CMB .21 Rod

[Randy Rapedius]

A friend of mine has a CMB .21 Outboard. Someone told him that the top of the connecting rod is not bushed and it should be. Is this true?

Thanks in advance ...................... Randy

 

[Chris Wood]

hey randy

don't hold me to this, but when andy brown made the mac 21 i know the top of the rods, wasn't bushed.. and since they are made at the cmb factory when cmb made the 21 motor they did the same thing..

i know since that the mac now comes bushed so i would assume that the cmb does as well.. i have a buddy in the club that the mac rod is only bushed on the bottom..

needless to say he hasn't had any probloms yet?? but i think i would get a new rod.. aluminum and steel don't work well together...

hope i helped??

chris

 

[TimD]

Hi Randy,

Yes, you are correct in that the upper is not bushed on the green head Outboard powerhead. Early MAC 21's were the same as Chris said. I think Tim at Precision boats can fix them?

 

[Precision Boats]

Hey Guys,

Yes you are right no bush. on the rod at the top. I have fixed about 40 of these motors have seen up to .014 slop in the hole. Most have about .004-.007 when I get them. If not fixed the piston will hit the pto or button an cause big problems. I have also seen that, new sleeve,new rod,newpiston etc. $150.00 later your back up. Get them fixed thens it's a good motor.

Tim

PB Racing ;D