Thoughts on running rough - VTXOA
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post #1 of 15 (permalink) Old 05-02-2019, 07:11 PM Thread Starter
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Thoughts on running rough

2008 1300T
Okay, when I bought this bike it ran like crap for the first 10 mins of any ride. Rough idle, stall, backfiring. Riding with the choke/enricher pulled partway out helped. I ended up swapping the KN air filter out and putting the stock filter in and this fixed the issue.

Since coming out of hibernation, this issue has somewhat returned, not as bad, not backfires. Iíve not ridden much this season yet, but I have run about 2 tanks of gas through it.

Today I rode to work. It was cool and damp today, I had to have the choke pulled about 1/4 of the way out for the first few miles.

After work, still cool and damp, but not as bad as in the morning. Started it with about 3/4 choke, after I got my gear on, I reduced that to 1/4 as per normal. Started riding out of town, and I needed to add more choke. It was almost fully out at one point. Under acceleration it was boggy, and backfiring. Got worse as the rpm got higher. My ride is about 30 mins, with 15 of that going through town. At one point I pulled over and noticed oil pushing out the filler cap. I checked the oil, level was good (recently change).

It eventually stopped, but that was about 5 mins from home.

Any thoughts? Iím leaning towards the carb but Iím not sure.


Sitting on my VTX making vroom vroom sounds.

https://www.hondashadow.net/forum/me...e71386-vtx.jpg

2006 Shadow Aero 750 (sold Oct 2018 )
2008 VTX1300T

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post #2 of 15 (permalink) Old 05-03-2019, 06:13 AM
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Cool

Carb needs cleaning, try non ethanol gas. that solbved my problems.
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post #3 of 15 (permalink) Old 05-03-2019, 07:12 AM Thread Starter
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Quote:
Originally Posted by steveroy60 View Post
Carb needs cleaning, try non ethanol gas. that solbved my problems.


I always run non-ethanol gas. Canít say what the POís did though.

Thanks, I just need to find time to take it apart.


Sitting on my VTX making vroom vroom sounds.

https://www.hondashadow.net/forum/me...e71386-vtx.jpg
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2006 Shadow Aero 750 (sold Oct 2018 )
2008 VTX1300T

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post #4 of 15 (permalink) Old 05-03-2019, 08:18 AM
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Test the petcock for fuel flow.
Examine vacuum hoses.
There have been a few issues.
You can also flip a spring in the vacuum diaphragm to the other side to make it a manual petcock function.
Info in the step by step board.
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Last edited by Hans&Feet; 05-03-2019 at 08:20 AM.
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post #5 of 15 (permalink) Old 05-03-2019, 02:18 PM
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I just read a post on FB about a guy that replaced all his Intake rubber boots & Vacuum lines..
He said it was like night & Day difference, faster throttle response, more power, smoother running by a long shot.... He went on to say that time & engine heat was probably the culprit in their demise!!!
Made a lot of sense to me....
No idea if this is your problem, but I would go with Petcock & fuel all the way into Carb and check all intake areas for possible leaks..
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post #6 of 15 (permalink) Old 05-04-2019, 08:23 AM Thread Starter
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I have a ride today that is important to me, so without digging to far into this yet, I decided to check the air filter and plugs.

Air filter looked good, gave it a cleaning, cleaned the air box and drained the lower tube.

Plugs, all four were replaced in the fall. Upper plugs on both cylinders looked rich. Black and sooty. Gave them a cleaning with a wire brush and put them back. The lower plugs both looked really good. Cleaner and not black.

Put some Seafoam in the tank too.

Havenít started it yet, Iíll check the battery cables before heading out. Wish me luck.


Sitting on my VTX making vroom vroom sounds.

https://www.hondashadow.net/forum/me...e71386-vtx.jpg

2006 Shadow Aero 750 (sold Oct 2018 )
2008 VTX1300T

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post #7 of 15 (permalink) Old 05-04-2019, 03:30 PM Thread Starter
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Okay. Met with my group about 30 miles from home. Bike ran as usual on the way there. Choke for a few miles, then closed for the rest of the trip. We were going to the Annual bike blessing at a local church and then for a 200 mile ride. So since the bike was running well, I stopped to top off the tank. Met the group at a coffee shop and hung out for a little over an hour.

Saddle up for the short ride to the church, and itís acting up all the way. Needed 1/2 choke to smooth it out. I stayed for the blessing and then just headed home to be safe.

The engine seems very hot. The chrome cap on the oil dipstick is too hot to touch.

I put my inline spark tester on, all plugs firing.

I drained the tank, and removed it.

Gas lines and vacuum lines all look good, but I think Iíll replace them.

Removed air box, all clean, no critters.

Started to remove the carb, I think Iíll need to read up some before messing with it too much. Lots of stuff connected to it.

Took the diaphragm out of the top of the carb and inspected it. Put a flashlight on the opposite side and looked for holes. Didnít see any. Cleaned the needle and put it back. Cleaned some soot out of the carb.

Checked my exhaust bolts. All were loose. I canít get at the bottom front one very well, but tightened it as well as I could. Each one took almost a full turn with the socket wrench.

Put everything back together, until I can get the new lines and read up on removing the carb. I think Iíll drain and replace the coolant as well.


Sitting on my VTX making vroom vroom sounds.

https://www.hondashadow.net/forum/me...e71386-vtx.jpg
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2006 Shadow Aero 750 (sold Oct 2018 )
2008 VTX1300T

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post #8 of 15 (permalink) Old 05-04-2019, 06:39 PM
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My money is in the petcock. Do yourself a favor and get rid of that vacuum actuated POS. I had similar intermittent issues. Petcock solved it for good.

https://www.denniskirk.com/pingel/po...prd/184301.sku
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post #9 of 15 (permalink) Old 05-05-2019, 12:57 PM Thread Starter
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And today she ran like a dream.


Sitting on my VTX making vroom vroom sounds.

https://www.hondashadow.net/forum/me...e71386-vtx.jpg
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2006 Shadow Aero 750 (sold Oct 2018 )
2008 VTX1300T

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post #10 of 15 (permalink) Old 05-10-2019, 05:47 PM
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Never, EVER ride with the choke out even a little bit. If your bike only runs good that way, FIX IT as you're only making it worse.

Second, Non-ethanol gas has NOTHING to do with it. It's all we have here in Northern Illinois and all our stuff runs like a top on it

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