- Joined
- May 13, 2014
- Messages
- 710
- Reaction score
- 675
Saw won't run, and I think it may need a new coil. I have not experienced a dead coil before to understand symptoms. I know, air / fuel / spark.
I bought it not running. I put in a new spark plug when I got it and ran it for a few minutes before taking it apart — plug that came in it was missing the aluminum nut. I idled and rev'd it a few times but did not hold it WOT.
I finished reassembly (separate thread), changed one crank seal to fix a leak, verified it passes a vacuum test of 15 inHg for 15 min, didn't move at all. New Zama rebuild kit for the carb.
It fired up but seemed a tad rough. I haven't owned a saw this large for reference though. I let it idle for several minutes while adjusting the L screw. I held it WOT and it ran for a few seconds then it just shut off. Would not restart and won't start now.
I am fairly sure it is getting fuel, it is wet in the cylinder. I sprayed some premix in the spark plug hole and it still didn't start. Disassembled the carb twice and looked it over, all passages appear clear and it holds pressure. Compression is still 140psi.
It is sparking but it looks weak to me. I changed the new BPMR7A OE plug for a non-resistor plug and it fired up and blew a TON of smoke and oil. Wouldn't quite idle though. I put the BPMR7A back in and it will not start. It seems like it is trying (can feel it a bit on the cord) but it just won't start. Weak with a resistor plug makes me think the coil is bad?
I do not have another saw I can borrow a coil from, only have AT saws.
Here is a shaky video of the spark, best I can do while pulling the recoil over:
I bought it not running. I put in a new spark plug when I got it and ran it for a few minutes before taking it apart — plug that came in it was missing the aluminum nut. I idled and rev'd it a few times but did not hold it WOT.
I finished reassembly (separate thread), changed one crank seal to fix a leak, verified it passes a vacuum test of 15 inHg for 15 min, didn't move at all. New Zama rebuild kit for the carb.
It fired up but seemed a tad rough. I haven't owned a saw this large for reference though. I let it idle for several minutes while adjusting the L screw. I held it WOT and it ran for a few seconds then it just shut off. Would not restart and won't start now.
I am fairly sure it is getting fuel, it is wet in the cylinder. I sprayed some premix in the spark plug hole and it still didn't start. Disassembled the carb twice and looked it over, all passages appear clear and it holds pressure. Compression is still 140psi.
It is sparking but it looks weak to me. I changed the new BPMR7A OE plug for a non-resistor plug and it fired up and blew a TON of smoke and oil. Wouldn't quite idle though. I put the BPMR7A back in and it will not start. It seems like it is trying (can feel it a bit on the cord) but it just won't start. Weak with a resistor plug makes me think the coil is bad?
I do not have another saw I can borrow a coil from, only have AT saws.
Here is a shaky video of the spark, best I can do while pulling the recoil over: