Major Problem

74saki · Oct 29, 2005

I recently picked up a 1974 Kasaki Ks 125, with only 1960 miles on it.The piston was supposed to be seized, but it was not. When I began to tear down the motor to see what exactly was going on I discoverd that the piston moved and was not stuck, but that something was blocking the crankshaft from rotating an entire revolution. When I took the cylinder jug offer I found that the lead weights that were used to balance the crank shaft had lodged itself between the connecting rod and the crank shaft. After I removed the obstruction I also noticed that there is quite alot of play on the connecting rod (up and down). I am wondering what I can do to solve this problem. I also would like to know where I could find parts for this bike. I have already purchased a 25 over piston and ring set.

Sorry for the long post

74saki · Oct 29, 2005

can anybody help?

Sawblade · Oct 30, 2005

Sounds like its time to have the crank rebuilt and the weights reattached. As for part, try that auction site by the bay or see what your local Kawasaki dealer can order or my have in stock.

Good luck with your project.

Gid · Oct 30, 2005

yep that play is your main crank bearing (connecting rod to bottom wrist pin) as for parts thersa few places just serch the web but one that is handy is bikebandit . com

74saki · Oct 30, 2005

I gonna stop by my kawasaki dealership monday and see what they say about the crank and reattaching the weights. I guess its not to bad for only paying $30 for the complete bike

JasonJ · Nov 1, 2005

BEWARE OF OLD BIKES WITH LOW MILAGE. There is a reason. I am always suspect of old bikes that look great with low milage that dont run. The reason is usally the same. They are lemons for one reason or another. Any bike older than 1980 with less than 2k Miles, dirt or street that is not running should be left to be. Getting dealer parts will be hard unless the bike shares parts with a long lived line. Ie Yamaha RD, LC, 2 strokes. Most lemons dont. getting the crank balanced with a new pistion will be hard. Maybe weigh the weights and the old piston parts against the new to see what the differance is. These parts are dynamicly balanced so even a static balance is just a ball park stab.
Basicly, you may not need the weights if they are fairly light, the new lighter piston may be ok and you can use bearings and rods from a newer application.
Maybe?
Or maybe take your $30 bike, part it out on the site by the bay????

74saki · Nov 1, 2005

JasonJ said:
BEWARE OF OLD BIKES WITH LOW MILAGE. There is a reason. I am always suspect of old bikes that look great with low milage that dont run. The reason is usally the same. They are lemons for one reason or another. Any bike older than 1980 with less than 2k Miles, dirt or street that is not running should be left to be. Getting dealer parts will be hard unless the bike shares parts with a long lived line. Ie Yamaha RD, LC, 2 strokes. Most lemons dont. getting the crank balanced with a new pistion will be hard. Maybe weigh the weights and the old piston parts against the new to see what the differance is. These parts are dynamicly balanced so even a static balance is just a ball park stab.
Basicly, you may not need the weights if they are fairly light, the new lighter piston may be ok and you can use bearings and rods from a newer application.
Maybe?
Or maybe take your $30 bike, part it out on the site by the bay????

In the next couple of weeks I am going to tear down the entire motor, split the cases and see what exactly is going on.

Sawblade · Nov 1, 2005

74saki said:
In the next couple of weeks I am going to tear down the entire motor, split the cases and see what exactly is going on.

Keep us posted on the out come!

74saki · Nov 2, 2005

ok will do

74saki · Nov 2, 2005

Some one Please Help

Ok I bought a 1974 Kawasaki KS 125A, and am looking to rebuild the motor. I am looking for parts on the site by the bay, and would like to know if my bike is an F6 or an F7? or just a KS125?

-Thanks

Major Problem

74saki

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Sawblade

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Gid

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JasonJ

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Sawblade

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74saki

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