jbeebe
Been Around the Block
79 CB650, Keihin mechanical carbs, not the later CV style carbs.
After pulling them in/out a few times in a row to clean the pilot before riding season and adjust the choke cable that I shortened and moved to the side of the carbs I must have caused some sort of damage to the #4 carb body. The slide will not move freely in the chamber. To get it out I had to heat up the chamber and pry it out. It will not go in without a mallet (just to give an example of how messed up it is). I've swapped slides and narrowed it down to the chamber itself, not the slide. (The #4 slide works fine in other carbs, but other slides won't work in the #4 carb.)
Both the slide and chamber are free of burrs or gouges. Things i've tried so far:
- Sanded the inside walls with 300, then 500 sandpaper to ensure it's smooth.
- I measured the slide at 15/16", made a steel rod of the same size with a chamfered leading edge. My plan was to ram this in the chamber to correct any deformities in the wall. The round steel stock must be a couple thousandths shy of what the slide is, because it slides freely.
I'm just not sure where to go next with this....
Here's a poser shot of the bike last season before doing some more work.
Thanks!
After pulling them in/out a few times in a row to clean the pilot before riding season and adjust the choke cable that I shortened and moved to the side of the carbs I must have caused some sort of damage to the #4 carb body. The slide will not move freely in the chamber. To get it out I had to heat up the chamber and pry it out. It will not go in without a mallet (just to give an example of how messed up it is). I've swapped slides and narrowed it down to the chamber itself, not the slide. (The #4 slide works fine in other carbs, but other slides won't work in the #4 carb.)
Both the slide and chamber are free of burrs or gouges. Things i've tried so far:
- Sanded the inside walls with 300, then 500 sandpaper to ensure it's smooth.
- I measured the slide at 15/16", made a steel rod of the same size with a chamfered leading edge. My plan was to ram this in the chamber to correct any deformities in the wall. The round steel stock must be a couple thousandths shy of what the slide is, because it slides freely.
I'm just not sure where to go next with this....
Here's a poser shot of the bike last season before doing some more work.
Thanks!