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Squirrel's 143 Build

This is a discussion on Squirrel's 143 Build within the Grom Builds forums, part of the Honda Grom Forums category; I just read through a post about making a new linkage and it'll probably be something I do once I get the fueling figured out. ...

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Thread: Squirrel's 143 Build

  1. #11
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    I just read through a post about making a new linkage and it'll probably be something I do once I get the fueling figured out. I'll need to buy the stock shifter too
    50-50 likes this.
    2014 Grom
    Takegawa 143cc kit with S stage cam
    Kitaco clutch cover
    Takegawa oil pump with SUP modded catch
    PCX 150 injector
    SMR 6 disc clutch and 60% springs
    Koso clutch plate
    Opmid temp gauge
    Innovate MTX-L Plus AFR gauge
    EFIE
    Ebay exhaust, intake, and a bunch of other parts
    Seat Concepts seat
    OTB chain adjusters w/ spool
    14T/36T sprockets
    Pirelli SL26 tires

  2. #12
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    tooter's Avatar
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    Your bike looks great and I like your approach of trying things out to see how they work. How does the 143 compare to the 125?

    Following your build with interest!
    LordSquirrel likes this.
    2018 GROM: Modified for reliability longevity gas mileage... and fun.

  3. #13
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    Thanks!

    You learn a lot through trial and error.

    The 143 is what I was looking for. Riding around town I'm not thinking "I wish I had just a little more power." I'm 5 10 at 225lbs and 4th gear still pulls up a medium sloped hill with the 14/36 sprockets. It's kinda a weird feeling when you're so used to having to shift down. I'm probably going to have to switch the sprockets up a bit if I want to do some highway riding. Maybe a 15 front will be enough, but I'll cross that bridge once I get to it.

    I've been mostly cruising at 5500rpm in 4th gear at a little over 40mph indicated. If it stays nice outside today I'll find my gopro and record my rpm, temp, afr, and if I can get it in the shot my gps speed.


    Also Tooter I'll get a fuel economy number as well once I get the fueling under control.
    Last edited by LordSquirrel; 07-10-2019 at 11:26 AM.
    50-50 likes this.
    2014 Grom
    Takegawa 143cc kit with S stage cam
    Kitaco clutch cover
    Takegawa oil pump with SUP modded catch
    PCX 150 injector
    SMR 6 disc clutch and 60% springs
    Koso clutch plate
    Opmid temp gauge
    Innovate MTX-L Plus AFR gauge
    EFIE
    Ebay exhaust, intake, and a bunch of other parts
    Seat Concepts seat
    OTB chain adjusters w/ spool
    14T/36T sprockets
    Pirelli SL26 tires

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  5. #14
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    Lord Squirrel,

    Thanks for starting this build thread. I am also interested in many of your results and modifications.

    I look forward to more of your reports.

    Paul
    50-50 likes this.

  6. #15
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    Short but hard riding today. I threw in a new spark plug before I headed out.

    Initial start looked good. No flooding this time.

    I rode it like I stole it today and it responded well. AFR were hovering around 12.8 or 12.9 during cruising. Throughout the rpms it would stay around that area as well.

    I took it on the highway and I love it. I only did about 2 miles to one exit then 2 miles back. The highways around here are 60mph speed limit but people usually do 70ish. I kept up with traffic easily and actually passed people with no tuck. Just normal seating position. Indicated was 68 and I didn't need wot to keep that speed. Afr was 12.5 for when I was normal cruising. WOT on the initial 2 miles stayed at 11.2. On the way back it was 12.0 but one way is slightly up hill and the other is of course the opposite.

    Idle is getting better slowly. Still some instances where it wants to drop down it about 10.7ish. Mostly it stays in the upper 12s or around 13.0.

    Temp on the highway got to 235. When I was stopped at a red light right after I got off it creeped up to 245. Once I started moving again it went down to 230 and stayed there. It was 90 outside with 70% humidity here.

    I pulled the plug once I got back and other than the ground strap being a light brown color throughout, it didn't look like it changed at all.

    No gopro today. All my batteries were dead.

    Oh and the engine vibrates a lot at these speeds.
    Last edited by LordSquirrel; 07-10-2019 at 07:14 PM.
    2014 Grom
    Takegawa 143cc kit with S stage cam
    Kitaco clutch cover
    Takegawa oil pump with SUP modded catch
    PCX 150 injector
    SMR 6 disc clutch and 60% springs
    Koso clutch plate
    Opmid temp gauge
    Innovate MTX-L Plus AFR gauge
    EFIE
    Ebay exhaust, intake, and a bunch of other parts
    Seat Concepts seat
    OTB chain adjusters w/ spool
    14T/36T sprockets
    Pirelli SL26 tires

  7. #16
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    KBK0's Avatar
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    very interesting to read. thank you for sharing your impressions

  8. #17
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    Quote Originally Posted by LordSquirrel View Post
    Then I forgot to cover the hole into the crank case and a c clip flew off into what I though was the crank case. I was so defeated when that happened. Luckily it was in that slot where the cam chain goes and it's a magnetic material so all was good.
    lol I hate C clips, those can either magically disappear or spontaneously take off for a flight... and eventually disappear.

    Nice wright up!
    LordSquirrel likes this.

  9. #18
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    Rode to work today which included back roads and 6 miles of highway. AFRs look good. Stayed below or at 13.0 for most of the back roads and in the 12s for the highway. WOT on the highway will drop it down to the 11s, but other than initial acceleration or over taking I didn't need WOT.

    Temp stayed at 225 on the highway. When I got off it crept up to 235. I may explore some heat dissipating options just as an experiment. Another thing that's been on my mind is crank case venting. I'm not sure where I want to go with that. Thoughts?

    The only problem I have right now is the idle afr. I thought it was getting better, but now it's staying in the 10s more. I'm going to play with the idle screw on the throttle body and see if that helps. The pcx150 injector equivalent on Yuminashi's website says you have to adjust the idle screw if using that injector so maybe that's the fix. I hope so because I'm pretty satisfied with how this combo is working.
    Last edited by LordSquirrel; 07-12-2019 at 11:06 AM.
    2014 Grom
    Takegawa 143cc kit with S stage cam
    Kitaco clutch cover
    Takegawa oil pump with SUP modded catch
    PCX 150 injector
    SMR 6 disc clutch and 60% springs
    Koso clutch plate
    Opmid temp gauge
    Innovate MTX-L Plus AFR gauge
    EFIE
    Ebay exhaust, intake, and a bunch of other parts
    Seat Concepts seat
    OTB chain adjusters w/ spool
    14T/36T sprockets
    Pirelli SL26 tires

  10. #19
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    Half day Fridays! Yay!

    Took the same way home. Averaged 68 indicated. Got behind a truck and drafted to 72 indicated.

    WOT afr was 11.2. Temp stayed under 220 the whole time. Cruising on back roads dropped the temp to under 210. It's mid 70s out.

    Idle is definitely staying in the mid 10s. Will work on that and change the oil after lunch. I have 100 miles on the new build. Still very happy.

    I bought this too https://theruckshop.com/product/trs-...r-made-in-usa/
    2014 Grom
    Takegawa 143cc kit with S stage cam
    Kitaco clutch cover
    Takegawa oil pump with SUP modded catch
    PCX 150 injector
    SMR 6 disc clutch and 60% springs
    Koso clutch plate
    Opmid temp gauge
    Innovate MTX-L Plus AFR gauge
    EFIE
    Ebay exhaust, intake, and a bunch of other parts
    Seat Concepts seat
    OTB chain adjusters w/ spool
    14T/36T sprockets
    Pirelli SL26 tires

  11. #20
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    Quote Originally Posted by LordSquirrel View Post
    Looks good but the GF cover would have helped with venting. But it's also 3x the price...

    I've no experience with the EFIE but I'd try to adjust it a bit, AFRs you are reporting are pretty rich.

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