need year for light twin and cooling details

[papamendy]

Hi, recently was given a light twin which had been sent in for service/tune-up and then owner passed away several years ago. Engine cover a bit faded but inside was in mint condition. Started up with 32:1 to be on safe side. Engine started and ran great however im not familiar with the cooling system as there is no tell-tale spout for cooling water to exit. Serial # is as follows....
4306C C 83485 want to make sure cooling system is functioning and to see what year in case it needs new impeller or parts. All old tune up items were placed in a bag...points...plugs etc. Any info on this older great running motor would be greatly appreciated....thanks......Peter

 

[CATransplant]

Re: need year for light twin and cooling details

That's a 1973 model. I believe you can run it at 50:1, but you were probably smart to start with 32:1.

They're fine little motors.

You probably should replace the impeller, though. It's an easy job on that little eggbeater.

 

[papamendy]

Re: need year for light twin and cooling details

Thanks for the info on year. Is there anyway to tell if the cooling system is funtioning without chancing a meltdown. Is the impeller located in the area just under where the four bolts are to drop the lower unit? Are there shop manuals still available to your knowledge....thanks again....Peter

 

[Xcusme]

Re: need year for light twin and cooling details

Water pump sits on lower unit, remove 4 bolts, she drops down. Be sure to grease the upper drive shaft splines upon re-assembly. Your motor doesn't have a tell-tale per se. The 4 small holes in the rear of the lower exhaust housing will spit water when the pump is working. Shop manuals are still available from Ken Cook or Ebay.

 

[papamendy]

Re: need year for light twin and cooling details

thanks for the help.....Im sure its well worth having the shop manuel.