No the throttle cable does not stretch. It is a firm connection between the throttle and the carbs' pully. If it were somehow elastic, you would be able to see it because there would be a pause between when you opened the throttle and when the carb pully moved too.
Who did the overhaul on the carbs?
Sounds like a slow intake or carb body leak probably in the diapharm slide.
My money is on fuel supply. You have somehting preventing the floats from filling up. I also would fire your mechanic and work on it yourself. You cant be any worse than them on your first try, and you'd prolly get better with each passing try.
Cool.
Srinath.
Hi,
Had hoses at bottom of carbs and petrol level is fine on both carbs, though if I open to prime and start to drain them plenty of bubbles coming through with the petrol.
Its possibly a carb problem, but same problem on both carbs? hmmm.
I wont spend any more money on it now.
Bubbles in prime... sounds like too much air is getting in somewhere. How does it run on prime in that case. I get a steady stream from all my bikes no bubbles. Check the line that goes to the back of the frame petcock. That is direct line from tank reverve area. Should flow hard and fast from it, and pretty much empty a full tank in a matter of minutes. If that has bubbles, open the tank petcock, if its good, the lower petcock is bad. and BTW is the tank pet chicken fully open or not??? I'll bet that is where you problem is. Lift up the tank slightly from the back and look at it. The screwdriver slot in it should be vertical, not horizontal or inbetween.
Cool.
Srinath.
I had to sort the lower petcock out a couple weeks ago as it was tubed incorrectly and missing the spring in valve thing at back so petrol was flowing constantly.
I've had to adjust the upper fuel chicken on multiple occasions and have it set vertically. Fuel is to my knowledge fine (steady flow) to be flowing fine.
I try prime and reserve and no difference. Petrol coming out the carb drain is bubbly but fuel levels are ok. I wonder where this air can come from if not the petrol line in.
Diagraphms seem ok with no obvious leakages.
OK remove the fuel line that goes toward the back of the lower petcock and see if fuel flows out of it wihtout bubbles. Those bubbles from the drain are bad. clearly shows the inability of the petcocks to fill the bowls up fast enough. Obviously if you think about it, the fuel lines and petcocks should fill the bowls far faster than you can empty it with the drain spigot. People have fuel starvation issues at high speed with a fully functional upper and lower petcock. So they eliminate the lower petcock from the bike and run it to the upper petcock directly. So your air bubbles arean indication the bike's not getting enough fuel. You tank vent may also be to blame. Drain it with the gas cap open and see if its better.
Cool.
Srinath.