Acceleration problems on a 1990 ultra classic
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1st Gear
Joined: Mar 2018
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From: Indianapolis
Acceleration problems on a 1990 ultra classic
i just bought a 1990 ultra classic with the 80in evo the guy I bought it from told me that it was running fine then out of nowhere it would Accelerate to a certain rpm and could go over 30mph it idles fine but when you crack the throttle it spits and backfires out the carb where do I need to start to fix this
Dirt don't hurt
Joined: Jan 2011
Posts: 21,066
Likes: 4,568
From: Haslet Texas
i just bought a 1990 ultra classic with the 80in evo the guy I bought it from told me that it was running fine then out of nowhere it would Accelerate to a certain rpm and could go over 30mph it idles fine but when you crack the throttle it spits and backfires out the carb where do I need to start to fix this
I believe THC said clean the carb. It's not a big deal and cheap, so if it doesn't work not a big loss. Throw some new plugs and wires on it while you're at it. Was it rebuilt correctly?? Correct jets or TOO BIG?
I prefer to change to a S&S carb, simple adjustment and done.
Welcome to the Forum. You'll find all kind of people here. When you are asking questions, especially to the EVO, Shovel, or Panhead people, most know a little (a lot) about them or they wouldn't still be riding. People here can walk you through just about anything if you give them enough information and the do what they suggest. Yes I have an 89 FLHTCU.
I prefer to change to a S&S carb, simple adjustment and done.
Welcome to the Forum. You'll find all kind of people here. When you are asking questions, especially to the EVO, Shovel, or Panhead people, most know a little (a lot) about them or they wouldn't still be riding. People here can walk you through just about anything if you give them enough information and the do what they suggest. Yes I have an 89 FLHTCU.
Last edited by TSheff; Mar 7, 2018 at 10:38 PM.
Thread Starter
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1st Gear
Joined: Mar 2018
Posts: 5
Likes: 0
From: Indianapolis
I believe THC said clean the carb. It's not a big deal and cheap, so if it doesn't work not a big loss. Throw some new plugs and wires on it while you're at it. Was it rebuilt correctly?? Correct jets or TOO BIG?
I prefer to change to a S&S carb, simple adjustment and done.
Welcome to the Forum. You'll find all kind of people here. When you are asking questions, especially to the EVO, Shovel, or Panhead people, most know a little (a lot) about them or they wouldn't still be riding. People here can walk you through just about anything if you give them enough information and the do what they suggest. Yes I have an 89 FLHTCU.
I prefer to change to a S&S carb, simple adjustment and done.
Welcome to the Forum. You'll find all kind of people here. When you are asking questions, especially to the EVO, Shovel, or Panhead people, most know a little (a lot) about them or they wouldn't still be riding. People here can walk you through just about anything if you give them enough information and the do what they suggest. Yes I have an 89 FLHTCU.
Dirt don't hurt
Joined: Jan 2011
Posts: 21,066
Likes: 4,568
From: Haslet Texas
Unless the previous owner is a friend don't trust anything they tell you.
thanks and i havent picked the bike up yet wont be till Sunday befor I pick it up Im just trying to figure out where to start when it here and I had some one tell me to put the s&s super e on it but I dont wanna do that cause I plan on rebuilding it next winter just wanna get the carb thats on it right if I can for this summer this is my first Harley and need to learn about it like what to expect and all and idk if that guy rebuilt the carb right or not I know its hard to start but once its start it idles fine but crack the throttle and I spits sputters and backfires through the carb
That last part tells me there is a lean condition happening.
1: Make sure the float level is correct
2: Check the rubber connector that the carb goes into to make sure it doesn't have any cracks
3: Check your intake gaskets
Let us know what you find.
Personally I much prefer the E to the stock carb because of how it mounts to the intake (well that's one of many reasons)
thanks and i havent picked the bike up yet wont be till Sunday befor I pick it up Im just trying to figure out where to start when it here and I had some one tell me to put the s&s super e on it but I dont wanna do that cause I plan on rebuilding it next winter just wanna get the carb thats on it right if I can for this summer this is my first Harley and need to learn about it like what to expect and all and idk if that guy rebuilt the carb right or not I know its hard to start but once its start it idles fine but crack the throttle and I spits sputters and backfires through the carb
1: Make sure the float level is correct
2: Check the rubber connector that the carb goes into to make sure it doesn't have any cracks
3: Check your intake gaskets
Let us know what you find.
Personally I much prefer the E to the stock carb because of how it mounts to the intake (well that's one of many reasons)
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Joined: Nov 2009
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From: Farmington ,MS
The number of people who think they can rebuild a carb...and the number of people who can actually do it... is vastly different.
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Not sure I get what's going on here.
OP, have you actually ridden this bike yet? Sounds like you are saying all of this is based on what the seller told you about how the bike is misbehaving. If so, I wouldn't plan on anything until you have the bike in hand and can see for yourself what's going on.
The S&S is nice, but there's no reason the factory Keihin CV carb won't run just fine.
OP, have you actually ridden this bike yet? Sounds like you are saying all of this is based on what the seller told you about how the bike is misbehaving. If so, I wouldn't plan on anything until you have the bike in hand and can see for yourself what's going on.
The S&S is nice, but there's no reason the factory Keihin CV carb won't run just fine.
