Big bore question. Please help?
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Novice
Joined: Aug 2012
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From: New Jersey
Big bore question. Please help?
Hi guys, I have just bought a 1997 Road king with a EFI 80ci evolution engine in it.
However it has considerably less power than my 02 Deuce had. I'm considering upgrading the engine so I get more power out of it.
What kind of big bore lots could I have installed into the bike to give me the power I want? Also, is there anything else I could get to increase the power either with/without a big bore kit.
Please be gentle with me here. I know very little about ports or bores, in fact I don't know a whole lot about engines in general. That's why I need the advice and then I'll have a mechanic do the work.
Thanks guys
However it has considerably less power than my 02 Deuce had. I'm considering upgrading the engine so I get more power out of it.
What kind of big bore lots could I have installed into the bike to give me the power I want? Also, is there anything else I could get to increase the power either with/without a big bore kit.
Please be gentle with me here. I know very little about ports or bores, in fact I don't know a whole lot about engines in general. That's why I need the advice and then I'll have a mechanic do the work.
Thanks guys
Seasoned HDF Member
Joined: Nov 2010
Posts: 17,547
Likes: 7,153
From: Oxford, Nc
My 98 Evo Ultra Fuelie got the boost in power, but not from a big bore kit.
My particular build featured 10:1 Weisco pistons, EV 3030 cam, flowed heads and a Power Commander with a high flow air cleaner and a free flow exhaust, ( Pro Pipe.)
Very pleased, ran well with the Twin Cams and I kept it for 65,000 miles.
My particular build featured 10:1 Weisco pistons, EV 3030 cam, flowed heads and a Power Commander with a high flow air cleaner and a free flow exhaust, ( Pro Pipe.)
Very pleased, ran well with the Twin Cams and I kept it for 65,000 miles.
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Novice
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From: New Jersey
I've already got a kuryakyn hypercharger, power commander, and true duals pipes. I assumed that getting a bigger ci in the engine size would do what I need and I read that kita can be bought. Can a configuration like that be bought as a kit of some sort?
Cruiser
Joined: Aug 2011
Posts: 115
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From: Holland, NY
I suspect you can spend your money more efficiently than increasing the bore. I would start with cams and heads--remember if you go big cam you'll want the valve springs to go with it. I have long felt that the cam defines the personality of the motor!
Because I tour a lot, I stick with harley screaming eagle stuff, but there are cheaper ways to go. Keep in mind when guys talk about race tuners and dyno runs, that extra performance comes at the price of lower gas mileage. Also, the idea of revving the motor and then slamming a brake on it does not appeal to me.
I ride a '04 Electra glide, with these parts installed when the bike was new:SE heads, SE cams (high rpm cams, I forget the number!), Increased bore (88" to 95"), high compression pistons, and the H-D flash instead of the race tuner. The bike has a lively throttle response, gets over 40 mpg, and has been reliable for 113K miles. Not cheap, though.
Because I tour a lot, I stick with harley screaming eagle stuff, but there are cheaper ways to go. Keep in mind when guys talk about race tuners and dyno runs, that extra performance comes at the price of lower gas mileage. Also, the idea of revving the motor and then slamming a brake on it does not appeal to me.
I ride a '04 Electra glide, with these parts installed when the bike was new:SE heads, SE cams (high rpm cams, I forget the number!), Increased bore (88" to 95"), high compression pistons, and the H-D flash instead of the race tuner. The bike has a lively throttle response, gets over 40 mpg, and has been reliable for 113K miles. Not cheap, though.
Seasoned HDF Member
Joined: Nov 2010
Posts: 17,547
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From: Oxford, Nc
Gentlemen please note: The OP has a 97 Evolution motor.
Most EVO upgrades involved cam, pistons and heads. Stroker kits and some big bore kits were/are available, but weren't that popular even in the Evolution days
Most EVO upgrades involved cam, pistons and heads. Stroker kits and some big bore kits were/are available, but weren't that popular even in the Evolution days
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Novice
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From: New Jersey
Stiggy, how much was your particular configuration? Also, I forgot to mention that the bike apparently has stage 2. Of course I can't be sure. I went over all the paperwork I got with the bike and he kept really good record of all the work done to the bike and the only thing I see is that when he bought it, it came with a Vance and Hines fuel pak (I assume that's still in there), cam work, and it had bub pipes that were replaced with Big Gun II Slashers pipes.
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Seasoned HDF Member
Joined: Nov 2010
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From: Oxford, Nc
Stiggy, how much was your particular configuration? Also, I forgot to mention that the bike apparently has stage 2. Of course I can't be sure. I went over all the paperwork I got with the bike and he kept really good record of all the work done to the bike and the only thing I see is that when he bought it, it came with a Vance and Hines fuel pak (I assume that's still in there), cam work, and it had bub pipes that were replaced with Big Gun II Slashers pipes.
Ported heads, pistons, cam and labor was around $1800. About 70 HP vs your stock 51.
Check out Headquarters website. They sell complete compatible kits consisting of all of the above to make things simple. They may still have a head exchange to save you a few $$$.
And a competent tech can install and tune your fuel pak accordingly.
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Thread Starter
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Novice
Joined: Aug 2012
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From: New Jersey
Stiggy, thank you for all your help with this, and to everyone else that helped. After looking at Headquarters website I'm gonna be picking you the evo 85 kit from them and having it installed by my mechanic. Now all I need is the money to buy it, lol.
Thanks guys
Thanks guys
Outstanding HDF Member
Joined: Jul 2007
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From: Daytona, Fla.
Hi guys, I have just bought a 1997 Road king with a EFI 80ci evolution engine in it.
However it has considerably less power than my 02 Deuce had. I'm considering upgrading the engine so I get more power out of it.
What kind of big bore lots could I have installed into the bike to give me the power I want? Also, is there anything else I could get to increase the power either with/without a big bore kit.
Please be gentle with me here. I know very little about ports or bores, in fact I don't know a whole lot about engines in general. That's why I need the advice and then I'll have a mechanic do the work.
Thanks guys
However it has considerably less power than my 02 Deuce had. I'm considering upgrading the engine so I get more power out of it.
What kind of big bore lots could I have installed into the bike to give me the power I want? Also, is there anything else I could get to increase the power either with/without a big bore kit.
Please be gentle with me here. I know very little about ports or bores, in fact I don't know a whole lot about engines in general. That's why I need the advice and then I'll have a mechanic do the work.
Thanks guys