K&B .67 and .82 questions

[dannyual767]

I bought these engines from ebay. The .67 is brand new and the .82 is used (seems the piston and sleeve are kinda used up :angry: .) Anyway, I disassembled both of them and I've got a couple of questions concerning the con rods.

1. In the .67, the con rod is beefy, boxy and massive like in my OPS .65 and .67. In the K&B .82., the connecting rod is round and looks like a dogbone. It's very spindly looking . I can't see how this thin thing can take much stress. Is this the right connecting rod or did the seller put in a bogus con rod? BTW, the engine is super clean but the sleeve almost looks chromed :angry: .

2. I forgot to look at the way the .67 con rod was installed before I disassembled it. It has one oil hole. Do I face the oil hole toward the crankshaft or toward the rotor? I would've thought toward the rotor since that is where the fuel charge is coming in however, there seems to be a chamfer on the connecting rod bushing on the oil hole side that leads me to believe that it should go against the crank.

Thanks, everyone!

 

[dannyual767]

I just went to the K&B website and looked up the parts list for the .67 and .82. It calls for the same connecting rod :unsure: . My two conrods are as different as night and day! Anybody own a K&B .82?

 

[Propwash]

:blink: Hello Dannyual : The round con rod is the last style K&B produced before they sole out to the present owners . The beefy con rod is the more desired one to have . Aeromarine use to make a rod which was very close to the RPM rods , the bushing wouldn't migrate . The K&B rods had a tendency to let go because the bottom bushing would slip and cover off the oil holes . This can be corected by having the bushing pinned . Also the chamfer does face the crank , this is to match the radius where the crank pin extends out from the crank hub . The older moters had a seperate pressed in pin and the newer ones were machined from one piece . If you don't put the chamfer towards the crank , the bushing will grab under load and spin the bushing , thus closing off the oil holes and then the eng goes KABOOM . Hope this helps .

 

[dannyual767]

Propwash thanks for your post. Now I can rest a little easier knowing that I don't have some bogus junk in my engine.

Why would K&B have gone to these skinny little vintage engine looking conrods :angry: ? Maybe I should try to get another rod for it.

I did install my .67 conrod with the hole facing the crank. The oil hole made me think to face it toward the rotor but that chamfer had crankside written all over it!