Question about 2002 Yamaha YZ 426 F

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Yamaha yz 426 2002 set timing with crankshaft with index marks done this and camshafts oppisite facing , cylinder head lined with cam wheels how do i tell which is the compression stroke as might be 180 degree out . after moving cam shafts

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  • Anonymous Mar 15, 2014

    2004 1100 yamaha v star. I have removed my crankshaft gear and my #1 cylinder upper and lower head, camshaft gear and lower cam gear on the #1 cylinder. My crankshaft is not aligned with my #1 cylinder for reassembling. I was wondering how I can make sure that when I put the crankshaft gear and camshaft gear back together that they are in alignment with each other on the #1 TDC and not the compression stroke.

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The spark will fire at top dead center and you can see it with a timing light or in the dark with the spark plug removed from the cylinder head but still connected to the coil wire and grounded against the motor (don't hold the plug or you will feel a shock, hold it by the rubber insulator.

Posted on Dec 28, 2009

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Take the sparkplug out and crank it over slowly when air pushes out is usually a compression stroke stop when the piston reach's the top..spin it over 2-3 times make sure you feel air rushing out the sparkplug hole put your finger in the hole it should push your finger out .

Posted on Nov 19, 2009

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Stick your finger over intake valve and begin to turn over motor, when you feel suction through intake valve you know the next stroke is the compression stroke.

Posted on Nov 19, 2009

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Need know how set timing on Yamaha v-star classic 2002


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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

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Most motorcycle cam gears have a mark on one tooth, often just a punch mark, sometimes an "o". Usually this mark should be "straight up" in line with the cylinder when the engine is at top dead center on the compression stroke. Double-check your service manual to be sure for a particular bike.

So here's how you set it. Remove the flywheel cover and rotate the engine so that the piston is at top dead center. There should be a "TDC" or "T" mark on the flywheel, and some sort of corresponding mark or pointer on the engine case to line this up with. To make sure, remove the spark plug and verify with a flashlight that the piston is as high as it can be when the marks are lined up.

Now rotate the cam gear until the punch or "o" mark is at the very top of the engine (in line with the cylinder, if the cylinder is slanted). At this point, neither the intake nor the exhaust valves should be open.

Now connect the cam chain while both the crankshaft and the cam gear are in these reference positions, and you are done!

best regards,

Marty

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1 Answer

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I assume you are talking about the cam timing. If so, then you first turn the engine so that the "T" mark on the flywheel lines up with the index mark in the timing hole cover. This places the piston at top dead center (TDC). Now position the camshaft so that the cam lobes are both facing downward. Align the two marks on the cam sprocket with the cylinder head cover gasket surface (making sure the piston is still at TDC). Install the two bolts through the sprocket and screw them into the camshaft. Done.

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