"86 Yanaha 150- I'm in trouble - lost pilot jet - no longer availabler part

[rickclark]

Was in the final stages of clean and rebuild last of 3 carbs. Drying pilot jet with compressed air when I lost grip on pliers and this little (4mm) brass jet was gone. Have torn my workshop aparat to no avail. (magnetic sweep doesn't work) Have searched internet extensively. Jet is discontinued part, available no where.
Found outboard recycling firm in Florida has used Yamaha carbs, but not mine. Suggestion is to take smaller jet #60 and drill out to the #72 I need. Is this dangerous? What risk am I taking if any. Will welcome info on sourrce for used carb and any other suggestions on solution.

 

[gm280]

You could remove one of the jets from one of the other carbs and go to a machine shop and see if they can duplicate it. It really shouldn't be that difficult to do. In fact if you can get the proper jet thread size, yes you can drill one out to make it work. It really isn't that hard to manufacture one. Maybe even a jet from some other type carb would give you a jet to work with and fit. I honestly don't think that the carb manufacture made specially built jets just for their carb. More then likely standard size jets off the shelve. So there could be lots of other jets that could fit perfectly... JMHO!