apathetic Posted April 17, 2007 Share Posted April 17, 2007 i made a crude sketch of my fuel lines a friend took a look and said it may be wrong i tried comparing it to a picture in my haynes manual in the manual you can see a line going directly from the petcock to the left carb but you cant see anything going to the right carb he asked my why there is a Y splitter and if there were originally 2 petcocks possibly on the original tank (as if my tank is not original... im not sure though) the fuel line for the left carb is pretty short and flows easily at a downward angle towards the inlet but the fuel line for the right carb come out of the other side of the splitter and actually runs at an upwards angle (against gravity) this is not really portrayed in the sketch but the longer distance needed for the gas to travel to the right carb, as well as the fact that is has to go up and over the left carb to reach the right carb inlet could be a potential source of problems the left intake manifold nipple is connected to an inlet on the petcock im pretty sure its for the vacuum operated petcock so that it only feeds gas when there is vacuum... the right one is plugged the a vacuum hose that has a screw on the end of it is it possible there should be 2 petcocks? is it possible the the petcock should have 2 outlets for gas (i have 1 for gas and 1 for vacuum) can anybody point me in the right direction please? thanks again for your time Link to comment Share on other sites More sharing options...
Moderator drewpy Posted April 18, 2007 Moderator Share Posted April 18, 2007 Hi, thought you had the carbs sussed! 1) the petcock has one supply from the bottom outlet going to the left carb 2) the connector at the back of the petcock goes up underside of the tank and to the right intake. this is the vaccum to operate the flow of petrol (gas) 3) there is a pipe link between the two carbs at the back, just above the float bowls, it also acts like a support between the two carbs so could be misconstrued as such, but is in fact the supply to the right carb. there's lovely for you!! Link to comment Share on other sites More sharing options...
apathetic Posted April 19, 2007 Author Share Posted April 19, 2007 Hi, thought you had the carbs sussed! 1) the petcock has one supply from the bottom outlet going to the left carb 2) the connector at the back of the petcock goes up underside of the tank and to the right intake. this is the vaccum to operate the flow of petrol (gas) 3) there is a pipe link between the two carbs at the back, just above the float bowls, it also acts like a support between the two carbs so could be misconstrued as such, but is in fact the supply to the right carb. there's lovely for you!! thanks again for the help drewpy yeah i was the one with the carb problem but i think i almost fixed it after i reinstalled them the last time after i "fixed" them i didnt get a chance to try to start it for a couple days when i finally got a chance a couple days later, it started on one kick on a cold motor!!! it still had the problem though... my next steps are a carb sync, points/gap, valve adjustment but a friend pointed me in this direction, the petcock, fuel lines, air filters... so i figured id give it a try if i have anymore questions, ill ask as always THANK YOU AGAIN Link to comment Share on other sites More sharing options...
Moderator drewpy Posted April 19, 2007 Moderator Share Posted April 19, 2007 thanks again for the help drewpy yeah i was the one with the carb problem but i think i almost fixed it after i reinstalled them the last time after i "fixed" them i didnt get a chance to try to start it for a couple days when i finally got a chance a couple days later, it started on one kick on a cold motor!!! it still had the problem though... my next steps are a carb sync, points/gap, valve adjustment but a friend pointed me in this direction, the petcock, fuel lines, air filters... so i figured id give it a try if i have anymore questions, ill ask as always THANK YOU AGAIN no problem Link to comment Share on other sites More sharing options...
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