Popping / backfire 1200c

Thank you. Much appreciated.

Have you tried pulling a vacuum check on your line. with a hand vacuum pump? Mine was acting like that, when I tested it I couldn't pull a vacuum.It was my voes leaking.I was losing vacuum and had no spark advance. Made a big difference fixing that.

Ken,

Thanks for the trouble code info,, I checked,, all clear.

I also installed the new needle you sent,,
didn't change.

However,, through this entire thing,, I've neglected
to check float level! Ok, yes I know,, basic thing I
shoulda checked,,,
It acts like it's running out if fuel,, doesn't want
to leave from a stop light,, spits and misses
at constant cruze.
I replaced the petcock,, could float level be it?
Only thing is it seems much worse in hot weather.
Rode the other day in 95 degrees and had to
take it home, just wouldn't run!!

Ideas?

Curtis

OK, .. just got back from riding, .. runs 1,000X better !!! still needs some minor tweeking
but at least now it's ridable!

What did I find?, .. well, every time I've had the carb off, .. I left the choke cable attached
to the carb, .. and when I put it back on I routed the choke cable OVER
the wires for the MAP sensor.
The choke cable would pull down on the MAP sensor wires and make it leak around
it's little rubber seal.
Once I fixed that, .. much better.

I also installed the 2003 needle that you sent Ken, that did seem to help too.

Bike runs good, .. but there are still some minor issues.
It still is a little "sensitive" leaving a light, it did pop and stall once.
It still doesn't want to take throttle from an idle after it gets warm.
it's not nearly as bad as it was but it still has a minor issue.

I've got the lowspeed adjustment out about 3 turns, .. I turned it in
and the bike didn't start to stumble till it was all the way seated.

part throttle riding, 35, 45 etc, smooth as silk ! so if I can fix the off idle
hesitation it will be perfect !!!

Ken, any idea where I go from here?

Curtis

Glad to hear you are on the road to success with your issues. Quick question, did you have any difficulties getting your CVP EZ mixture screw to thread in? My stock mixture screw threads in and out fine, but the supplied EZ just screw seems to bind up after about 3-4 turns in. Is it just the cut of the threads so it does not fall out? I don't want to force it, but it seems to want more persuasion than I feel comfortable to give. And yes, the threads look excellent.

Roadster guy, .. yes mine also had the threads a little "tight" but nothing that didn't
feel correct. I would assume the threads should be a little tight.

Also on my deal, .. the carb mounting plate the bolts to the heads, ...
the two "lugs" where it attaches to the head, .. I ground about 1/8" off of to
pull the carb into the manifold tighter.

Curtis

Have you tried checking the voes . (vacuum operated electric switch)

didn't know it had one, ... where is it located on a 2004 xl?

I think somewhere on this thread someone mentioned that the VOES is on pre 2004 sportsters and in 2004 they went with a different system using a MAP sensor, seems to ring a bell with something I read on this forum...

Cboggs, question, do you know if a velocity stack would benefit my riding style? 2000-3000RPMs mostly, usually in town or country roads, with a zip up to 5000rpm once in a blue moon. I'm thinking my driving style is too old to benefit from one, but if it smooths out airflow and gives torque at the bottom end I may have to try one. I see by your listed occupation you may have an opinion.

YEP, no VOES on that bike. I am thinking that this is the same thing that is happening with my bike. (The FLTR).

My MAP sensor is very loose in the bracket, .. it can be pushed side to side
and does have a leak when I do that, ..

Replace the gasket?