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Yamaha YZ125 1994 - 2001 | Complete Engine Build Step by Step
#2stroke #yz125 #yamaha
Hey guys, Merry Christmas! This is the 1998 YZ125 engine I got in bins (literally.) I decided to restore it and turn it into a mild 144 big bore and it became the heart of the Grape Ape build! What bike should I build next?
CHAPTERS
0:00 - Intro
CENTER CASES
2:08 - Crank Installation
5:00 - Transmission Installation
5:45 - Shift Forks and Shift Drum
7:09 - Assembling Case Halves
STATOR SIDE
12:29 - Stator Installation/ Timing Adjustment
13:24 - Flywheel Installation
14:50 - Stator Cover Installation
15:40 - Sprocket Assembly Installation
16:35 - Case Saver Installation
CLUTCH SIDE
16:55 - External Shift Mechanism Assembly
19:16 - Shift Shaft Installation
19:50 - Kickstarter Assembly
21:32 - Kickstarter Shaft Installation
22:35 - Idler Gear Installation
23:45 - Primary Drive Gear Installation
24:53 - Clutch Assembly Installation
26:35 - Tightening Primary Drive Gear
27:07 - Clutch Pack Installation
28:48 - Pressure Plate and Springs
29:52 - Exhaust Governor and Actuation Arm
30:50 - Water Pump Gear Installation
31:15 - Right Crankcase Cover Installation
32:06 - Clutch Cover Installation
33:37 - Water Pump Impeller
33:56 - Water Pump Cover Installation
TOP END
34:19 - Ring Installation
35:27 - Piston Installation
37:04 - Athena Cylinder Explained
39:13 - Power Valve Installation
42:59 - Athena Base Gaskets Explained
43:49 - Cylinder Installation
45:30 - Power Valve Arm Assembly
46:00 - Power Valve Covers Installation
47:25 - Cylinder Head Installation
48:45 - Reed Installation
SHOWCASE/CLOSING
49:10 - Showcasing the Engine
49:54 - Running/Revving the Engine
51:13 - Closing
PARTS AND TOOLS IN THIS VIDEO - (These links may be affiliate links that I get a kick back for; there is no added cost to you)
Service Manual - bit.ly/3JgcY7y
Maxima Assembly Lube - bit.ly/3mySX2x
Yamaha Assembly Lube - bit.ly/3syeagW
Crank Installer - bit.ly/3qmaYSz
Anti-Seize - amzn.to/3qi8PJj
Stainless Bolt Kit - ebay.us/spKmlI
T-Handle Allen Set - bit.ly/3HbMeU4
Dead Blow - amzn.to/33LGcee
Topar Stator Cover (05-21) - ebay.us/25MiNE
Stator Cover Alternative (Boyesen) - ebay.us/gpYxeL
Moose Case Saver - ebay.us/2eeRpr
Aftermarket Kick Shaft - bit.ly/3Esm5yz
Clutch Kit - bit.ly/2YsRWjz
Blue Loctite - bit.ly/3ErR916
Red Loctite - bit.ly/3FrCMLD
Loctite 272 - ebay.us/dCh44V
Benol - bit.ly/3JgJExT
Tusk Air Filter - bit.ly/3o60B4r
VForce3 Reeds - bit.ly/31BODHX
144 Big Bore Kit - bit.ly/3khyjml
M12 Impact Driver - amzn.to/308yXvz
Torque Wrench - bit.ly/3qhCORC
COMPANIES I TRUST
Rocky Mountain ATV MC - bit.ly/3AkRaSS
Lion Parts - bit.ly/3jtEGSr
Rocket Ron - rocketronracing.com
BPRacing - bpracingatv.com
Obor Tires - shop.obor-tires.com/
MERCH - michael-sabo.creator-spring.com/
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