[aargee]

Originally Posted by BullettuPaandi

a larger hole is needed to fit the tool that pushes the mushroom plug in, whose stem is inevitably smaller than the tool (the outer diameter of the gun's barrel in your case), and that the plugs are too smooth to adhere to the tyre (he claims that they're coated with lubricant), make the mushroom plugs useless

Very good post. Thank you for sharing the video. I too contemplate that this is exactly the problem why the mushroom kit didn't work.

[aargee]

Originally Posted by surjaonwheelz

Are the spark plugs original (that came with the bike)? Check if you want to change them.

Originally Posted by rajeevsulu

Anyways,as mentioned above,do get your spark plugs checked.

Dear Sirs: Riding in city with low to medium traffic for last 2 weeks now & have noticed a fuel bar disparate sooner than expected which is similar to my spirited highway rides. This makes me suspect a faulty O2 sensor at header pipe. This is a similar issue I faced with my CBR.

If it were the spark plug, the FE decline would likely be gradual rather than abrupt isn't it? Also, the 20 Kmpl FE should show some variation between highway and city rides isn't it?

I agree that replacing O2 sensors is costly affair {perhaps warranty?} & a more practical approach would be to first try replacing the spark plugs before considering the more expensive O2 sensor.

But first, appreciate your thoughts on the above. Tks.

[rajeevsulu]

I am not sure but the engine check light would come on if there is an issue with the oxygen sensor, would it not?

Cheers

[aargee]

Originally Posted by rajeevsulu

I am not sure but the engine check light would come on if there is an issue with the oxygen sensor, would it not?

Yes, Sir. The engine light was glowing while I was riding from Hyderabad to Chennai. I first noticed it after Ongole but unsure when it had started glowing. It remained on until I crossed Nellore, but it's no longer glowing now.

[rajeevsulu]

I think your oxygen sensor is the issue. Do get it checked . The spark plugs may not be the issue but you can take a look. All should be good.

Cheers

[surjaonwheelz]

Originally Posted by aargee

But first, appreciate your thoughts on the above. Tks.

Are you experiencing any hesitation in acceleration? RPM fluctuations at idle? You should be able to rev linearly till 6-6.5k rpm without any stutter-putter.

At around 20k kms I did the following:
- Throttle body cleaning, as I'm using Motowings filter without the air filter cover, this made sense.
- Changed the spark plugs to iridium ones, just for longer life of the plugs.

I don't measure fuel efficiency but it's much lower in city commutes, where the first 3 gears are enough for the bike. I get anywhere between 180 to 200 kms range. I fill-up when ever the last bar starts blinking or sometimes at the last bar. I could never fill more than 10 litres, it's always in single digits.
On the highway, I get 220+ kms. Maximum I've stretched till 250 kms but anxiety kicks in so I refuel at 220-240kms trip at whatever fuel level it shows. One trip meter is reset at every refill, just too lazy to calculate the efficiency. With my Classic 350, I also diligently used the FuelIO app!

That's my normal use-case nothing special. But I would suggest you get the above done. Scan your bike for ECU error logs. In addition, check if valve clearance check is required.

Happy riding,
surjaonwheelz

[aargee]

Originally Posted by surjaonwheelz

Are you experiencing any hesitation in acceleration? RPM fluctuations at idle? You should be able to rev linearly till 6-6.5k rpm without any stutter-putter

No, I'm able to rev even until 7.5K at which rev limiter kicks in; I've tested this up to 3-4 gears in recent times & long back at 6th gear, which is immaterial now.

Originally Posted by surjaonwheelz

That's my normal use-case nothing special. But I would suggest you get the above done. Scan your bike for ECU error logs. In addition, check if valve clearance check is required.

I'll do as you said, but for SURE I need valve clearance, but the ASC keeps me pushing saying it's good for now. In a way, I'll have to accept because, the moment they open the engine head cover, the bike will no longer be the same as ASC is notorious for not putting every single bush, washer & even bolt nuts back due to which the wear & tear will be even more. Since I've Stanley's feeler gauge, I'm thinking of getting it done by myself. Only apprehension being tricky FI underneath the fuel tank.

[aargee]

Without having to do anything, this is the data captured for now. What should I say...reliable or unreliable RE?

[aargee]

This is how things unfolded:
08-Mar: Partially filled fuel as I planned for a visit to ASC to adjust the tappets

12-Mar: Took the bike to ASC, asked them to
1. Tighten front brakes
2. Adjust tappets
3. Fix mileage issue
Since ASC knew how I maintain my motorcycle, they didn't give me the usual advice of how I should be riding & what mistakes I might be making etc.

14-Mar: Took the bike back in a little unclean state & they had done only #2 & said they couldn't find any error or error history reading the OBD. They asked me to reset the ECU, if I found a low FE going forward. They also recommended a quicker method to test by riding for a short distance & filling up instead of waiting for entire tank to dry

16-Mar: With summer approaching fast, the wind was still cool in the morning, so Wife & I rode for a short 90 odd Km for a breakfast & filled to brim to get the highest FE ever obtained {second being 29.07 on 10-Dec-2021}. 78% of the ride was on ring road with a strict manual cruising at 100 Kmph & only once I shot to 150 for no more than 3-4 seconds.

It's totally baffling as what caused poor FE & more puzzling what fixed it!!

[sab3r2th]

Originally Posted by aargee

Dear Sirs: Riding in city with low to medium traffic for last 2 weeks now & have noticed a fuel bar disparate sooner than expected which is similar to my spirited highway rides. This makes me suspect a faulty O2 sensor at header pipe. This is a similar issue I faced with my CBR.

If it were the spark plug, the FE decline would likely be gradual rather than abrupt isn't it? Also, the 20 Kmpl FE should show some variation between highway and city rides isn't it?

I agree that replacing O2 sensors is costly affair {perhaps warranty?} & a more practical approach would be to first try replacing the spark plugs before considering the more expensive O2 sensor.

But first, appreciate your thoughts on the above. Tks.

As has been said multiple times, the fuel gauge is pretty useless and unreliable.

A faulty O2 sensor throws up a check engine light that stays there until you get it cleared. If something is indeed wrong with the sensor, it will come back on when started again. A new sensor costs about Rs 4k. The error code is the same for both the LH and RH sensors, and it is a hassle to verify which one is bad by getting one new sensor and then swapping it around. It is just easier to replace both.

It must be noted that one bad O2 sensor will not affect the ride or fuel consumption in any noticeable way, and you would not even be able to tell that something is wrong were it not for the CEL.