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269 Posts
Owned my Heidi for almost a year ('99 shadow ace 750) and today on the way home she starts idling real rough and lost power. I limped her home, and my first thought was that one of the cylinders wasn't firing right -- pulled the plugs and both of the plugs in the rear cylinder came out soaking wet and black. I changed the plugs to iridium ones when I first got her and have pulled them periodically to be sure nothings getting screwed up. Every time I pull them they look great -- so this is kinda out of the blue. I cleaned up both plugs and confirmed they are gapped right, and have plenty of spark to them. I cleaned the air-filter too. put it all back together and yep... SUPER rich in the rear cylinder, and normal in the front. Thoughts? have I suddenly lost compression in the rear cylinder? Nothing's ever leaked on her... stuck float? clogged needle? ugh... I've always done pretty good at avoiding working on carbs, but I guess I'll have to jump into it this time. I'm just surprised it happened so quickly, no warning and no obvious catalyst for this.
I'm planning on spending some quality time with the exploded carb diagram in my shop manual tonight.
