Yasser this is the exact same problem that was faced by me. I would like to get to an answer to any of these questions as well.

Just a sidebar, have you been indulging in any kind of off-roading/bad-roading off late?

Off roading..nope! but bad roading...well you can't avoid them in Hyderabad. But I have always been careful.

Like Vishwas brother did, you guys must consider escalating the issue to get a satisfactory answer/solution to the problem.

Reply

1) How and why did the cap get dislodged?

This usually happens if the cap has not been placed properly during a service and the bike is ridden on bad roads due to vibration.


2) If the problem was because of the spark plug, why only after a few kms?

3) Why was the engine becoming hot?

As the engine is capable of delivering the torque, during the first few kms the fuel buildup in the dead cylinder will be less and not put strain on the functioning cylinder. Once the build up is sufficient the functioning cylinder will have to move both its cylinder and the dead cylinder thereby increasing the work load and hence the drop in power and the heat generation.

+1. There is a phone number (toll free?) on the owners manual for any complaints / suggestions (first page i guess).

Please call this number and register a complaint.

Issues like this make me nervous especially before a long ride out of the city limits. If there were many service centers like maruti has, then i wouldnt be so worried.

Pune PBK arranging G2G for Ninja owners on Sat 30th Oct

Friends,

I got a call yesterday from Pune PBK. They are arranging G2G on 30th Oct at 10AM for the Ninja owners near Ruby Hall. They have plans for some ppt, DIY for Ninja and a small ride. Also Kawasaki folks will be in town and they will reveal their India plans. Hope to meet fellow xbhpians there

Who else got the call and plan to join?

Why are you posting it twice here & once in the pune G2G thread.

It is considered as spamming & against the rules.

I had got a call from them about a week back. They were supposed to send an official email but I havent got it yet. I am planning to attend.

same here. Still no mail or schedule. Lunch at Le meridian.

I didnt recieve any call yet. Seems they dont want me there.

was waiting for this to be here, got a call a week back but no updates after that. btw what is the ride all about? anybody care to explain

Makes immense sense...

The Beast

Whats better than a Mean Green Ninja 250R with Two Bros Carbon Exhaust, Fender Eliminator Kit and a Carbon Fiber tank pad ? NOTHING ! \m/ In love with the beast all over again ! ♥

pictures please.. planning such mods for a while, could you give more details

Itzli: You're right in conjecturing about the first point - the reason why the plug came loose. Your reasoning for the second is however erroneous.

The engine is overheating and the problems is precipitated by a few kilometers of running not because of fuel accumulation inside the cylinder with the non-functioning spark plug. 4-stroke engines work on the principle of forced expulsion of gases during the exhaust stroke i.e the piston pushes the gases out of the cylinder with force during its upstroke with the exhaust valve open. So nothing accumulates inside the cylinder as long as the valves are opening and closing as they should.

The 'delayed' heating up and loss of power happening in Yaseer's bike is due to two reasons.
1. That the engine is running on only one cylinder and that is overloading the engine by itself. Any constant overloading of an IC engine will lead to overheating.
2. The same working cylinder is also carrying the load of the non-functional cylinder which is just running as a power-sapping pump!

These two tasks are putting too much load on the single functioning cylinder. The overloading induces a heat build up, which at first is coped with well by the liquid cooling but after a while there's more heat being added to the system than it is capable of rejecting. As a conjecture, had this been an air-cooled engine, the few kilometers would have been reduced to just a kilometer or two. Also a loose spark-plug cable weakens the spark (in case the plug cap is loose but resting on the spark-plug top), so effectively retarding the ignition and producing lots of residual heat in the faulty cylinder which fires intermittently.

Interestingly, air-head Harley's at one time had a 'parade mode' selectable by the rider. This had to do with constant low speed low gear operation, like in a parade, that would lead to the rear cylinder in a V-twin heating up due to the lack of cooling air circulation around it and at times seizing. The rider could switch off the rear cylinder's ignition while in the parade to stop that heat build-up. Of course, even a single cylinder firing on a 1200cc engine produced enough torque to keep the bike going effortlessly at low speeds.