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1987 KZ305LTD low power 09 Nov 2023 09:57 #891524

  • Nerdy
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To me this sounds like you have a lean condition. You mentioned what you've done so far, and the list does not appear to include new intake boots or checking for leaks around the existing boots. The original boots would be rather inflexible / non-pliable at this point, so even if they are not cracked it is entirely possible you have an air leak on one or both sides.

Something else to try: get an infrared thermometer and check the temperatures of both headers while the engine is running. If one is noticeably lower than the other, that is a weak cylinder. If they are the same, either they're both fine or your problem is evenly distributed. :)
1979 KZ400 Gifted to a couple of nephews
1967 Yamaha YCS1 Bonanza
1980 KZ440B
1981 Yamaha XT250H
1981 KZ440 LTD project bike
1981 GPz550
2013 Yamaha FZ6R

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1987 KZ305LTD low power 09 Nov 2023 11:28 #891526

  • Triryder
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Something I didn't think about, switches dropping voltage to the coils.  I will certainly look into that!  Thank you again!

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