Question about Makita Tools 18V 1/2" Lxt Lithium - Ion Hammer Driver - Drill Kit - BHP451

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Makita dpc6410 not starting

My stone cutter is not starting. it has a good spark, compression is good and turns over and fuel seems to be getting through

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I know you said the compression is good, but the number one problem with these saws is the cylinder dusting out (scaring).

before you tear off the cylinder, just double check a few things.

your fuel mixture is good
your decompression valve (depending on year bought) is not seized in the open position
you exhaust isnt blocked
check the plug (my 14" makita uses plug BPMR7A, sometimes i find a BPM7A in it)

if everything looks good, i'm sorry to say you're going to have to remove the cylinder.

remove the filter cover and starter coil
remove the shroud holding the paper filter being held on by 4 screws
remove the plug and unscrew the ground wire from the cylinder shroud and push them aside
remove the 3 remaining screws from the cylinder shroud and remove (it wont come off easily)

now you should be looking at the carb assembly hooked into the cylinder by 2 connections. loosen the hose clamp as much as you can, and be EXTRA careful removing the small hose connection. (they love to rip)

you can either remove the carb housing or leave it in. if you leave it in, you're just going to have to move the cylinder around it to get it free. if you take it out, you just have to make sure you plug the fuel supply and prevent debris from getting into the tank from the top.

i usually take the cylinder and exhaust off as one piece because the 2 exhaust screws love to get seized up in the older saws and it's just more of a hassle than it's worth. remove the 4 screws holding the cylinder down and you should be able to pull the cylinder straight up.

look for discoloration around the exhaust port and vertical lines, also check the piston to make sure the ring isnt fused to it, or broken.

i'll keep my eye on this, so if you have more questions i'll try to keep up.

Posted on Nov 23, 2008

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