Jet Recommendation
Thread Starter
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Tourer
Joined: Apr 2010
Posts: 465
Likes: 5
From: Cleveland, Ohio
Jet Recommendation
So the bike is a 92 FLSTC with a Andrews EV27 cam, a hyper charger, 2 1/4 inch pipes with V-Twin 31-1406 10 inch baffles, stock engine size, stock keihin carb.
The bike currently has a 185 main jet and a 45 slow jet.
The bike seems to be running pretty rich.
I was wondering if anyone had a recommendation on where to start with the jet sizes.
Thanks.
The bike currently has a 185 main jet and a 45 slow jet.
The bike seems to be running pretty rich.
I was wondering if anyone had a recommendation on where to start with the jet sizes.
Thanks.
Extreme HDF Member
Joined: Sep 2010
Posts: 14,744
Likes: 402
From: Phoenix '53, '88, '09 Big Twins
there are good carb modding and tuning tips in the bike tech section of nightrider.com
the hype charger flows about 150 CFM- compare to the 135~140 on the stock air cleaner. The screaming eagle or ness with oiled washable cloth filter media flow 260 CFM
so what you have is not a large increase in flow- it may also introduce a vacuum leak with it's door system.
I have tuned a few evos including some with that cam, but not with those pipes.
My carbs will have drilled and chamfered slides and the N65 needle.
I often use a 42 slow jet and the high speed jet can be a 175, 180, 185 depending.
The tips at nightrider will help you figure out how to judge what needs doing
mike
the hype charger flows about 150 CFM- compare to the 135~140 on the stock air cleaner. The screaming eagle or ness with oiled washable cloth filter media flow 260 CFM
so what you have is not a large increase in flow- it may also introduce a vacuum leak with it's door system.
I have tuned a few evos including some with that cam, but not with those pipes.
My carbs will have drilled and chamfered slides and the N65 needle.
I often use a 42 slow jet and the high speed jet can be a 175, 180, 185 depending.
The tips at nightrider will help you figure out how to judge what needs doing
mike
Road Master
Joined: Nov 2013
Posts: 1,216
Likes: 286
From: Buford, GA
I was running a 46/185 with a stock motor, Ness Big Sucker & Rush Racing 6020ST exhaust. After the rebuild with EV27, KB 9.5:1 pistons and head work I'm running 46/195.
Have you adjusted the idle mixture screw? EZ adjust screw and adjusting info is available at https://cv-performance.com/carburetor-parts
Have you adjusted the idle mixture screw? EZ adjust screw and adjusting info is available at https://cv-performance.com/carburetor-parts
Last edited by Tony_N; Mar 2, 2017 at 06:26 PM.
Thread Starter
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Tourer
Joined: Apr 2010
Posts: 465
Likes: 5
From: Cleveland, Ohio
I just checked the mixture screw. It was backed out 3 turns from seated. I turned it back in one full turn. Haven't had a chance to check things out since then.
I also just replaced the plugs with some new ones. The old plugs looked like they came straight out of a coal mine.
I got the bike last weekend and the weather has been crap so far. I have just had the bike idling in my garage to check things out. I would throttle her up and she would bog down for a moment and then snap back into place. The more I read about the evo bike, it looks like the jetting might be pretty close to whats in there. It is suppose to be 50 or so on Sunday and I am hoping to get her out and put her through the paces.
I also just replaced the plugs with some new ones. The old plugs looked like they came straight out of a coal mine.
I got the bike last weekend and the weather has been crap so far. I have just had the bike idling in my garage to check things out. I would throttle her up and she would bog down for a moment and then snap back into place. The more I read about the evo bike, it looks like the jetting might be pretty close to whats in there. It is suppose to be 50 or so on Sunday and I am hoping to get her out and put her through the paces.
Grand HDF Member
Joined: Apr 2007
Posts: 3,725
Likes: 3,070
From: Brighton, MI
That nightrider site is good, but don't drill the slide like it recommends.. Leave the air bleed hole alone. I'm a stock 1340 stage 1, and running 45/175. The numbers being posted are good suggestions for your set up. However, reading your plugs and testing performance is about the best way to get it dialed in. YD
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Thread Starter
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Tourer
Joined: Apr 2010
Posts: 465
Likes: 5
From: Cleveland, Ohio
So the previous owner of the bike did something to the top end to make it a top breather. He had some home made breather bolts and put a threaded insert in the head to make the the hole a 5/16-18.
Over the weekend I fab'd up some longer breather bolts and was able to install a Screamin Eagle air cleaner kit from an '08 and up Softail kit.
Took the bike out today for about 30 minutes and she ran great. The only thing I did besides the breather kit was turn in the idle mixture screw one full turn from where it was and put in new plugs.
I pulled the plugs when I got home and they looked perfect. A nice light/dusty tan.
But after the pulling the front plug, it looks like I am burning some oil
The base of plug by threads on the plug had evidence of burnt oil. I started the bike up and sure enough, the front cylinder was blowing smoke out of the pipe on deceleration.
There is a no name thermometer dip stick on the bike. I checked the oil level and it was way above the mark on the dipstick. Now being some no name brand dip stick I am not sure how accurate the mark on the stick is. So now I am the hunt for a stock dip stick to see if it is just way over filled causing the oil issue.
Over the weekend I fab'd up some longer breather bolts and was able to install a Screamin Eagle air cleaner kit from an '08 and up Softail kit.
Took the bike out today for about 30 minutes and she ran great. The only thing I did besides the breather kit was turn in the idle mixture screw one full turn from where it was and put in new plugs.
I pulled the plugs when I got home and they looked perfect. A nice light/dusty tan.
But after the pulling the front plug, it looks like I am burning some oil
The base of plug by threads on the plug had evidence of burnt oil. I started the bike up and sure enough, the front cylinder was blowing smoke out of the pipe on deceleration.
There is a no name thermometer dip stick on the bike. I checked the oil level and it was way above the mark on the dipstick. Now being some no name brand dip stick I am not sure how accurate the mark on the stick is. So now I am the hunt for a stock dip stick to see if it is just way over filled causing the oil issue.
Last edited by dibe; Mar 5, 2017 at 07:27 PM.
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Cruiser
Joined: May 2020
Posts: 144
Likes: 33
From: Carlisle, Pa
Hello fellow forum folks..
I'm currently running a 4 5/8" stroker, CV40 with a homemade made incognito Stage 1 aibox with a velocity stack and Screamin' Eagle slip ons.
My jetting is a whopping 50 pilot and 195 Main. After my engine is broken in im likely to to go north of a 200 Main. Time will tell....
I'm currently running a 4 5/8" stroker, CV40 with a homemade made incognito Stage 1 aibox with a velocity stack and Screamin' Eagle slip ons.
My jetting is a whopping 50 pilot and 195 Main. After my engine is broken in im likely to to go north of a 200 Main. Time will tell....
