diff --git a/CommandLines.cpp b/CommandLines.cpp
index a71b022..6683c16 100644
--- a/CommandLines.cpp
+++ b/CommandLines.cpp
@@ -64,13 +64,13 @@ void init_opt(hifiasm_opt_t* asm_opt)
     asm_opt->pat_index = NULL;
     asm_opt->mat_index = NULL;
     asm_opt->thread_num = 1;
-    asm_opt->k_mer_length = 41;
-	asm_opt->mz_win = 41;
+    asm_opt->k_mer_length = 51;
+	asm_opt->mz_win = 51;
 	asm_opt->bf_shift = 37;
 	asm_opt->high_factor = 5.0f;
 	asm_opt->no_HPC = 0;
 	asm_opt->no_kmer_flt = 0;
-	asm_opt->max_n_chain = 1000;
+	asm_opt->max_n_chain = 400;
     asm_opt->k_mer_min_freq = 3;
     asm_opt->k_mer_max_freq = 66;
     asm_opt->load_index_from_disk = 1;
diff --git a/CommandLines.h b/CommandLines.h
index b820b35..0a7d6af 100644
--- a/CommandLines.h
+++ b/CommandLines.h
@@ -3,7 +3,7 @@
 
 #include <pthread.h>
 
-#define HA_VERSION "0.3.0-dirty-r190"
+#define HA_VERSION "0.3.0-dirty-r191"
 
 #define VERBOSE 0
 #define VERBOSE_GFA 0