Question about Yamaha YZ 250 Motorcycles

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I need to know how to set timing on 1992 YZ250. Is it in degrees before TDC or in mm of piston travel before TDC. I have noticed on the stator plate that the pickup coil has adjustment as well as the stator plate. I need to get a good initial set up and then fine tune it later, perhaps with a strobe light. Thanks Mike

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My manual is from 1991 but should be the same and shows 1.5mm before TDC measured with a dial gauge down the plug hole.

being electronic ignition the factory setting is usually correct, so it helps to put a punch mark when it is first disassembled, and just put it back where it came from

Posted on Jul 16, 2010

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Posted on Jan 02, 2017

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1 Answer

Ok, what degree before tdc is the spill timing on No one piston?


if you are talking inline fuel pump for a diesel engine ( only unit that allows for spill timing) you set the injection mark on the pointer and spill shut off is at that mark
with diesels there are a number of differences as to the different makes of engines as some are 15 degrees up to 22 degrees but they are all set on the INJ mark
talk with a specialist diesel shop as to the degrees for your make of engine as it is critical to prevent engine damage

Jul 07, 2016 | Cars & Trucks

1 Answer

What is the course of late firing


Late firing or retardant ignition is the condition caused by incorrect ignition timing. Ignition timing is a setpoint established by the engineers as the optimum setting for ignition efficiency. This setting is a few degrees before TDC or top dead center. TDC is the point on 360 degree scale at 0 . This indicates the #1 cylinder has its piston travel at the top
Limit of the stroke. If your condition has firing occurring after the few degrees Before TDC then this can be called late firing. You have a timing issue.

Oct 11, 2014 | 1992 Honda Accord

1 Answer

I replaced my whole distributer in my 1992 2.8 liter v-6 s-10 but my son washed off the alignment marks, so I was wanderind how i can time it? please help!!!


If you know the engine's number one cylinder location, you need to put it at TDC of the compression stroke, then you lower the distributor in so that the rotor ends up pointing to the #1 spark plug wire tower on the distributor cap. As you drop it down, the gear on the dist. shaft will mesh with another gear and turn slightly. You want it ending up pointing directly to #1. Get it seated, then you can start the engine and set the timing according to specs with a timing light.

To find TDC of the compression stroke (as opposed to TDC of the exhaust stroke), pull the #1 spark plug out. Put a socket and wrench on the crankshaft pulley and turn it in its normal direction (clockwise), with your finger over the spark plug hole. As the number one piston is rising on its compression stroke, you can feel the pressure build up under your finger. You won't feel any pressure as the piston rises on the exhaust stroke, only on the compression stroke. So when you feel pressure, you know the piston is rising on its compression stroke, and you can turn the crank on around until the piston is at top of its travel-the notch on the crank pulley will now line up with the zero degrees mark on the pointer scale beside the pulley. There, TDC of compression stroke. Now drop in the distributor so the rotor tip lines up with the #1 spark plug tower on the dist. cap.

Sep 29, 2014 | Cars & Trucks

1 Answer

How to reset timing on 1992 454 tbi after replacing distributer


You have to put the number 1 cylinder at Top Dead Center of the compression stroke, and then you install the distributor with the rotor pointing to the #1 spark plug wire tower that is on the distributor cap.

Pull the spark plug from number 1 cylinder. You need a helper to turn the engine over by hand (using a socket on the crank pulley), or he can bump the starter over in very short bursts. Put your finger over the spark plug hole. When the piston is rising on the compression stroke, you will feel air pressure on your finger. Now look at the crank pulley and turn the engine on over until the zero degrees mark lines up on the timing pointer. Or you can stick a long straw or similar into the spark plug hole (don't let it drop into the cylinder!) to feel when the piston is at top of travel...see, you feel for pressure build up with finger (piston is rising on compression stroke), when you feel it, turn engine on over by hand until the piston is at top of travel-that is TDC of compression stroke. Now install distributor so that rotor ends up pointing directly to number 1 spark plug wire tower. Then follow firing order -as the rotor turns, it will follow the firing order around the dist. cap.
There are two top dead centers of each piston, tdc of compression stroke and tdc of exhaust stroke- to time the engine, you need tdc of compression-that is when the spark plug fires in the cylinder, so that is when you want the distributor in with the rotor pointing to #1.

Jul 28, 2014 | 1992 Chevrolet C/K 3500

1 Answer

2005 gilera smt 50cc there is no timing mark on flywheel did this mark represent tdc?


start a fresh ! plug out and turn piston to tdc and mark flywheel ! have you moved the timing plate ? soz i dont know the degree time this is just to help!

May 12, 2014 | Gilera Motorcycles

1 Answer

How to adjust travel


1 intake down
2 compress up
3 power stroke down
4 exhaust up




if you start with you start with the piston just a couple of degrees past TDC (top dead center) so that it has started its return down


now set the valves so they are closed:
if you have an adjustable valve clearance's then your clearances should be noticeable like 10 thousands ( you should be able to move the lifter ( rocker arm ) and it will be loose up and down


with the spark plug still out; so you can see the piston coming to TDC and passing it to come down


turn the flywheel and watch the strokes and the condition of the valves


1 just past tdc, the intake valve opens and the piston goes down for the intake stroke


2. jst as the piston comes around BDC the intake valve should close and return to tdc with all valves closed ( the compression stroke )


3 just past TDC the ignition will fire and the piston will return down with both valves closed( the power stroke)


4 just past BDC the exhaust valve opend , the piston travels up and completes the exgaust stroke.




and after completing the exhause stroke and arriving at tdc the intake valve opens and you start over again 1,2,3,4

Sep 12, 2012 | Cars & Trucks

3 Answers

I have a 1974 yamaha dt 250 and i have spark and fuel but when i try to stat it it will run 4 1 sec or 2 and than when i try to start it again it will backfire witch has led me to think bout the timing...


Hi Cowboyx16The timing on your DT250 is 1.0 mm before top dead center.
That means you will need a dial indicator to insert in the spark plug hole to measure the piston travel.
You will also need a buzz box or a test light to know when the points break.
Set the gap on the points @ 0.016" then adjust the backing plate up or down to get the points to open when the piston hits 1.0 mm before TDC.


I hope this what you were looking for

Feb 18, 2010 | 1974 Yamaha DT 360

1 Answer

Need to know how to time honda harmony tiller


well
heres your 4 strokes

1 intake down
2 compress up
3 power stroke down
4 exhaust up


if you start with you start with the piston just a couple of degrees past TDC (top dead center) so that it has started its return down

now set the valves so they are closed:
if you have an adjustable valve clearance's then your clearances should be noticeable like 10 thousands ( you should be able to move the lifter ( rocker arm ) and it will be loose up and down

with the spark plug still out; so you can see the piston coming to TDC and passing it to come down

turn the flywheel and watch the strokes and the condition of the valves

1 just past tdc, the intake valve opens and the piston goes down for the intake stroke

2. jst as the piston comes around BDC the intake valve should close and return to tdc with all valves closed ( the compression stroke )

3 just past TDC the ignition will fire and the piston will return down with both valves closed( the power stroke)

4 just past BDC the exhaust valve opend , the piston travels up and completes the exgaust stroke.


and after completing the exhause stroke and arriving at tdc the intake valve opens and you start over again 1,2,3,4

Apr 14, 2009 | Honda Garden

1 Answer

1992 Ford Tempo 2.3 Ignition Timing


#1 tdc it is 10 degrees BTDC you must remove the shorting plug at the dist before setting

Nov 21, 2008 | 1992 Ford Tempo

1 Answer

I'm replacing the head gasket on my friends 96 Saturn SL1 SOHC. I've heard 2 different stories about lining up the crankshaft with the camshaft in order to keep the valves from contacting the pistons. my...


Bring the crank to TDC while WATCHING CAREFULLY the camshaft, making SURE that the pistons are moving in the correct sequence as the valve train. Once you have the #1 piston on TDC, Set up your valve train with what looks to be the most logical position. Then and only then should you consider the factory spec for setting the lead/lag time of the valve train, in degrees. Hope this helps....accordianman

Jul 22, 2008 | Saturn SL1 Cars & Trucks

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