Fallout from repairing two CS590 for a landscaper:
The pair were scored and low compression but only two years old. 50:1 and carb limiters did them in.
I cleaned up the cylinders with a brake cylinder hone but they were scratched and shabby at best.[emoji21]
Piston/cylinder kits were too expensive to warrant the venture. [emoji90] $170.
I noticed right away the the 620 used a two ring piston so that is what we tried on the first victim.
I figured the second ring would help compression leakage past the top one given the multiple scratch’s in the cylinder wall.
It did. After a half tank at a brisk idle the first one pumped 140. [emoji106]
Same treatment of powerhead #2 gave the same result. [emoji108]
OTOH: The chain brake on them is some flimsy.[emoji2960]
The pair were scored and low compression but only two years old. 50:1 and carb limiters did them in.
I cleaned up the cylinders with a brake cylinder hone but they were scratched and shabby at best.[emoji21]
Piston/cylinder kits were too expensive to warrant the venture. [emoji90] $170.
I noticed right away the the 620 used a two ring piston so that is what we tried on the first victim.
I figured the second ring would help compression leakage past the top one given the multiple scratch’s in the cylinder wall.
It did. After a half tank at a brisk idle the first one pumped 140. [emoji106]
Same treatment of powerhead #2 gave the same result. [emoji108]
OTOH: The chain brake on them is some flimsy.[emoji2960]