Ultima 131
Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,897
From: Bedford UK
John of Miacycles is a long standing Ultima fan and expert who can offer suggestions on improving them, by replacing selected parts to improve reliability. I believe he has even built a 140, or there-abouts, that will fit a stock frame! Hopefully he'll call by soon.
Seasoned HDF Member
Joined: Aug 2008
Posts: 5,070
Likes: 2,115
From: Ohio
John Sachs known as Sachs Race Engines in Florida is a Ultima specialist, puts out some crazy numbers with them by cleaning up the heads and knows that engines weakness on the parts side. On one of the other forums John cleaned up a Ultima 113" that dyno'd 139 in the real world and was in a light FXR. He also uses a reworked S&S with a Thunderjet and airbleeds.
<dynalee@bellsouth.net>
<dynalee@bellsouth.net>
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Cruiser
Joined: Nov 2009
Posts: 112
Likes: 0
From: Southern California
Thanks i'll be in contact with those mentioned I appreciate all the suggestions, by the way those are some heck of numbers from a 113 where do you all think this 131 will land with headwork and the change of a few parts?
Seasoned HDF Member
Joined: Aug 2008
Posts: 5,070
Likes: 2,115
From: Ohio
That 131 uses a 4 5/8th flywheel which creates torque over the standard 4 1/2 that is common with big cubes, you shouldn't have any problems with your eyes watering under acceleration, should touch low to mid 150 torque and hp on a dyno with some cleanup, exhaust and fuel system to feed it.
Road Warrior
Joined: Aug 2007
Posts: 1,557
Likes: 66
From: Oakdale Ca.
The only prob i had was a week battery grinding teeth off my flywheel. Now with the new battery no issues, John Sachs recommended the 656 redshift to me he said he made 130 ft tq with a 113, Just think what a 127 or 131 will do.....
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Cruiser
Joined: Nov 2009
Posts: 112
Likes: 0
From: Southern California
Now that's some POWER I appreciate the input gentlemen I've contacted all three shops mentioned and I'm just waiting for there responses I'll definitely keep everyone in the loop of how this project unfolds, and by the way anymore suggestions are all welcome Thanks
Road Warrior
Joined: Aug 2007
Posts: 1,557
Likes: 66
From: Oakdale Ca.
If you end up going to a super d for max power or super G with a thunderjet I will buy that mikuni from you. I have another project that doesnt have a carb yet.
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