Lin, a six-time Asian Tour winner, is clearly the man to catch when play resumes on Saturday morning as he marked his card with nine birdies against one lone bogey to take his place atop the leaderboard with his two-day total of 10-under-par 134.
Inclement weather brought a halt to the day's action at 5pm (local time) and 19 players will now have to return to Royale Jakarta Golf Club to resume their round at 6.45pm (local time) tomorrow.
Australian rookie Cameron Smith continued to impress in what is only his second start on the Asian Tour by carding a 67 to trail Lin by one while a grieving Nicholas Fung of Malaysia held back his emotions and battled to a 69 to share third place with Thailand's Chapchai Nirat.
Lin was forced to withdraw from an event in Malaysia last week because of heat and fatigue.
But having taken a well-rested break, the 40-year-old came out with all guns blazing in the morning.
"I wasn't feeling very well coming to this week. I had to withdraw from the tournament in Malaysia last week because the weather was just too hot! I spent two days resting in the hotel. I have never slept so much before it was quite scary. I guess my body really needed some rest," said Lin.
After missing the cut in his debut event in the Philippines in March, Smith is relishing the prospect of playing in the weekend rounds at the CIMB Niaga Indonesian Masters.
The Asian Tour graduate, who finished tied-18th in Qualifying School earlier this year, traded eight birdies against three bogeys to put himself into contention for his maiden win.
"Today was a better start for me as I got the ball rolling pretty quickly early. I got a couple of bogeys which was disappointing but hopefully I can wipe them off the cards over the weekend," said Smith.
"My life has changed a little bit since I turned professional. There's a little bit more travel, more work into golf which is nice but overall it's not a bad job that I have," added the Australian.
Despite carrying a heavy heart with the passing of his grandmother, Fung continued his chase for his career breakthrough on the region's premier Tour.
The Malaysian, who started on the front-nine, simply could not find those decisive birdie putts as he made 11 straight pars.
"I think I lost focus in my front nine. Then my caddy told me to put aside the unhappiness of my grandma's passing and concentrate on my game," said Fung.
"Scores after round 2 of the CIMB NIAGA Indonesian Masters being played at the par 72, 7340 Yards Royale Jakarta GC course (a- denotes amateur):"
134 - LIN Wen-tang (TPE) 70-64.
135 - Cameron SMITH (AUS) 68-67.
"136 - Chapchai NIRAT (THA) 68-68, Nicholas FUNG (MAS) 67-69."
137 - S.S.P CHOWRASIA (IND) 71-66.
"138 - Jazz JANEWATTANANOND (THA) 68-70, Chan KIM (USA) 69-69."
"139 - Arnond VONGVANIJ (THA) 70-69, Bernd WIESBERGER (AUT) 68-71, Anirban LAHIRI (IND) 70-69, Adilson DA SILVA (BRA) 69-70, Gunn CHAROENKUL (THA) 70-69, BAEK Seuk-hyun (KOR) 71-68, Marcus BOTH (AUS) 69-70."
"140 - Rashid KHAN (IND) 70-70, LAM Chih Bing (SIN) 72-68, Jake HIGGINBOTTOM (AUS) 68-72, Rahil GANGJEE (IND) 70-70, Jyoti RANDHAWA (IND) 72-68, Kiradech APHIBARNRAT (THA) 71-69, Louis OOSTHUIZEN (RSA) 72-68."
"141 - HUNG Chien-yao (TPE) 72-69, Sam CYR (USA) 72-69, Matthew STIEGER (AUS) 73-68, George GANDRANATA (INA) 71-70, Thaworn WIRATCHANT (THA) 71-70, Elias BERTHEUSSEN (NOR) 71-70, Berry HENSON (USA) 70-71."
"142 - Jason KNUTZON (USA) 70-72, KIM Gi-whan (KOR) 71-71, Sujjan SINGH (IND) 68-74, Adam GROOM (AUS) 73-69, WANG Jeung-hun (KOR) 69-73."