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My Takegawa 181-4v build started today, tearing down my BrianS 170

This is a discussion on My Takegawa 181-4v build started today, tearing down my BrianS 170 within the Grom Talk forums, part of the Honda Grom Forums category; There's a good reason why that metal tensioner failed and it's very specific to what the owner did. Also with rubber wheels, over time the ...

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Thread: My Takegawa 181-4v build started today, tearing down my BrianS 170

  1. #21
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    There's a good reason why that metal tensioner failed and it's very specific to what the owner did.

    Also with rubber wheels, over time the rubber chips away. It's not a thing you can just change every 500 miles and expect your bike to perform the same.

    Brand new, it will act like a champ. After 100 miles, your bike will run different, so on an so on until the point where there is no more rubber at all and your bike won't even idle or have power.

    How do I know this? from personal experience.

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    Why doesn't someone just make a delrin or acetal slider that utilizes a pivot bearing to replace the wheel? Having a longer contact patch with the cam chain will reduce it's own wear, and when it does wear, it will keep more even contact with the chain resulting in less of a fall off on the chain tension.

    on second thought I guess a rolling wheel will still wear less than a slider in constant contact with the chain.
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    I'm pretty sure there is a guy doing that.

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    grom case is split today, lots of glitter-metal filings, the transmission gears are out and just cleaning out the case and I will install all new bearings and parts that will make the engine run like brand new since it has close to 10K miles on the case from the old BrianS 170 build.

    I noticed that the Takegawa 5 speed transmission kit did not come with any bearings, so I assume the stock bearings will work or should I replace it with better bearings?

    Yep it looks like I might be able to have the grom running by the first of June.

    Grom case split


    stock 4 speed transmission gears removed

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    look at the picture. the wheel was off center from the chain sideloading it. the beaing is toward the case in the chain, not centered over the middle of the roller. of course it failed, it was side loaded.

    funny, i have the first one ever as it was MY idea in the first place. no issues. Also, Alan is building them right.

    when these are installed the sprocket must be lined up over the center of the chain, this is up to the installer to get right. if they don't, the installer MUST align the arm to make sure this happens. the idea monkey father has about the weight carrying is just incorrect speculation. its a toothed gear, it has no bearing on it (pun intended).

    My Takegawa 181-4v build started today, tearing down my BrianS 170-17191314_1265118213571885_4155412761699731652_n.jpg
    Too many toys? nah. 09 Ducati sport classic, 74 rd350 LC hybrid, 73 RD350, 73 Kawasaki S2a, 67 Kawasaki C2TR 120 Roadrunner, 71 Kawasaki G3SS powered by a CR85 liquid cooled lump, 74 Moto-Morini 3 1/2 strada, 84 Yamaha RZ350, 1962 Ford falcon, 76 Ford maverick, very early 1970 non-us Spec Yamaha R5, 89 Yamaha DT50 bought NEW in 2015, 2015 KTM 390 Duke, 72 yamaha CS5.. . oh.. and 2014 Honda Grom with lots of mods.. (some useful, most not)

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    Quote Originally Posted by m in sc View Post
    look at the picture. the wheel was off center from the chain sideloading it. the beaing is toward the case in the chain, not centered over the middle of the roller. of course it failed, it was side loaded.

    funny, i have the first one ever as it was MY idea in the first place. no issues. Also, Alan is building them right.

    when these are installed the sprocket must be lined up over the center of the chain, this is up to the installer to get right. if they don't, the installer MUST align the arm to make sure this happens. the idea monkey father has about the weight carrying is just incorrect speculation. its a toothed gear, it has no bearing on it (pun intended).

    Click image for larger version. 

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    Wow what happened to the teeth of that wheel???

    yep you had the first idea for the tooth gear cam chain tensioner arm, and I gave Alan the p/n for the wheel and he started building them. The p/n I got from you.

    I'm going to mount my gear toothed cam chain wheel on my modified Kitaco arm which I milled down the pin so it would go through the bearing with out binding.

    Wait till I get my third DIY oil catch can built "takegawa clone", I will share the design and how to on this website for free so others don't have to spend the big bucks to buy the expensive takegawa unit.

    I have to go pick up some gray gasket sealant tube for the engine case once I get the crank bearings press out and the new Kitaco bearings pressed in.

    My last job will be to port match my Koso 34mm inlet tube to my Takegawa inlet port of the 4v head, might do a complete porting and flow testing at the same time.
    Last edited by CiscoSanJose; 04-21-2017 at 12:55 AM.

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