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/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> Carb again /cgi-bin/YaBB.pl?num=1301169686 Message started by KNOCKDOLIAN on 03/26/11 at 13:01:26 |
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Title: Carb again Post by KNOCKDOLIAN on 03/26/11 at 13:01:26 Hi all, back to carbs again. I've had to take my straight through muffler off as it is just too loud. I went through all the jet info and got it running sweeet. I have now fitted a HD muffler and it just wont run right. on hard acceleration it will miss and pop and wont accelerate past 3/4 unless I twist throttle slow. Now correct me if im wrong but top end is controlled by the main jet. I have tried all my main jets from 140 to 155 and gone from 3/4 spacer to none. Still no top end. Could it be a too restrictive exhaust. I will upset the neighbours by running with no muffler tomorrow just to see. Any ideas would be gratefully received :'( |
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Title: Re: Carb again Post by verslagen1 on 03/26/11 at 13:05:22 7667736A6C260 wrote:
Put the full white spacer back in and try a 150 or 152, anyway good place to start. |
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Title: Re: Carb again Post by Boofer on 03/26/11 at 13:16:54 A shot in the dark, but could the replacement muffler be collapsed inside? Catalytic converters were know for causing similar symptoms when they first came out. Especially if used with leaded gas and got plugged up. I like to look at the easy things first, but I do defer to Verslagen's superior knowledge. Just for kicks, tap on the bottom of the muffler with a rubber mallet and listen. Then crank it and see if anything blows out. |
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Title: Re: Carb again Post by KNOCKDOLIAN on 03/26/11 at 13:18:40 Thanks, tried that, full spacer in and up to the 155 still the same?? |
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Title: Re: Carb again Post by verslagen1 on 03/26/11 at 13:32:22 Is there a washer under the main jet? |
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Title: Re: Carb again Post by KNOCKDOLIAN on 03/26/11 at 13:36:56 Yes there is a washer under the main jet. Ill have another look tomorrow its 2100 Hrs here in the uk and Ive been playing with this all day |
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Title: Re: Carb again Post by MotoBuddha on 03/26/11 at 13:54:38 If going richer isn't working, then maybe it's time to go leaner. |
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Title: Re: Carb again Post by Routy on 03/27/11 at 07:41:09 6273677E78320 wrote:
If it runs "sweeet" w/ the strate pipe, and that terrible w/ the muffler, then the muffler is at fault. There is no muffler that is going to cause that much of a problem unless it is seriously (defectively) restricted ! A muffler will cause it to run a little richer, but not to the point which you describe. |
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Title: Re: Carb again Post by KNOCKDOLIAN on 03/27/11 at 11:35:10 212E342F333526242C2235470 wrote:
If it runs "sweeet" w/ the strate pipe, and that terrible w/ the muffler, then the muffler is at fault. There is no muffler that is going to cause that much of a problem unless it is seriously (defectively) restricted ! A muffler will cause it to run a little richer, but not to the point which you describe. That makes sence, Didnt get around to it today. Had a marathon to run. Ill play againe when I can feel my legs :) [/quote] |
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Title: Re: Carb again Post by KNOCKDOLIAN on 03/29/11 at 12:08:21 Routy was bang on. I put an old sporty muffler on and all seems well again. Thanks all |
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Title: Re: Carb again Post by justin_o_guy2 on 03/29/11 at 20:08:37 Waaaay to Goooooo Routy! |
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Title: Re: Carb again Post by KNOCKDOLIAN on 03/30/11 at 12:05:39 Woops, nearly done but not quite. When riding hard and quick shut off, if you use the engine to brake not a problem but if you shut off and pull the clutch to coast to a stand still the engine will die. Im 3.5 turns out and a 50 idle jet. If screwing out richens do I need a bigger idle jet and screw in a bit. We in the UK need to tune for economy more than praformance as fuel is due to hit £1.50 a Lt I think that works out at about $10 a gallon. What fun :'( |
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Title: Re: Carb again Post by EJID on 03/30/11 at 12:08:09 Just double checking one of the basics here, but you have adjusted the idle screw to run about 1000-1200 rpm at idle, correct? |
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Title: Re: Carb again Post by KNOCKDOLIAN on 03/30/11 at 12:42:37 Yep, no rev counter but running high if anything. As I said if you engine brake no problem but its my wifes bike and she will coast which will cause the engine to stall |
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