OzVMX Forum

Marketplace => eBay Finds => Topic started by: over the bars on December 23, 2010, 08:05:28 pm

Title: 79 Water Cooled YZ 125 F Kit .
Post by: over the bars on December 23, 2010, 08:05:28 pm

 Check this out. Im not sure what the water pump runs off ?   Maybe battery driven ?  .  ?   ???

  http://cgi.ebay.com/ebaymotors/Yamaha-79-YZ125F-WATERCOOLED-KIT-Vintage-MX-MotoCross-_W0QQcmdZViewItemQQhashZitem3cb1c5ed6bQQitemZ260680576363QQptZMotorcyclesQ5fPartsQ5fAccessories

Title: Re: 79 Water Cooled YZ 125 F Kit .
Post by: oldfart on December 23, 2010, 08:33:48 pm

Thermo syphon ..... very much the same way a solar collector works.  Barrel water heats up and rises to radiator which is air cooled , thus you have a natural convection loop.

Frosty, am I correct ;)

Title: Re: 79 Water Cooled YZ 125 F Kit .
Post by: oldfart on December 23, 2010, 08:40:42 pm

Just about had it right  ;D  go to contents and click on     simple thermosiphon.
 http://en.wikipedia.org/wiki/Thermosiphon

Title: Re: 79 Water Cooled YZ 125 F Kit .
Post by: monaro308 on December 23, 2010, 09:04:16 pm

If i remember correctly US Dirt bike mag ran a story and test on something like that when the YZ J  was released.
I think there was another on a welded up finned barrel on a YZ465 or 250.....i'd have to hunt my old mags.

Title: Re: 79 Water Cooled YZ 125 F Kit .
Post by: over the bars on December 23, 2010, 09:37:02 pm

  Thanks fellas, I should have paid attention in science class instead of drawing moto x or that should be scramble bikes on the back cover of my exercise book.   ;)

Title: Re: 79 Water Cooled YZ 125 F Kit .
Post by: TT5 Matt on December 24, 2010, 10:40:07 am

it's still got a aircooled head which has less fins/surface area than the std head,why bother at that price?

Title: Re: 79 Water Cooled YZ 125 F Kit .
Post by: Lozza on December 24, 2010, 01:03:55 pm

Could buy a water cooled engine or $1500 buys a welder and a lot of aluminium