Help with 70 mph backfire
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Intermediate
Joined: Jan 2011
Posts: 49
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From: Queens NY
Help with 70 mph backfire
help!!!! i have a 1997 fxd that ran like a champ. i wanted to make her a lil more peppy so i went to a local shop to get an s&s carb. the guy talked me out of it by saying that if i wasnt planing on doin my heads and pistons in the future it would be a waste. he said they could re-do my carb.....something about honeing the throat and installing a yosh kit or some crap like that......and it would be just as good as a s&s. i decided to go that route......big mistake. i got the bike back and that same night it started backfiring pretty bad....i called the guy when the opened up and told him and the first words out of his mouth was that it was not the carb....it must be a new problem and to bring it in and they would look at it. the next day i went to start it and it just kept on popping while it was cranking until the battery died. next day i tried again and got it started.....rode it out there backfiring all the way. the guy calls me one week later telling me the bike is running great and there was nothing wrong with it.......BULL$#!% !!!! i go to the shop take the bike 4 exits on the parkway and between 60-70 mph she stumbles and pops....WTF this guy keeps telling me that it is not the carb but i think he is full of
sh$#. can anyone help me on this.....am i crazy? i really think they screwed up and wont admit it . he told me that the pop was more of a neusance than a problem. i think with the amount of money i paid them i could have bought an s&s like i wanted to begin with and put it on my self. it has been a couple of weeks now and i still have no bike. he is basically telling me that the backfiring is here to stay. is it the carb? thanks for you help
sh$#. can anyone help me on this.....am i crazy? i really think they screwed up and wont admit it . he told me that the pop was more of a neusance than a problem. i think with the amount of money i paid them i could have bought an s&s like i wanted to begin with and put it on my self. it has been a couple of weeks now and i still have no bike. he is basically telling me that the backfiring is here to stay. is it the carb? thanks for you help
Elite HDF Member
Joined: Apr 2010
Posts: 4,990
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From: Marina del Rey
help!!!! i have a 1997 fxd that ran like a champ. i wanted to make her a lil more peppy so i went to a local shop to get an s&s carb. the guy talked me out of it by saying that if i wasnt planing on doin my heads and pistons in the future it would be a waste. he said they could re-do my carb.....something about honeing the throat and installing a yosh kit or some crap like that......and it would be just as good as a s&s. i decided to go that route......big mistake...
Thread Starter
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Intermediate
Joined: Jan 2011
Posts: 49
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From: Queens NY
Mike, your story would be more common if others had the ***** to admit it. It would go like: "My bike ran great, until I decided to modify it." The "bargain carb-mod" that you seem a little vague on didn't work out. The "local shop" may have been an unwise choice. Why screw around? Find a pro to sort this out.
Cruiser
Joined: Aug 2008
Posts: 160
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There are all kinds of needles, passages etc. in a carb. that can get plugged up and cause the motor to run lean at certain speeds. If they plugged any of these passages during the honing process you can get the problems your relating and, unfortunately, it can be difficult to get these passages cleaned out. I had a motorcycle that had all four carbs ruined during the winter and they could not be cleaned. So much trash. Had to repace them all. Another condition that can cause backfiring at speed is a weak battery. Motorcycles generally have weak ignition systems and there might not be enough energy from the battery to get a good spark under stress.
Thread Starter
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Intermediate
Joined: Jan 2011
Posts: 49
Likes: 0
From: Queens NY
There are all kinds of needles, passages etc. in a carb. that can get plugged up and cause the motor to run lean at certain speeds. If they plugged any of these passages during the honing process you can get the problems your relating and, unfortunately, it can be difficult to get these passages cleaned out. I had a motorcycle that had all four carbs ruined during the winter and they could not be cleaned. So much trash. Had to repace them all. Another condition that can cause backfiring at speed is a weak battery. Motorcycles generally have weak ignition systems and there might not be enough energy from the battery to get a good spark under stress.
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