xl250 thumper-stator/electrical woes- HELP!

midnightcafe

Been Around the Block
alright, so I promised everyone I know that I'd finally race my '72 Honda XL250 this Sunday at the Electric City Riders Memorial Cup-the biggest race of the year, in the vintage TT class. However, it runs terrible. When cold, it runs great. After warming up, wind the throttle and it bogs down. I believe it to be electrical, so I replaced the coil, plug cap, condensor is fine, points I believe are fine (since the issue relates to engine temperature).

My friend at the local British motorcycle shop says I should take a look at the lower ignition coil aka the stator assembly. Only problem is it costs $160 without shipping, and I'd need to get it overnighted in time for the race. Since it's a 6v machine and it's running without the battery, my other option is to run it with a battery total-loss in the race, which would take time to setup and it's not guaranteed either.

Any other thoughts as to the problem at hand would be greatly appreciated. It's got a big bore kit, hot cam, mikuni VM32 round slide carb with the needle at the top notch, 200 size main jet. thanks!
 
If it is electrical can you use one of the other legs of the stator it has three right one for the coil one for the battery and one for the lights. I ask but don't know if the power coming off all three leads are the same watts/volts.
 
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