Tearing Hair Out

[mcycle-nut]

Ok, my 750 is running like a bag, of, you know what. It starts up fine, when accelerating away, pops, farts, misses and sounds like an old WW1 biplane. As long as you're on the gas, it seems ok, once it "cleans up." If I'm putting around town, it starts to load up again, doing the pop and fart thing. It seemed to smell gassy when parked in the garage after a ride, but after a day or so, no more. It always has, but more so now. I thought it might have something to do with running pods. Fuel mileage sucks now. These problems seem to have appeared overnight.

When I pulled the carbs, there was gas in the intake tracts. I suspected needle and seats. Ok, bought new ones. Dissasembled carbs. They were hospital like clean, except for a little bit of sediment in the bowls. Blew compressed air though all the passages just for yucks. Checked floats for bouancy. Re-assembled carbs with new needles and seats, set float height. Cleaned air filters, synced carbs. NO DIFFERENCE!!!! WHAT THE HELL IS GOING ON!!!!!!

[bwringer]

Sounds like you're running way lean, which is fairly typical after going from airbox to pods.

What's your main jet size? How do the needles look? What slot is the needle clip in? Are the jets and needles stock?

If you replaced the jets and needles with parts from a kit, be aware that the aftermarket kits often (usually) contain different size jets than the parts you need.

[earlfor]

Re: Tearing Hair Out

Kev, I would do two things before any further head scratching.
Check compression and check valve clearances.

Earl

NO DIFFERENCE!!!! WHAT THE HELL IS GOING ON!!!!!!

[gremlin]

i am taking it you have a points system. your cap. are braking down. thats the two little metal cans atached to your points.

i bet you have one going.

[Hoomgar]

Kevin, are you sure your not sucking air in somewhere your not supposed to? Maybe cracked lines or a bad carb boot?

[mcycle-nut]

Thanks guys, it gives me something to try. What bugs me is how it happened literally overnight. I've been running this system for YEARS, Boyer Bransden electonic ignition, pods, Jardine 4 into one exhaust system. The carbs have 112.5 mains, and a 5DL36 needle in the 4th groove, counting from the top. I'll check things out when I have a nice day. I've got too many bikes in the garage to even work on anything! :roll:

[KEITH KRAUSE]

I'm thinking poor spark to at least one cylinder, probably two.
Have you taken any plug reads when it's having this problem?

[crc1214]

Yeah, I'm thinking points too. They may need cleaned a bit and gapped correctly. They may also just be worn out and need replaced all-together. Make sure the timing is set ok as well.

Also...... is your battery going bad? Don't assume just because it reads 12.6 or 12.5 it's good. Have it load-tested at Auto-Zone or the like for free just to be sure.


Chad
Columbus, OH 1978 GS550E

[Anonymous]

I had a Bransden system fitted,was never awfully happy with it.Over time it started developing the same symptoms that you describe.Thinking that leccy ignition is "fit & forget" I thought it was the carbs,stripping,cleaning and balancing time and time again,until one day BANG!Puff of evil smelling blue smoke and no ignition!Took both coils out as well! :twisted: :twisted: :twisted: If you still have a points assembly try it out and see what happens.