Lower end job on 2000 yz426. A few basic Q's.....

[Guest BrandonV]

Dont worry as I'm not going to ask what special tools I need. What I would like to know is about the bearings and tranny.

-Besides the crank bearings what others should I consider replacing?

-Buy OEM or is there a better alternative?

-My bike has always shifted positively and never jumped gear, but should I consider doing any preventative maintenence in the trans?

-Anything I should really consider replacing that I'm missing?

I'd like to have all needed parts prior to starting this job, is there anything besides bearings and seals (inc. waterpump seal) that I'll need? I did search and have been reading posts for the last few hours, but cannot get specific answers to these questions.

Thanks.

**Edit: how about the many circlips and o-rings the manual reccomds replacing? Is there a real need to replace these if they are in good shape?

[grayracer513]

1-Besides the crank bearings what others should I consider replacing?

2-Buy OEM or is there a better alternative?

3-My bike has always shifted positively and never jumped gear, but should I consider doing any preventative maintenence in the trans?

4-how about the many circlips and o-rings the manual reccomds replacing? Is there a real need to replace these if they are in good shape?

1-Check them all over, and replace the ones that show signs of needing it. I'd say you should plan to replace the four main trans bearings, since they require case splitting to get them out.

2-You can do better than OEM, but it's probably not necessary, and it could be a hassle and cost a lot. Find a bearing wholesaler in your area and see what he has in the sizes you need. You would want to know the ABEC number of what you have now (ABEC 3 would be my guess). Higher numbers indicate tighter mfg tolerances, but to repeat, they're so tight on the OEM bearings there's probably no point.

3-Look your shift forks over. They should show wear only at the points of the 'C' shaped part where they contact the gear. Wear at the center of the 'C', especially only on one side indicates a problem with fork wear or alignment. Check the trans gears for undue rounding of the locking dogs that engage the gears. This will lead to it jumping out of gear later on.

4-The standard mechanic's service manual correct practice way of doing things is that you always throw away every snap-ring and replace it. The truth in practice is different. Never reuse piston circlips (I swear, I never have ). Other than that check them carefully, consider the job they're doing, and use your own judgement. I have seen them fail.

I'd like to have all needed parts prior to starting this job,

I had the same dream once. It was great. There I was surrounded by every part I would need, all my tools were where I thought they were, Jennifer Connelly had just brought me a fresh beer. But then I woke up. ?

[Rick_Graham]

I'm doing the same thing. Heres my list:

This was from www.mrcycles.com

I have since found OEM parts cheaper at www.crotchrocket.com

PRODUCT INFORMATION:

Mfg Product Number: 93306-20532-00

Description: BEARING for 2000 YAMAHA YZ 426F

Order Quantity: 1

Unit Price: $15.35

Total Cost: $15.35

Mfg Product Number: 93440-25084-00

Description: CIRCLIP,OUTER for 2000 YAMAHA YZ 426F

Order Quantity: 3

Unit Price: $3.86

Total Cost: $11.58

Mfg Product Number: 5BE-17141-20-00

Description: GEAR, 4TH PINION for 2000 YAMAHA YZ 426F

Order Quantity: 1

Unit Price: $29.64

Total Cost: $29.64

Mfg Product Number: 5JG-17121-00-00

Description: GEAR, 2ND PINION for 2000 YAMAHA YZ 426F

Order Quantity: 1

Unit Price: $20.91

Total Cost: $20.91

Mfg Product Number: 93306-00431-00

Description: BEARING for 2000 YAMAHA YZ 426F

Order Quantity: 1

Unit Price: $14.83

Total Cost: $14.83

Mfg Product Number: 93306-00423-00

Description: BEARING for 2000 YAMAHA YZ 426F

Order Quantity: 1

Unit Price: $9.89

Total Cost: $9.89

Mfg Product Number: 93440-25084-00

Description: CIRCLIP,OUTER for 2000 YAMAHA YZ 426F

Order Quantity: 1

Unit Price: $3.86

Total Cost: $3.86

Mfg Product Number: 5BE-17231-00-00

Description: GEAR, 3RD WHEEL for 2000 YAMAHA YZ 426F

Order Quantity: 1

Unit Price: $30.07

Total Cost: $30.07

Mfg Product Number: 93440-28062-00

Description: CIRCLIP,OUTER for 2000 YAMAHA YZ 426F

Order Quantity: 1

Unit Price: $2.76

Total Cost: $2.76

Mfg Product Number: 5JG-17221-00-00

Description: GEAR, 2ND WHEEL for 2000 YAMAHA YZ 426F

Order Quantity: 1

Unit Price: $35.59

Total Cost: $35.59

Mfg Product Number: 93306-20593-00

Description: BEARING for 2000 YAMAHA YZ 426F

Order Quantity: 1

Unit Price: $22.47

Total Cost: $22.47

Mfg Product Number: 93102-32480-00

Description: OIL SEAL for 2000 YAMAHA YZ 426F

Order Quantity: 1

Unit Price: $5.03

Total Cost: $5.03

Mfg Product Number: 93210-22298-00

Description: O-RING for 2000 YAMAHA YZ 426F

Order Quantity: 1

Unit Price: $4.08

Total Cost: $4.08

Mfg Product Number: 90215-21001-00

Description: WASHER, LOCK for 2000 YAMAHA YZ 426F

Order Quantity: 1

Unit Price: $2.68

Total Cost: $2.68

Mfg Product Number: 5JG-11400-00-00

Description: CRANKSHAFT ASSY for 2000 YAMAHA YZ 426F

Order Quantity: 1

Unit Price: $263.45

Total Cost: $263.45

Mfg Product Number: 93306-30633-00

Description: BEARING for 2000 YAMAHA YZ 426F

Order Quantity: 2

Unit Price: $28.69

Total Cost: $57.38

Mfg Product Number: 5BE-11536-00-00

Description: GEAR, DRIVE for 2000 YAMAHA YZ 426F

Order Quantity: 1

Unit Price: $34.73

Total Cost: $34.73

Mfg Product Number: 90282-05058-00

Description: KEY,STRAIGHT for 2000 YAMAHA YZ 426F

Order Quantity: 1

Unit Price: $0.96

Total Cost: $0.96

Mfg Product Number: 93306-20335-00

Description: BEARING for 2000 YAMAHA YZ 426F

Order Quantity: 1

Unit Price: $9.89

Total Cost: $9.89

Mfg Product Number: 93311-62574-00

Description: BEARING, CYL.(3YL) for 2000 YAMAHA YZ 426F

Order Quantity: 1

Unit Price: $19.79

Total Cost: $19.79

Mfg Product Number: 90215-14204-00

Description: WASHER,LOCK for 2000 YAMAHA YZ 426F

Order Quantity: 1

Unit Price: $2.30

Total Cost: $2.30

Mfg Product Number: 90280-03017-00

Description: KEY,WOODRUFF for 2000 YAMAHA YZ 426F

Order Quantity: 1

Unit Price: $0.78

Total Cost: $0.78

Mfg Product Number: 94591-50120-00

Description: CHAIN for 2000 YAMAHA YZ 426F

Order Quantity: 1

Unit Price: $29.14

Total Cost: $29.14

Mfg Product Number: 1HX-13310-00-00

Description: ROTOR ASSY 1 for 2000 YAMAHA YZ 426F

Order Quantity: 1

Unit Price: $9.96

Total Cost: $9.96

Mfg Product Number: 93440-10085-00

Description: CIRCLIP,OUTER for 2000 YAMAHA YZ 426F

Order Quantity: 1

Unit Price: $1.70

Total Cost: $1.70

Mfg Product Number: 93210-10197-00

Description: O-RING for 2000 YAMAHA YZ 426F

Order Quantity: 1

Unit Price: $2.76

Total Cost: $2.76

Mfg Product Number: 99009-12400-00

Description: CIRCLIP for 2000 YAMAHA YZ 426F

Order Quantity: 1

Unit Price: $0.78

Total Cost: $0.78

Mfg Product Number: 93210-10197-00

Description: O-RING for 2000 YAMAHA YZ 426F

Order Quantity: 2

Unit Price: $2.76

Total Cost: $5.52

Mfg Product Number: 5BE-18501-00-00

Description: FORK, SHIFT 1 for 2000 YAMAHA YZ 426F

Order Quantity: 1

Unit Price: $30.16

Total Cost: $30.16

Mfg Product Number: 5BE-18503-20-00

Description: FORK, SHIFT 3 for 2000 YAMAHA YZ 426F

Order Quantity: 1

Unit Price: $31.13

Total Cost: $31.13

Mfg Product Number: 93102-12321-00

Description: OIL SEAL,SD-TYPE for 2000 YAMAHA YZ 426F

Order Quantity: 1

Unit Price: $4.78

Total Cost: $4.78

Mfg Product Number: 5BE-15451-00-00

Description: GASKET, CRANKCASE for 2000 YAMAHA YZ 426F

Order Quantity: 1

Unit Price: $3.90

Total Cost: $3.90

Mfg Product Number: 5BE-15462-00-00

Description: GASKET, CRANKCASE for 2000 YAMAHA YZ 426F

Order Quantity: 1

Unit Price: $7.96

Total Cost: $7.96

Mfg Product Number: 5JG-15453-00-00

Description: GASKET for 2000 YAMAHA YZ 426F

Order Quantity: 1

Unit Price: $5.44

Total Cost: $5.44

Mfg Product Number: 90215-20231-00

Description: WASHER,LOCK for 2000 YAMAHA YZ 426F

Order Quantity: 1

Unit Price: $1.32

Total Cost: $1.32

ORDER TOTALS:

Item Total: $732.57

Tax: $0.00

Shipping: $42.00

Order Total: $774.57

[Guest BrandonV]

Man o' man! This is the best reply to one of my posts EVER!!!!! Rick that is so great of you to do that. Much appreciated!

Grayracer513... thanks for the reality check and chuckle. I needed it after today.

I'll let you know how that decomp plug works one of these days..... hopefully.

Edit: Rick, why not get the 01' crank and lose the CB key?

[Rick_Graham]

Man o' man! This is the best reply to one of my posts EVER!!!!! Rick that is so great of you to do that. Much appreciated!

Edit: Rick, why not get the 01' crank and lose the CB key?

Honestly, I've never had a problem with the key and the crank assembly was cheaper! Since I'm doing the top end as well it came down to$$$$$$$$.