Beta Techno Carb Woes

[cello]

I'm having a mare of a time trying to get the carb to stop *issing out petrol that ultimately causes blk oil to leak out of the exhausat header when kicking the bike over!

 

 

Let me explain the bike was running ok until I switched over to reserve one day , after a few minutes of running it cut out and has not run properly ever since, I thought there was crap in the carb so refuled the bike and clesaned the carb out , a thousand kicks later still no good so cleaned the carb again and then a while later drained some fuel and even with tha fuel filter there was debris in the sample. 

I traced this back to a damaged fuel filter so replaced it and clenaed carb again abut still no luck , the bike feels like its binding a bit when i kick it over but still get blak crap out of the header. 

I cleaned the carb and set the float height and also had the choke to pieces but still it does not fire up , cleaned and checked the plug and still nothing.

Weeks later I'm wondering if the floatr height is the issue as looking on the net there seems to be conflicting advice on float height , some say 15mm some say 20mm , some say level tangs with float tangs , I'm confused now and wonder if someone with a working techno on a mikuni carb with plastic floats that slide up and down on pins can give me some advice on how to best set the float height please.

I like the techno but now this bike is like the Tardis and i'm losing time not getting anywhere.

The carb is now off the bike and I can add photos to check the float setting when I've adjusted it correctly just to confirm.

TIA 

[lemur]

Does it make any difference if you raise or lower the front wheel considerably?  That is a tell if the float height is off.  for example: it bogs out every time the front wheel is down in a hole, float height is likely off.

Inspect the reed valves might also be advised, if there is fuel leak down past the reed valves they must not be sealing very well.

[cello]

Thks Lemur, bike wont start atm so cant tell what effect the front wheel height has. Also the reeds are there to prevent back pressure from the cylinder side not the carb side tbmk so doubt they would have any effect on the problem, I did take a look tonight and they looked fine.

 

I'm wondering if the fuel mixture I put in now is too oily and or if the spark plug has seen better days, replacing it anyway and will bung some neat fuel down the airbox to see if this works.

I also cleaned the carb , set the float height to 15mm where the tangs are not level with the casting, slightly downhill looking at it from the side. I hooked the fuel line up switched it on and no leak  fitted it to the bike and with the bike on its sidestand switched the fuel on and...........it *issed fuel out again  LOL FFIN LOUD, FFIN THING