Runabilty problems in MI - VTXOA
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post #1 of 9 (permalink) Old 04-12-2019, 07:35 AM Thread Starter
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Runabilty problems in MI

Hey all,

Last summer I picked up a completely stock '05 1300 S for the wife, less than 3500 miles and hadn't been ridden in a while. I put a new set of plugs in it, along with draining the tank of the old gas and mixing Seafoam in with the new. Never got it on the road as life got in the way.

Early last month I started getting it ready and it ran terribly. Problems with idling, an occasional backfire, it wanted to die (or would die) if I tried to rev the engine. As it had sat a while before I bought and then after, I removed the carb, did a complete disassembly, a through Ultrasonic cleaning (that revealed a clogged slow speed jet) and then reassembled using all new gaskets. Fired it up last evening and she started right up on half choke from cold. Let her warm up and made little adjustments to idle speed along the way, but it is still dying if I try to give it any throttle at all and it did backfire a couple of times.

At this point I'm stumped, my 1800c has never given me problems as it's fuel injected. If I can get it running halfway decent, I'm going to plate it and ride it myself for a while running heavy dosages of Seafoam in each tank to help clean out all the years of build up from not being used.

TIA,
Fred

2003 1800c
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post #2 of 9 (permalink) Old 04-12-2019, 09:51 AM
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How is the fuel flow from the petcock??
Vacuum hoses usually crack on the ID so check and/or replace.
The accelerator pump gives it a shot of fuel when twisted quickly, is it working?

On the carb fuel hose bib there is a small filter in there, did you take it out?
Pix and text from Mr VTX https://www.vtxoa.com/forums/7-vtx-1...ing-101-a.html
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[B]2005 1300c Red, Mustang seat, HK 2.5 straights. Leds for safety-front & back. 190,260 VTX miles
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post #3 of 9 (permalink) Old 04-12-2019, 01:18 PM Thread Starter
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Hans,

Thanks for the response.
I will presume that I have good flow through the petcock as the bike started on the second try after I reinstalled the dry carb on it, but I will verify flow through both the On and Res positions.
Accelerator pump gives a health shot of fuel when called on, and yes, I did remove the small filter screen from the hose bib, cleaned it and reinstalled it.

Given the age of the bike, a bad vacuum line is a real possibility, so I guess I'll start going through those this evening.
I used the post from Mr VTX along with the service manual as my guides through the process!

Fred

2003 1800c
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post #4 of 9 (permalink) Old 04-12-2019, 02:23 PM
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How about the slide valve diaphragm?
Does Vacuum port line up?

On a different tangent the 1300 ICM wires are short.
Many a Green or Black wire has broken (the two wires nearest the fuel tank)
When the wire is broken and is intermittent they are many backfires. The vibration causes it to go open.
Check the wires right at the connector, wire insulation may neck down a bit.
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File Type: jpg 1300 ICM wire break Jasonnn.jpg (156.4 KB, 5 views)

[B]2005 1300c Red, Mustang seat, HK 2.5 straights. Leds for safety-front & back. 190,260 VTX miles

Last edited by Hans&Feet; 04-12-2019 at 02:31 PM.
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post #5 of 9 (permalink) Old 04-12-2019, 03:49 PM
bdm
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Maybe try a can of Sea Foam i use it all the time




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post #6 of 9 (permalink) Old 04-12-2019, 04:16 PM
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I would examine the slide diaphragm closely and make sure it’s installed correctly
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post #7 of 9 (permalink) Old 04-14-2019, 05:02 PM Thread Starter
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Thanks for all the ideas, here what I can report back so far:

The slide diaphragm is in great shape and works smoothly.
The wiring harness to the ICM also looks to be in good shape. The insulation is a constant diameter with no checking or cracking.

The only thing I havenít been able to get completed is a through check of all the vacuum lines. And the more I think about it, the more I think that this will ultimately be the root cause of the issue.

Fred

2003 1800c
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post #8 of 9 (permalink) Old Yesterday, 10:02 PM Thread Starter
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I found the vacuum leak!! There was a pinhole in the main breather tube coming off of the air box. Once that was plugged, she idles smooth and roars to life with the snap of the throttle.

Now I can finish up the dos and ends and put on the road.

Thanks for the assistance!

Fred
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2003 1800c
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post #9 of 9 (permalink) Old Yesterday, 10:20 PM
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There is NO vacuum hose on the OEM airbox
Crankcase vent hose and air to the PAIR valve.
Do you have something aftermarket like Hypercharger? Their rubber hoses are know to break off.

[B]2005 1300c Red, Mustang seat, HK 2.5 straights. Leds for safety-front & back. 190,260 VTX miles
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