Yamaha updated the carbs on the 87 Exciter from butterfly Mic. to the 38mm round slides Mic. with a power jet.
88 Exciter came stock with the 38mm round slide with power-jets
The 88's had a update to plug off the power-jet and rejet the main.
I think PSI was the first to find the problem, and it was a mid range lean spot from the needles.
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