Engine Rebuilds?

[apex944]

Have a 1000 and 1650 which I see means I have a K241AQS and a K341AQS.
This winter I want to rebuild both. The 1000 has carb issues and the 1650 has carb/ignition/smoking issues. So over the winter I'd like to rebuild/re-tune both.

My question is what do I want to not miss on a rebuild on these?
I plan to do rings on both.

And on the flip side what normally is not required to replace? eg; I have read the crank bearing is usually good.

Any links to the best rebuild threads here would be helpful. My search came up with a LOT of articles but didn't see a specific AQS rebuild one.

Thanks !
- Bill

[cooperino]

Originally Posted by apex944

Have a 1000 and 1650 which I see means I have a K241AQS and a K341AQS.
This winter I want to rebuild both. The 1000 has carb issues and the 1650 has carb/ignition/smoking issues. So over the winter I'd like to rebuild/re-tune both.

My question is what do I want to not miss on a rebuild on these?
I plan to do rings on both.

And on the flip side what normally is not required to replace? eg; I have read the crank bearing is usually good.

Any links to the best rebuild threads here would be helpful. My search came up with a LOT of articles but didn't see a specific AQS rebuild one.

Thanks !
- Bill

You really need to find a good quality machine shop to bore,hone,polish etc etc. And be prepared to open your wallet.


If you want it done right replace the bearing for sure..

I just read this again.. are you talking about the outer bearing? or the journal bearing?

[apex944]

I'm usually rebuilding VW & Porsche engines so I have the shop and machinist covered. And the prices I've seen are nothing compared to a Porsche rebuild

[olds45512]

If you're not going to bore them for a bigger piston then just leave them alone. Putting new rings in a worn hole generally doesn't last.

[cooperino]

Originally Posted by apex944

I'm usually rebuilding VW & Porsche engines so I have the shop and machinist covered. And the prices I've seen are nothing compared to a Porsche rebuild

If you have the machining being given for free.. Then the rest is not all that much money. I was talking about machine shop prices.

[J-Mech]

Bore it
Grind the crank
Put in a new piston, rings and rod
New valves
Grind the seats
Replace guides as necessary
Check the governor gear, or replace it
Address any issues with the governor cross shaft
Shim the cam

If you aren't planning to bore or grind the crank, don't waste your time. I rebuild the K series and sell them. I know what it takes to rebuild them right.

[mickb72]

Why does everybody think there is a crank bearing? There is no bearing. Aluminum rod on steel crank. Unless you have one cut in the rod.BTDT Mike

[apex944]

Did not say "rod bearing".

Kohler 231625-S

[J-Mech]

Originally Posted by mickb72

Why does everybody think there is a crank bearing? There is no bearing. Aluminum rod on steel crank. Unless you have one cut in the rod.BTDT Mike

Because there is a crank bearing. Two of them.
There is no rod bearing.

[R Bedell]

IMHO.....if you are going to open up the engine, do it all and right, or leave it alone.