Jump to content

Nominations for Tractor of the Month
Garden Tractors and Parts on eBay



Photo
- - - - -

Kohler 301, 12 Hp Rebuild Questions


  • Please log in to reply
2 replies to this topic

#1 justwalt OFFLINE  

justwalt

    Tractorholic

  • Senior Member
  • -GTt Supporter-
  • Member No: 1318
  • 4 Thanks
  • 112 posts
  • Location: honesdale pa

Posted April 09, 2012 - 11:57 PM

Flea markets are great... got this stuck 1970 engine for $25

I want to do a few mild mods to this engine, keeping it below 4000 RPM.

The bore, (now honed), is 3.380", (standard is 3.375")

Questions...

Will a new standard piston and ring set be too loose... or should I just bore it out to
the .010 over size and get the matching piston and rings?

Should I go for the 18 HP cam, which is supposed to have a bit more duration?

I need new valves, followers and the seats ground anyway... should I stick with the
standard size, or go bigger, with a little chamber re-shaping and light porting?

And I will use a 3" intake extension under the carb.

(Any better carbs???)

I think all of the above mods, (combined), is enough, and will complement eachother.

Also, I want to go with a stator and 9-1/2" flywheel for ignition...
(with the ring gear, so I can put the newer starter on it too.)

I know I have to change the shroud, but my bearing plate looks like it'll fit the larger
flywheel... it has the half circle cut out for the starter gear...??

And then I'll mount this one on the B-10... I think... or my David Bradley walk-behind.

thanks in advance

Walt

Edited by justwalt, April 10, 2012 - 12:13 AM.


#2 chris m OFFLINE  

chris m

    Tractorholic

  • Super Moderator
  • Staff
  • -GTt Supporter-
  • Contributor
  • Member No: 8148
  • 3,277 Thanks
  • 4,033 posts
  • Location: Charlestown,Rhode Island

Posted April 10, 2012 - 01:01 AM

Ok 1st I would just leave standard if it is only .005 over stock (as long as it is round) All your mods sound good, but in order to see a difference you would have to do allot more mods. As far as the carb goes I personally like the Carter carbs (not a big Walbro fan) I'll find the link for Brian Miller it is on here somewhere, you will like his site. All kinds of tips and tricks for building a Kohler either stock or performance mods. http://gardentractor...s.com/index.htm

#3 justwalt OFFLINE  

justwalt

    Tractorholic

  • Senior Member
  • -GTt Supporter-
  • Member No: 1318
  • 4 Thanks
  • 112 posts
  • Location: honesdale pa

Posted April 10, 2012 - 08:08 PM

yeah, Miller's site is amazing, I've been through it once before and that's where I got the thoughts from... to just let
the motor breath a bit better and idle better.

and after re-reading his bit on the ignitions, I think I'll leave it with the original battery, points and starter/generator.




Top