dcs 5000

[Eddy_t]

I'm going to go out on a limb here but... Have you checked the flywheel position and coil gap? The flywheel key may have sheared or fallen out or the coil gap may be too large, retarding and limiting the ignition to 8k rpm

[billpierce]

right, took exaust off and gasket was the wrong side od the heat shield. popping as stopped. wierd on offy revving has ceased also, perhaps it had remnents of shite fuel in or something. its revving to 11.4k max now with a 15'' bar (without me adjusting.) so i guess its a bit on the rich side, perhaps a precaution of this overheating issue. i'll keep an eye on the plug and maybe lean it out a bit in time.

 

its a red lead to the spark by the way.

 

thanks

[billpierce]

I'm going to go out on a limb here but... Have you checked the flywheel position and coil gap? The flywheel key may have sheared or fallen out or the coil gap may be too large, retarding and limiting the ignition to 8k rpm

 

i'll check, thanks

[spudulike]

its a red lead to the spark by the way.

 

thanks

 

Ah, that's the devils lead - the saw won't work on a Sunday with a red lead:001_rolleyes:

[billpierce]

Ah, that's the devils lead - the saw won't work on a Sunday with a red lead:001_rolleyes:

 

just my luck! seems to be running better in fresh fuel.

[billpierce]

so, it was running ok but like i say max rpm 10-11.5k no load with b and on, it was a bit wierd on full throttle with no load like it missed a fire from time to time, but this disappeared when in the cut. so i thought this was just the limited coil.

 

so yesterday i leaned it slightly but the rpm went down, so i richened to beyond the point it was at and it also went down. so i put it back to exactly where it was. and thought that would do. but was slightly bothered by it.

 

then i checked plug colour which was fine, but then there was no spark!

 

i have checked the connection from wire to spark plug which is good, and have aslo checked the other wires and there is no faults i can see. i also rechecked the coil gap and connections around coil and all seems fine, the flywheel is sat on its spline ok too. from the spark cap to earth reads 1.3 ohms which is significantly lower than on another saw i tried which was around 10. have i gone mad/or broken something, or has the coil been breaking down and now has gone?

 

as per usual i appreciate all the advice

[billpierce]

i have also tried the coil with the wee wire going to the switch disconnected to see if this if its earthing somewhere to no avail.

[SawTroll]

so, it was running ok but like i say max rpm 10-11.5k no load with b and on, it was a bit wierd on full throttle with no load like it missed a fire from time to time, but this disappeared when in the cut. so i thought this was just the limited coil.

 

 

That would be pig rich if it was caused by the carb adjustment - but it really sounds like your coil either is limited way too low down, or otherwise defective.

[billpierce]

That would be pig rich if it was caused by the carb adjustment - but it really sounds like your coil either is limited way too low down, or otherwise defective.

 

plug looked fine so sadly i reckon the coil is goosed. is there anything i haven;t checked?

[Eddy_t]

Have you checked the coil-flywheel gap? It should be about a business card space between.

But no spark is no spark, sounds like your coil is dying!