pull that carb rack and disassemble all the way to jets and soak in yamahalube carb dip, 5-6 hours easy, then blow out with compressed air, all passage ways, soak again, 3 times do this, make sure jets are soaking as well or replace with new,
if you use the old you will have to polish the orifices.. easy enough if you have twine and some polish, coat the twine with polish, thread thru jet, secure both ends of twine the run the jet back and forth on the string spinning it so the orifice gets good and polished, maybe 2 stages of polish, really helps to keep em clean in the future and insure all residue is gone.
then when assembling pay strict attention to float height in that they are all the same and measured correctly, folks here can help with that, then insure all rings are good, gaskets and diaphragms are 100%, slides operate smoothly and not too loose and all needle clips are the same, follow base settings in service manual for clip settings and float height..
then bench sync the butterfly openings, videos on that on yootube, then sync with gauges while running,
check valve lash, timing marks, chain slack so forth, new plugs, new oil and filters she should run very well..
then go over tank, pump and petcock.. cleaning and replacing anything old or worn, crispy.. if tank is solid rust gunk evaporust will get her down to bare metal. some pump parts can be found still, fresh petcocks or rebuild kits, be sure your hoses are new, fuel line and you use good stock clamps for trouble free operation ..
if you use the old you will have to polish the orifices.. easy enough if you have twine and some polish, coat the twine with polish, thread thru jet, secure both ends of twine the run the jet back and forth on the string spinning it so the orifice gets good and polished, maybe 2 stages of polish, really helps to keep em clean in the future and insure all residue is gone.
then when assembling pay strict attention to float height in that they are all the same and measured correctly, folks here can help with that, then insure all rings are good, gaskets and diaphragms are 100%, slides operate smoothly and not too loose and all needle clips are the same, follow base settings in service manual for clip settings and float height..
then bench sync the butterfly openings, videos on that on yootube, then sync with gauges while running,
check valve lash, timing marks, chain slack so forth, new plugs, new oil and filters she should run very well..
then go over tank, pump and petcock.. cleaning and replacing anything old or worn, crispy.. if tank is solid rust gunk evaporust will get her down to bare metal. some pump parts can be found still, fresh petcocks or rebuild kits, be sure your hoses are new, fuel line and you use good stock clamps for trouble free operation ..
