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Old 11-27-2012, 05:55 PM   #1 (permalink)
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78 panther bog

Hey guys, I have a bog as if the sled was being held back and cant move. If I feather through it tends to power through it. Whats causing this because it sucks when trying to get up a hill. Things I've done:

-carb rebuild (stock jetting)

-fuel pump rebuild

-Tore motor down new seals and gaskets

-Cleaned clutch

-Track spins freely

-New belt

-New plugs

I'm going to try dropping main jet down because I do have wet plugs and wet inside exhaust manifold. The weird thing is that the bog isn't always there, but often enough to cause grief. Any ideas? Thanks
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Old 11-27-2012, 07:18 PM   #2 (permalink)
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in my experience bog is caused by too much gas in the gas/air mix. i know nothing about AC sleds, so google how to adjust the carb(s) to adjust gas/air ratio. when doing this, after each adjustment and 15 or so miles make sure the plugs dont turn white. if they do you are getting too much air and will blow your motor.
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Old 11-27-2012, 08:54 PM   #3 (permalink)
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Thats what Im leaning towards too. The only thing that makes me curious is that the bog isn't always there. Sometimes it revs and moves great. Others its a slug of the line. Once its moving its ok.
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Old 11-27-2012, 11:34 PM   #4 (permalink)
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Check to make sure the fuel enrichment plunger (choke) is not getting stuck. I had this happen on my 80 panther.
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Old 11-27-2012, 11:38 PM   #5 (permalink)
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I did have the plunger off and cleaned. I also loosened the cable to the point that I need to pull on it a hair to start the sled just to make sure.
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Old 11-28-2012, 06:38 AM   #6 (permalink)
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Have you checked the clutches?
An intermittent problem such as you describe can also be caused by dirty/sticking/worn clutches.
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1980 AC Pantera (donor engine to the 90 wildcat)


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Old 11-28-2012, 07:33 AM   #7 (permalink)
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Clutches were just cleaned and seem to be functioning properly.
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Old 11-28-2012, 09:22 AM   #8 (permalink)
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Is the belt riding up where it should on the secondary?
Is there any belt line on either unit?

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Old Cat Rider
'93 Wildcat 700EFI
w/ Comet 108 Pro-4 clutch & 01 ZR skid

'90 Wildcat Project in progress.

Vintage (sorta)
1980 Indy Trail 440 (for sale)
1980 AC Pantera (donor engine to the 90 wildcat)


http://www.dcdrifters.net/


Worshipful Master; F&AM Dryden Lodge# 472
http://www.masonicdryden472.org/

Rules of this forum are strictly enforced!
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Old 11-28-2012, 09:38 AM   #9 (permalink)
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The belt is flush with the top of the secondary (new belt). No lines on clutches.
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Old 11-28-2012, 03:02 PM   #10 (permalink)
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Belt should actually be 1/8" out of the sheaves.
Do you still have the Artco Hex clutch on that sled?
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Old Cat Rider
'93 Wildcat 700EFI
w/ Comet 108 Pro-4 clutch & 01 ZR skid

'90 Wildcat Project in progress.

Vintage (sorta)
1980 Indy Trail 440 (for sale)
1980 AC Pantera (donor engine to the 90 wildcat)


http://www.dcdrifters.net/


Worshipful Master; F&AM Dryden Lodge# 472
http://www.masonicdryden472.org/

Rules of this forum are strictly enforced!
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Old 11-28-2012, 03:45 PM   #11 (permalink)
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That's right. Thanks RJ I remember reading about the 1/8" height now. Ill try that too. Yes original hex clutch too.
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Old 11-29-2012, 09:14 AM   #12 (permalink)
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Ok, those clutches have the problem of the weight arms with rollers getting sideways and binding/breaking off.
Make sure that this is not the case and that the center bushing [fiber] is not worn and sloppy. These can be fixed/replaced as parts are still available.
However, replacing that clutch with a newer one will afford even better tuning capability.
I have a Comet 102C on an 80 Pantera [500 fan] which makes it capable of running with 600 l/c sleds all day long.
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Old Cat Rider
'93 Wildcat 700EFI
w/ Comet 108 Pro-4 clutch & 01 ZR skid

'90 Wildcat Project in progress.

Vintage (sorta)
1980 Indy Trail 440 (for sale)
1980 AC Pantera (donor engine to the 90 wildcat)


http://www.dcdrifters.net/


Worshipful Master; F&AM Dryden Lodge# 472
http://www.masonicdryden472.org/

Rules of this forum are strictly enforced!
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Old 11-29-2012, 09:22 AM   #13 (permalink)
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Everything seemed good when I took it apart to clean and inspect. The bushing probably could have been replaced while I had it apart. Ill check into a comet if my problem is solved with adjusting the belt height and leaning my jetting. Need more time in a day. Haven't had a chance to play with it lately.
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