To stroke, or not to stroke a 88"? - Road Glide Forums
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post #1 of 15 (permalink) Old 11-10-2014, 08:58 PM Thread Starter
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To stroke, or not to stroke a 88"?

I have a 06 RG with an 88" that I had some motor work done to about 2 years ago...added big bore kit to make it a 97", fuel management, zippers air, performance exhaust, gear drive cams (Andrews 50), dynos at 96HP and nice curve at 96TQ but most of the power comes on around 2,800rpm. Fun to ride now but thinking i want more lower end torque.

Am debating another upgrade to the motor as I prefer the styling of the older RG versus 2015's. Stopped at my motor builders to discuss port/polish heads, roller rockers, and changing to Andrews 57 cams to get some lower end torque without loosing upper end. He states that would help some but is recommending to stroke the motor to a 106" instead and stay with the 50 cams. He says HP would only raise to around 100-105 but torque would increase to 110-115 and give a lot more on the lower end for day to day riding. Thoughts?


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2006 FLTRI Yellow Pearl with 97" S&S Big Bore kit with Andrews 50G cams
S&S Power Tune Headers with Screaming Eagle mufflers and powercommander fuel management
Zippers A/C upgrqade with K&N filter, Dyno Tuned at 96 horsepower & 96 ft pds torque
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Last edited by 1drwfan; 11-10-2014 at 09:00 PM.
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post #2 of 15 (permalink) Old 11-10-2014, 11:02 PM
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There's no substitute for cubic inches.

If you decide to increase the stroke, the S&S Crank is the way to go...

"I've read dozens of books about heros and crooks, and learned much from both of their styles"

'09 SERG 117/DD7 "THE SHORT BUS"
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post #3 of 15 (permalink) Old 11-11-2014, 06:32 AM
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With an S&S 4 3/8" crank and a set of S&S 4 1/8" cylinders you could be at 117".
You probably won't want for more.
We build a lot of these.
Scott
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post #4 of 15 (permalink) Old 11-11-2014, 08:24 AM
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As mentioned there is no substitute for cubic in, but with the right cam your 97" will make riding your Harley fun again. Over caming a street driven Harley defeats the purpose of the v-twins design and is the most reoccurring complaint from owners. Big cams need big cubes and a lot more of your money.


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2005 RG 98cu in
USMC 1968-1972
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post #5 of 15 (permalink) Old 11-11-2014, 08:25 AM
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Quote:
Originally Posted by 1drwfan View Post
I have a 06 RG with an 88" that I had some motor work done to about 2 years ago...added big bore kit to make it a 97", fuel management, zippers air, performance exhaust, gear drive cams (Andrews 50), dynos at 96HP and nice curve at 96TQ but most of the power comes on around 2,800rpm. Fun to ride now but thinking i want more lower end torque.

Am debating another upgrade to the motor as I prefer the styling of the older RG versus 2015's. Stopped at my motor builders to discuss port/polish heads, roller rockers, and changing to Andrews 57 cams to get some lower end torque without loosing upper end. He states that would help some but is recommending to stroke the motor to a 106" instead and stay with the 50 cams. He says HP would only raise to around 100-105 but torque would increase to 110-115 and give a lot more on the lower end for day to day riding. Thoughts?

Being that you have liked the current build a simple 103,106, 107 style kit will build great low end power. Not be over costly to build ( 117 cylinder kit is 900 dollars approx by itself on top of the crank) A 106 with a ES 570 cam mild head work simple bolt on throttle body will make 115/115 + on pump gas at a whopping 10.2 compression. A 117 is a great build but do not forget the extras you need .. Good luck..


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2012 FLTRX 124 S&S
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post #6 of 15 (permalink) Old 11-11-2014, 08:33 AM
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You would be surprised what you could get out of your 97 by having the heads massaged by a pro, like Hillside, I have seen these builds set at 10-1 with S&S 570's go 100/110. Pipe selection is paramount.

Sure, adding more cubes will add more power, and if money isn't an issue, then by all means rock on.

Don't forget the tune.
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post #7 of 15 (permalink) Old 11-11-2014, 12:48 PM
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You've got tons of options depending on your budget. Be realistic about ALL the costs associated with tearing into your motor, and maybe a new crate motor makes more sense. And depending on your actual riding style, you might be happy with a heads/cam change.

Happiness is a warm motorcycle.
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post #8 of 15 (permalink) Old 11-12-2014, 06:45 AM
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Quote:
Originally Posted by Durwood View Post
You would be surprised what you could get out of your 97 by having the heads massaged by a pro, like Hillside, I have seen these builds set at 10-1 with S&S 570's go 100/110. Pipe selection is paramount.

Sure, adding more cubes will add more power, and if money isn't an issue, then by all means rock on.


Yep.
The very first time we ever used that .570 cam was when Jim Kennedy tuned that 98"/ 10.0 cr/our heads/Rhinehart duals, about 3 years ago. Client was from Tennesee.
107/114, std, if I remember correctly?
Just installed that cam last week in a 2009 RG CVO 110", set at 10.0 cr, with a 30T trans sprocket......snappy combo.
RG combo this week was a 2015 S/E 110" Fatcat/58mm/Stage I 110" headwork/Wood 777's at 10.5 cr...........REAL snappy.
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post #9 of 15 (permalink) Old 11-12-2014, 10:18 AM
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Check out my post and specs. on my 107 build . I couldn't be happier.
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post #10 of 15 (permalink) Old 11-12-2014, 11:15 AM
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Faced with this same decision, I opted for a 2013 Ultra with a 103 motor. World of difference. Torque out the wazoo. Able to climb trees now with no problem. (slight exaggeration for effect)
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