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setting timing on a 2 stroke engine


flatyre
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just fitted a new pot and piston to my Makita DPC6400 and can't get it to start, not even a splutter. it has good spark and a refurbed card, but even when I put petrol straight into the bore it still won't even fire. Can you mess up the timing on a 2 stroke, and how do you re-set it?

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You have ignition timing set by the flywheel magnet position, the flywheel key, the crankshaft and the coil.

 

You also have port timing which is set by the position and height of the cylinder and the dimensions of the piston.

 

If the correct parts are used, the ignition timing can be knocked out by a broken flywheel key or a coil failing. The timing of the cylinder can't be changed without grinding out metal or changing base gasket height.

 

It is more probably that the carb has been rebuilt incorrectly or there is another fundamental error with the rebuild.

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If it's got a good spark and it's not kicking with fuel straight down the plug hole There's something fundamentally wrong, did you fit the piston rings ? :D (only kidding) If it was running before and you've done nothing to the flywheel then there should be no alteration to the timing. Even without the key the nut will hold it in place if it is tight.

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Has it got the correct coil fitted?? , many Makita /Dolmar models have different versions of ignition coils for one model of saw , if the wrong one is fitted the timing can be radically different , been there myself with a DCS500 fitted a black coil rather than red , would not even try to start

 

 

Sent from my iPhone using Tapatalk

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