R1/R6 RD350 front disc conversion questions

[Scuffed98]

What thickness have did all of you settle on for the rotor spacer? The place I work at has a machine shop so it's really easy for me to ask the machinists to make whatever parts I need on the fly. So far, I've had them make a 13mm spacer. Should I get more made of different thicknesses in case I need to play around with spacing? The bracket and spacer is being made of 6061 aluminum and the bracket has a thickness of 10mm.

[SoCal250]

What thickness have did all of you settle on for the rotor spacer?

https://www.2strokeworld.net/forum/index.php?topic=184.msg991#msg991

[Vintagewannabe]

I also did a post about the exact length of all the hardware used.

[SoCal250]

When I did the disc upgrade on my Daytona, I measured the OE rotor bolts and then added for the thickness of the spacer. Pretty simple. If your calculations come up between common bolt lengths go with the shorter one.
For example: 37 mm then use a 35 mm long bolt. A few millimeters shorter won't have a big impact. If the bolts you select bottom out in the bores you'll have bigger problems.

(What I used will not apply to your application since the RD400F is different than the RD250/RD350/RD400.)

[IR8D8R]

I just did this last year. You are going to end up putting washers between the caliper and bracket if you use the center of the RD disc spider with a 10mm bracket. The bracket needs to be 13mm. In USA everyone uses 1/2" and it works fine. Metric equivalent to grade 8 is 10.9. It looks better if you get Allen head or the original hollow Yamaha caliper bolts. Home Depot has bolts that work. Torque everything to stock RD spec. "Ugga-duggas" not good enough.

IR8D8R

[SoCal250]

A better source for bolts & hardware; Bel-Metric

[Vintagewannabe]

I used pro bolt stainless hardware. The ebay titanium hardware is also pretty nice.