Question about 2003 Yamaha TT-R 125 LE

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Cant figure out how to re-time my ttr125

I have a 2002 yamaha ttr125 i had to replace the piston and course had to remove cam sprocket and now i need to do the timing to see if it will start and i was wondering where are all of the timing marks?

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Posted on Jun 10, 2017

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SOURCE: Yamaha FZ 400 engine timing

hi,normal way to set up fz is as follows,remove left hand engine cover and you will find cdi picups with a backing plate and interrupter tongue,remove all the spark plugs(dont get the leads mixed up),turn the motor by hand up to top dead centre on no1 piston,the tdc mark the plate will line up with the cdi pickup,no1 piston will now be at tdc,both sets of valves ex and intake should be closed and the tappets slightly rocking,if thay are not and any of the valves on no1 piston are open or tight,look to the end of the camshaft (where the cam fits into the bearing surface)and there will be a horizontal mark on each camshaft,release the cam chain tensioner,slip the camchain off the sprockets and rotate the camshaft untill the marks on the camshaft are exactly parrellel to the rocker box mating surface,fefit the cam chain and check alignment then retension the adjuster and check the marks again,if you have it right the marks should still be exactly parellel with the rocker box and the piston should still be sitting at tdc,if it is out by 1 tooth do it again untill it all three marks are exactly right,failing to do this WILL result in a valve sailing through the top of a piston,then it becomes a bigger job again,after you have got them adjusted correctly ,turn the motor over by hand to check that nothing is binding,if you are satisfied that everything is right,then use the starter and you should have compression,hope this helps

Posted on Jul 05, 2009

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I need a diagram of timing chain replacement Thank You


During most engine rebuilds, a completely new timing assembly should be installed. If wear exists on any component, replacement of the entire assembly is necessary. Wear in the chain, gears, or sprockets means a timing lag, which results in poor engine performance.
The timing chain or belt is generally installed with the gears in their correct positions. Before installing a new chain, soak it in oil.
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Some OHC engines use a chain drive; others use a belt drive. Removing the cover on some OHC engines that have timing chains is more difficult, because the cover often fits between the oil pan and the cylinder head. There are special procedures for replacing cam timing components in these engines.
Before a chain repair job, perform a leakage test on non-freewheeling engines to check for bent valves, so that an accurate repair estimate can be made.
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On many OHV pushrod engines, the crankshaft sprocket is installed on the crankshaft nose and the crankshaft is rotated to position piston #1 at TDC. At this point, a mark stamped onto the crankshaft sprocket is pointing directly upward (toward the camshaft).
The camshaft sprocket is then temporarily bolted to the cam and used to rotate the cam until a mark stamped on the cam sprocket is pointing directly downward (toward the crankshaft). The sprocket is then removed from the cam (without allowing the cam to rotate).
The timing chain is looped over the cam gear, the mark on the cam gear is positioned directly downward, and the chain is looped around the crankshaft sprocket. When the cam sprocket is attached to the cam, the timing marks on the crank and cam sprockets should be pointing toward one another. NOTE THIS IS FOR 2WD 4.0

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Hi there Longhatx....Ok...Turn the crankshaft counterclockwise until the " I " mark on the rotor is aligned with the stationary pointer on the crancase cover.Fit the timing chain onto both camshaft sprockets and install the camshafts on the cylinder head.The camshafts should be installed onto the cylinder head so that the exaust cam sprocket punch mark " E " and the intake cam sprocket punch mark " I " align with the surface of the cylinder head,both marks facing out of course towards their prospective ports.thats about it .Please leave some feedback if this has helped . ride on.

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1 Answer

Need to change timming belt 1997 geo tracker


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1. Crank Pully Bolt 2. Crank Pully 3. Center Bolt 4. 5mm Hex drive (used to remove pully bolts) Once the fan stuff, and pully(s) are removed, then you need to remove the Timing Belt cover:

Once the cover is removed, you will need to loosen the adjusting nut and pully bolt on the Belt Tensioner:
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Then, you can slip the timing belt from the sprockets. Check the tensioner for roughness and excess play! DO NOT MOVE THE CAM OR CRANK SPROCKETS! IF you do, then you will have to line up the Crank and Cam for piston number one at Top Dead Center before placing the new timing belt on! Note the timing marks on the crank and camshaft sprockets. IF YOU MUST! Allign the Cam and Crank at piston#1, Top Dead Center before removing the belt. Each sprocket has a small hole, with a line through it, and there is a small groove or "V" it alligns with on the engine. Now, once the timing belt is off, look at your new timing belt. Older belts use the Squared off teeth, while new ones have the rounded teeth. Make sure you have the correct belt for your sprockets! Never reinstall a belt that is in questionable condition. BELT WEAR CONDITIONS
If there are Arrows on the belt, they must be pointing to the RIGHT when you put the new belt on the sprockets. If there isn't one, then paint one on, and place the belt back on the sprockets. The arrow will indicate to a mechanic, this is the way the belt must be put back on (if they replace any cam or crank oil seals). Slip the new belt onto the Crank sprocket. While maintaining tension on the side of the belt opposite the tensioner, slip the belt onto the Camshaft sprocket. Releace the Tensioner adjusting nut to allow spring tension against the belt. Temporarily reinstall the crank pully, taking care to align the notch in the pully with the raised area on the sprocket. Rotate the crank clockwise two complete revolutions. Recheck the alignment of the of the valve timing marks. If they do not align properly, loosen the tensioner, slip the belt off the crank pully, align the timing marks, reinstall the belt, and check alignment again. Tighten the tensioner nut, then the bolt. Reinstall all parts removed, in the opposite order, of course. Start the engine and allow to reach normal operating temp, then road test. THEORETICALLY, you should simply be able to replace the belt with the new one, and go, as long as you did not move any of the sprockets when removing or installing the belt. Most people do it this way, and do not test for alignment before replacing everything. When the belt wears, timing will be off, very little, and this is why you check alignment. The belt may have slipped a tooth, making the timing off. This is why the Cam and Crank sprockets must both align properly. An experienced person will do just that: Replace the belt, and go. It really isn't all that hard. It helps to have a second person around with some experience also.

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1 Answer

How do i remove the cam chain off the sprocket? undo the 2 screws out the sprocket and slide the sprocket across and down or?


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1 Answer

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1 Answer

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1 Answer

Yamaha FZ 400 engine timing


hi,normal way to set up fz is as follows,remove left hand engine cover and you will find cdi picups with a backing plate and interrupter tongue,remove all the spark plugs(dont get the leads mixed up),turn the motor by hand up to top dead centre on no1 piston,the tdc mark the plate will line up with the cdi pickup,no1 piston will now be at tdc,both sets of valves ex and intake should be closed and the tappets slightly rocking,if thay are not and any of the valves on no1 piston are open or tight,look to the end of the camshaft (where the cam fits into the bearing surface)and there will be a horizontal mark on each camshaft,release the cam chain tensioner,slip the camchain off the sprockets and rotate the camshaft untill the marks on the camshaft are exactly parrellel to the rocker box mating surface,fefit the cam chain and check alignment then retension the adjuster and check the marks again,if you have it right the marks should still be exactly parellel with the rocker box and the piston should still be sitting at tdc,if it is out by 1 tooth do it again untill it all three marks are exactly right,failing to do this WILL result in a valve sailing through the top of a piston,then it becomes a bigger job again,after you have got them adjusted correctly ,turn the motor over by hand to check that nothing is binding,if you are satisfied that everything is right,then use the starter and you should have compression,hope this helps

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1 Answer

91 chevy G20


well not sure exactly why it wont line up use something to turn the crank and cam to appropiate position start sliding crank gear until cam gear is touching then start to push both at same time make sure your crank key and cam pin are bothin place On many OHV pushrod engines, the crankshaft sprocket is installed on the crankshaft nose and the crankshaft is rotated to position piston #1 at TDC. At this point, a mark stamped onto the crankshaft sprocket is pointing directly upward (toward the camshaft).
The camshaft sprocket is then temporarily bolted to the cam and used to rotate the cam until a mark stamped on the cam sprocket is pointing directly downward (toward the crankshaft). The sprocket is then removed from the cam (without allowing the cam to rotate).
The timing chain is looped over the cam gear, the mark on the cam gear is positioned directly downward, and the chain is looped around the crankshaft sprocket. When the cam sprocket is attached to the cam, the timing marks on the crank and cam sprockets should be pointing toward one another.

Feb 10, 2009 | 1992 Chevrolet G20

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