Originally Posted by Motomochila
Martin, looks like engine mounting point, not an issue. Mount up the motor and run it through its paces and then check for leaks. On the rear wheel- go with the 94 or whatever you can find to get a disk mounted. Adding the 30+ pounds to the weight for auxiliary fuel tanks, the stock drum will wear out real fast at race speeds. I raced a 91 factory prepped HRC 626 for a few years and went through rear brakes often, sometimes on only a 250 mile race. Have you looked into the removable sub frame option yet? Copy a CR 250/450 design. Find diagram on the web. Add sleeves at mount points and gussets with holes drilled at all weld points. I will look for pics of my old girl to show you.
Coil- double it up with two units.
Ignition- update to XRL 650
Clutch- heavier springs and plates.
Oil cooler- use XR 400 unit, mount 2 up one on top of the other- cool oil,is your best friend.
Frame- gusset the rear mounts where connected at swing arm- just peace of mind- poor welds here.
Wheels- heavy duty spokes, especially on much heavier rear. Stockers will snap on a square edge high speed bump.
More if my feeble mind can recall what my team did back in 91-2.
Keep the posts coming. - Jerry
Hi Jerry. U are my guide now,thank U!
Double coil with 2 units?Well i get confused on that as we have one cylinder only so one unit for one spark, is the 2nd as a emergency one?(sorry for that dummy question but i just confused:)
Oil cooler-i will use mark set, looks great. I could not buy xr 400 anymore in Europe , only in very bad shape.
Frame-every day im closer to buy that last new frame from the Honda dealer and design new subframe for it.
Havy duty spokes, domu know the place i could ordered it online?