junker Posted August 27, 2009 Share Posted August 27, 2009 Alright i haven't posted on these forums almost all summer this year, but this thread might interest some techs and serious tinkerers. i have been tinkering with my bike (my 1988 FZ-600U) the forever, rode it a few times but persistent problems need to be fixed. Mostly these are with electrical issues and with the carburetors. The electrical fixes are pretty simple - "buy new parts!" But the carbs are a bit trickier, i can't just buy new carbs because Yamaha doesn't have them anymore. And if they did, the greyed-out price in the catalogs is well over $1000USD!!! I can go on buying bits and pieces here and there for things like for example the float needle valves ($65 each, need 4 so that totals= $260... JUST FOR FLOAT VALVES) -I got on the track of the newer mikuni carbs out there. Stay with me; the FZ600 uses mikuni BS-30 round-slides. They are 30mm round slide carburetors... Many of the sites i go to sell these new, singular Mikuni TM Flat-slides, and better yet: 30mm ROUND-SLIDES too (specs indicate theat they would fit into the carb boots too)!! apparently the entire carb comes for around $100-$150, brand new (an entire carb for less than Float Valves). According to my calculations that about $400~$600 for a set of Four Brand New Carbs With No Problems... Saving me hundreds upon hundreds with no headaches. I know the carbs come individually and i would have to fabricate a bit of things, like a plate to hold them all together (which they seem to have screw holes on the carb body for...), a throttle plate connector, and a choke connector, and maybe a system for dividing the fuel to each of them. But in theory this could actually work right??? Has Anyone Dealt with these carbs? heres a link to one im looking at: http://www.jcwhitney.com/autoparts/Product...tt=needle+valve and bikebandit: http://www.bikebandit.com/product/16986 Link to comment Share on other sites More sharing options...
Twin Shock Posted August 28, 2009 Share Posted August 28, 2009 Alright i haven't posted on these forums almost all summer this year, but this thread might interest some techs and serious tinkerers. i have been tinkering with my bike (my 1988 FZ-600U) the forever, rode it a few times but persistent problems need to be fixed. Mostly these are with electrical issues and with the carburetors. The electrical fixes are pretty simple - "buy new parts!" But the carbs are a bit trickier, i can't just buy new carbs because Yamaha doesn't have them anymore. And if they did, the greyed-out price in the catalogs is well over $1000USD!!! I can go on buying bits and pieces here and there for things like for example the float needle valves ($65 each, need 4 so that totals= $260... JUST FOR FLOAT VALVES) -I got on the track of the newer mikuni carbs out there. Stay with me; the FZ600 uses mikuni BS-30 round-slides. They are 30mm round slide carburetors... Many of the sites i go to sell these new, singular Mikuni TM Flat-slides, and better yet: 30mm ROUND-SLIDES too (specs indicate theat they would fit into the carb boots too)!! apparently the entire carb comes for around $100-$150, brand new (an entire carb for less than Float Valves). According to my calculations that about $400~$600 for a set of Four Brand New Carbs With No Problems... Saving me hundreds upon hundreds with no headaches. I know the carbs come individually and i would have to fabricate a bit of things, like a plate to hold them all together (which they seem to have screw holes on the carb body for...), a throttle plate connector, and a choke connector, and maybe a system for dividing the fuel to each of them. But in theory this could actually work right??? Has Anyone Dealt with these carbs? heres a link to one im looking at: http://www.jcwhitney.com/autoparts/Product...tt=needle+valve and bikebandit: http://www.bikebandit.com/product/16986 Thats the going price for round slides, call Sudco and they will sell you the exact carb for your bike. Link to comment Share on other sites More sharing options...
JimR Posted August 29, 2009 Share Posted August 29, 2009 Alright i haven't posted on these forums almost all summer this year, but this thread might interest some techs and serious tinkerers. i have been tinkering with my bike (my 1988 FZ-600U) the forever, rode it a few times but persistent problems need to be fixed. Mostly these are with electrical issues and with the carburetors. The electrical fixes are pretty simple - "buy new parts!" But the carbs are a bit trickier, i can't just buy new carbs because Yamaha doesn't have them anymore. And if they did, the greyed-out price in the catalogs is well over $1000USD!!! I can go on buying bits and pieces here and there for things like for example the float needle valves ($65 each, need 4 so that totals= $260... JUST FOR FLOAT VALVES) -I got on the track of the newer mikuni carbs out there. Stay with me; the FZ600 uses mikuni BS-30 round-slides. They are 30mm round slide carburetors... Many of the sites i go to sell these new, singular Mikuni TM Flat-slides, and better yet: 30mm ROUND-SLIDES too (specs indicate theat they would fit into the carb boots too)!! apparently the entire carb comes for around $100-$150, brand new (an entire carb for less than Float Valves). According to my calculations that about $400~$600 for a set of Four Brand New Carbs With No Problems... Saving me hundreds upon hundreds with no headaches. I know the carbs come individually and i would have to fabricate a bit of things, like a plate to hold them all together (which they seem to have screw holes on the carb body for...), a throttle plate connector, and a choke connector, and maybe a system for dividing the fuel to each of them. But in theory this could actually work right??? Has Anyone Dealt with these carbs? heres a link to one im looking at: http://www.jcwhitney.com/autoparts/Product...tt=needle+valve and bikebandit: http://www.bikebandit.com/product/16986 looking at the pics they show non CV carbs .... fitting carbs that are pulled open via a cable rather than vacuum may cause you many problems i.e. doing the splitter cable from 1 to 4 ! I would also suggest using that form of carb (if you get over the cable problems) will be different if not impossible to set up ... sorry to pee on the bonfire but I guess there is somewhere you can get a bank of carbs from at a reasonable price. Regards Jim Link to comment Share on other sites More sharing options...
junker Posted September 3, 2009 Author Share Posted September 3, 2009 you didnt piss on my parade jim, i was wanting an honset opinion and yopu gave yours. i argree it would be almost impossible and i would have endless things to tweak or fix, so i called sudco like the other guy advised and they told me they dont make the BS30's anymore (already knew that...) however they said they had a rack of new carbs by Keihin for around $600-$800 that would fit right in. I went to the site and looked at them the new CR-29mm's are pretty badass, they come already set up together and are brand new, and are very racing oriented. I am going this route. there is a difference of 1mm in the bore, but i think the new carbs would more than surpass my old ones even if i fixed their problems. thanks for your guys' help. My bike will be thundering the sidewalks of campus again soon!!! Link to comment Share on other sites More sharing options...
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