92C intermittent miss at constant RPMs - Victory Forums - Victory Motorcycle Forum
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post #1 of 22 (permalink) Old 09-07-2013, 10:04 AM Thread Starter
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Default 92C intermittent miss at constant RPMs

I have a 1999 V92C (DAZ). A few weeks ago it was running rough and at one point the engine was bogging down and miss-firing at about 2500 RPMs (60 MPH on highway). I pulled the plugs and they looked a bit gunky so I replaced them. After about a 100 miles it happened again again on the highway at a constant rate of speed. If I pull the clutch in and rev it up to about 4,000 RPMs it will settle back down.

I'm going to pull the tank and check the Throttle Body and the idle advance cable as it has gone slack since changing the plugs. It almost acts as if it is experiencing a vapor lock, is that possible? Is there anything else I should check, clean or replace while I have the tank and air box off.

Thanks in advance.

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post #2 of 22 (permalink) Old 09-07-2013, 11:08 AM
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Cleaning the throttle body dose wonders, when my TC starts missing I clean the throttle body, change plugs and clean the air filter the miss goes away every time. I've noticed since I started running 87 octane my plugs stay cleaner way longer too.

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post #3 of 22 (permalink) Old 09-07-2013, 12:54 PM
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here is a video on cleaning. you might need to do this once a year. Check battery cable to make sure there tight

http://buywitchdoctors.com/articles/...ictory-sc-598/

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post #4 of 22 (permalink) Old 09-07-2013, 09:11 PM
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Check to make sure the tank's vent line is clear-I've seen them get melted or pinched and cause similar issues. Also- there are prefilters in the tanks two outlets that need to be pulled & cleaned. If it's a hiccup/momentary skip while cruising at a steady RPM you need a new TPS. You can get one at any auto part store- GM part #17123852 or AC Delco 213-912 if your a Ford guy.
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post #5 of 22 (permalink) Old 09-08-2013, 04:25 PM Thread Starter
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Default Update and questions...

I replaced the TPS last season, it should still be good. I have cleaned the throttle body, air filter and plugs. As I had stated above, the advance idle cable is snapped. I noticed that this cable does not spring back to closed when the cable gets slack. In other words if the cable snapped while idle was advanced, it stayed there. This would account for the fouled plugs and dirty TB.

My question is... what is the off position of the idle advance at the Throttle Bod? Where the IA cable attaches to the TB it would appear the "wheel" would spin far beyond the point where the butterflies close. Does the IA cable just open the butterflies or are there other valves/settings opening? If I just rotate it back to till the butterflies close is it disengaged?

I'd like to put it back together and burn out any carbon residue that might have gotten in when cleaning the TB. Run it for a bit then when the new cable comes in tear it down and put in new plugs and the cable.I DO NOT WANT TO DO ANY HARM.

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post #6 of 22 (permalink) Old 09-08-2013, 05:48 PM
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The idle cable only moves the butterflies, overcoming the spring tension of the throttle-in its off position they should be closed. If this cable broke the spring tension on the throttle control should close the butterflies. Does your throttle snap closed when you twist and release the grip? If it does I'd say your OK to ride-if not you have some work to do.I have all the slack adjusted out of my IA cable and use the lever as a cruise control. There's supposed to be 1/8-1/4 inch of free play at the lever according to the manual..
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post #7 of 22 (permalink) Old 09-08-2013, 06:12 PM
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Holy crap that's the dirtiest T.B I've ever seen. I wonder if you may have an injector plugged up or one going bad.

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post #8 of 22 (permalink) Old 09-08-2013, 06:15 PM Thread Starter
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I do have normal movement in the throttle cables.

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post #9 of 22 (permalink) Old 09-08-2013, 06:17 PM Thread Starter
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Quote:
Originally Posted by saintdruss13 View Post
Holy crap that's the dirtiest T.B I've ever seen. I wonder if you may have an injector plugged up or one going bad.
Hmmm. is there an easy way to check that? Besides my plan A... reassemble, run it up to temp disassemble and replace IA cable and plugs.

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post #10 of 22 (permalink) Old 09-08-2013, 08:43 PM
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If you haven't ran it yet after cleaning the T.B then I wouldn't worry about anything yet, it will probably run like it did in 99.

Captain Spalding's Fried chicken and gasoline. * EXIT 13 OFF ROUT 1 at RUGGSVILLE*

2004 TC, 05 Vegas 8Ball, 09 Yamaha FZ6R
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