Post by dpress on Nov 13, 2019 12:52:14 GMT -5
Hi there, I am in the UK and a new owner of a Homelite XL, which is an export model XL TI-SL, UT 10619C, manufactured in September 1987 (from the serial number). I bought this saw recently and it came with an almost complete second machine which unfortunately has no serial number tag, but which I believe is a similar model from 1982.
Both saws are fitted with Walbro carbs, the 1987 saw had an HDC model fitted, and the parts saw a Walbro HDA 60. In an effort to get one going I swapped carbs between saws until I can locate a repair kit for the HDC which had very stiff diaphragms - the HDA ones were much better. The HDC unit is date stamped 1987 and the HDA unit is marked 1982.
I have got the saw running, and just need to fine tune the carb - I have started out with both mixture screws at 1 1/4 turns out. With the saw running and fairly warm, I don't seem to get a great deal of difference when adjusting the L screw (screwing it in) so have left it at about 1 turn out. When running the saw flat out but not under load, the machine seems to be suffering from fuel starvation after a couple of seconds as it starts to fade, but will happily drop down to tick over for a second before I try to rev it again.
Anyway, sorry for the long preamble - my question is whether it is advisable to swap carbs as I have done - is the HDA a direct suitable replacement for an HDC unit? I intend to rebuild one of the carbs but would appreciate advice on which is the better one (if there is any difference in performance) - certainly they are different internally.
Finally the machines both had air filters fitted which appeared to be original type, but the one fitted to the complete 1987 machine (with HDC carb) was different in that it had a second piece of black foam glued to the rear of the sponge filter - this black foam was the same shape as the filter, with 4 small holes in it, which seemed to me to be a kind of air restriction device as the black foam does not flow air, and there were marks on the rear of the sponge filter which indicated the machine was just breathing through the 4 holes. Can anyone advise what this might be, and if I should refit it with either carb? I have at present simply made a filter out of some motorcycle filter foam I had, but will source the correct item at some point.
Many thanks for reading all the above! Steve
Both saws are fitted with Walbro carbs, the 1987 saw had an HDC model fitted, and the parts saw a Walbro HDA 60. In an effort to get one going I swapped carbs between saws until I can locate a repair kit for the HDC which had very stiff diaphragms - the HDA ones were much better. The HDC unit is date stamped 1987 and the HDA unit is marked 1982.
I have got the saw running, and just need to fine tune the carb - I have started out with both mixture screws at 1 1/4 turns out. With the saw running and fairly warm, I don't seem to get a great deal of difference when adjusting the L screw (screwing it in) so have left it at about 1 turn out. When running the saw flat out but not under load, the machine seems to be suffering from fuel starvation after a couple of seconds as it starts to fade, but will happily drop down to tick over for a second before I try to rev it again.
Anyway, sorry for the long preamble - my question is whether it is advisable to swap carbs as I have done - is the HDA a direct suitable replacement for an HDC unit? I intend to rebuild one of the carbs but would appreciate advice on which is the better one (if there is any difference in performance) - certainly they are different internally.
Finally the machines both had air filters fitted which appeared to be original type, but the one fitted to the complete 1987 machine (with HDC carb) was different in that it had a second piece of black foam glued to the rear of the sponge filter - this black foam was the same shape as the filter, with 4 small holes in it, which seemed to me to be a kind of air restriction device as the black foam does not flow air, and there were marks on the rear of the sponge filter which indicated the machine was just breathing through the 4 holes. Can anyone advise what this might be, and if I should refit it with either carb? I have at present simply made a filter out of some motorcycle filter foam I had, but will source the correct item at some point.
Many thanks for reading all the above! Steve
