Problem with fuel starvation

[blue]

also check all the hoses for leaks............or replace.

[The Rookie]

Thanks, I am experienced with cars, all that has been done, thing isit ran fine for 100 miles and then started to do this after shorter and shorter runs, most things suggested are black and white failures, this appears a shade of grey!

[The Rookie]

Finally got the cam cover off and the valve clearances are down to nothing so will reset them (and try and get the snapped stud out!), what should they be (searching not helped yet!)

[The Rookie]

OK found a thread (not sure why search wasn't finding it) clearances reset, but still won't start, spins over fine, has spark at the pluf, has fuel in the float bowl of the carb and in supply hose but not a dicky, not even a stutter.

[whiteknight]

(and try and get the snapped stud out!), what should they be

are you talking about the engine studs?? the one that hold the rocker arms and cylinder and head in place. they need to be torqued down to 1.8/2.2 kgf-m or 13 lbs to 15.91 lbs of torque.

[wordslinger]

...what stud is snapped, and since yo've said it twice, how do you know there is fuel in the bowl??


..open the airbox, remove the air filter (clean / inspect) and spray a one-half second burst of starting fluid into the carb's intake tubing..

..try to start engine..if it fires, then your jet(s) are most likely clogged...


..btw, dont rev your engine while burning starting fluid, and shut it off as soon as it fires!!!

..that stuff burns really hot and, along with the increase in air-flow, causes an extremely lean combustion condition...




peace

[wordslinger]

..also, check the fuses in the batteery compartment..

..they are 7amp glass AGC type automotive fuses...

[The Rookie]

Fuses checked a long time ago.

I know there is fuel in the carb float bowl as I've had it off twice and each time fuel comes out!

Snapped stud was one holding the breather to the head, no biggy right now if the engine won't start!

No joy with easy start either, not a cough.

Plug in HT lead laid on engine, lots of nice bright sparks.

[streido]

If you still have that spare cdi then maybe try that in just to rule out the cdi thats in there?

If you got spark, got fuel, got air etc its weird it wont fire 

Only thing i can think is its not taking the fuel out the bowl properly but then i wouldve thought spraying the easy start in wouldve gave it a little idle at least.

Wheres Zombie..........ZOMBIE.......

[The Rookie]

The spares CDi went on there that first afternoon at the roadside!

I've blown through all the jets, all seem clear.

What I find most strange is the way it ran for a while before losing power and then cutting out, then each time running for less time and taking longer to re-start which would normally indicate a relatively minor issue, but nothing seems to stack up. I've worked on plenty of cars and never have I had anything like this, at least if it's coughing and spluttering you can try stuff to try and make it better, this is just dead!

[streido]

Only other thing i can think of is a blockage or bad fuel line somewhere but since it had fuel in the bowl and still wont fire at all i cant see how it could be that either 

Its even bugging me now to find out what it is.

[blue]

take the gas line off the petcock and turn the bike over to see if gas well come out.and also the other air lines going to the tank make sure they are working ok. check gas filter. how is the seal on the gas tank cap.

[The Rookie]

Filter blown through, fuel flows from supply hose when cranking (with it off the carb) all first day checks...

[zombie]

Compression test. I bet a valve is leaking.

[The Rookie]

Thats a possibility, unfourtanetly I don't have my tester right now, exhaust I'm reasonably confident is OK (and usually the more likely to have an issue) due to the suction on the manifold when spinning the engine over, harder to test the inlet of course, clearamces were too tight (like nothing) though which isn't good.