Left carb problems ::solved::

[clowwarrior]

Hi guys I was trying to figure this out on my own but my lack of skills have shown, never worked with carbs before now or much of anything for that matter.

Anyway the problem I'm having is with the left carb the cylinder wont fire and leaks gas out of the exhaust where it meets the engine, the float is good no cracks also last owner has messed with carbs and cracked the carb in question (used JB weld to close it up) so i can't use the clear line method I have seen used.  Any help would be great thanks.

[adidasguy]

Gas can't leak out where the exhaust meets the engine unless the exhaust is not on correctly. That is supposed to be a tight seal.

Missing the exhaust gasket on that side? Exhaust not on tight?

Now, do you have spark? If no spark, carbs are not the issue.

[clowwarrior]

Yes there's spark first thing I checked, I have checked timing, shims, compression all fine.  As for the exhaust gasket yes it was missing thank you on that, I did not notice.  I will get the exhaust gasket and see if that helps.

[clowwarrior]

Okay so I got the new exhaust gaskets on no more fuel leaking out the exhaust manifolds but still won't fire on left cylinder and spark plug wet on that side,  took off carbs and tried to set float height, still same problem any more ideas?

[dry_humor]

Okay so I got the new exhaust gaskets on no more fuel leaking out the exhaust manifolds but still won't fire on left cylinder and spark plug wet on that side,  took off carbs and tried to set float height, still same problem any more ideas?

even if your coils are firing, your plugs may still be bad. did you try a bench sync before you put the carbs back on?

[weedahoe]

Okay so I got the new exhaust gaskets on no more fuel leaking out the exhaust manifolds but still won't fire on left cylinder and spark plug wet on that side,  took off carbs and tried to set float height, still same problem any more ideas?

Are you sure you have spark on that left side? You physically or visually verified spark on the plug right?

[clowwarrior]

Dry no I did not bench sync I will try that today, I assumed they where synced already and for spark plugs I switched them out with a fresh set and gapped them also switched them around from left to right cylinder.

Weed yes i pulled the spark plugs on both sides and verified sparks.

[BockinBboy]

Have you tried swapping your coils to see if the problem switches to the other cylinder?

- Bboy

[clowwarrior]

Okay tried bench sync got nothing then tried trading coil and nothing again.  Also used true syncing method let the bike warm up because it will run just no left cylinder firing.  Any more ideas?

[adidasguy]

Could be bad plug. Swap plugs or buy another one as a spare and swap.
Insure the cap is properly seated on the plug (remove the roundish cap thingy on  the plug to expose the threaded part if you haven't done that)
Insure the plug wire is screwed into the coil and the plug cap. They can get unscrewed - they just screw in.
Check again for spark. Then check the other side and see if the sparks look the same. If spark is OK then something more serious may be the problem.

Compression test? Simple one is just thumb over the spark plug hole. There should be really strong puffs of air being forced out under your thumb.

If carbs are off, you can look in at the valves and maybe see something wrong. Same for exhaust. It won't diagnose everything, but if there is a problem you can see then you found something. You can watch the valves go up and down as you crank the engine with a 19mm wrench on the timing rotor. Maybe the exhaust valve is not closing so the compression cycle is just shoving fuel out the exhaust port?

[clowwarrior]

Could be bad plug. Swap plugs or buy another one as a spare and swap.
Insure the cap is properly seated on the plug (remove the roundish cap thingy on  the plug to expose the threaded part if you haven't done that)
Insure the plug wire is screwed into the coil and the plug cap. They can get unscrewed - they just screw in.
Check again for spark. Then check the other side and see if the sparks look the same. If spark is OK then something more serious may be the problem.

Compression test? Simple one is just thumb over the spark plug hole. There should be really strong puffs of air being forced out under your thumb.

If carbs are off, you can look in at the valves and maybe see something wrong. Same for exhaust. It won't diagnose everything, but if there is a problem you can see then you found something. You can watch the valves go up and down as you crank the engine with a 19mm wrench on the timing rotor. Maybe the exhaust valve is not closing so the compression cycle is just shoving fuel out the exhaust port?

Compression test with bike warmed up is left 155ish right 150ish and as for spark plugs I've switch to new set and "old set" only had about 50 miles on them.  Sparks look the same went through and replaced with new caps and wires.

[clowwarrior]

Problem has been solved turned out that the pilot jet (according to my friend that helped me clean carbs when I first bought bike)that was "stuck" was actually lose when I decided to break down my carbs and see if I could figure it out. Just screwed the jet back in and the bike is running perfectly now, let the flaming of me begin!

[RossLH]

let the flaming of me begin!

Where'd you get that suit? At the.....toilet store?