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Old 05-06-2010, 12:40 PM
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jmnjrpa jmnjrpa is offline
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Hiccup at idle speed

Have this for some time. Really noticed that the #4 cylinder is not backfiring but is expelling gas (as in air) back out the pod filter yesterday. Went for a ride around the block to test my speedo and felt it against my leg (was wearing shorts-yeah I had a helmet on). This happens cold or hot and is irregular and only at idle speeds without any load. It runs like a scalded dog and there is no backfire or ignition of unburned gas in pipes. Any ideas?
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'81 1100 MNS - "Midnight XSpress"
Original except:
120 mains outer cylinders - 125 mains inner cylinders - Ceramic headers - Powder coated pipes, covers calipers, and MC's
4 pods - Air box gutted--E3 Plugs - High Back seat - Grooved out swing arm - SS brake lines
Fork brace - 160 speedo - Auto CCT
All gold paint and chrome replaced with GOLD plate

"STUPID is Forever" Ron White.
Contact me by PM -I don't deal with stupid anymore.

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  #2  
Old 05-06-2010, 12:45 PM
motoman motoman is offline
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Possible #4 intake valve shim a bit much not allowing valve to completey close tight, but not noticable at higher rpms? Just a thought......
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81H Venturer1100 "The Bentley" (on steroids) 97 Yamaha YZ250(age reducer) 92 Honda ST1100 "Twisty"(touring rocket) Age is relative to the number of seconds counted 'airing' out an 85ft. table-top.
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Old 05-06-2010, 01:16 PM
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Winterhawk Winterhawk is offline
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I finally adjusted my valves after 4 years and found 3 tight valves. I did a leakage test and it was good, only with some leakage around the rings. My compression was 90 on #4 before the valve adjustment and 150psi after.
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  #4  
Old 05-06-2010, 01:50 PM
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tinman905 tinman905 is offline
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Had the same problem with the same carb when I bought my bike. In my case it was a bent idle screw tip and found a second rubber "O-ring" in there. I took the carbs off checked all the idle screws and had a good look for a stuck "o-ring" . Worked fine after that.
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  #5  
Old 05-06-2010, 02:46 PM
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jmnjrpa jmnjrpa is offline
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Thanks, will check!

I had done the valves and carbs last year. I am pretty sure the carbs are fine but there is the probability that I set the shims too tight. I did the work prior becoming a member and am fairly certain I set them close before finding out loose is better. What is the chance of carbon buildup creating this issue?
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'81 1100 MNS - "Midnight XSpress"
Original except:
120 mains outer cylinders - 125 mains inner cylinders - Ceramic headers - Powder coated pipes, covers calipers, and MC's
4 pods - Air box gutted--E3 Plugs - High Back seat - Grooved out swing arm - SS brake lines
Fork brace - 160 speedo - Auto CCT
All gold paint and chrome replaced with GOLD plate

"STUPID is Forever" Ron White.
Contact me by PM -I don't deal with stupid anymore.

Big John
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  #6  
Old 05-06-2010, 03:30 PM
motoman motoman is offline
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Carbon build up could be a possibility if it runnin' extremely rich for some time but IMO unlikely as I don't gather from any of your older post that you "lug" it around or that has been a issue prior. Think we're all just throwing out some possible causes at this point.
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81H Venturer1100 "The Bentley" (on steroids) 97 Yamaha YZ250(age reducer) 92 Honda ST1100 "Twisty"(touring rocket) Age is relative to the number of seconds counted 'airing' out an 85ft. table-top.
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  #7  
Old 05-06-2010, 03:38 PM
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jmnjrpa jmnjrpa is offline
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Yeah you're right,

Only remember 1 hardley ever passed me! I didn't want to dump my passenger (newbie) but it sure was hard letting him go!
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'81 1100 MNS - "Midnight XSpress"
Original except:
120 mains outer cylinders - 125 mains inner cylinders - Ceramic headers - Powder coated pipes, covers calipers, and MC's
4 pods - Air box gutted--E3 Plugs - High Back seat - Grooved out swing arm - SS brake lines
Fork brace - 160 speedo - Auto CCT
All gold paint and chrome replaced with GOLD plate

"STUPID is Forever" Ron White.
Contact me by PM -I don't deal with stupid anymore.

Big John
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  #8  
Old 05-06-2010, 04:15 PM
motoman motoman is offline
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LOL.....can tell you haven't forgot that incident!
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81H Venturer1100 "The Bentley" (on steroids) 97 Yamaha YZ250(age reducer) 92 Honda ST1100 "Twisty"(touring rocket) Age is relative to the number of seconds counted 'airing' out an 85ft. table-top.
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  #9  
Old 05-07-2010, 09:45 AM
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skids skids is offline
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Bad exhaust systems can make that happen at certain rpms. It will turn the carb black inside as well...
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Down to two 1978 E's. Both stock air boxes with K&N filters, one with 81H pipes and carbs,
One with Jardine 4-1 pipes. 8500 feet elevation.
03 Honda ST1300 ABS
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  #10  
Old 05-07-2010, 03:39 PM
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jmnjrpa jmnjrpa is offline
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Thanks Skids,

But bad as in holes? Blasted these and they looked very good. Just ceramic coated em' and installed with new gaskets and can't be certian but they appear even in back pressure. Almost positive that the hiccup is only #4.
No discoloration in carbs (running pods so was easy to check).
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'81 1100 MNS - "Midnight XSpress"
Original except:
120 mains outer cylinders - 125 mains inner cylinders - Ceramic headers - Powder coated pipes, covers calipers, and MC's
4 pods - Air box gutted--E3 Plugs - High Back seat - Grooved out swing arm - SS brake lines
Fork brace - 160 speedo - Auto CCT
All gold paint and chrome replaced with GOLD plate

"STUPID is Forever" Ron White.
Contact me by PM -I don't deal with stupid anymore.

Big John

Last edited by jmnjrpa; 05-07-2010 at 03:40 PM. Reason: added
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  #11  
Old 05-08-2010, 06:55 AM
Flatlander Flatlander is offline
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Quote:
Originally Posted by Winterhawk View Post
I finally adjusted my valves after 4 years and found 3 tight valves. I did a leakage test and it was good, only with some leakage around the rings. My compression was 90 on #4 before the valve adjustment and 150psi after.
I'm gonna say start with a comptession test and see if you come up with one or more cylinders low.
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