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not a GS-XL250 electrical problems...help!

  • Thread starter Thread starter midnightcafe
  • Start date Start date
M

midnightcafe

Guest
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.
 
midnightcafe said:
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.
Click to expand...
Since you are in a time crunch, I guess I would run the total-loss system, with two batteries in parallel if you have the room.
 
Your carb setup is likely similar to my xl 350. There's an o-ring at carb spigot to head- as head gets real hot, a tired o-ring might allow air to slip by causing erratic running. If it was magneto related, I'd think it would be hard to start cold.
 
tom203 said:
Your carb setup is likely similar to my xl 350. There's an o-ring at carb spigot to head- as head gets real hot, a tired o-ring might allow air to slip by causing erratic running. If it was magneto related, I'd think it would be hard to start cold.
Click to expand...

I'll check it out, thanks.
 
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