Koso 170 4v build parts list. Anything Missing?
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Koso 170 4v build parts list. Anything Missing?

This is a discussion on Koso 170 4v build parts list. Anything Missing? within the Grom Talk forums, part of the Honda Grom Forums category; I am going to do a BBK for my buddy's Monkey. Here is the parts list. Anyone have suggestions of anything we are missing? Any ...

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Thread: Koso 170 4v build parts list. Anything Missing?

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    Koso 170 4v build parts list. Anything Missing?

    I am going to do a BBK for my buddy's Monkey. Here is the parts list. Anyone have suggestions of anything we are missing? Any important mods to make the set more reliable? Thanks!


    • Koso 170cc bottom end and Koso 4 valve top end
    • Koso 34mm Throttle body
    • Drow Sports Oil cooler
    • Takegawa high flow oil pump
    • Drow Sports Heavy duty clutch plate
    • Upgraded clutch springs
    • Koso Timing chain tensioner
    • Koso 10-hole Fuel injector
    • Koso Injector adapter
    • Correct NGK spark plug for 4 valve head
    • Kitaco clutch cover
    • 16t front sprocket
    • Takegawa crankshaft support 4th bearing
    • Gromfatherz Crankcase breather
    • aRacer RCMini5 ECU
    • Proper Dyno Tune


    Anything else that we really ought to add? Thanks!




    (Posted in Grom forum because there seems to be a lot more action here)

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    Quote Originally Posted by ia02 View Post
    I am going to do a BBK for my buddy's Monkey. Here is the parts list. Anyone have suggestions of anything we are missing? Any important mods to make the set more reliable? Thanks!


    • Koso 170cc bottom end and Koso 4 valve top end
    • Koso 34mm Throttle body
    • Drow Sports Oil cooler
    • Takegawa high flow oil pump
    • Drow Sports Heavy duty clutch plate
    • Upgraded clutch springs
    • Koso Timing chain tensioner
    • Koso 10-hole Fuel injector
    • Koso Injector adapter
    • Correct NGK spark plug for 4 valve head
    • Kitaco clutch cover
    • 16t front sprocket
    • Takegawa crankshaft support 4th bearing
    • Gromfatherz Crankcase breather
    • aRacer RCMini5 ECU
    • Proper Dyno Tune


    Anything else that we really ought to add? Thanks!




    (Posted in Grom forum because there seems to be a lot more action here)
    You may need an intake (I'm not familiar with the Monkey) and be sure to get the brass screw for the KOSO Throttle Body.
    2018 Grom
    Drow LS 181cc / Koso 4v Head / PCV / WBO2
    Koso 34mm TB / PCX150 FI / Hindle Exhauast / Drow CF Intake with K&N
    Kitaco Clutch cover / SMR 60% Clutch Springs & Plate
    TST Finder Eliminator and Flush Mount Lights

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    Quote Originally Posted by skipr View Post
    You may need an intake (I'm not familiar with the Monkey) and be sure to get the brass screw for the KOSO Throttle Body.
    Forgot to mention, also has a Yoshimura full exhaust and MNNTHBX intake.

    The brass screw is a good call. Thanks

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    Your list looks good

    Port that head, send it to Kenny "GromFatherZ, at the same time do a complete port and polish of the koso throttle body and inlet tube.

    Speed spacer, GromFatherZ has them.

    have the head port match for both the intake port and the exhaust port matched with the I/D exhaust that you use.

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    I'd skip the strange and expensive Koso injector / adapter contraption and go with a 10 hole Forza 300 injector. Reference 16450-MGC-D21. It's plug & play.

    Also I'd really consider a Kitaco crank, you might get away with the stock crank and limited RPM but that kind of defeats the 4 valve purpose.

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    Quote Originally Posted by David View Post
    I'd skip the strange and expensive Koso injector / adapter contraption and go with a 10 hole Forza 300 injector. Reference 16450-MGC-D21. It's plug & play.

    Also I'd really consider a Kitaco crank, you might get away with the stock crank and limited RPM but that kind of defeats the 4 valve purpose.
    Thanks for that injector tip. That expensive Kosi injector has been bugging me. I just figured the PCX 150 was probably inadequate.

    Definitely debating the crank. I’ll give it some consideration.

    Thanks!

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    Quote Originally Posted by ia02 View Post
    I am going to do a BBK for my buddy's Monkey. Here is the parts list. Anyone have suggestions of anything we are missing? Any important mods to make the set more reliable? Thanks!


    • Koso 170cc bottom end and Koso 4 valve top end
    • Koso 34mm Throttle body
    • Drow Sports Oil cooler
    • Takegawa high flow oil pump
    • Drow Sports Heavy duty clutch plate
    • Upgraded clutch springs
    • Koso Timing chain tensioner
    • Koso 10-hole Fuel injector
    • Koso Injector adapter
    • Correct NGK spark plug for 4 valve head
    • Kitaco clutch cover
    • 16t front sprocket
    • Takegawa crankshaft support 4th bearing
    • Gromfatherz Crankcase breather
    • aRacer RCMini5 ECU
    • Proper Dyno Tune


    Anything else that we really ought to add? Thanks!




    (Posted in Grom forum because there seems to be a lot more action here)

    What’s the total price (approximately) for all those parts?
    2019 Honda Grom Gayety Red
    Anodizing Racing “Amazon Special” Exhaust
    Michelin Power Pure Tires
    Neverlandback Stealth Style Mirrors
    Vagabond Motorsports Fender Eliminator and Cargo Rack
    Givi B29 Monoblock Trunk

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    Quote Originally Posted by Alpine1.0 View Post
    What’s the total price (approximately) for all those parts?
    Give or take $2500

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    Quote Originally Posted by ia02 View Post
    Give or take $2500
    seems about right but you can go on ebay and get the oil cooler "5 row unit" for a lot cheaper and make your own oil lines.

    I would get the yuminashi wheel that goes into the cylinder wall to help guide the cam chain
    HEAVY DUTY CAM CHAIN GUIDE (Z125 MONKEY - MSX/GROM & SF - WAVE125i) - YUMINASHI DIRECT SALES

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