Takegawa 143 Big Bore Kit for the 2019 Honda Monkey

[@NotMe-st8qc]

Always check the end gap of the ring inside the cylinder before installing them on the piston. You should be able to check this with a feeler gauge. There should be at least .0035” of gap x inches of cylinder diameter. With this bore size that requires a minimum of .008” of gap to avoid over expansion of the ring in the cylinder. There has to be a gap to allow for expansion. Failure to gap will cause the rings to seize in the cylinder. There is a tolerance on the gap. I would estimate ideal to be between .008-.015” of gap. Too big a gap and you will get increased crankcase pressure from blow by and increased oil consumption. Also install lubricated rings on piston. Also lubricate wrist pin and wrist pin bushing. Verify circlip that holds wrist pin in is firmly seated in groove inside piston. Increased bore also requires the replacement of the stock fuel injector with the injector for the 150cc Honda engine, Honda part# 16450-J36-K01. It’s a plug n play part that will make use of the increased bore and slight increase in compression afforded from the flat top piston in the big bore kit vs the sunken dome piston from the stock setup. Failure to change the stock fuel injector will result in an overly lean mixture that the ECU cannot compensate for. In essence you will seize the piston.

[@soulfaderx64]

Buy the whole kit with everything throttlebody, injector and ecu. Yes ringgap good point, i was thinking the same.

[@ayuse01]

Good explanation. Thanks

[@919_PEDRO]

Jesus, this bike is a Master piece! Keep it up my friend, greetings from Brazil.

[@hotrod7287]

Awesome! Looking forward to after break-in to see the performance difference.

[@wileecoyote5749]

2 mph gain

[@apio3810]

Can't wait for an update, great video.

[@stephensierchio1315]

Thanks! I have a CT 125 Trail 2021 model. Of course I want to improve without over stressing motor. I want to do a lot of riding via back roads this summer.

[@eastcoastish]

The CT125 is awesome, if you haven't yet, check out John5XR 's YT channel, he's done lots of cool mods to his.

[@tofumoto2514]

@@eastcoastish hey bro whats your verdict on thi kit?

[@eastcoastish]

@@tofumoto2514 it was ok, but ended up upgrading to the 181cc kit and have been running that for the last couple of years. Check out my other videos on the Monkey.

[@leslieaustin151]

When I was trained as a motor mechanic (in 60s) I was told that when tightening to a torque setting the manual should state whether ‘dry’ or lubricated. If you torque a ‘dry’ setting but use oil you will over-torque it, if the other way round it will be under-tightened. Les in UK

[@markwegner6100]

Keep us posted.

[@dohc_vtec_dj]

Just for future reference. The pin that holds the piston to the connecting rod is called a “wrist pin”

[@eastcoastish]

Thanks :)

[@mickyfinn7969]

Or “Gudgeon pin” in my neck of the woods. But we all knew what you mean so it’s cool. Thanks for the video. Did it run in ok ?

[@grantswiseman2164]

Which stand is that? And do you need special pegs for it to work with the monkey?

[@eastcoastish]

www.amazon.com/Pit-Posse-Motorcycle-Stand-Paddock/dp/B000VBOTSM It's a pretty cool stand because it can support the spools on my ZX6R, and for the Monkey, you just flip it around and the rubber-coated arms hold the rear swing arm - no spools required for the Monkey

[@catsbyondrepair]

Note you have to have the oil cooler for these big bore kits otherwise it will shit the piston and bore.

[@Team-Fraser]

Very informative video thanks! Out of interest why did you go for the 143 over the 181? @eastcoastish

[@eastcoastish]

Seemed like the 143 was more reliable and easy to keep cooler. My 181 kit is doing great though, in hindsight I don't see any reason to go 143 over 181.

[@Team-Fraser]

@@eastcoastish thanks for the reply. It's something I looking to do next year once I've done my full bike test, I'm only CBT on L plates just now. Sounds like 181 is the way to go.

[@endlesssummerfamily1374]

Watsup? What happened? I was thinking about the 143, but looks like yours may have failed. Did a ring fail? Piston looks a little chewed in the pic you posted today.

[@eastcoastish]

Just posted the update video: kzbin.info/www/bejne/m2KcgJyOp79mfMk

[@TeamDNFracing]

What you keep calling the connecting rod is a wrist pin. The connecting rod is the rod from the crankshaft to the wrist pin. Not trying to be a jerk, but I thought you might want to know this......

[@eastcoastish]

Yeh, I've since learned that, I appreciate the community making sure I'm using the right terminology.

[@mrilikecod1]

Can you do this to a trail 125?

[@eastcoastish]

Yes, same engine.

[@adventurouswarrior]

Excellent! 🙂

[@seffdog1177]

Worth the money??

[@khangduong599]

Không cần thay họng xăng vs kim phun vs ecu ư

[@kwameg.114]

How much faster is the bike after this install.. in general.. just an estimate ??

[@eastcoastish]

Top speed picked up a little bit (by a few mph), bottom end feels much punchier though.

[@chenteddy122]

Do you install new ECU to control the map?

[@eastcoastish]

Yes, I'm running the ARacer RCMini5

[@stevensalins256]

Great job, please let us know how it runs compared to 125cc as soon as you get it all broken in. I really want this for my 2020 Monkey!

[@catsbyondrepair]

Takegawa makes a 181cc for the super cub

[@Terk131]

@@catsbyondrepair I'm going for the DHM 186 KIT... Should be neat.

[@codyfinchum890]

Js but the rod you removed out of the piston isn't the connecting Rod it called the wrist pin great video other wise

[@eastcoastish]

Thanks!

[@soulfaderx64]

Try Lucas break in oil

[@Deceptolon]

Nice Seamaster

[@tlr-nut7275]

It's a TagHeuer Aquaracer.

[@brianrichard1768]

well explained. like

[@eastcoastish]

Thanks!

[@rayjay1753]

what kind of watch you wearing in this video

[@eastcoastish]

Tag Aqua Racer

[@chrisclemmons4802]

Any issues yet?! :)

[@eastcoastish]

LOL, stay tuned buddy, i'm editing the video now ;)

[@eastcoastish]

kzbin.info/www/bejne/m2KcgJyOp79mfMk

[@robertcowan8211]

IN ORDER FOR BIG BORE KIT TO PERFORM YOU ALSO NEED BIGGER VALVES, HEAD WORK , INCREASE FUEL AND SET TIMING TO MATCH NEW ENGINE CC,S. ITS A COMBINATION BUD....................

[@eastcoastish]

Hi, check out the other videos in the series, I've done ported and polished head, valves, fuel injector and have the stand alone aRacer engine management system.

[@HOPPOVERSION1]

Forget that it gives me anxiety just watching it lol

[@mobilgin]

Listen, if you are unhappy with a small bike and don't appreciate the work of Honda engineering -just buy a bigger bike.

[@eastcoastish]

lol, this idiot. if you’re bothered by modifying mini bikes you’re on the wrong channel.