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Re: Yamaha YZF-R15 version 2.0
^^^ Where do you people get these ideas from???
... Do you know these things as facts or is it just folklore with out any foundation in facts? Here are some facts:
1. Engine is not a brake. Period!!! It is not meant to slow the bike down.
2. Engines are made for driving and accelerating vehicle. If you are using engine as a brake, then thats one heck of an expensive brake while being a imprecise one too. The cost of slowing a bike or for that matter any other vehicle with engine is the additional wear and tear of all moving components in the engine. Brake pads cost fraction of what engine internals cost.
3. Brakes are meant (and designed) to slow bikes down and are very precise tools which regulate slowing a vehicle down (you can control deceleration down to 0.01 km/h). If you are not able to achieve such precise control then you have not yet developed the braking skills required. Work on your braking skills and learn precision control rather than slamming down gears to slow down.
4. What you consider good braking as a healthy sign is nothing but back torque being created due to mis-match of engine speed and rear wheel speed. When you downshift without matching the engine speed to the rear wheel speed, the engine and rear wheel push-pull till both speeds match. When you down shift, depending upon the gearbox ratio it will mean that the engine speed is now lower than what it was in the pervious gear, while the rear wheel speed is still what it was when the previous gear was engage. Thus there is now a mis-match of speeds between two spinning bodies. The engine will now try to drag the rear wheel speed down, whereas due to Newton's third law of motion, the rear wheel will resist by trying to apply equal force to spin the engine to meet its current speed. Hence, you see the temporary increase in rpm when you downshift and engage the engine. Eventually, the engine is successful in exerting more force due to its mass (internal components) and brings the rear wheel speed down to match the engine speed.
Now based on point 4, will someone please explain to me how engine is brake????
^^^ Where do you people get these ideas from???
... Do you know these things as facts or is it just folklore with out any foundation in facts? Here are some facts:1. Engine is not a brake. Period!!! It is not meant to slow the bike down.
2. Engines are made for driving and accelerating vehicle. If you are using engine as a brake, then thats one heck of an expensive brake while being a imprecise one too. The cost of slowing a bike or for that matter any other vehicle with engine is the additional wear and tear of all moving components in the engine. Brake pads cost fraction of what engine internals cost.
3. Brakes are meant (and designed) to slow bikes down and are very precise tools which regulate slowing a vehicle down (you can control deceleration down to 0.01 km/h). If you are not able to achieve such precise control then you have not yet developed the braking skills required. Work on your braking skills and learn precision control rather than slamming down gears to slow down.
4. What you consider good braking as a healthy sign is nothing but back torque being created due to mis-match of engine speed and rear wheel speed. When you downshift without matching the engine speed to the rear wheel speed, the engine and rear wheel push-pull till both speeds match. When you down shift, depending upon the gearbox ratio it will mean that the engine speed is now lower than what it was in the pervious gear, while the rear wheel speed is still what it was when the previous gear was engage. Thus there is now a mis-match of speeds between two spinning bodies. The engine will now try to drag the rear wheel speed down, whereas due to Newton's third law of motion, the rear wheel will resist by trying to apply equal force to spin the engine to meet its current speed. Hence, you see the temporary increase in rpm when you downshift and engage the engine. Eventually, the engine is successful in exerting more force due to its mass (internal components) and brings the rear wheel speed down to match the engine speed.
Now based on point 4, will someone please explain to me how engine is brake????
I didnt tell I use engine as a brake. By engine braking I meant the force with which engine slows down my bike when I roll-off the throttle.. Say am doing 90kmph and I roll-off the throttle and the bike slows down or deccelerates a bit faster. This is what I meant. If you have any views, please advice 
No prob with brakes since it goes freely when I press the clutch
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