Posts
88
Joined
11/8/2017
Location
Mesa, AZ
US
Edited Date/Time
11/23/2021 8:59pm
Just picked up this 1993 KX125 from my wife's brother. Plan is to restore it into a runner and give it to my wife's sister as a gift.
Seems to have a few good things going for it, already has the hard to find PC pipe and stinger silencer. PC worked on the suspension back in period (although looks to need a rebuild). Looks like a PC clutch perch. Seems to have relatively low hours overall.
Some concerns: My father in law seems to remember it was sleeved at some point in time, so may look into trying to find a new cylinder. Some oil on the stand, thinking shift shaft seal, countershaft seal, or separated oil coming out of carb (gas was left on when I got it, hasn't been touched in ~6 years)
Plan is new plastics, rebuild suspension, inspect/grease/replace all chassis bearings, rebuild calipers/master cylinders, rebuild carb, inspect cylinder.
Seems to have a few good things going for it, already has the hard to find PC pipe and stinger silencer. PC worked on the suspension back in period (although looks to need a rebuild). Looks like a PC clutch perch. Seems to have relatively low hours overall.
Some concerns: My father in law seems to remember it was sleeved at some point in time, so may look into trying to find a new cylinder. Some oil on the stand, thinking shift shaft seal, countershaft seal, or separated oil coming out of carb (gas was left on when I got it, hasn't been touched in ~6 years)
Plan is new plastics, rebuild suspension, inspect/grease/replace all chassis bearings, rebuild calipers/master cylinders, rebuild carb, inspect cylinder.
Teardown has gone pretty smoothly so far
I have found that there was a major sealing issue between the pipe and the silencer which has blown carbon all over the back of the cases, carb, air boot, shock, linkage, swingarm etc. On my RMs, there is a rubber seal between pipe and silencer, didn't have one on this bike. Is it missing or did these not come with those seals?
Also, any tips to get the carbon cleaned off the cases? pretty much everything is going to go in the parts washer, but trying to avoid splitting cases if I can.
Second problem, tab for the lower radiator mount on the left hand side of the bike has snapped off
Third problem, bolts holding the Works Connection frame guards on were pretty rusted, were able to crack 3 out of 4 loose, was struggling with the 4th and just thinking about adding some heat and penetrating oil when she rounded off on me. First time I have ever done that, so need to get to the store and buy and extractor.
Last thing, I have never seen a spark plug do this before.
https://www.vitalmx.com/forums/Bike-Builds,46/1993-KX-125,1368642
Make sure you check your frame over. My frame had a few cracks in it, this is why I'm rebuilding it again. I've learned a lot rebuilding it, if you need any help let me know.
The Shop
Finally had time to tear into this a little more, took the bottom end and the frame to Factory Edge for them to tear into and weld that radiator tab back on. https://www.facebook.com/factoryedgemotors/
They found that the inner clutch cover had been cracked and rewelded at some point and wasn't sealing very well. Worked out to be a bit cheaper to buy another cover off of ebay for a 93 instead of re-welding and machining. They also found that the crank bearing was on it's last leg so we are splitting cases and doing full vapor blast to do it right.
Having to split cases is going to cut into some of the cosmetic budget so for now we will keep plastics and just retrue wheels and do new bearings.
Got started on getting the surface rust off the pipe. Going to take a few passes and letting it soak in WD to start to loosen it. Feels like we had about 20 years of surface rust to start with.
Silencer cleaned up really well, was hoping to do packing too but don't have a rivet tool and don't have time before our planned thanksgiving family riding trip to have someone do it for me. Add it to the list for next season.
If you want it let me know and I’ll just give it to you!
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