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Finbro superhead quality = meh

This is a discussion on Finbro superhead quality = meh within the Grom Talk forums, part of the Honda Grom Forums category; Lmao yet another reason I’ll stick to a stock head if I do go up in bore.. What a joke for customer service...

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Thread: Finbro superhead quality = meh

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    Strokd_GE's Avatar
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    Lmao yet another reason I’ll stick to a stock head if I do go up in bore.. What a joke for customer service

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    once cleaned up it did work REALLY well, i will say that much. *some assembly required lol
    A bunch of old stuff that runs. 2stroke grom build...in process.. eventually...

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    Quote Originally Posted by Strokd_GE View Post
    Lmao yet another reason I’ll stick to a stock head if I do go up in bore.. What a joke for customer service
    What are the other reasons?

    It's obvious the stock head is very restrictive.

    Sent from my LEX727 using Tapatalk

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    do u think that it is the same that finbro sell?
    Tuningcylinderhead MSX 125,

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    Quote Originally Posted by Cheburashka View Post
    What are the other reasons?

    It's obvious the stock head is very restrictive.

    Sent from my LEX727 using Tapatalk
    Some other reasons are outlined in the first post of this thread.

    A stock head, yes. The valves are big enough to make plenty of power for my needs, just needs decent port work

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    Finbro works great, see what online paying vendors who are still selling Finbro motors and parts.

    BBK heads and such from various vendors I would still go over the head and valves and do my own porting and lapping just so that I know it will work to my inspection/specification.

    Speed cost money and also re-inspection of parts and maybe a little fine tuning/porting/sanding/filing just to make it the way you want. I do that all the time.

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    I've heard that these finbro superheads came with offset valve guides, bit did not correct the angle of offset in valve spring rests (valve guides are at the wrong angle positioned to valve springs), so they will wear out fast.

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    im pretty sure for the bigger valves, they just machine new seats and barely increase the smallest diameter of the runner.
    (from what i have seen in pics)

    woah woah woah. pump the brakes.


    are these aluminum shavings?
    Last edited by turpinator; 11-08-2017 at 09:35 PM.

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    Those aren't shavings, just the original head castings that was never touched.

    The 26.5/22mm finbro head I use maybe got me 2 mph top speed on a 181cc. I touched up the combustion chamber and ported the intake and exhaust ports myself. First time doing it and got another 5 mph top speed out of it. Took out 10 long hours. Long, but enjoyable experience. The reason why I got the Grom in the first place was to tinker with it anyways.

    Finbro superhead quality = meh-img_3531.jpgFinbro superhead quality = meh-img_3532.jpgFinbro superhead quality = meh-img_3533.jpg
    m in sc likes this.

  11. #30
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    Quote Originally Posted by x-reaper View Post
    I've heard that these finbro superheads came with offset valve guides, bit did not correct the angle of offset in valve spring rests (valve guides are at the wrong angle positioned to valve springs), so they will wear out fast.
    Numerous people have found this issue. Whether it's since been fixed I'm not sure, but the problem is known to exist.

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