StihlNAlberta
ArboristSite Member
So my friends i am looking for some guidance. Calling all "MAC" pros.
Finally found time to open up my nice old SP 125. Been a while but it did fire after a tad of priming ... ran for about 2 minutes then she just died.
1. Changed plug
2. Checked compression .... 160. Kill switch wasn't off and throttle was not @ WOT. oops.
3. Fuel Filter ok, lines ok.
4. NO carb rebuild but when it ran for that short time it ran great. Idled, reved up and was responsive.
5. Pulled recoil cover and checked wires, all looked ok.
6. Pulled off kill switch wire from coil and pulled .... no spark
Ordered a coil and changed it out. The coil fit pretty tight against the head/cooling fins but I made a couple grinds with my Dremmel in the one fin and it now fits fine (yeah I know), but will get hot. I have pics but I'd be damned if I know how to upload pics on a computer of my cell phone. I got the recoil back together and gave it a few pulls. Ahh what a nice strong spark!! I can't remember but I think the kill switch cord was still off. Put things back together and got a bit of a work out trying to get it going a day later. Nothing so I pulled the plug and checked for spark again and nothing. All I did was let it sit a couple days in between spark and no spark. The spark was gone even bypassing the kill switch.
Got it down to the coil (which looked like it was not truly round by a few 1000's) and used my homemade flywheel puller which works like dream.
7. Ordered a new condenser
8. Have new points to install
9. Blew out the area and cleaned things up with compressed air. Flywheel looks ok (didn't spin on the crank) and the key and shaft look great.
10. Ordered along with the other goods a new flywheel for $30.00 (I hit the one flywheel key and damaged it a bit when I was trying to remove with a hammer first off before my puller). It prob could be repaired but the flywheel I have is not perfectly round. I'm gonna ask if the is a SP125 specific.
So I am waiting for parts and want to understand the whole "points" thing and how to properly R&R them. How to set up the points properly. Condenser seems pretty strait forward, flywheel? Key will align with the arrow @ TDC? Looks like the key and TDC point directly at the coil.
So this brings to where I am now. Waiting and trying to do some reading on the rest so I complete it properly. I have nothing but time and don't want to get it back together to find I missed something.
Oh yeah, there was a hardened silicone type material around the wire end connectors at the points. Where the coil wire and the condenser wires meet the coil. Little plastic shield, little plastic spacer and that glue. Kinda looked like old ultra copper. What does this stuff do and is it necessary?
Wow, fingers are tired, but any help would be greatly appreciated!!
Cheers.
Finally found time to open up my nice old SP 125. Been a while but it did fire after a tad of priming ... ran for about 2 minutes then she just died.
1. Changed plug
2. Checked compression .... 160. Kill switch wasn't off and throttle was not @ WOT. oops.
3. Fuel Filter ok, lines ok.
4. NO carb rebuild but when it ran for that short time it ran great. Idled, reved up and was responsive.
5. Pulled recoil cover and checked wires, all looked ok.
6. Pulled off kill switch wire from coil and pulled .... no spark
Ordered a coil and changed it out. The coil fit pretty tight against the head/cooling fins but I made a couple grinds with my Dremmel in the one fin and it now fits fine (yeah I know), but will get hot. I have pics but I'd be damned if I know how to upload pics on a computer of my cell phone. I got the recoil back together and gave it a few pulls. Ahh what a nice strong spark!! I can't remember but I think the kill switch cord was still off. Put things back together and got a bit of a work out trying to get it going a day later. Nothing so I pulled the plug and checked for spark again and nothing. All I did was let it sit a couple days in between spark and no spark. The spark was gone even bypassing the kill switch.
Got it down to the coil (which looked like it was not truly round by a few 1000's) and used my homemade flywheel puller which works like dream.
7. Ordered a new condenser
8. Have new points to install
9. Blew out the area and cleaned things up with compressed air. Flywheel looks ok (didn't spin on the crank) and the key and shaft look great.
10. Ordered along with the other goods a new flywheel for $30.00 (I hit the one flywheel key and damaged it a bit when I was trying to remove with a hammer first off before my puller). It prob could be repaired but the flywheel I have is not perfectly round. I'm gonna ask if the is a SP125 specific.
So I am waiting for parts and want to understand the whole "points" thing and how to properly R&R them. How to set up the points properly. Condenser seems pretty strait forward, flywheel? Key will align with the arrow @ TDC? Looks like the key and TDC point directly at the coil.
So this brings to where I am now. Waiting and trying to do some reading on the rest so I complete it properly. I have nothing but time and don't want to get it back together to find I missed something.
Oh yeah, there was a hardened silicone type material around the wire end connectors at the points. Where the coil wire and the condenser wires meet the coil. Little plastic shield, little plastic spacer and that glue. Kinda looked like old ultra copper. What does this stuff do and is it necessary?
Wow, fingers are tired, but any help would be greatly appreciated!!
Cheers.