Techno Queries

Is Fuel Injection To Blame?

At the very outset, congratulations to you all for the fabulous job you are doing!

I have a couple of queries regarding my trusted TVS Apache RTR Fi. The bike has done 15,400 km to date and I have always had it serviced from a reputed mechanic. Now-a-days, however, the bike becomes jerky as if it has run out of petrol, when it is actually not the case.

I took it to the best local mechanic in Kolkata to have the problem rectified. The bike seemed to be all right for some time, but the problem reared its head once again after a week or so. When I took it back to the mechanic, he insisted that it was a fuel injection problem and that there was nothing he could do. The power from the throttle is all right, but it seems as if the fuel does not reach the engine properly. Is it likely that there would be some kind of a block in the fuel injection system? I am not sure if other bikes with the fuel injection system also face a similar problem.

My second query concerns tyre replacement. Is it possible to fit the tyres from the Yamaha R15 or Yamah FZ16 on my bike?

The gear lever of my bike requires too much effort to shift, as if it is stuck in a position. How may I rectify it?

Hasan Arshi, Kolkata

From the description given by you, it does appear that there is a problem in the fuel supply line of your motorcycle. Please take out the fuel filter before the fuel pump and clean it thoroughly. Only a visual inspection by a competent mechanic will yield the correct diagnosis. Whereas the Yamaha R15 and FZ16 come with tubeless tyres, the Apache RTR Fi has tyres with tubes. You may replace the Apache’s front tyre with the FZ16′ front tyre, but the rear tyre of the FZ16 will not fit the narrow rim of your bike. On the other hand, the R15’s rear tyre will be too narrow for the Apache.


Boosting The Dio’s Performance

I recently bought a Honda Dio and am very impressed by its combination of good looks and practicality. The scooter has clocked 4,200 km so far. However, I would like to boost its performance a bit more. Can I fit a K&N air-filter and an NGK iridium spark-plug? Will it be necessary to re-tune the carburettor if I opt for these changes? Is semi-synthetic or fully synthetic engine oil better for my Dio’s performance? Which brand is better: Motul or Mobil1? What type of fuel can I use to get the maximum performance? Can I fit fatter 100/90 tyres on both rims? Where can I fit an HID on my scooter?

Sunny Sharma, Indore

A K&N air-filter or an NGK iridium spark-plug will not give you the big boost of performance that you are looking for. A free-flow exhaust system will also serve to augment the performance of your scooter to some extent. You may use wider tyres, but these will affect your scooter’s performance. A high-intensity discharge (HID) headlight is not feasible for the Dio, for its electrical system does not rely on a battery, which is a must to power an HID. As for oil, the brand does not matter so much as the grade of oil. Please stick to the grade recommended by the manufacturer.

The Case Of The Slipping Clutch

I own a Royal Enfield Bullet 500, which I use only for occasional long rides. It is a 2002 model, which I have kept in mint condition and have had it serviced regularly.

My problem is that when I accelerate hard in the second, third or fourth gears, the clutch slips and the engine tends to rev more than the speed achieved. It does not happen in the first gear, but when I accelerate suddenly, the kick-starter lever falls down and comes up when I ease up on the accelerator. I have had the clutch-plates, clutch-wire and pressure plate replaced and even had bigger springs fitted for the clutch on the advice of my mechanic, but it did not make much difference. Even the chaps at the authorised agency have not been able to help me in this regard.

Ata Hussain Qureshi, via e-mail

When you change the clutch, you have to see to it that there is enough free play in the clutch cable and also in the clutch rod setting. If that is too tight, the chances are that the clutch gets partially engaged, which will cause it to slip and burn out eventually. The load on the clutch is the maximum when you are running in the third and fourth gears. In the first, on the other hand, there is little load on the clutch. That is why you do not suffer slippage in that gear. The fact that the kick-starter lever goes down as you accelerate may be due to the fact that you are using a heavy grade gear oil. Please stick to the grade recommended by the manufacturer. Similarly, try changing the kick-starter return spring.


  1.'rajeshalamuri says

    Hey, I have a 2010 TVS Apache RTR 180. I absolutely love the throttle response of it. Thanks to you guys and the work you put into testing and reviewing bikes I decided to buy it. And now, I am dogged by regrets not for my choice but, for the timing. I want an ABS system on my bike, is that in anyway possible? I am also having the trouble mentioned in a lot forums lately, that “tiny jerking as if fuel almost up” thing and I don’t know what to do about it. I live in a tier 3 city so, good mechanics are hard to come by, let alone great ones. And I also want to change the tyres on my bike, but this time not OEM’s but, something better. Could you please suggest solutions to my three ‘Problems’…?

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