katarn444
New Member
Hi All,
I am in the process of installing a Hyway MS390 bigbore kit on a free low hour MS290. I am halfway through but struggling with decisions around the carb. At bare minimum I want to rebuild the stock one but can't figure out the model. On the left side of the adjustment screws it has a big "HD" then under it has a little "18C" then under a big "L" then under a little "141". On the right side of the adjustment screws it has a little "140" and under a big "H". Lastly on the pump cover it has "21-477 T8-7"
First question is can anyone help identify this as I have not been able to. I find rebuild kits that look right but do not have these model numbers.
Second question is it worth rebuilding or should I just get a different carb that may work better with the bigger displacement engine? If so what.
Thanks for your thoughts
I am in the process of installing a Hyway MS390 bigbore kit on a free low hour MS290. I am halfway through but struggling with decisions around the carb. At bare minimum I want to rebuild the stock one but can't figure out the model. On the left side of the adjustment screws it has a big "HD" then under it has a little "18C" then under a big "L" then under a little "141". On the right side of the adjustment screws it has a little "140" and under a big "H". Lastly on the pump cover it has "21-477 T8-7"
First question is can anyone help identify this as I have not been able to. I find rebuild kits that look right but do not have these model numbers.
Second question is it worth rebuilding or should I just get a different carb that may work better with the bigger displacement engine? If so what.
Thanks for your thoughts