Heling a buddy need some carb advice
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Road Captain
Joined: Aug 2005
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Heling a buddy need some carb advice
My buddy has a 1997 Dyna with 12,000 miles. We had the carb tanked and gone through because it was running horrible. Now the bike runs great but it's a major chore to start it cold. It has always been hard to start for that matter.
Basically what it's doing is choke or no choke tries to fire and dies instantly. Then puffs some smoke out the carb.
Not sure what is causing this and how to correct it?
Once you get it running it goes great and starts fine.
Thanks Brett
Basically what it's doing is choke or no choke tries to fire and dies instantly. Then puffs some smoke out the carb.
Not sure what is causing this and how to correct it?
Once you get it running it goes great and starts fine.
Thanks Brett
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Road Captain
Joined: Aug 2005
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No clue but the bike has never been touched as far as I know. SE slip ons and K&N Breather.
The guy that redid the carb gave me a spec sheet on the mods he made, I should have posted that earlier but I didn't think anything he did had anything to do with cold starting. No jets were changes just adjustment with stock parts.
Is there and adjustment I can make to the choke needle if that is correct terminology?
The guy that redid the carb gave me a spec sheet on the mods he made, I should have posted that earlier but I didn't think anything he did had anything to do with cold starting. No jets were changes just adjustment with stock parts.
Is there and adjustment I can make to the choke needle if that is correct terminology?
Grand HDF Member
Joined: May 2008
Posts: 4,325
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From: Picayune, Ms.
First there isn't a "choke" on the CV carb, it is called an "enriching" valve and adds fuel to act like a choke. You can't adjust it. You can make sure it is properly installed, but since the bike runs fine once warmed-up I suspect this isn't the problem.(Would run rich if not)
Just for grins and since it isn't difficult or expensive, clean the K&N filter.
Make sure the Push/Pull cables are properly adjusted. An easy task.
Replace the spark plugs and make sure they are gaped properly; HD says the plugs should be replaced every 5,000 miles. (Not cleaned, REPLACED) they are cheap enough.
Make sure the carb is perpendicular to the Earth.
Check the acceleration jet/pump is pointed directly at the center of the intake and is functioning.
Back spitting through the carb is normal, you can even feel/see it when the engine is running, just when the engine is running it all gets sucked back into the engine. This is due to the overlap of the valves. (exhaust and intake are open at the same time) Remember both pistons go up and down at the same time.
Try shutting the fuel valve off a few seconds before stopping the engine, then start the engine before opening the fuel valve, that way you will determine if the float is set correctly. (probably is) since you just had the carb overhauled. But a change in Temp or Barometric pressure can force fuel into the intake system. (rare but possible)
And last but not least, may just be the nature of the beast. After all it does start and run. You could spend hours, days, weeks, months even years and spend money trying to fix something that isn't broken.
Just for grins and since it isn't difficult or expensive, clean the K&N filter.
Make sure the Push/Pull cables are properly adjusted. An easy task.
Replace the spark plugs and make sure they are gaped properly; HD says the plugs should be replaced every 5,000 miles. (Not cleaned, REPLACED) they are cheap enough.
Make sure the carb is perpendicular to the Earth.
Check the acceleration jet/pump is pointed directly at the center of the intake and is functioning.
Back spitting through the carb is normal, you can even feel/see it when the engine is running, just when the engine is running it all gets sucked back into the engine. This is due to the overlap of the valves. (exhaust and intake are open at the same time) Remember both pistons go up and down at the same time.
Try shutting the fuel valve off a few seconds before stopping the engine, then start the engine before opening the fuel valve, that way you will determine if the float is set correctly. (probably is) since you just had the carb overhauled. But a change in Temp or Barometric pressure can force fuel into the intake system. (rare but possible)
And last but not least, may just be the nature of the beast. After all it does start and run. You could spend hours, days, weeks, months even years and spend money trying to fix something that isn't broken.
Seasoned HDF Member
Joined: Dec 2010
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From: Coromandel Peninsula New Zealand
Usually you need a #45 or #48 idle jet if cold starts are an issue, enrichener or choke, it does the same job but as stock these bikes tend to be set up super-lean and if you have a #42 idle jet you should change it as a matter of course.
Outstanding HDF Member
Joined: Nov 2013
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When I bought mine I didn't do this and it was a real bear to start. When cold I give mine two twists of the throttle then pull out the enricher all the way before hitting the starter it will then fire almost instantly, once it fires I'll use the throttle to keep it going for about 5 seconds then close the enricher and hold the rpms at 1000-1500 with the throttle lock or hand for a minute then slowly get moving down the road. It's very rare it will ever idle on it's own when cold with the enricher out. It does occasionally but I've found this to be easier and quicker and it works every time. If I just pull the enricher and don't give it a twist or two it never wants to fire.
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Road Captain
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Elite HDF Member
Joined: Oct 2005
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From: Canton, Michigan
Between the SE slip-ons and the K&N air cleaner, the bike is running even leaner than stock. Assuming the stock jet is still in there.
First thing I did on my 93 when new, was to remove the aluminum plug and adjust the idle mixture screw....
First thing I did on my 93 when new, was to remove the aluminum plug and adjust the idle mixture screw....
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Road Captain
Joined: Aug 2005
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I may have found the problem or part of it. I got it started today and shot carb cleaner at the intake manifold ports. Both side are leaking. Going to fix that with new plugs and see what happens.
Thanks again
Thanks again
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