@ public:
 
 
 private:
-  bool m_do_pos_to_low_timestamp;
   bool m_ignore_last_pow_in_wallets;
   uint64_t m_last_found_timestamp;
   
diff --git a/tests/core_tests/chaingen_main.cpp b/tests/core_tests/chaingen_main.cpp
index fb1dc8e8..90fe3ff4 100644
--- a/tests/core_tests/chaingen_main.cpp
+++ b/tests/core_tests/chaingen_main.cpp
@@ -251,7 +251,7 @@ bool gen_and_play_intermitted_by_blockchain_saveload(const char* const genclass_
 
 
 #define GENERATE_AND_PLAY(genclass)                                                                        \
-  if((!postponed_tests.count(#genclass) && run_single_test.empty()) || std::string::npos != std::string(#genclass).find(run_single_test)) \
+  if((!postponed_tests.count(#genclass) && run_single_test.empty()) || (!run_single_test.empty() && std::string::npos != std::string(#genclass).find(run_single_test)) \
   {                                                                                                        \
     TIME_MEASURE_START_MS(t);                                                                              \
     ++tests_count;                                                                                         \
diff --git a/tests/core_tests/hard_fork_1_bad_pos_source.cpp b/tests/core_tests/hard_fork_1_bad_pos_source.cpp
index b60a1d08..3c79512c 100644
--- a/tests/core_tests/hard_fork_1_bad_pos_source.cpp
+++ b/tests/core_tests/hard_fork_1_bad_pos_source.cpp
@@ -37,7 +37,6 @@ bool hard_fork_1_bad_pos_source::generate(std::vector<test_event_entry>& events)
 
   DO_CALLBACK(events, "configure_core");
   REWIND_BLOCKS_N_WITH_TIME(events, blk_0r, blk_0, miner_acc, CURRENCY_MINED_MONEY_UNLOCK_WINDOW + 5);
-  generator.set_pos_to_low_timestamp(true);
   MAKE_TX(events, tx_1, miner_acc, pos_miner_acc_before_pow, 1000000000000, blk_0r);
   MAKE_NEXT_BLOCK_TX1(events, blk_pow_tx1, blk_0r, miner_acc, tx_1);
   MAKE_TX(events, tx_2, preminer_acc, pos_miner_acc_after_pow, 1000000000000, blk_pow_tx1);
diff --git a/tests/core_tests/hard_fork_1_consensus_test.cpp b/tests/core_tests/hard_fork_1_consensus_test.cpp
index 09753840..dd672019 100644
--- a/tests/core_tests/hard_fork_1_consensus_test.cpp
+++ b/tests/core_tests/hard_fork_1_consensus_test.cpp
@@ -43,7 +43,6 @@ bool hard_fork_1_cumulative_difficulty_base::generate(std::vector<test_event_ent
     last_block = next_blk_pow;
   }
 
-  generator.set_pos_to_low_timestamp(true);
   last_block = blk_0r; 
   for (size_t i = 0; i != 20; i++)
   {