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post #1 of 8 Old 03-30-2011, 06:20 PM Thread Starter
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help with timing

i think my 98 arctic cat 300 may have jumped timing so i need to know howto check the timing marks

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post #2 of 8 Old 04-02-2011, 02:29 PM
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help with timing

According to the factory manual attach a timing light to the spark plug high tension lead. Remove the timing inspection plug from the left side crankcase cover timing should be 5 Deg btdc. at 1800 rpm 30 Deg above 3800 rpm.
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post #3 of 8 Old 04-02-2011, 02:47 PM
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Originally Posted by grasshopper View Post
According to the factory manual attach a timing light to the spark plug high tension lead. Remove the timing inspection plug from the left side crankcase cover timing should be 5 Deg btdc. at 1800 rpm 30 Deg above 3800 rpm.
A lot of flywheels to NOT have timing marks stamped on them, just the TDC mark. If this is the case the only way to determine 5 degrees BTDC or 30 degrees BTDC is to attach a degree wheel to the flywheel with zero set at TDC. Maybe the 300 does have timing marks at 5 and 30 degrees. Most do not. Timing is not adjustable, but can be checked to insure the key on the crank shaft is not stripped, trigger coil on the Stator is working and the CDI box is working as it should.

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Last edited by Wyo_H1_Cat; 04-02-2011 at 02:49 PM.
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post #4 of 8 Old 04-02-2011, 02:52 PM
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Which timing are you referring to. Spark timing or valve timing.

Spark time is fixed and controlled by the crank trigger. Theres only two thing that can change spark timing. a twisted crank ( very rare ) a sheared flywheel key (Also very rare)

Valve timing, remove the timing inspection plug and the the pull start housing, you will use the nut on the crankshaft under the pull start to turn the crank to bring the timing mark into the timing inspection hole. remove the spark plug so your not fighting engine compression to turn the motor.

Now remove the the valve cover and check the alignment line on the cam. the alignment line should be level with the top of the edges of the cylinder. if not you have a problem.

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post #5 of 8 Old 04-02-2011, 03:01 PM Thread Starter
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i removed the pull start today and i didnt notice a marking on there, i know what im looking for cause i set my timing on my 3 wheeler

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post #6 of 8 Old 04-02-2011, 06:08 PM
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Above the pull start in the top side of the case is a plug that is opened with a allen wrench, about 1 inch dia. this is where you can see the timing mark.

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post #7 of 8 Old 04-02-2011, 06:51 PM Thread Starter
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alright so i take it, its nothing like three wheelers lol cause i remember on the 200 atv i had to pull off the pullstand then take the bolt off and pull the rotar and take the casing off. this is for valve timing im quite sure? is that what the plug is for tex? if so nice to see i dont have to pull my rotar and etc off lol

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post #8 of 8 Old 04-02-2011, 08:34 PM
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The plug is for the time mark on the flywheel, usually just one line for top dead center.

you can yo it with the rope but you usually end up blowing by the mark.

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