Queen's 1990 Kawasaki KX125 minimal rebuild

Wycked31
Posts
493
Joined
3/25/2014
Location
West Palm Beach, FL, USA
8/12/2026 8:13am
I guess I don't mind an engine rebuild I kind of expected it, but seeing this is a little bit of a gut punch. Cases are...

I guess I don't mind an engine rebuild I kind of expected it, but seeing this is a little bit of a gut punch. Cases are a little tricky to weld on especially when they have had oil and grease seep into the pores over the years

1000092174.jpg?VersionId=LrTuxoJFKjGhYZ23pFSt6X

Look up Mike Wier on FB. He does a great job repairing cases.

yak651
Posts
8880
Joined
8/26/2006
Location
Appleton, WI, USA
Fantasy
8/12/2026 12:02pm
Why does this feel like its turning into a maximum rebuild? 🙃 Drain plug gasket: GASKET,10.5X16X1 92065-058Crankcase right (outer) BEARING-BALL 92045-1209 (crank main)Crankcase right (outer) SEAL-OIL 92049-1301Crankcase...

Why does this feel like its turning into a maximum rebuild? 🙃

 

Drain plug gasket: GASKET,10.5X16X1 92065-058

Crankcase right (outer) BEARING-BALL 92045-1209 (crank main)
Crankcase right (outer) SEAL-OIL 92049-1301
Crankcase right (outer) BEARING-BALL,#6303C3 601B6303
Crankcase right (outer) BEARING-BALL 92045-1497 (small one)
Crankcase right (outer) BEARING-BALL 92045-1304 (small one)
Crankcase right (inner) BEARING-BALL,#6905 92045-036
Crankcase right (inner) BEARING-BALL,#6202C3 601B6202

Crankcase left (inner) BEARING-BALL 92045-1209 (crank main)
Crankcase left (outer) SEAL-OIL 92049-1300
Crankcase left (inner) BEARING-BALL,#6202C3 601B6202
Crankcase left (inner) BEARING-BALL 92045-1252 (held on by two retainers)
Crankcase left (outer) SEAL-OIL,SC25376 92050-013 (output shaft/countershaft sprocket seal)
Crankcase left (outer) SEAL-OIL,TB13225.5 92051-005 (shift shaft seal)

Powervalve governor rod o-ring: RING-O,14.5X1.5 92055-1399
Powervalve top double o-ring: RING-O 92055-1439
Powervalve top o-ring: O RING,15MM 670B2015
Powervalve governer rod from case, orign: SEAL-OIL,SDO8144 92049-1207

Water pump gasket: GASKET,PUMP COVER 11009-1936
Water pump elbow gasket: GASKET,ELBOW 11009-1935
Water pump outer bearing: BEARING-BALL 92045-1497
Water pump inner seal: SEAL-OIL,MHSD8X18X10J-1 92049-1366

Clutch cover arm seal: SEAL-OIL,AG0353-F0 92049-1262

Kickstart seal: SEAL-OIL,SB16244 92049-002

exhaust silencer baffle o-ring: RING-O,BAFFLE PIPE 92055-1461

transmission input shaft snap ring: RING-SNAP 92033-1231 (3 total)
transmission output shaft snap ring: RING-SNAP,20MM 92033-1258 (3 total)

countershaft output shaft: RING-O,17.5X1.5 92055-022

Keeping a spreadsheet of what you spend or prefer not to be reminded?

8/12/2026 12:53pm
Why does this feel like its turning into a maximum rebuild? 🙃 Drain plug gasket: GASKET,10.5X16X1 92065-058Crankcase right (outer) BEARING-BALL 92045-1209 (crank main)Crankcase right (outer) SEAL-OIL 92049-1301Crankcase...

Why does this feel like its turning into a maximum rebuild? 🙃

 

Drain plug gasket: GASKET,10.5X16X1 92065-058

Crankcase right (outer) BEARING-BALL 92045-1209 (crank main)
Crankcase right (outer) SEAL-OIL 92049-1301
Crankcase right (outer) BEARING-BALL,#6303C3 601B6303
Crankcase right (outer) BEARING-BALL 92045-1497 (small one)
Crankcase right (outer) BEARING-BALL 92045-1304 (small one)
Crankcase right (inner) BEARING-BALL,#6905 92045-036
Crankcase right (inner) BEARING-BALL,#6202C3 601B6202

Crankcase left (inner) BEARING-BALL 92045-1209 (crank main)
Crankcase left (outer) SEAL-OIL 92049-1300
Crankcase left (inner) BEARING-BALL,#6202C3 601B6202
Crankcase left (inner) BEARING-BALL 92045-1252 (held on by two retainers)
Crankcase left (outer) SEAL-OIL,SC25376 92050-013 (output shaft/countershaft sprocket seal)
Crankcase left (outer) SEAL-OIL,TB13225.5 92051-005 (shift shaft seal)

Powervalve governor rod o-ring: RING-O,14.5X1.5 92055-1399
Powervalve top double o-ring: RING-O 92055-1439
Powervalve top o-ring: O RING,15MM 670B2015
Powervalve governer rod from case, orign: SEAL-OIL,SDO8144 92049-1207

Water pump gasket: GASKET,PUMP COVER 11009-1936
Water pump elbow gasket: GASKET,ELBOW 11009-1935
Water pump outer bearing: BEARING-BALL 92045-1497
Water pump inner seal: SEAL-OIL,MHSD8X18X10J-1 92049-1366

Clutch cover arm seal: SEAL-OIL,AG0353-F0 92049-1262

Kickstart seal: SEAL-OIL,SB16244 92049-002

exhaust silencer baffle o-ring: RING-O,BAFFLE PIPE 92055-1461

transmission input shaft snap ring: RING-SNAP 92033-1231 (3 total)
transmission output shaft snap ring: RING-SNAP,20MM 92033-1258 (3 total)

countershaft output shaft: RING-O,17.5X1.5 92055-022

yak651 wrote:

Keeping a spreadsheet of what you spend or prefer not to be reminded?

Yes, I will keep up with expenses.  As of now I am projecting an investment of ~$3500-4000 to get this bike stable and reliable for the long term.  I'm dumb because as everyone knows we'll likely never see any return on that investment. 

The moment it goes on marketplace I'll get lowball offers of $1500 cash or would you trade for a geeetar or fo wheeler that needs some work 

why do we do this haha 

2
yak651
Posts
8880
Joined
8/26/2006
Location
Appleton, WI, USA
Fantasy
8/12/2026 7:10pm Edited Date/Time 8/12/2026 7:10pm
Why does this feel like its turning into a maximum rebuild? 🙃 Drain plug gasket: GASKET,10.5X16X1 92065-058Crankcase right (outer) BEARING-BALL 92045-1209 (crank main)Crankcase right (outer) SEAL-OIL 92049-1301Crankcase...

Why does this feel like its turning into a maximum rebuild? 🙃

 

Drain plug gasket: GASKET,10.5X16X1 92065-058

Crankcase right (outer) BEARING-BALL 92045-1209 (crank main)
Crankcase right (outer) SEAL-OIL 92049-1301
Crankcase right (outer) BEARING-BALL,#6303C3 601B6303
Crankcase right (outer) BEARING-BALL 92045-1497 (small one)
Crankcase right (outer) BEARING-BALL 92045-1304 (small one)
Crankcase right (inner) BEARING-BALL,#6905 92045-036
Crankcase right (inner) BEARING-BALL,#6202C3 601B6202

Crankcase left (inner) BEARING-BALL 92045-1209 (crank main)
Crankcase left (outer) SEAL-OIL 92049-1300
Crankcase left (inner) BEARING-BALL,#6202C3 601B6202
Crankcase left (inner) BEARING-BALL 92045-1252 (held on by two retainers)
Crankcase left (outer) SEAL-OIL,SC25376 92050-013 (output shaft/countershaft sprocket seal)
Crankcase left (outer) SEAL-OIL,TB13225.5 92051-005 (shift shaft seal)

Powervalve governor rod o-ring: RING-O,14.5X1.5 92055-1399
Powervalve top double o-ring: RING-O 92055-1439
Powervalve top o-ring: O RING,15MM 670B2015
Powervalve governer rod from case, orign: SEAL-OIL,SDO8144 92049-1207

Water pump gasket: GASKET,PUMP COVER 11009-1936
Water pump elbow gasket: GASKET,ELBOW 11009-1935
Water pump outer bearing: BEARING-BALL 92045-1497
Water pump inner seal: SEAL-OIL,MHSD8X18X10J-1 92049-1366

Clutch cover arm seal: SEAL-OIL,AG0353-F0 92049-1262

Kickstart seal: SEAL-OIL,SB16244 92049-002

exhaust silencer baffle o-ring: RING-O,BAFFLE PIPE 92055-1461

transmission input shaft snap ring: RING-SNAP 92033-1231 (3 total)
transmission output shaft snap ring: RING-SNAP,20MM 92033-1258 (3 total)

countershaft output shaft: RING-O,17.5X1.5 92055-022

yak651 wrote:

Keeping a spreadsheet of what you spend or prefer not to be reminded?

Yes, I will keep up with expenses.  As of now I am projecting an investment of ~$3500-4000 to get this bike stable and reliable for the...

Yes, I will keep up with expenses.  As of now I am projecting an investment of ~$3500-4000 to get this bike stable and reliable for the long term.  I'm dumb because as everyone knows we'll likely never see any return on that investment. 

The moment it goes on marketplace I'll get lowball offers of $1500 cash or would you trade for a geeetar or fo wheeler that needs some work 

why do we do this haha 

Plan to build this over winter but projecting at least $2k. Agree will never get money back but don’t plan to sell but keep as garage art. How do you decide to post project in bike build vs old school forum?IMG 5081 2.jpeg?VersionId=X wOaX2IswBYRwbMHFIr

1

The Shop

8/12/2026 7:13pm
yak651 wrote:

Keeping a spreadsheet of what you spend or prefer not to be reminded?

Yes, I will keep up with expenses.  As of now I am projecting an investment of ~$3500-4000 to get this bike stable and reliable for the...

Yes, I will keep up with expenses.  As of now I am projecting an investment of ~$3500-4000 to get this bike stable and reliable for the long term.  I'm dumb because as everyone knows we'll likely never see any return on that investment. 

The moment it goes on marketplace I'll get lowball offers of $1500 cash or would you trade for a geeetar or fo wheeler that needs some work 

why do we do this haha 

yak651 wrote:
Plan to build this over winter but projecting at least $2k. Agree will never get money back but don’t plan to sell but keep as garage...

Plan to build this over winter but projecting at least $2k. Agree will never get money back but don’t plan to sell but keep as garage art. How do you decide to post project in bike build vs old school forum?IMG 5081 2.jpeg?VersionId=X wOaX2IswBYRwbMHFIr

Bike builds is exactly what that is for. Old school Moto is in my mind for more discussing the old days like the old races and talking about the old bikes and such. I might have it backwards but that's how I look at it

2
Kidkawie
Posts
1191
Joined
8/31/2012
Location
ქუთაისი, GE
8/12/2026 11:07pm

Bug and tar remover works on glue, or just spray adhesive remover.

Problem with the 1990 forks is there are no parts, no spring options.  You could run a set of 95 forks, they have the mid valve, if you want to look more stock.  Double check axle diameters, there was a change early 90s iirc.

8/13/2026 12:55pm
Kidkawie wrote:
Bug and tar remover works on glue, or just spray adhesive remover.Problem with the 1990 forks is there are no parts, no spring options.  You could...

Bug and tar remover works on glue, or just spray adhesive remover.

Problem with the 1990 forks is there are no parts, no spring options.  You could run a set of 95 forks, they have the mid valve, if you want to look more stock.  Double check axle diameters, there was a change early 90s iirc.

I'm planning to run the 91-93 (not sure what year I have exactly) 43mm forks in place of the '90 41mm forks. 

That said I keep hearing that the '90 has no parts etc, but this came up with a quick search on ebay. 

https://www.ebay.com/itm/267256027986 

2026-08-13 15-52 1.png?VersionId=mAOy3uNZ9O4VUgD

 

2026-08-13 15-52
Brad460
Posts
4505
Joined
5/15/2012
Location
Richfield, WI, USA
Fantasy
8/13/2026 5:33pm Edited Date/Time 8/13/2026 5:33pm
Why does this feel like its turning into a maximum rebuild? 🙃 Drain plug gasket: GASKET,10.5X16X1 92065-058Crankcase right (outer) BEARING-BALL 92045-1209 (crank main)Crankcase right (outer) SEAL-OIL 92049-1301Crankcase...

Why does this feel like its turning into a maximum rebuild? 🙃

 

Drain plug gasket: GASKET,10.5X16X1 92065-058

Crankcase right (outer) BEARING-BALL 92045-1209 (crank main)
Crankcase right (outer) SEAL-OIL 92049-1301
Crankcase right (outer) BEARING-BALL,#6303C3 601B6303
Crankcase right (outer) BEARING-BALL 92045-1497 (small one)
Crankcase right (outer) BEARING-BALL 92045-1304 (small one)
Crankcase right (inner) BEARING-BALL,#6905 92045-036
Crankcase right (inner) BEARING-BALL,#6202C3 601B6202

Crankcase left (inner) BEARING-BALL 92045-1209 (crank main)
Crankcase left (outer) SEAL-OIL 92049-1300
Crankcase left (inner) BEARING-BALL,#6202C3 601B6202
Crankcase left (inner) BEARING-BALL 92045-1252 (held on by two retainers)
Crankcase left (outer) SEAL-OIL,SC25376 92050-013 (output shaft/countershaft sprocket seal)
Crankcase left (outer) SEAL-OIL,TB13225.5 92051-005 (shift shaft seal)

Powervalve governor rod o-ring: RING-O,14.5X1.5 92055-1399
Powervalve top double o-ring: RING-O 92055-1439
Powervalve top o-ring: O RING,15MM 670B2015
Powervalve governer rod from case, orign: SEAL-OIL,SDO8144 92049-1207

Water pump gasket: GASKET,PUMP COVER 11009-1936
Water pump elbow gasket: GASKET,ELBOW 11009-1935
Water pump outer bearing: BEARING-BALL 92045-1497
Water pump inner seal: SEAL-OIL,MHSD8X18X10J-1 92049-1366

Clutch cover arm seal: SEAL-OIL,AG0353-F0 92049-1262

Kickstart seal: SEAL-OIL,SB16244 92049-002

exhaust silencer baffle o-ring: RING-O,BAFFLE PIPE 92055-1461

transmission input shaft snap ring: RING-SNAP 92033-1231 (3 total)
transmission output shaft snap ring: RING-SNAP,20MM 92033-1258 (3 total)

countershaft output shaft: RING-O,17.5X1.5 92055-022

yak651 wrote:

Keeping a spreadsheet of what you spend or prefer not to be reminded?

Yes, I will keep up with expenses.  As of now I am projecting an investment of ~$3500-4000 to get this bike stable and reliable for the...

Yes, I will keep up with expenses.  As of now I am projecting an investment of ~$3500-4000 to get this bike stable and reliable for the long term.  I'm dumb because as everyone knows we'll likely never see any return on that investment. 

The moment it goes on marketplace I'll get lowball offers of $1500 cash or would you trade for a geeetar or fo wheeler that needs some work 

why do we do this haha 

Nice build! 

Also, I restored a 2000 CR125 and couple years ago..was easily $6000+ in parts..the money adds up fast when buying OEM parts, new wheels, tires, exhaust…so on and so on..

yak651
Posts
8880
Joined
8/26/2006
Location
Appleton, WI, USA
Fantasy
8/13/2026 6:19pm
yak651 wrote:

Keeping a spreadsheet of what you spend or prefer not to be reminded?

Yes, I will keep up with expenses.  As of now I am projecting an investment of ~$3500-4000 to get this bike stable and reliable for the...

Yes, I will keep up with expenses.  As of now I am projecting an investment of ~$3500-4000 to get this bike stable and reliable for the long term.  I'm dumb because as everyone knows we'll likely never see any return on that investment. 

The moment it goes on marketplace I'll get lowball offers of $1500 cash or would you trade for a geeetar or fo wheeler that needs some work 

why do we do this haha 

Brad460 wrote:
Nice build! Also, I restored a 2000 CR125 and couple years ago..was easily $6000+ in parts..the money adds up fast when buying OEM parts, new wheels, tires...

Nice build! 

Also, I restored a 2000 CR125 and couple years ago..was easily $6000+ in parts..the money adds up fast when buying OEM parts, new wheels, tires, exhaust…so on and so on..

Do you still have it or did you end up getting rid of it? Remember your build thread, you did a great job!

Kidkawie
Posts
1191
Joined
8/31/2012
Location
ქუთაისი, GE
8/14/2026 12:16am
I'm planning to run the 91-93 (not sure what year I have exactly) 43mm forks in place of the '90 41mm forks. That said I keep hearing...

I'm planning to run the 91-93 (not sure what year I have exactly) 43mm forks in place of the '90 41mm forks. 

That said I keep hearing that the '90 has no parts etc, but this came up with a quick search on ebay. 

https://www.ebay.com/itm/267256027986 

2026-08-13 15-52 1.png?VersionId=mAOy3uNZ9O4VUgD

 

2026-08-13 15-52

"parts" meaning spring options, valving, etc.  Last time I looked up on the 90 bikes you had to buy custom springs.

Look for cracks in the frame before you refinish it.

1 day ago
I'm planning to run the 91-93 (not sure what year I have exactly) 43mm forks in place of the '90 41mm forks. That said I keep hearing...

I'm planning to run the 91-93 (not sure what year I have exactly) 43mm forks in place of the '90 41mm forks. 

That said I keep hearing that the '90 has no parts etc, but this came up with a quick search on ebay. 

https://www.ebay.com/itm/267256027986 

2026-08-13 15-52 1.png?VersionId=mAOy3uNZ9O4VUgD

 

2026-08-13 15-52
Kidkawie wrote:
"parts" meaning spring options, valving, etc.  Last time I looked up on the 90 bikes you had to buy custom springs.Look for cracks in the frame...

"parts" meaning spring options, valving, etc.  Last time I looked up on the 90 bikes you had to buy custom springs.

Look for cracks in the frame before you refinish it.

I honestly did not plan on repainting the frame it looks like it was painted not too long ago in its life. I'm also going to try and just replace a few broken spokes and clean the wheels up as best I can. I cannot find replacement wheels for this bike anyway and that would add another $1,000 easy. Assuming I could find a set of wheels with silver rims and silver hubs.

That said do you happen to remember or no what frame modifications were made to 90 factory bikes back in the day?

1 day ago
yak651 wrote:

Keeping a spreadsheet of what you spend or prefer not to be reminded?

Yes, I will keep up with expenses.  As of now I am projecting an investment of ~$3500-4000 to get this bike stable and reliable for the...

Yes, I will keep up with expenses.  As of now I am projecting an investment of ~$3500-4000 to get this bike stable and reliable for the long term.  I'm dumb because as everyone knows we'll likely never see any return on that investment. 

The moment it goes on marketplace I'll get lowball offers of $1500 cash or would you trade for a geeetar or fo wheeler that needs some work 

why do we do this haha 

Brad460 wrote:
Nice build! Also, I restored a 2000 CR125 and couple years ago..was easily $6000+ in parts..the money adds up fast when buying OEM parts, new wheels, tires...

Nice build! 

Also, I restored a 2000 CR125 and couple years ago..was easily $6000+ in parts..the money adds up fast when buying OEM parts, new wheels, tires, exhaust…so on and so on..

If I'd been thinking straight last month I would have held on to my money spent $3,000 and got something that was already in rideable condition. 

I'm living the sunk cost fallacy right now I think 

profmur
Posts
177
Joined
3/13/2024
Location
Somewhere, NJ, USA
1 day ago

+1 for recommendation to consider stripping the frame. Given the condition of the rest of the bike, you might find some rot lurking? 

In my experience, projects never recoup the cost but we are really buying the experience and not an investment Smile

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