The needle is right down to the top notch and it is still a bit lumpy so I checked the needle jet and found it was 107 rather than the standard 106. Thinking I had found the problem I borrowed a standard 106 needle jet from a spare 286 carb however the physical sizes of the two jets and needles seem to be different (top is the one from the 289).
So my questions are:
- 1) Are 89 and 289 jets physically different sizes? I thought the parts were interchangeable between the two types.
2) Which is the correct needle and jet combination for an 89?
Advice from those in the know please.