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Big Daddy’s Fix-It Shop

Lawn Mower Repair Shop Mobile Alabama

Briggs and Stratton Starter Rope Size

Briggs and Stratton Starter Rope Size

You are probably going to need size #4 or size #5 rope. Five to eighteen horse power engines normally have 63 inches of cord. When possible measure length of cord that is being replaced and use replacement cord of same length. Use the same diameter cord also.

Rope size can be subjective. Personally, I use 3 or 3 1/2 on two stroke stuff, 4/4.5/5 on mid hp range engines and 6/7 on large hp applications. The rope number indicates the number or 32nds of an inch. For example #3.5 represents 3 32nds(6/64) + 1/2 of a 32nd(1/64) or a total of 7/64.

I have several rolls of Honda rope which are not close to the corresponding metric number in millimeters. On the other hand, I have a couple of rolls of Stihl rope, #3 and #3.5, which measure very close to 3mm and 3.5mm.

As long as the rope you are replacing is original to the equipment, a reasonably close rope size shouldn’t be a problem.

When you’re selecting the size of rope for your small engine, chainsaw, trimmer, push mower or riding mower, keep these in mind:

  • #3 (3/32″ Diameter) and #3-1/2 (7/64″ Diameter) rope is used on most trimmers and small 2-cycle engines
  • #4 (1/8″ Diameter) and #4-1/2 (9/64″ Diameter) rope is used on most chain saws and larger 2-cycle engines
  • #4-1/2 (9/64″ Diameter), #5 (5/32″ Diameter) and #5-1/2 (11/64″ Diameter) rope is used on most 4-cycle push mower small engines
  • #6 (3/16″ Diameter) and #7 (7/32″ Diameter) rope is used on most larger 4-cycle engines

For those of you that like to stuff your head full of useless information, here is a bunch of it.

Diameter Inch Diameter Millimeters
1/64″ 0.3969 mm
1/32″ 0.7938 mm
3/64″ 1.1096 mm
1/16″ 1.5875 mm
5/64″ 1.9844 mm
3/32″ 2.3813 mm
7/64″ 2.7781 mm
1/8″ 31750 mm
9/64″ 3.5719 mm
5/32″ 3.9688 mm
11/64″ 4.3656 mm
6/16″ 4.7625 mm
13/64″ 5.1594 mm
7/32″ 5.5563 mm
15/64″ 5.9531 mm
1/4″ 6.3500 mm
17/64″ 6.7469 mm
9/32″ 7.1438 mm
19/64″ 7.5406 mm
5/16″ 7.9375 mm
21/64″ 8.3344 mm
11/32″ 8.7313 mm
23/64″ 9.1281 mm
3/8″ 9.5250 mm