Stef

Ok, Cheers, I'll check the Spark plugs and get the new carb manifold Rubbers, then see where I stand. Again, thanks for your input.

Thank you all for your input, I've yet to test the spark plugs, and i think maybe changing the carb manifold rubbers would be worth doing, I did give them a good clean but, they were a bit on the hard side, I hoped I would get away with them. With regard to the carb syncing, I can't see how I can do that if I can't get the engine to tick over without the choke on full.

Thank for your input. I'm not a mechanic so please bare with me, I take your point about balancing and I'll look into that. From what I could see the diaphragm could only go in one position because of the integral loop locator that fits into the relieve in the carb body so I'm pretty certain the diaphragm's went back properly and I did them one at a time so as not to get them mixed. I'm not sure I understand what you mean when you said "assuming you set the needles height correctly" do you refer to the Diaphragm needle height? if so, I didn't disassemble the diaphragm assembly so they went back as they came out, I just checked for damage. Finally, I wondered about the Spark plugs and I will test them. Thanks again for you input.

Hi, I have a Honda 1990 CBR600 FL I’ve had it on and off the road since 1995 but it’s been standing for about 2 years without starting, undercover in my shed, and now it’s not running well at all. After some trouble and some help from a friend I got it started, now, it starts almost immediately on full choke but if I try to relieve the choke or increase the throttle, it cuts out, it ticks over a little rough with the occasional backfire through the exhaust. To date I have:- Fitted new Battery (the old one lacked power) Replaced the old starter solenoid (But it wasn’t necessary) Drained the old fuel to replace with new Cleaned and set the Spark Plug gap Removed cleaned and replaced the fuel tank Tap assembly Checked the flow rate from the fuel pump (recommended flow should be a min of 700 mls /min. Actual Flow 1800 mls/min) Fitted a new fuel pump relay Removed the Carbs and freed a sticky Diaphragm piston, the other 3 working fine removed and cleaned all float valve seats and replaced with new washer checked all and replaced 1 sticky float valve, and removed and cleaned all Main, Needle and Pilot jets with carb cleaner and compressed air. replaced all 4 Pilot mixture screws with new, all set at 2.5 turns back from stop. cleaned all bowls and fitted new ‘O’ rings to drain screws. new seals to bowl covers Finally, I cleaned and released the idle screw assembly which was rusted solid. I put it all back together and I still have the same problem, no change. Any advice would be gratefully received. Stef