Rusty McNeil
Well-Known Member
Went through the carbs again last night to have a look and change some jetting and think I found a problem causing my heavy rich issue at idle and up.
Underneath the jet block there is anl o-ring that goes around the brass tube that the needle slides in to. There is a sligh bevel on the back of the jet block to accomadate this o-ring when the jet block is tightened down.
The o-rings were dried out and frail and I had replaced them at the start of this engine project with some of the correct diameter but that were thicker than the old ones.
I didn't realize they were TOO thick, I found that even though the jet block screws were very tight, they were just compressing the heck out of that o-ring but not pulling the jet block down tight and getting a good seal on the jet block, the jet block gasket and the carb body......I could see a visible gap where the jet block should have been tight against the gasket. I missed this last time...
I'm thinking this had to have been contibuting to some kind of problem.....
I put the carbs back together and have them ready to mount and try 'em out this evening or Friday...hope I found it...unk:
Underneath the jet block there is anl o-ring that goes around the brass tube that the needle slides in to. There is a sligh bevel on the back of the jet block to accomadate this o-ring when the jet block is tightened down.
The o-rings were dried out and frail and I had replaced them at the start of this engine project with some of the correct diameter but that were thicker than the old ones.
I didn't realize they were TOO thick, I found that even though the jet block screws were very tight, they were just compressing the heck out of that o-ring but not pulling the jet block down tight and getting a good seal on the jet block, the jet block gasket and the carb body......I could see a visible gap where the jet block should have been tight against the gasket. I missed this last time...
I'm thinking this had to have been contibuting to some kind of problem.....
I put the carbs back together and have them ready to mount and try 'em out this evening or Friday...hope I found it...unk: