diff --git a/src/k_kart.c b/src/k_kart.c
index 6b7a7a0e..ac86db0a 100644
--- a/src/k_kart.c
+++ b/src/k_kart.c
@@ -3259,7 +3259,7 @@ static mobj_t *K_ThrowKartItem(player_t *player, boolean missile, mobjtype_t map
 				angle_t fa = player->mo->angle>>ANGLETOFINESHIFT;
 				fixed_t HEIGHT = (20 + (dir*10))*mapobjectscale + (player->mo->momz*P_MobjFlip(player->mo));
 
-				P_SetObjectMomZ(mo, HEIGHT, false);
+				mo->momz = HEIGHT*P_MobjFlip(mo);
 				mo->momx = player->mo->momx + FixedMul(FINECOSINE(fa), PROJSPEED*dir);
 				mo->momy = player->mo->momy + FixedMul(FINESINE(fa), PROJSPEED*dir);
 
@@ -6036,7 +6036,7 @@ void K_MoveKartPlayer(player_t *player, boolean onground)
 	if (leveltime < starttime+10)
 	{
 		player->mo->scalespeed = mapobjectscale/12;
-		player->mo->destscale = mapobjectscale + (player->kartstuff[k_boostcharge]*131);
+		player->mo->destscale = mapobjectscale + (FixedMul(mapobjectscale, player->kartstuff[k_boostcharge]*131));
 		if (cv_kartdebugshrink.value && !modeattacking && !player->bot)
 			player->mo->destscale = (6*player->mo->destscale)/8;
 	}