Timing

indr · April 1st, 2013, 12:32 PM

The whole top end is off. I want to put it back together. Is there another way to find TDC of either #1 or #2 piston besides looking down the inspection plug on the alternator cover and aligning the mark on the alternator rotor and the projection on the inspection plug (as described here below).

I ask because, I have done valve adjustments in the past, and the marks on the inspection plugs have never lined up for the true TDC for #2 piston.

I need to find it before I can hook up the crankshaft to the cams up top w/ the cam chain.

Racer x · April 1st, 2013, 01:22 PM

You have to line the #2 line with the bump inside the cover. You can assemble the bottom end up to the head , Leave the head off and bolt down the block with some spacers. Just one or two bolts,Pull the cam chain tight befor you turn the crank.But then you can use a dial indicator to determine exact TDC

http://www.ephotomotion.com/914engin...ding%20tdc.jpg

choneofakind · April 1st, 2013, 01:23 PM

Yeah, pull the head off and watch the number 2 cylinder to see when it's at the top of its stroke. You might be able to do the same thing by looking through the spark plug hole with a flashlight.

Motofool · April 1st, 2013, 01:25 PM

You can always use the spark plug hole and a pencil or wood rod, in combination with the position of the cams.

Consider that there are two top-dead-center positions for each piston.

Check this post for more detailed description:

http://www.ninjette.org/forums/showp...3&postcount=22

http://www.dailymotion.com/video/xyd...o#.UVnwQhe-q9U

tubarney · April 1st, 2013, 09:55 PM

you will get a few degree of crankshaft rotation with the piston staying the same height.

The only way to find true top dead centre is with a piston stop (piece of metal with a screw in the middle) and a crankshaft 360 degree wheel.

http://www.youtube.com/watch?v=-VwsbEg7Z4I

I'm sure the engineer's made the teeth on the gears for the cams enough distance apart where you can just use the screwdriver method. Stick one in the spark plug hole. This is what the local kawa dealership mechanic told me to do.

Or you can always stick a rag in the spark hole and wait for it to pop.

April 1st, 2013, 01:25 PM	#4
Motofool Daily Ninjette rider Name: Hernan Location: Florida Join Date: Mar 2011 Motorcycle(s): 2007 Ninja 250 Posts: A lot. MOTY - 2016, MOTM - Dec '12, Jan '14, Jan '15, May '16	You can always use the spark plug hole and a pencil or wood rod, in combination with the position of the cams. Consider that there are two top-dead-center positions for each piston. Check this post for more detailed description: http://www.ninjette.org/forums/showp...3&postcount=22 http://www.dailymotion.com/video/xyd...o#.UVnwQhe-q9U __________________________________________________ *Motofool* *.................................Never ride faster than your guardian angel can fly* "Mankind is composed of two sorts of men — those who love and create, and those who hate and destroy. Love is the bond between men, the way to teach and the center of the world." - José Martí

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April 1st, 2013, 12:32 PM	#1
indr ninjette.org guru Name: . Location: . Join Date: Nov 2010 Motorcycle(s): . Posts: 331	Timing The whole top end is off. I want to put it back together. Is there another way to find TDC of either #1 or #2 piston besides looking down the inspection plug on the alternator cover and aligning the mark on the alternator rotor and the projection on the inspection plug (as described here below). I ask because, I have done valve adjustments in the past, and the marks on the inspection plugs have never lined up for the true TDC for #2 piston. I need to find it before I can hook up the crankshaft to the cams up top w/ the cam chain.

April 1st, 2013, 01:22 PM	#2
Racer x ninjette.org certified postwhore Name: Eric Location: Iowa City Join Date: May 2009 Motorcycle(s): 2008 Kawmeracchi 350 2010 Project X Posts: A lot. Blog Entries: 54 MOTM - Sep '18, Feb '16	You have to line the #2 line with the bump inside the cover. You can assemble the bottom end up to the head , Leave the head off and bolt down the block with some spacers. Just one or two bolts,Pull the cam chain tight befor you turn the crank.But then you can use a dial indicator to determine exact TDC http://www.ephotomotion.com/914engin...ding%20tdc.jpg __________________________________________________ Top speed 123.369mph. Ohio mile Worlds fastest 250 ninja

April 1st, 2013, 01:23 PM	#3
choneofakind ninjette.org certified postwhore Name: . Location: . Join Date: Feb 2011 Motorcycle(s): . Posts: Too much. MOTM - Feb '13, Feb '14	Yeah, pull the head off and watch the number 2 cylinder to see when it's at the top of its stroke. You might be able to do the same thing by looking through the spark plug hole with a flashlight.

April 1st, 2013, 09:55 PM	#5
tubarney ninjette.org sage Name: Brad Location: Sydney Join Date: Mar 2012 Motorcycle(s): Ninja 250r 2010 SE Posts: 573	you will get a few degree of crankshaft rotation with the piston staying the same height. The only way to find true top dead centre is with a piston stop (piece of metal with a screw in the middle) and a crankshaft 360 degree wheel. http://www.youtube.com/watch?v=-VwsbEg7Z4I I'm sure the engineer's made the teeth on the gears for the cams enough distance apart where you can just use the screwdriver method. Stick one in the spark plug hole. This is what the local kawa dealership mechanic told me to do. Or you can always stick a rag in the spark hole and wait for it to pop.