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[3mcam]

My 110" CVO has finally gotten to the point where I feel I must make a decision. My troubles are excessive valve train noise/piston slap and unacceptable oil consumption. On my recent trip to Sturgis my 2010 SESG used 3.5 quarts of oil in a 4200 mile round trip and only obtained 30-32 mpg's.

I am considering several options. Rebuild the 110 with better parts. Upgrade to a 117 with top quality parts or to help with the MPG's  and valve train/ piston slap noise replace the motor with a 96 or 103.

I am requesting input or suggestions from those with more knowledge than myself. I have gotten over the need to have the BIG motor with tons of HP & Torque. Looking for reliability with MPG's.

My 06 Heritage with a 88" motor got 50-52 mpg's which I loved but was what I considered underpowered at least in my mind and my dreams of a BIG motor. Can an 88" be put in place of a 110" without major modification? 

[JKM]

a 117" kit would definitely cure your issues.  Other option to consider is working with your current 110" and I would suggest the following

- Have the heads done.  This will allow you to replace the guides and springs that are of poor quality, while at the same time making the heads flow better.  For a good touring application, consider setting the compression at 10:1.  Won't be a hot rod, but a good reliable set -up.  Cam should be changed (discussed below)
- with the heads off, replace the pistong rings.  Likely your issue on oil consumption.  If you encounter issues with the cylinders, then consider boring out your current cylinders or moving up to a 117" kit.  If cylinders are good then a new set of rings will do the trick
- If you have not changed out the cam, then would highly suggest doing this with say a S&S 570 which works well with 10:1 compression as mentioned above.  Make sure you change the inner cam bearing with a quality unit.  S&S sells an install kit with bearing and gaskets.
- Definately change out your lifters.  A lot of failures noted on here.  S&S lifters are highly recommended, among others.  stay away from the HD lifters.
- While everything is open check your crank run-out.  Any more than 0.005" you should consider have your crank done
- Depending on mileage, consider pre-emptively changing out your compensator.  Not sure what version the 2010 CVOs used, but if it's the old non-screamin eagle version then i would definately change it out.

[3mcam]

All of that has already been completed. I did use different cams.

[DCC]

I'm curious...how many miles?

[3mcam]

A little under 15,000.

[HD Street Performance]

Bore to a 113" and fix the 110 head maladies plus a decent cam and lifters. Been using a Mahle flat top piston that fits tight and these builds last a long time.

[3mcam]

Would the case need to be bored also.

[HD Street Performance]

No we use your original cylinders bored .060 OS

[3mcam]

That is a very intriguing option.

[grc]

How about a S&S 124 crate motor?  I keep seeing good reports from people who have gone that way versus throwing a pile of money into the 110's.  Just a thought.

Jerry

[HD Street Performance]

Certainly a good option if including the needed upgrades the budget is there.

[3mcam]

I would like to keep the original integrity of the ride intact. Plus the 117,120R or a 124 would certainly increase performance but would significantly decrease MPG's. The 113 upgrade has peaked my interest. Which piston's and rings would be the best choice for the 113 upgrade?

[HILLSIDECYCLE.COM]

That is a very intriguing option.

Bored 2 sets to 113" 2 weeks ago here.

[Lever]

Bored 2 sets to 113" 2 weeks ago here.

 

[Para Bellum]

All of that has already been completed. I did use different cams.

I don't understand.  What "all" has been completed?  JKM suggested a number of fixes, so it's hard to tell what you had done.