My bike was definately 180 out on the timing but was running spot on as i rode it to the workshop before i done the work. i now stripped the bike got the rear cylinder on tdc then took cams out rotated the engine 360 degrees put cams back in e.c.t anyway i then put it all back together spot on as it should be. the bike then fired up instantly but backfired on start up as soon as i touched the throttle it died. so then started it again fired straight up touched throttle spluttered then stopped. so then alarm bells rang i got worried and thought oh god the timing couldnt of been out so i then put the timing back to what it was at before by rotating engine another 360 degrees with cams off. then put back together. tried starting it and it was pretty much the same problem but didnt start as well and i could tell the engine sounded like it was before i rode it into the workshop more lumpy and had sort of less energy about it so i was now sure that what i done to start with must of been rite as it sounded so much better when it fired up apart from wouldnt rev. i then came to the conclusion that it was another reson why the bike kept stopping when i went to hit the throttle. so..... third time lucky went to change timing again ( so what i initialy went to do in the 1st place 180 out) and thats when unfortuneately the bolt got dropped into the engine, not by me i would like to add lol. so obvs all engine apart then e.c.t and it ended up in the sump now the bike is back together with the timing spot on 100% guarenteed as i could prob do it with my eyes closed now

so the question is will everyone agree that likely cause of this is carbs need cleaning and fresh fuel putting in as i ran tank very low on fuel and i dont have any in line filters on the fuel lines
the bike used to break down and act up like this with same characteristics when used to run the bike low on fuel before i would fill tank up and i think the pressure of the fuel when filling up stirred sh1t up in bottom of the tank and got into the carbs and acted just like it is now spluttering not reving out and back firing.
i also put some fuel in the bike that was drained from a fiesta about 3 weeks ago ooops
on the plus side fresh oil and filter

Feedback would be grand