Larger case bushing for 1986 engine found
Posted: March 4th, 2013, 4:37 pm
So I wanted to get some larger bushing to fit the 17 mm pivot bolt of the AF.Honda doesn,t sell the bushing themselves but Yamaha is so I ordered some from a YZ250 2001 (17mm pivot bolt).
Part # 90387-1712Y-00
According to partzilla, these fit on:
1998 RACE KART - YZ125K-SK CRANKCASE-YZ125-SK
1998 RACE KART - YZ80K-SK CRANKCASE-YZ125-SK
1998 YZ125SK CRANKCASE-YZ125-SK
1998 YZ80SK CRANKCASE-YZ125-SK
1998 MOTOCROSS 4-STROKE - YZ400FK CRANKCASE
1998 WR400FK CRANKCASE
1998 YZ125 - YZ125K1 CRANKCASE
1998 YZ250 - YZ250K1 CRANKCASE
1999 COMPETITION - YZ250L1 CRANKCASE
1999 MOTOCROSS 4-STROKE - YZ400FL CRANKCASE
1999 WR400FL (DEEP PURPLISH BLUE SOLID E) CRANKCASE
1999 YZ125 - YZ125L1 CRANKCASE
2000 WR400F - WR400FM CRANKCASE
2000 YZ125 - YZ125M1 CRANKCASE
2000 YZ125M CRANKCASE
2000 YZ250 - YZ250M1 CRANKCASE
2000 YZ250M CRANKCASE
2000 YZ426F - YZ426FM CRANKCASE
2001 WR250F - WR250FN CRANKCASE
2001 WR426F - WR426FN CRANKCASE
2001 YZ125 - YZ125N1 CRANKCASE
2001 YZ250 - YZ250N1 CRANKCASE
2001 YZ250F - YZ250FN CRANKCASE
2001 YZ250N CRANKCASE
2001 YZ426 - YZ426FN CRANKCASE
So I got some measurement with my caliper (note that my 1986 bushing is not in very good condition and was bored to 17mm so I don't have original ID):
YZ250 2001 bushing: CR500 1986 bushing:
Lenght: 25.48mm ~25.70mm
Flange thickness 3mm 3.22mm
Flange OD 32.75mm ~31.60mm
Bushing OD 21.94mm 18.99mm
Bushing ID 17.14mm ~15mm
I was worry about the flange thickness before I received them but after I measured them, 0.22mm (~0.008") isn't gonna be a problem I think. And thinking of it, my 1986 bushing is a little ressed (is it from the factory?) and I didn't took it into account when I took my measurement, so they may be about the same then...
So only thing to do is to bore the case for the new larger bushing.
Part # 90387-1712Y-00
According to partzilla, these fit on:
1998 RACE KART - YZ125K-SK CRANKCASE-YZ125-SK
1998 RACE KART - YZ80K-SK CRANKCASE-YZ125-SK
1998 YZ125SK CRANKCASE-YZ125-SK
1998 YZ80SK CRANKCASE-YZ125-SK
1998 MOTOCROSS 4-STROKE - YZ400FK CRANKCASE
1998 WR400FK CRANKCASE
1998 YZ125 - YZ125K1 CRANKCASE
1998 YZ250 - YZ250K1 CRANKCASE
1999 COMPETITION - YZ250L1 CRANKCASE
1999 MOTOCROSS 4-STROKE - YZ400FL CRANKCASE
1999 WR400FL (DEEP PURPLISH BLUE SOLID E) CRANKCASE
1999 YZ125 - YZ125L1 CRANKCASE
2000 WR400F - WR400FM CRANKCASE
2000 YZ125 - YZ125M1 CRANKCASE
2000 YZ125M CRANKCASE
2000 YZ250 - YZ250M1 CRANKCASE
2000 YZ250M CRANKCASE
2000 YZ426F - YZ426FM CRANKCASE
2001 WR250F - WR250FN CRANKCASE
2001 WR426F - WR426FN CRANKCASE
2001 YZ125 - YZ125N1 CRANKCASE
2001 YZ250 - YZ250N1 CRANKCASE
2001 YZ250F - YZ250FN CRANKCASE
2001 YZ250N CRANKCASE
2001 YZ426 - YZ426FN CRANKCASE
So I got some measurement with my caliper (note that my 1986 bushing is not in very good condition and was bored to 17mm so I don't have original ID):
YZ250 2001 bushing: CR500 1986 bushing:
Lenght: 25.48mm ~25.70mm
Flange thickness 3mm 3.22mm
Flange OD 32.75mm ~31.60mm
Bushing OD 21.94mm 18.99mm
Bushing ID 17.14mm ~15mm
I was worry about the flange thickness before I received them but after I measured them, 0.22mm (~0.008") isn't gonna be a problem I think. And thinking of it, my 1986 bushing is a little ressed (is it from the factory?) and I didn't took it into account when I took my measurement, so they may be about the same then...
So only thing to do is to bore the case for the new larger bushing.