Jet size?
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Road Captain
Joined: Jun 2008
Posts: 640
Likes: 13
From: Hickory, NC area
Jet size?
I have new pipes and an air cleaner that should be home when I get back this weekend. I'd like to pick up some jets at the stealer (in the state I am currently) so I don't have to go out and get them when I do the swap. Anyone know what main jet is likely to be in my 90 FLHTCU with a stock CVC carb? Also, am I likely to need any jets other than the main? And do you have any recommendations for a good starting point?
I live in NC and ride towards the "mountains" (I used to live in Colorado so these are just bumps really) and get up a couple thousand feet above sea level at the most - usually only like 500-700 feet above.
Thanks for any advice.
I live in NC and ride towards the "mountains" (I used to live in Colorado so these are just bumps really) and get up a couple thousand feet above sea level at the most - usually only like 500-700 feet above.
Thanks for any advice.
HDF Community Team
Joined: Dec 2005
Posts: 5,374
Likes: 2,570
From: NC USA
I switched to a CV on my 87 FLT. When I got it (used) it was jetted 45/165. My pipes were pretty much open but not totally gutted. Ran a little lean at mid-range and high speed, great fuel mileage (54mpg). I changed to a 175 and it was still a little "hot" at low speed, so went on up to a 48 low jet, which everyone tells me is too big. I've added just a tick of backpressure to the pipes, runs great, and I get 48 - 51 mpg if under 70 mph, and worst I get is 42 - 44 mpg, riding high speed and gunning it a lot. Plugs read perfect at all ranges. I live in the Tarheel also, near the mountains.
I don't remember EXACTLY when they changed, but the first CV carbs ('90) DID NOT have an accelerator pump, so I don't know what this may do for, or do to you. According to my book, the none California models in '90 were jetted 45/185. And make sure the idle mixture screw plug is removed and adjust that before changing any jets.
Hope this helps and here is a link to a plug reading tutorial that will do you more good than anyone's opinion as far as what works for your bike's setup.
http://www.cyclespot.com/Jetting.html
I don't remember EXACTLY when they changed, but the first CV carbs ('90) DID NOT have an accelerator pump, so I don't know what this may do for, or do to you. According to my book, the none California models in '90 were jetted 45/185. And make sure the idle mixture screw plug is removed and adjust that before changing any jets.
Hope this helps and here is a link to a plug reading tutorial that will do you more good than anyone's opinion as far as what works for your bike's setup.
http://www.cyclespot.com/Jetting.html
Last edited by t150vej; Aug 7, 2008 at 07:23 PM. Reason: additional info
Thread Starter
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Road Captain
Joined: Jun 2008
Posts: 640
Likes: 13
From: Hickory, NC area
Thanks for the reply - the vocab is killin' me. You refer to a "low jet" which I think is the Main Jet in my mind. The 175/185/165 in my mind represent the air jet if I am thinking about this right. IDK.
I know I really need to open it up - this is like giving a haircut over the phone, but I thought the main fuel jet would be fairly easy to tag so I could go pick up a couple to try our once I have the pipes and AC on. Not that easy.
I know I really need to open it up - this is like giving a haircut over the phone, but I thought the main fuel jet would be fairly easy to tag so I could go pick up a couple to try our once I have the pipes and AC on. Not that easy.
HDF Community Team
Joined: Dec 2005
Posts: 5,374
Likes: 2,570
From: NC USA
Main jet is the physically big one (as well as the larger number)
Low, is low-speed jet (smaller size/number)
People will give you MUCH advise on what and how to hop-up your carb, but my best advice is to do only one modification at a time and check your results. And, it depends on what you hope to get out of the engine. With a dresser (bagger or whatever people want to call them these days) there are a lot of modifications that truly will not gain you anything because weight of the bike.
Here are 2 more links that will help:
http://www.harley-performance.com/ha...arburetor.html
http://www.harley-performance.com/ha...r-jetting.html
Low, is low-speed jet (smaller size/number)
People will give you MUCH advise on what and how to hop-up your carb, but my best advice is to do only one modification at a time and check your results. And, it depends on what you hope to get out of the engine. With a dresser (bagger or whatever people want to call them these days) there are a lot of modifications that truly will not gain you anything because weight of the bike.
Here are 2 more links that will help:
http://www.harley-performance.com/ha...arburetor.html
http://www.harley-performance.com/ha...r-jetting.html
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