K321 Custom Rebuild...

Brian Miller will do it for a price, so apparently it's possible.

http://gardentractorpullingtips.com/valvecam.htm

I looked at that site for about an hour last night, looking to see if it was offered. I must have been tired, because I just could not find it. I did find it now, thank you for making me go back and take another look.

SO,,, that brings up a question..??? How can I re-size my throttle shaft openning... is there a sleeve.?? My throttle shaft warbles at the intake and causes the throttle shaft to bounce around.......??

What carb are we talking about?

Michael, Brian Miller also mentions he can no longer get the smaller (1 1/8" ?) exhaust valve seat. Is that the issue you are having?

sodisr said:

SO,,, that brings up a question..??? How can I re-size my throttle shaft openning... is there a sleeve.?? My throttle shaft warbles at the intake and causes the throttle shaft to bounce around.......??

Click to expand...

There are bronze bushings that people use on the throttle shaft. Drill out the body of the carb and press in the insert. I will see if I can find it.

http://gardentractorpullingtips.com/carbfuel.htm#throttleshaftbushings

Note: for anyone who rebuilds Kohler K series engines, Brian Miller's Pulling web site has a wealth of information not available in the Factory Manual. This site should be bookmarked.

Trav1s said:

There are bronze bushings that people use on the throttle shaft. Drill out the body of the carb and press in the insert. I will see if I can find it.

Click to expand...

I have the Zenith carb. I beleive it's a ,, model 1408

Another question, if I make this into a twin by mating both blocks and machining both cranks to mate up, is it possible for the original carb to feed both cylinders?

Theoretically yes. The problem with mating two motors is getting them to run exactly the same. The carb would have to be jetted and potentially ported to twice the size to run it.

I don't know if I will have the problem with running them the same. That is why I want to run it off one carb. I literally am going to bore the front crank out and then I am gonna to insert the PTO end of the back engine in the front crank and set screw it in. I am gonna keep both cams separate, but they should rotate together based on the gearing. I think pullers use one carb spinning well over 4000 RPM which would be like feeding this twin off one carb. I have thought about adding a fuel pump too.

Isn't there a two cyl. engine available that would save you having to reinvent this whole thing? I've seen a puller w/ a Suzuki Hayabusa engine that was killer.

LilysDad said:

Isn't there a two cyl. engine available that would save you having to reinvent this whole thing? I've seen a puller w/ a Suzuki Hayabusa engine that was killer.

Click to expand...

I have been looking and not having that much luck. I wish I could find one. Does anyone have any suggestions? I would really like it to be an inline twin and around 18 hp to 30 hp and not a budget killer. Would like to keep it at 3600 RPM, too. On a side note, I do have a Wisconsin THD that is sitting around that could go in there, but it is in pretty sad shape.

michael.kitko said:

I have been looking and not having that much luck. I wish I could find one. Does anyone have any suggestions? I would really like it to be an inline twin and around 18 hp to 30 hp and not a budget killer. Would like to keep it at 3600 RPM, too. On a side note, I do have a Wisconsin THD that is sitting around that could go in there, but it is in pretty sad shape.

Click to expand...

I would go with the THD. The money you spend on the homebuilt would rebuild the Wisc. I'm not trying to be a kill joy, but I'm afraid after you get the dual Kohler together, you will spend a lot of time trying to get it to run right. Now, if you were to belt two engines inline, that might be doable.