Originally Posted by
bigmatt
can anyone tell me the difference in crank rod part#s?
21-0600
28-0600
same thing different#s? one says pro one does not. The pro stronger? I noticed it was cut different on the back side.
And wich one is the new gx series rod?
Hey Matt, there has been a lot of debate on the last few pages over these rods and associated cranks. I will give you the info I have, although others may disagree and tell you otherwise.
Part # 28-0600 is listed in the factory ordering lists as an RTR Con Rod. It was fitted to earlier model motors (Gen 4 and 5 I know for sure). According to measurements supplied it is not suitable for the Gen 5.5, GX motors with the slightly bigger crank pin diameter.
Part # 21-0600 is the newer rod (Pro). It is stronger and lighter and has a slightly different big end bushing size to better fit the Gen 5.5, GX Series and MG66 motors, with either the std 5.5 cranks or the newer TiNi coated cranks (GX & MG66).
Cheers
