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For anybody who might read this thread, earlier there was mention of jet sizes. I always thought the intermediate sizes were .005mm. What I mean is the size graduation was like this....130, 132.5, 135, 137.5, 140, etc. So it seems to me some vendors might round up while others round down. That's why you get 137 or 138, but really they're the same size.



Derek,
That's good info, and not easy to find. I'm sure you are correct. I don't know where I read about jet sizes. I just looked in my Zimmerman book, Essential Guide to Motorcycle Maintenance, but it's not there. I think I saw it in another forum somewhere. It makes sense that the sizes make bigger jumps. I've heard of guys drilling out their own jets, and I wondered how accurate that can be. I guess it's all relative.

I was just messing around here at my desk, looking at some old jets under a 10X loupe. This thing is great for checking hard to see jet size markings and burrs in the jet holes. I can see on these 150 jets that the hole is about 1.5 mm according to my metric ruler. (as it should be) (Yes, I entertain myself with mindless little exercises like this.) I started thinking that 1.5mm is pretty big, and maybe I had hallucinated the size thing, but that's what it is. I was just sanity checking myself. I still get a little messed up figuring metric sizes in mm and cm.

Cody

I was born a long ways from where I was supposed to be. - Bob Dylan