Little bit stumped looking for a few ideas

iceteanolemon · Apr 1, 2013

BillT said:
I also think its fuel. If you look at the fuel cap, you'll see a little hole on the ridge of the metal disk that holds the rubber gasket. That hole and ridge are the vent for the tank. There's a hole on the top of that disk, 180 degrees from the bottom hole on that same ridge. A common occurrence is that vent path gets blocked, either by varnish or by rust, and air doesn't come into the tank to replace the fuel consumed.

You may notice you can go further on a half tank before issues than a full tank (more air in the tank, so vacuum builds up more slowly), or that you can go further at slower speeds than high speed (slower fuel consumption also means vacuum builds up more slowly).

Try cleaning out that vent ridge with a wire (single wire strand off a broken cable works pretty well) and some compressed air. Also check the filter screens on the fuel taps and inside the banjo on your carb

I drilled out the original rivet on my cap to better clean the disk, then tapped the post for re-attaching the disk with a screw.

Yeah I am a little all over the place since still looking for the issue. I did clear the lid vent and blow some air through it for good measure. I will pull the fuel lines today and check the fuel filter as well. I am trying not to do too much for each test ride. I want to fully isolate the issue.

I don't feel I have enough data to isolate it to fuel or spark at the moment, I will just need a tiny bit more evidence to go one way or the other. These issues are always the fun ones

Weird thing is that I can ride for miles with no issue at all, lots of power and everything.

iceteanolemon · Apr 1, 2013

OK I did some more messing around today and I may be falling in the fuel camp for sure.

Took the bike out to a grade with the tank almost empty. After about 1.5 miles of 4k running the bike did the bog missing thing again. I then took the bike back to the gas station and filled it up. After filling the tank I was able to do about 30 miles without ever a miss.

I think now I need to research the fuel flow situation. Hopefully its not too big of a deal.

Sound about right?

comnoz · Apr 1, 2013

iceteanolemon said:
OK I did some more messing around today and I may be falling in the fuel camp for sure.

Took the bike out to a grade with the tank almost empty. After about 1.5 miles of 4k running the bike did the bog missing thing again. I then took the bike back to the gas station and filled it up. After filling the tank I was able to do about 30 miles without ever a miss.

I think now I need to research the fuel flow situation. Hopefully its not too big of a deal.

Sound about right?

Yep>

Hobot · Apr 1, 2013

A mean joke played on riders was to drop a rag in tank, started up fine but after a while stopped, miserable examinations, then starts again ... I had this happen to Peel when a big moth got in tank somehow. There is an Amal fuel flow restriction past the float needle and a slot cut to bypass it, though usually need long held hi throttle to show up. I've had broken copper inside insulation that sagged with heat to cut out but fine soon as cooled a bit.

iceteanolemon · Apr 1, 2013

I pulled the lines and the pingel fuel filter for inspection. Lines were clear and the fuel filter had a tiny bit of lint in it. Blew it out and ran the petcocks into a gas can to test. Saw a slow even stream from each so it's not blocking. I may have a restriction to the flow with the copper adapters I fitted to mate the petcock to the fuel line. I don't like them at all, maybe I need to find a better product than what I have.

Anyone have a trick quick disconnect or double breaded high flow elbow cool kid thing to fit the gas line to the petcock??

That damn pingel fuel filter is soo trick. Definitely overkill for what it is.

rpatton · Apr 1, 2013

Still sounds like fuel, but if you still had suspicions about the ignition, then you might try hooking it up with temporary jumpers. That would be power and ground to both to the module and the coil. Bypass everything from the fuse on.

Check out the elbow on this page. Is that what you mean?

http://www.rockypointcycle.com/p-2940.html

G-Force · Apr 3, 2013

Are you running 1 main fuel tap and one reserve, am thinking 19 tooth sprocket and highway speeds that a single tap may not be enough, I've never bothered with a reserve tap so I get a better/even fuel flow, have you tries turning both on? good luck, kepp perservering, at least you're making it home without the trailer

1up3down · Apr 3, 2013

I've never bothered with a reserve tap so I get a better/even fuel flow, have you tries turning both on?

me too, I run with both petcocks open to ensure strong fuel supply to carbs

you have filters inside the tank attached to the petcocks, and you say you also run an inline fuel filter that could well be restricting flow

today's gas is pretty clean and your petcock filters keep most everything clean

try running with both fuel taps open and remove the inlne fuel filter, my guess is problem solved

iceteanolemon · Apr 3, 2013

I did a little housekeeping on the filters and also filled the tank all the way up. Now with a full tank of gas and one petcock on I had no issues on a 50mile ride. I hate to change so much as I like to find the exact cause but I wanted to get riding so I know it havd to be one of many things that made my ride work out this time hahah...

I didnt however ride with both petcocks on last time. I did try it other times thoug but with a almost empty tank both petcocks on didnt help. That earlier lead me to think it was electrical.

Gremlins perhaps!

I need one of those stupid bells.

Little bit stumped looking for a few ideas

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