Carb hassle

[Jeb]

Hi all,

my 1100f wont run without the choke...I've checked pilots, they look clear but who knows,  float heights seem ok but I'm not sure if I'm measuring them right. The bike was running ok before I pulled the carbs off a few years back. Any thoughts , cheers 

[Jeb]

Hi, float heights seem to be about 12.5mm, would this account for it?

Thanks again 

[Gixer1460]

Not saying this is right or wrong way - but its my way LOL Turn carbs right way up so float is drooping and hold them in a vice or suchlike to give two hands free. Then move float up until the tang over the float valve plunger is just starting to compress it, then measure from middle of float seam to float bowl gasket surface. Alternatively mount rack in vice all assembled and add 4No. clear plastic tubes to bowl drains and secure them beside each carb body, open the drain taps with free fuel flow from header tank - once all bowls full you should be able to see relative levels compared to one another and compared to what manual says they 'should be'

[Jaydee]

The way you are getting your measurement is wrong. You have the carbs upside down which put the weight of floats on the float needle. You need to have the carbs sideways so the floats hinge is highest. The floats swing till they stop against the float needle with no float weight on them.

My guess iss it's a problem with your slow jets or slow air jets being blocked. You are bypassing the slow circuit when you run on the choke circuit. 

[Jeb]

Right,  will give it a go...thanks to you both!!

[TonyGee]

not saying this is your problem but did you adjust the idle screw ?  you'd be surprised at how many people forget to adjust it to get an idle.  

[Jeb]

Hi ,yes I did unfortunately,  would have loved it to be that simple...have got jets in acetone atm, hopefully the problem 

[TonyGee]

1 minute ago, Jeb said:

Hi ,yes I did unfortunately,  would have loved it to be that simple...have got jets in acetone atm, hopefully the problem 

ok cool, also check the pilot hole drillings as they can get blocked, good luck  

[Jeb]

Cheers!!!

[Jeb]

Float heights are correct and pilots cleaned and we have lift off!!...one of the downpipes is cooler than the others but it is running on 4 ..any ideas??

Thanks 

[TonyGee]

12 minutes ago, Jeb said:

Float heights are correct and pilots cleaned and we have lift off!!...one of the downpipes is cooler than the others but it is running on 4 ..any ideas??

Thanks 

probably running a bit on the rich side on the cooler cylinder. 

[Jeb]

Will have to balance carbs anyway, will check air screws..cheers for the reassurance