toilet not flushing. All aspects of plumbing questions and answers, help, tips and information

[safetyman]

Help please, after looking at the responses to earlier problems of toilet flushing i identified that i needed a new syphon which i duly bought and fitted (close coupled) however after a number of hours of frustration and attaching the handle levers and hook in various positions i am still unable to flush the toilet properly some times it takes two flushes others theree or four, i have checked the stop cock valve and all is ok. if i pull the syphon hook up directly by hand hard then it flushes first time. The water level in the toilet comes to the same level as previous when refilling. i do not have any leaks the unit is a 9.5 inch high syphon from B&Q. i have looked closely at the unit and can not see anytthing faulty with it.
Advise greatly appreciated.
Thanks. :cry:

[nitro23456]

water level.

[htg engineer]

Can you shorten the hook - as it works everytime by hand - maybe the handle is not lifting it up enough to flush ? any movement on handle that could prevent it from working everytime ?

htg

[safetyman]

Water level has been tried at same level and higher than before. Tried shortnening the hook did not make any difference, however i have noticed that sometimes the handle does not come back on its own on other times it is slow to come back up so i shall play about with the combination of positions on the plastic lever again to see if that makesa difference, thaks for the response.