Getting more power out of an Evo
Road Warrior
Joined: May 2008
Posts: 1,372
Likes: 2
From: Central Coast of Cali
John at scooters is a good guy and knows his stuff
http://www.scootersperformance.com/
Ron Simms Thug motor is one of the very best motors ever made www.ronsimms.com
Arlen Ness (ask for Shane) has good deals on Motors from time to time. arlenness.com
http://www.scootersperformance.com/
Ron Simms Thug motor is one of the very best motors ever made www.ronsimms.com
Arlen Ness (ask for Shane) has good deals on Motors from time to time. arlenness.com
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Banned
Joined: Sep 2008
Posts: 69
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From: In a house
Actually, if you read the few magazines that actually test for performance, the Evo was just as fast as the current TC96. But we all need more power than stock, and you're on the right track for a noticeable bump in power by changing the cam, exhaust, and air cleaner. If you can still get a Screamin' Eagle air cleaner for an Evo (with a K&N filter), they're as good and as cheap as any if you order from one of the 20% discount dealers. Otherwise, I'd go with the complete air cleaner and filter from K&N. Good slip-on mufflers like Cycle Shack or Kerker or D&D on the stock headers will make nearly as much power with these mods as anything else, and for a better price.
An Andrews EV13 for more low end, or an EV27 for more power above 3000 rpm would be good reliable choices that won't hurt your fuel mileage much, if any. Be sure to toss the OEM inner cam bearing and use a Torrington B-138 instead. New lifters are a must; the OEM in '94 were weak. Some say the newer style Evo lifters from Harley are OK, and less expensive. I used Crane.
Evo heads flow quite well for OEM, so it's not a necessity to do anything to the heads.
If you don't want to spend money on a Mikuni carb, the CV does very well with some modifications. The http://www.nightrider.com/biketech/hd_cv_mods.htm site covers these very well. In any case, do not use the kits like the Thunder Slide or Dyno- whatever. These make the carb way too rich.
Even with the stock cam, the exhaust, carb and air cleaner improvements will wake up your Evo noticeably; with the cam you'll be smiling enough to have a problem with bugs on your teeth.
One other improvement you might consider for the future; New Progressive fork springs and shocks. Big difference in handling and overall road feel.
An Andrews EV13 for more low end, or an EV27 for more power above 3000 rpm would be good reliable choices that won't hurt your fuel mileage much, if any. Be sure to toss the OEM inner cam bearing and use a Torrington B-138 instead. New lifters are a must; the OEM in '94 were weak. Some say the newer style Evo lifters from Harley are OK, and less expensive. I used Crane.
Evo heads flow quite well for OEM, so it's not a necessity to do anything to the heads.
If you don't want to spend money on a Mikuni carb, the CV does very well with some modifications. The http://www.nightrider.com/biketech/hd_cv_mods.htm site covers these very well. In any case, do not use the kits like the Thunder Slide or Dyno- whatever. These make the carb way too rich.
Even with the stock cam, the exhaust, carb and air cleaner improvements will wake up your Evo noticeably; with the cam you'll be smiling enough to have a problem with bugs on your teeth.
One other improvement you might consider for the future; New Progressive fork springs and shocks. Big difference in handling and overall road feel.
Thanks for the replys.
Ultimate HDF Member
Joined: Jul 2007
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Ultimate HDF Member
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I felt (seat of the pants) a world of difference on my evo just by changing the exhaust ( first with Cycle Shack slipons, then Hooker 2-1 tuned flow) and an S&S Super E carb. The CV carb is a good one when modified. The post by mp is right on if you want more without going broke.
Road Warrior
Joined: May 2008
Posts: 1,372
Likes: 2
From: Central Coast of Cali
If you want decent power, rebuild it or get a new motor. Slip ons, air cleaner and a carb rebuild isn't gonna do much. Even a mikuni on that motor isn't gonne do much as the motor is what it is...have you thought about at least stroking the motor, hi compression pistons and a cam? If you do that with a mikuni, then you will be in decent shape...
Road Warrior
Joined: May 2008
Posts: 1,372
Likes: 2
From: Central Coast of Cali
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Joined: Sep 2008
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From: In a house
[QUOTE=oldairboater;4642335]You should post how much you can spend and if you are going to do the work yourself. Without enough information you get answers from on extreme to the other.[/QUOTE
Yes, I plan on doing the work myself. As far as a budget goes, I would spend a couple grand if thats what it takes but on the other have if I can cut that cost in half and still get the extra Torque /Performance that I'm look for then it's a no brainer.
Don't need 120hp but on the other hand when doing 65mph and hit the throttle, I want power NOW!
And anyone reading this that decides to swap out an EVO for a Korean engine, let me know as I will be more then happy to give you a fair price for it.
Thanks for the replys.
Yes, I plan on doing the work myself. As far as a budget goes, I would spend a couple grand if thats what it takes but on the other have if I can cut that cost in half and still get the extra Torque /Performance that I'm look for then it's a no brainer.
Don't need 120hp but on the other hand when doing 65mph and hit the throttle, I want power NOW!
And anyone reading this that decides to swap out an EVO for a Korean engine, let me know as I will be more then happy to give you a fair price for it.
Thanks for the replys.
Road Warrior
Joined: May 2008
Posts: 1,372
Likes: 2
From: Central Coast of Cali
[QUOTE=Ridetard;4642408]
If you are gonna do the work yourself, you need to check out patricks Racing as they have performance kits for most motors and you can get 100+hp for a couple grand easily...
You should post how much you can spend and if you are going to do the work yourself. Without enough information you get answers from on extreme to the other.[/QUOTE
Yes, I plan on doing the work myself. As far as a budget goes, I would spend a couple grand if thats what it takes but on the other have if I can cut that cost in half and still get the extra Torque /Performance that I'm look for then it's a no brainer.
Don't need 120hp but on the other hand when doing 65mph and hit the throttle, I want power NOW!
And anyone reading this that decides to swap out an EVO for a Korean engine, let me know as I will be more then happy to give you a fair price for it.
Thanks for the replys.
Yes, I plan on doing the work myself. As far as a budget goes, I would spend a couple grand if thats what it takes but on the other have if I can cut that cost in half and still get the extra Torque /Performance that I'm look for then it's a no brainer.
Don't need 120hp but on the other hand when doing 65mph and hit the throttle, I want power NOW!
And anyone reading this that decides to swap out an EVO for a Korean engine, let me know as I will be more then happy to give you a fair price for it.
Thanks for the replys.