Question about 2005 Honda CRF 250 R

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Rebuilt top end and now wont start just backfires but all timing

I got the timing marks lined up and everything eles but it wont start it just backfires sometimes

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Check your shims.prob got a valve open.

Posted on Jul 27, 2009

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If you went by the manuals timing mark instructions you should be fine but i'd bet its still not in time. the lines on the cam should line up parrallel with the head casting, most times it looks like they are but its still one tooth off, i usuall put tensions the chain with my finger to see how parralell they are.. make sure the motor is in top dead center compression also. the manual is what shows your at tdcc.

Posted on Jul 12, 2009

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I have jusy replaced the head gaskets on the motor but i cant seem to get in back in time ive tried to turn the disturbitor but its like it backfires what is the standard time line for this motor.

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Sounds like the timing marks between the crank and camshaft are off. Turn the engine over manually until the crank pulley is at top dead center(TDC) remove the timing belt cover, and check to see if the camshaft marking (notch) is pointing at the proper mark, which I believe is aligned with the front side of the cylinder head on that model, but check the timing belt alignment specs to be sure.

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2001 ford taurus, 3.0 vulcan motor. just rebuilt the whole motor, backfires out of the intake, seems to be out of firing order. i triple checked my work and can't find the problem. whistling sound of...

Back firing out of the intake is because the valves/cams are not set right. When you did the timing belt . did you set the crankshaft mark at top dead center of the compression stroke. If it's at the exhaust stroke this would cause backfiring and violent shaking.

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I replaced my cylinder head gasket.after putting everything together,i tried to start it but it won' cranks and backfires. i double checked everything and timed it several times by positioning the...

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I'm helping a guy who rebuilt a 1983 sportster, th...

As strange as it sounds, the TDC mark on the crank has nothing to do with the cam timing on a Harley engine, neither the Sporty nor the Big Twin. Disregard the timing marks on the crank except for ignition timing.

To time the cams, start with the pinion gear. The timing marks on the gear and the end of the crankshaft must be aligned. Then install cam #1 and #3 so that their marks align with the marks on the #2 cam. The marks on the #2 cam must also align with marks on the pinion gear. So on the # 2 cam, you have three sets of marks that must align. Once you get these, align the #4 cam. The idler gear and generator gear do not have marks. On the '83 model, there is no timing marks on the oil pump either.

Now with the cams aligned, make sure you adjust your valves to zero backlash but you'll still be able to turn the pushrods with your fingers.

On the ignition timing, bring the front piston to TDC on the compression stroke. Now, bump the engine backwards until the piston is about half way down the bore. Check this using a common plastic drinking straw in the spark plug hole. Now, bump the engine in the direction of rotation until you see the first mark. This is the advance timing mark for the front cylinder. Continue to bump the engine in the direction of rotation. You may see another mark at the front cylinder retarded timing position. Then continue to bump the engine in the direction of rotation until you see the TDC mark and the piston is at TDC. Time you engine to the advanced front cylinder timing mark.

If you have anymore questions, contact me directly at wd4ity at I'll scan a picture for you.

Good Luck

May 15, 2010 | Motorcycles

1 Answer

Just put new timing kit on 95 gmc sonoma 2.2liter and lined marks up. truck still wont start. do i need to put number 1 cylinder on tdc before i start the truck. when trying to start it backfired a little.

click the ignition so #1 cylinder is at top dead center then pull youre distributer cap off make sure the rotor is pointing towards # 1 cylinder if not you re timing is 180 deg off pull the distributer out a little and turn the rotor to # 1 cyl you probaly dont have the timing marks lined up correct if the timing is off it will back fire either out the air filter or exhaulst ..

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