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I wonder if the holes are year specific. You mentioned that your originals had holes but the replacement ones were solid. I just ordered new ones from Yamaha for an '86 and all of them had the holes. Any one have an idea?

I'm leaning towards coasting enricheners for the backfiring but when I first test rode the bike it wouldn't get out of its own way. The dealer changed the plugs and drained the floatbowls and the tank put fresh gas in. It made a world of difference and I rode for about a month. I'm going to make...

So in a nut shell, Plugged or unplugged either way it doesn't matter. I bought all new rubber caps and all of them have holes.

Hey, New here and I joined because I just purchased and 86 vmax.:eusa_dance: But I have a very odd carb question. The bike ran great but after a while, it started to backfire when I let off of the throtle so I figured it was ready for a rebuild on the carb since I was not sure of what the...