Since I had accidentally pinched the inner tube on my DRZ while self-installing tires for the first time, I thought I’d use the opportunity to attempt a patch repair. Good to pick up a useful skill during this Covid Circuit Breaker season.
1. First, look for the puncture site. 2. Then scuff it up with a rasp file or some sandpaper. 3. Apply a generous coat of rubber cement / vulcanising paste. 4. Wait for at least 5mins to allow the rubber cement to dry. 5. Peel off the aluminium foil backing of the patch and apply patch onto puncture site. 6. Stitch the patch by rolling some blunt tool over it. 7. The patched tube is now ready for use!
Since I had to stay home due to the Covid-19 circuit breaker measures in place, and that I couldn’t ride, I decided to do a little bit of bike maintenance. I’ve not replaced the brake fluids on my G650GS Sertao since I purchased it about a year ago. And now with the DRZ in my stable, I thought I’d take the time to get the brake fluids replaced.
Since it was easier on the DRZ as there’s no ABS pump to deal with, I started with the Zee. Connected the bleeder valve kit to the brake bleed valve and started pumping away.
At (just) 2 years and 7 months, the battery on my R1200GS died. Yup, the dealer had warned me when I sent the bike in for valve clearance adjustments and general servicing last month that the battery wasn’t in good condition. It was tested to have only 174CCA when it should be around the 200CCA mark. In fact, the battery manufacturer claims to be able to output up to 290CCA on this model – so that’s some seriously deteriorated life.
While 2 years and 7 months may initially seem like a respectable age for a motorcycle battery to last, I was disappointed.
I was on my way to office on morning, merrily rolling along the usual morning traffic when I suddenly felt my rear wheel disengaged from the motor. Blipping the throttle only produced a cringe-worthy rattle with no power transfer to the wheel. And so I pulled to the side of the road and called BMW Assist.
My Sertao is 6.5yrs old and have seen almost 60,000km. I don’t think the fork oil has ever been replaced. Not only the front suspension is beginning to feel like a pogo stick – bouncing around during brake dives, but my left fork has started developing a leak.
In fact, when it first started weeping, I didn’t even realise it. So much that fork oil dripped down the fork and ended up on the brakes, causing the brakes to squeal and the calliper to bind slightly. Not cool!
Immediately after a recent ride through the dirt trails of Ulu Choh, the G650GS started developing a horrible squeal in the front wheel area. This happens even while riding – and is especially notable at lower speeds. My initial fear was that the wheel hub bearing had gone bad. I have been taking the Sertao on some treacherous off-roading trips of late.
Like a resilient little pig that just refuse to die, the squeal was present when spinning the wheel while the bike is on the main stand. If it was the wheel bearings, that would have been not too good news – I’ve never done a bearing replacement before and probably don’t have the correct tools for extraction and, more importantly, proper re-insertion. But out of curiosity, I removed the brake calipers just to assess the damage – spun the wheel, and…. the squeal was gone!
Now that I have ascertained that it was the brakes, but not the bearings that caused the squeal, it was time for some brake caliper servicing!
At 67,000km, my BMW R1200GS clutch switch failed. Symptoms include 1) not being able to start the bike while in gear and 2) not being able to switch riding modes while the bike is in motion.
You see, for either of the above 2 to work, the ECU must know that the clutch lever is FULLY pulled in. The R1200GS that comes with cruise control and/or shift assist pro use a set of dual microswitch instead of the typical single microswitch. The first part of the switch senses that the clutch lever is being slightly pulled in, and the second part senses if the clutch lever is fully pulled in.
My little GS needs new shoes. The Metzler Tourance Next tires that came with the bike was almost bald. And since I got this bike primarily to take on the trails and fire roads, I decided to get some 50-50 off-road biased tires too!
After some research, and at the recommendation from a friend, I decided to go for the Shinko 804 (front) and 805 (rear) tires. The set cost just below $200 – which I thought was excellent value for tires!
The BMW maintenance schedule calls for a brake fluid replacement every 2 years on the BMW R1200GS wethead. The last brake fluid replacement on my GS was in Dec16. And since I was planning for a long’ish trip later this year, I thought it was a good idea to get this done earlier.
The front brakes were a little easier for a one-man bleed operation – I could reach for the brake lever and the bleed screw simultaneously, applying pressure on the brake lever while I released the bleed screw for the brake fluid to eject. But the rear wasn’t as simple – the rear brake pedal was on the right hand side of the bike, while the brake caliper (and thus the bleed screw) was on the left. If I were to attempt to do it without an assistant, I’ll need to create some negative pressure for suction – that’s where the brake bleeding pump kit comes in handy!
Sintered (metal-infused) brake pads generally provide awesome braking power and have great brake life. But the biggest drawback is that it tends to squeal. Shortly after replacing my set of front Brembo pads on my BMW R1200GS LC, my brakes started squealing like a pig being sent to the slaughterhouse every time just before the bike comes to a complete halt. This typically happens when the brakes are cold, and sometimes (only sometimes), it goes away after warming up the pads. And since I’ve got a self-admitted OCD for these kind of things, I decided to do something about it.