Engine Not firing, suspected carb issue

Ripped the carbs off, cleaned (again) nothing notable in terms of cleaning. Stuck em back on, and same deal, minus the overflow. All needles/needlejets/jets clean, all holes clean, all ports clean, floats all seal, all levels correct... I just saw a video of static timing and I guess I did it wrong. Time to check that out again... ugh. stupid me!

It's firing, so I know this is just a timing issue now. I rotate the crank, and it fires when I have the test light setup. I have it static timed to the "F" mark, but I don't think that's right... I've got the dyna s ignition an dyna coils (3 ohm). It says to static time to 1/2" of the "F" mark not sure exactly where I should be timing it to... Any suggestions? Thanks!

emptypond wrote: It's firing, so I know this is just a timing issue now. I rotate the crank, and it fires when I have the test light setup. I have it static timed to the "F" mark, but I don't think that's right... I've got the dyna s ignition an dyna coils (3 ohm). It says to static time to 1/2" of the "F" mark not sure exactly where I should be timing it to... Any suggestions? Thanks!

The timing marks are shown differently among the various advancers.

Be certain of properly identifying the "F mark."
It's the hash mark, which may not exactly coincide with the letter F.

Here are some examples:




Good Fortune!

As others have noted, the coils must be wired correctly and attached to the proper spark plugs.





Perhaps the cam timing is off a tooth?

Good Fortune!

I checked cam timing and set it exactly per the manual, so I'm 99.9% sure the cam timing is ok. The coils are definitely wired correctly, as when static timing, the proper circuits are completed. There is a slight possibility the cams could be off, but like I said, I triple checked that when re-installing them. I'll fart around with it and see what happens. Thanks Patton!

So I've checked everything, and the engine fires, runs for a bit, then dies out. I'm not sure where to go from here, as the engine didn't get warmed up enough to check anything before it died out. Any suggestions?

Would double-check valve clearances to be sure they are within spec, and especially not too tight, because insufficient clearance may allow the valves to close when the engine's cold, but then fail to close and allow compression loss as the engine warms.

Another possibility could be fuel starvation.

Good Fortune!

I checked valve clearances, cam shaft location, all checked out. This seems like a fuel starvation issue. I checked the intake manifold carburetor mounts, and those actually were leaking at the intake side of the mount. I fixed that, but probably need new ones. Other than that my petcock on my tank drips a hair when in "on" position. I've got spark in all four cylinders, but only #2 was firing, as the exhaust was warm on that cylinder only. This is quite frustrating.

It's a weird issue, because I was not able to start with choke on, as the bike needed air. It also seemed to be backfiring through the carbs. I'm thinking maybe the jetting is too much for this? I've ordered 120 and 122 mains, with all the rest stock. Maybe I need to shim the needles as well, but I'll go back to stock, and see what happens with that first, and I'm almost certain this is a sole carb issue now.

just a shot in the dark your timing advancer is not put together 180* apart is it?

No, I didn't take the advance assembly apart, besides to put the dyna rotor on. I did that back when the bike was in pieces, so I suppose it wouldn't hurt to check it again.

Dyna Rotor? Which ignition are you running? When 1-4 are at TDC, the rotor should point to the left/ rear.
Use a timing light to verify the spark on 1-4 happens when 1-4 mark is at "F"