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Thread: US90 torque improvement

  1. #1
    Join Date
    Mar 2016
    Location
    Oklahoma city
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    26

    US90 torque improvement

    Apart from a sprocket change is their anything available engine wise (cam) that I can do to provide me with a little more low end torque?

    I have a 1970 that I use around the homestead for odd jobs and would like a little more low end grunt.

    Ron

  2. #2
    Join Date
    Jul 2018
    Location
    TN
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    1,065
    That would depend greatly on your budget and how far you wanna go.
    There have been some pretty serious upgrades done on those over the years.
    I was born and raised on Venus & I may be here a while.....

  3. #3
    Join Date
    Jul 2010
    Location
    Pekin IL
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    529
    What are you trying to pull, I have always been pretty impressed with what the little 90s could do. Are your clutches maybe slipping? I never had one of the US 90s but don't they have a Hi-Lo gearbox?

    Sent from my SM-G935V using Tapatalk
    1985 250r
    1985 200s
    1984 200x
    bandito x2
    1979 atc70
    Trikefest 2012,13,14,15

  4. #4
    barnett468 is offline FACT ! I have no edit button Arm chair racerThe day begins with 3WW
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    minnesota
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    5,911
    Quote Originally Posted by Cribbs74 View Post
    Apart from a sprocket change is their anything available engine wise (cam) that I can do to provide me with a little more low end torque?

    I have a 1970 that I use around the homestead for odd jobs and would like a little more low end grunt.

    Ron
    Other than changing the sprockets to a numerically higher gear ratio, the only way to obtain an appreciable increase in low end power is to increase the engines displacement with a big bore kit. Simply increasing the compression with a high compression piston will increase the low end power a little but if you increase it enough, you then need to run race fuel etc, and changing the cam to a "torque" cam (if one is even available) would only slightly increase low end power.

  5. #5
    Join Date
    Mar 2016
    Location
    Oklahoma city
    --
    26
    So, all I want is a little, more so for hills and such, it just seems like I can only pull in first gear in low range. So getting from one place to another takes a little time. Most times I am just dragging around a wagon and use it to haul wood, brush tools etc.

    I’ve thought about clutch slippage, but it doesn’t feel like it as the engine just loads up and won’t move the trike. It runs great unloaded with just me on it. It’s timed correctly, carb rebuilt, new plug and air filter. Basically it’s tuned as well as it can be, starts first pull. Perhaps it just needs the too end done, I do get a puff of blue out of the exhaust once and a while. That said finding US90 pistons and clutch parts isn’t really easy. I see plenty of CT90 parts, do they interchange?

  6. #6
    barnett468 is offline FACT ! I have no edit button Arm chair racerThe day begins with 3WW
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    Quote Originally Posted by Cribbs74 View Post
    Perhaps it just needs the too end done, I do get a puff of blue out of the exhaust once and a while.
    In your particular case, even if you have a significant amount of compression loss from worn rings etc, a new top end will still not increase low end power by an appreciable amount. You prey much need to either install a big bore kit or live with it the way it is....unless you add a nitrous bottle.

  7. #7
    Join Date
    Mar 2016
    Location
    Oklahoma city
    --
    26
    Sounds like a big bore kit is in order then. I see 54mm pistons available, but no cylinders is it safe to assume I can bore the standard cylinder to 54MM? What about exhaust and carb? Can I get by with a re-jet to get the most out of it or should I get a 110 carb? I would prefer not to change the exhaust as it took me forever to find the correct one.

  8. #8
    Join Date
    Nov 2015
    Location
    Davenport iowa
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    1,144
    Or maybe buy a 125m.
    How about a pic of this 90 Ron?
    Last edited by DAM shop; 03-11-2019 at 07:08 PM. Reason: Because I can
    90 nickolson Bored and Stroked "The Good"

    Big Bore 110 Pauter frame "The Bad"

    90 Bored and Stroked “vey’s frame” "The Ugly"

    110 JSC frame Bored and Stroked
    flat track build. “Shop trike”

    1974 original 90 X 2

    1974 Original 70.

  9. #9
    Join Date
    Mar 2016
    Location
    Oklahoma city
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    26
    Quote Originally Posted by DAM shop View Post
    Or maybe buy a 125m.
    How about a pic of this 90 Ron?
    Click image for larger version. 

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    Click image for larger version. 

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    Taken after hauling firewood yesterday. I had the whole gang out yesterday for a spring dusting off.

  10. #10
    barnett468 is offline FACT ! I have no edit button Arm chair racerThe day begins with 3WW
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    Quote Originally Posted by Cribbs74 View Post
    Click image for larger version. 

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    Taken after hauling firewood yesterday.

    ummm...it's Kawasaki Green, so does this mean that Honda was hoping some people may mistake it for a KAWASAKI....Makers Of The Most Powerful 3 Wheelers In The Universe, and accidentally buy it, instead of a real KAWASAKI?


    OMG...time to order some new Depends!

    ...

  11. #11
    gimmeamidget is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    Jun 2014
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    utah
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    434
    I was thinking if you put some rubber on the trailer wheels you may not require as much low end to pull it around.

  12. #12
    Join Date
    Nov 2015
    Location
    Davenport iowa
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    1,144
    Quote Originally Posted by barnett468 View Post
    ummm...it's Kawasaki Green, so does this mean that Honda was hoping some people may mistake it for a KAWASAKI....Makers Of The Most Powerful 3 Wheelers In The Universe, and accidentally buy it, instead of a real KAWASAKI?


    OMG...time to order some new Depends!

    ...
    Dam Barns, that was funny
    90 nickolson Bored and Stroked "The Good"

    Big Bore 110 Pauter frame "The Bad"

    90 Bored and Stroked “vey’s frame” "The Ugly"

    110 JSC frame Bored and Stroked
    flat track build. “Shop trike”

    1974 original 90 X 2

    1974 Original 70.

  13. #13
    Join Date
    Nov 2015
    Location
    Davenport iowa
    --
    1,144
    Quote Originally Posted by Cribbs74 View Post
    Click image for larger version. 

Name:	2D8F8FA8-629F-4FFC-90AA-DB75CFD71AC6.jpg 
Views:	29 
Size:	1.62 MB 
ID:	257680

    Click image for larger version. 

Name:	6CCE1734-B335-494C-8044-7590771BA546.jpg 
Views:	39 
Size:	1.86 MB 
ID:	257681

    Taken after hauling firewood yesterday. I had the whole gang out yesterday for a spring dusting off.
    Looks good. If it was me I would keep it the way you have it use it for pleasure. Buy yourself a beater let's say 125 or even a 185. You'll have so much money wrapped up in that with performance upgrades and it will still be sub par for what you want it for. IMO
    90 nickolson Bored and Stroked "The Good"

    Big Bore 110 Pauter frame "The Bad"

    90 Bored and Stroked “vey’s frame” "The Ugly"

    110 JSC frame Bored and Stroked
    flat track build. “Shop trike”

    1974 original 90 X 2

    1974 Original 70.

  14. #14
    Join Date
    Mar 2016
    Location
    Oklahoma city
    --
    26
    It’s supposed to be Parrot green I assume. I didn’t paint it. It came to me that way. The rest of the joke went over my head.

    Yes, rubber would be good, they roll just fine on the grass probably with less rolling resistance on the thin steel than with rubber. Glad I could provide you with some humor.

    ATC’s aren’t super common around here and the ones that do pop up need some serious work. So if I am going to spend money might as well do it with what I have.

    Ron

  15. #15
    Join Date
    Nov 2015
    Location
    Davenport iowa
    --
    1,144
    If you wanted to split the cases I have a stroker crank I would sell
    90 nickolson Bored and Stroked "The Good"

    Big Bore 110 Pauter frame "The Bad"

    90 Bored and Stroked “vey’s frame” "The Ugly"

    110 JSC frame Bored and Stroked
    flat track build. “Shop trike”

    1974 original 90 X 2

    1974 Original 70.

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