Aaroncake's website specifies that the OMP needs 4 washers:

2 11/16 x 1/16
2 1/4 x 1/16

Is the 11/16 and 1/4 specifying ID or OD?

Thanks in advance.

 

OK, Silly question anyways. I am going to assume ID. If I am wrong they are all of $5 a box, so it won't be a big deal.

 

junk the omp and just premix

 

The problem with that is the OMP is there for a reason. The 13B is meant to be run under a variable mixture. As high as about 50:1 gas to oil ratio under high RPM/open throttle and as low as negligible under low RPM/light throttle. So I think it's best if I kept the OMP working properly.

If I had the guts, I would certainly prefer to set up a separate OMP drawing from its own tank of 2 stroke oil. However, that's more than I would like to tackle now.