Daytona wheels on 76-78 RD400, what’s different?

[Frank B]

I'd like to use RD400 Daytona wheels on my 76, I just like the look better. Supposed to be lighter but a doubt I'd notice... I know I've read the differences on one of the past 2sw boards but I can't remember. The rear sprockets are different so I'd need the correct one when I replace them, and the brake rotor spacing is different right? Grind on the caliper or use a spacer??

[SoCal250]

I can't find my detailed notes on this because it was so long ago. I think it was Diego that I helped with this when he did the swap. Damon did this on his blue '77 because he bought a XS400F front wheel from me, but I can't remember the details on his conversion. The XS400F front wheel is nearly identical to the RD400F front, with the exception of an added provision for dual disc.

-You are correct, the rotor offset is different.
-Front axle is different. '76-78 is 17mm and '79 is 15mm
-I don't recall the difference (if any) in rim mounting width

The difference in wheel weight is minimal between '76-78 and '79. For reference:
Wheel weight - RD400F
      Front: (with powdercoat and bearings) 11.55 lb.
      Rear: (with powdercoat, bearings, and sprocket studs) 16.15 lb.

For reference here are the bearing specs and part numbers:
RD400 C/D/E Front
93306-30317-00 BEARING (6303-Z; 17mm x 47mm x 14mm)
old part #93306-30309-00, 93306-30306-00, 93306-30307-00, 93306-30319-00,  J10-81158-10-00.
(2 bearings – 1 each side)

RD400F Front
93306-30212-00 BEARING (6302-Z; 15mm x 42mm x 13mm)
old part # 93306-30202-00, 93306-30203-00, 93306-30206-00; 93306-30208-00
(2 bearings – 1 each side)

RD400 C/D/E/F Rear
Brake side (right) 93306-30317-00 BEARING (6303-Z; 17mm x 47mm x 14mm)
Sprocket side (left) 93306-30437-00 BEARING (6304-ZZ, 20mm x 52mm x 15mm)

RD400F Rear
Brake side (right) 93306-30317-00 BEARING (6303-Z; 17mm x 47mm x 14mm)
Sprocket side (left) 93306-20469-00 BEARING (6204-RS; 20mm x 47mm x 14mm) Correction 02/23/19
Sprocket side (left) 93306-30437-00 BEARING (6304-ZZ, 20mm x 52mm x 15mm)

[Frank B]

Thanks a ton! That really helps.

[bitzz]

I just did a Daytona rear onto a 1A1 swingarm...actually a DG swingarm. What a piece of CRAP!
Used the 1A1 brakes, and the only difference was the spacer on the right has to be shortened to 0.560".
...which makes it a ROYAL PIA to install.

So what I am doing now is replacing the 6204 bearing (20 x 47 x 14) with a 6005 (25 x 47 x 12) and make the spacer "captive" and 0.639" long.

Also just turn the outside of the stock sprocket down to 0.250", and use a front sprocket from a RZ and you've got a 520 kit (you need a 0.125" washer on the outside of the front sprocket).

[Clem]

I can't find my detailed notes on this because it was so long ago. I think it was Diego that I helped with this when he did the swap. Damon did this on his blue '77 because he bought a XS400F front wheel from me, but I can't remember the details on his conversion. The XS400F front wheel is nearly identical to the RD400F front, with the exception of an added provision for dual disc.

-You are correct, the rotor offset is different.
-Front axle is different. '76-78 is 17mm and '79 is 15mm
-I don't recall the difference (if any) in rim mounting width

The difference in wheel weight is minimal between '76-78 and '79. For reference:
Wheel weight - RD400F
      Front: (with powdercoat and bearings) 11.55 lb.
      Rear: (with powdercoat, bearings, and sprocket studs) 16.15 lb.

For reference here are the bearing specs and part numbers:
RD400 C/D/E Front
93306-30317-00 BEARING (6303-Z; 17mm x 47mm x 14mm)
old part #93306-30309-00, 93306-30306-00, 93306-30307-00, 93306-30319-00,  J10-81158-10-00.
(2 bearings – 1 each side)

RD400F Front
93306-30212-00 BEARING (6302-Z; 15mm x 42mm x 13mm)
old part # 93306-30202-00, 93306-30203-00, 93306-30206-00; 93306-30208-00
(2 bearings – 1 each side)

RD400 C/D/E Rear
Brake side (right) 93306-30317-00 BEARING (6303-Z; 17mm x 47mm x 14mm)
Sprocket side (left) 93306-30437-00 BEARING (6304-ZZ, 20mm x 52mm x 15mm)

RD400F Rear
Brake side (right) 93306-30317-00 BEARING (6303-Z; 17mm x 47mm x 14mm)
Sprocket side (left) 93306-20469-00 BEARING (6204-RS; 20mm x 47mm x 14mm)

Russ, I just went through an ordeal with all balls about the 79 rear bearings. They are the same as the C, D and E. The parts manual that I have for the Daytona has the incorrect part number also. The all balls guy told me that I must have earlier wheels on my bike. I was like, I don't think so bud. Anyway, I recently pulled out a 6303 and 6304 from my Daytona rear wheel.

[Tuck]

All Balls bearing kits you need for Daytona wheels are...
Front:  25-1316
Rear:   25-1340

[Frank B]

Thanks all !
I'm waiting for the wheel to arrive, it should have the axle and spacers with it. I'll mock it up first to be sure it all works before I order bearings and sprocket.

[SoCal250]

Russ, I just went through an ordeal with all balls about the 79 rear bearings. They are the same as the C, D and E. The parts manual that I have for the Daytona has the incorrect part number also. The all balls guy told me that I must have earlier wheels on my bike. I was like, I don't think so bud. Anyway, I recently pulled out a 6303 and 6304 from my Daytona rear wheel.

Thanks for the correction! I would have had a big surprise when I finally got around to doing my rear wheel. ;)  I've only done the front at this point.

It's strange that the error has existed in Yamaha parts records for 40 years! I can see it happening in a vintage OEM Parts List maybe once or twice, but you would think it would get revised over time. The current online parts fiche still shows the wrong part. I guess you never know.

[Clem]

Russ, I just went through an ordeal with all balls about the 79 rear bearings. They are the same as the C, D and E. The parts manual that I have for the Daytona has the incorrect part number also. The all balls guy told me that I must have earlier wheels on my bike. I was like, I don't think so bud. Anyway, I recently pulled out a 6303 and 6304 from my Daytona rear wheel.

Thanks for the correction! I would have had a big surprise when I finally got around to doing my rear wheel. ;)  I've only done the front at this point.

It's strange that the error has existed in Yamaha parts records for 40 years! I can see it happening in a vintage OEM Parts List maybe once or twice, but you would think it would get revised over time. The current online parts fiche still shows the wrong part. I guess you never know.

No problem. When I went back and looked on the economy cycle website, John only list's one set of rear wheel bearings for all year RD400's. I should have just ordered from him and saved the two weeks of waiting on the refund from All balls. This isn't a knock on them as all parts fiche's have the wrong parts on them also.

[SoCal250]

This info may be of some use.
http://www.2strokeworld.net/forum/index.php?topic=65.msg791#msg791

It should help others in the future too 8)

[Frank B]

Thanks for that !!