Quote:
by murphycc
Quote:
Originally Posted by Merk
I would replace the pistons and rings by the looks of the piston in the picture. The upper left top/edge is burnt and the piston skirt has marks on it. If the piston is shows wear the cylinder will have wear too. One of your ealier post make comments about fingernail getting caught on a scratch in one of the jugs. That tells me it is time for bore-oversize piston and rings. Reusing used pistons are a waste of time and good money in my book. I've had motors show up at my place with low power and high oil usage because they thought they would save a few dollars by reusing old pistons or using a die grinder trick.
The majority of the time you will have taper in the cylinder wall if you measure it like Kohler wants you to measure it. A good motor rebuilder will measure it like Kolher recomends. I use a good motor machine shop to bore, hone and remove ridge at the top of the cylinder. They have the correct equipment and experence to do the job the right way.
Yes the way I do it cost more money in the beginning. My way will make more power and last longer.
Going back to his delimma-
Just rering for a couple of bucks or bore and new pistons for my guess...$300++. The real question is how long the rods and governor will last. Life will really suck if after all this effort and $$$ if after an hour of use he throws a rod and takes out a jug or he loses the governor and the whole motor.
So, is it $600 or $300 or $50.
Just another thought-
You are replacing a KT, the jugs should be the same as the M18, what condition are those in??????? Pistons?????????
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I forgot to add a few things when I rebuild a motor. Here is something I post in Engine Overhaul Kit topic:
Quote:
by Merk
Keep in mind the following pertains to my everyday/stock rebuild Kohler motors.
There is more to rebuilding-overhauling a motor than what this kit has in it. The following parts need replaced when rebuilding a Kohler motor:
piston
rings
connecting rod
governor-(if it is a plastic gear)
gaskets
crankshaft seals
new head bolts
Depending on how the parts look in the crankcase breather they may need replaced. I like to replace the crankcase breather filter when I rebuild a motor.
Odds are the valves will need ground or replaced and the valve guides will need replaced. The guides may be ok now....2 years later the guides will need replaced.....easier to replace now than 2 years from now.
I only use Kohler replacement piston(s) in my Kohler motors. The kit says the piston is top of the line....Kohler piston cost more and the quality is better.
I do not install a used connecting rod in a rebuilt motor. The material will weaken over time. The only connecting rod I will use in my Kohler is one made by Kohler. I had a few friends bring freshly rebuilt motors over because they had a knock in them. The Stens rod was the problem.
Best thing you can do is spend a few extra dollars on the good parts.
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The only Kohler motors that I've rebuilt are are single cylinder K series motors. There may be a few things that I missed when it comes to rebuilding a 2 cylinder motor that pertains only to a 2 cylinder motor. The corrct Kohler manual will tell me what to look for.