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Kx125 project

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Looking into buying a 1992 kx125. It does not have crank seals and will need new crank bearings. Any red flags to look out for or any words of wisdom?

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If it needs seals/ bearings on the bottom end, definitely replace/rebuild the crankshaft. If you have the OEM crank from that motor I’d suggest getting rebuilt by a reputable shop. Or buy OEM.( pricey) 
there are full rebuild kits out there but be forewarned most , if not all , are cheap Chinese crap. I only trust OEM or rebuilt OEM. I use Ken O’Connor Racing for mine. There are others I’m sure but Ken is a crank specialist. He can also give you the best options for rods, pistons, and cylinder work. I know of kits being installed (Wiesco, Hot-Rods) and only last a few hours.... that would suck. Do it right the first time. Take pride in your older 2 stroke and take the extra time/ money and have an awesome bike to ride. 

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Ok first off a bike like that will have some major issues to address.  its almost 3o years old.  Put aside 2K to get it all sorted. 

-full engine rebuild.  May need not only crank, bearings, seals, but also cylinder, power valves, possible gears, im sure a clutch basket and inner hub. 

-suspension, kawi's have small lower shock bearings in the linkage.  Most will need to have the linkage sleeved if you cannot find a good one, then new bearings installed.   Im sure the shock and forks will need full rebuild.

-brakes, inspect those.  replace all the seals and brake lines

-wheels - probably hammered

-frame check for cracks

-normal stuff like shifter, chain/sprockets, bars, levers will probably need to be replaced.  plastic will be harder to find. 

Good luck on the bike!  they can be a lot of fun.  just dont expect cheap. 

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21 hours ago, Luke Hampton said:

Looking into buying a 1992 kx125. It does not have crank seals and will need new crank bearings. Any red flags to look out for or any words of wisdom?

If it's your 1st bike, look for something else that's already in running condition, allowing you to spend more time riding than wrenching.

Initially more expensive but in the end it will probably be cheaper than sorting out a 30 year old MX race bike that's in pieces as JJ explained above.

 

Parts availability is already an issue for bikes much newer than that and unless you know what you are getting into

(some mechanical experience with dirt bikes), project bikes like this often end up in a money pit nightmare.

 

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21 hours ago, Luke Hampton said:

Looking into buying a 1992 kx125. It does not have crank seals and will need new crank bearings. Any red flags to look out for or any words of wisdom?

In simple laymans terms, yes, the whole bike. No parts-no dice. Find a complete running scoot and by pass that one. Unless you are a bike restorer, you will spend many many years finding parts for it, and waiting or back ordered stuff, and I don't know bout u but I hate waiting for parts....

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This bike has already been almost completely rebuilt. New suspension, new rims and tires, new plastics, exhaust, and top end. I am planning on having the bottom end rebuilt professionally. 

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5 hours ago, Luke Hampton said:

This bike has already been almost completely rebuilt. New suspension, new rims and tires, new plastics, exhaust, and top end. I am planning on having the bottom end rebuilt professionally. 

there is your red flag - if the bike is as nice as you say, would be cheaper to install new top and bottom end kit and get more $ out of it

There is a reason someone is selling the bike.  Could be do to a part that is NLA as mentioned, or just the amount of coin its going to take to get it running.  Just remember buying used, you are inheriting someone else's problems/issues/shortcuts/bandaid fixes.  It all adds up to sort it out. 

 

 

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I own a 92 that I rebuilt. I highly recommend getting something newer unless you're into the vintage mx scene... it's a real hassle to find parts for, both for the engine and suspension. If you do end up buying it makes sure you replace the connecting rod with a hot rods one, the oem ones are known to shatter.

IMG_20190516_193142.jpg.46d6377ca2de7d0c6ca58ad545d18755.jpg

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