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View Full Version : 1977 atc 90 problem, help?



1979atc
11-17-2015, 04:39 PM
Hello I have an 1977 ATC 90 that bogs at full throttle, everything else seems to be fine, and it idles perfect and has good throttle response, I put on a different carb, new points, checked timing and its fine, moved the points plate and it cleared out and I got it to where it has cleared out enough, but bogs still at full throttle, has anyone had any problems like this, any tips or ideas? Thank you.

81ATC185S
11-18-2015, 02:31 AM
On my 81 200 it was an intake leak and running too lean. Check that.

1979atc
11-18-2015, 02:41 PM
ok ill check it out tonight, if nothing changes ill reply back on here, thank you.

1979atc
11-18-2015, 09:25 PM
I took off csrb cleaned it anyway, and took off intake tube, cleaned surfaces and out back together and runs better but still bogs at full throttle but has cleared out a little also

coolpool
11-19-2015, 08:47 PM
What position is your main needle jet set at? If it's not in the middle of the 5 grooves try it there.