yet another issue... rough running.

[dstroy12]

Hey guys!

You all have helped me a ton. But again I have a problem... had an electrical issue which turned out to be a battery issue. Now. She fires up fine! First couple rides were great. Only like 30 minutes but ripped! Now I just ran her. 30 minutes everything is ok. Then ill slow down and stop at a light. Then she runs rough. Idle lowers. Give it a crack of throttle and everything is fine. Take off and ride. Next light. Same thing.

I've replaced about everypart in the carbs, synced and all good. Checked the enrichment circuit - fine. Checked grounds - perfect. Fuses and connections - all good.

I just don't get it. Over heating? Its almost like one it gets warm it runs worse. I live in chicago. Its cold enough. Lol

Thanks!

P.s. I don't know how to add this.
1983 heritage special - hard tailed, xs pods, ngk iridium plugs, biltwell seat. Lc fab p-nut tank. Ultimate coil just can't find a place to install it!

 

[cros36]

you sure the new battery is good? is it good under load? are you still using stock coils? what kind of ignition system?

 

[dstroy12]

Yeah tested and all...stock coils and stock tci ign.

 

[dstroy12]

maybe the coil? over heating?

 

[littlebill31]

Stupid question, but did you check where the idle is set?

 

[dstroy12]

Not a stupid question. but yes. I did, that was one of my issues a month ago.

 

[grizld1]

What you're describing is consistent with fuel level that's too high (float level too low). Here's a test you can use. Get going at a pretty good clip in 2nd, slip the tranny into neutral, let rpm's settle, then brake aggressively to a stop. If the engine stalls or rpm's drop sharply, raise the float level 1/2 mm. (.020") and see if that improves things.

 

[dstroy12]

No stall but a little hanging in the idle....

I never did adjust the float height... should I consider it? I have a 145 main and a 45 pilot. Xs pods and chopped stock exhuast

 

[cros36]

yes consider it. and be very precise when doing it. measure both bulbs for consistency.

 

[littlebill31]

The floats are one of the most important measurements. They what regulate fuel flow to the carbs.
It has to be +/- 1mm, so you can see it's precise measurement. Too much fuel and they'll flood, too little and they will starve the engine.

 

[XSLeo]

Could be poor charging. The TCI is very voltage sensitive.
What are the battery voltages at idle and 2500 rpms? Idle around 12.5 to 13 volts, 2500-14.5?
Same cold as after a 30 minute ride. I have a rotor that checks out ok at room temp, ohms go up to around 9 ohms after about a half hour of running. Check it both cold and after a good long run.
Leo