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The start of the 7000 dollar money pit

This is a discussion on The start of the 7000 dollar money pit within the Grom Builds forums, part of the Honda Grom Forums category; powdered the stock rear sets today. oh how I wanted the billet rear sets but o how do I know they vibrate...

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Thread: The start of the 7000 dollar money pit

  1. #11
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    powdered the stock rear sets today. oh how I wanted the billet rear sets but o how do I know they vibrate
    Attached Thumbnails Attached Thumbnails The start of the 7000 dollar money pit-resized_20160812_111959_jpeg.jpg  
    Old Goat Ninja and procbandit like this.

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    ran across these pics today and even they aren't of a grom they are of one of my little toys with a horizontal grom style engine. I was in the pitbike scene pretty big 10 years ago mainly hot rodding the china motors. I did get this thing to crack 100mph as a 137 on NOS. and got very very close as a 173cc all motor before losing interest to something else.
    Attached Thumbnails Attached Thumbnails The start of the 7000 dollar money pit-picture251.jpg   The start of the 7000 dollar money pit-picture248.jpg   The start of the 7000 dollar money pit-picture237.jpg  

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    Quote Originally Posted by rkfinch23 View Post
    ran across these pics today and even they aren't of a grom they are of one of my little toys with a horizontal grom style engine. I was in the pitbike scene pretty big 10 years ago mainly hot rodding the china motors. I did get this thing to crack 100mph as a 137 on NOS. and got very very close as a 173cc all motor before losing interest to something else.
    Since you did the pit bike scene a while back and I assume these Chinese engines where air cooled HOW did you control the heat and esp the crank case vent or crank case pressure due to the high RPM causing the oil to heat up and air pressure to build up in the crank. Most of us are using oil catcher units but there must be a better solution to drain the oil back into the crank. I talked to a old Harley engine builder at the last Hollister biker event this pass 4th of July and he came up with a solution of drilling/tapping another crank case vent line/tube and he built some kind of one way valve and catcher unit that would release the air pressure build up but return the oil back into the motor. Thanks for any feed back.

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  5. #14
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    the MNNTHBX faux cover needed a trim job to fit the kitaco clutch cover but its on lol
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    a few more pics from 10 years ago cant wait to get ahold of the 4v head
    Attached Thumbnails Attached Thumbnails The start of the 7000 dollar money pit-picture223.jpg   The start of the 7000 dollar money pit-picture125.jpg   The start of the 7000 dollar money pit-picture121.jpg  

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    cisco believe it or not I don't remember it being a problem. we did vent the head as well as the crankcase. I can tell you that if its pushing/blowing oil somethings not right. weather it be the size of the crankcase vent or blow by. on our turbo bikes we are making way more power per hole and they don't blow anything plus on the big nasty bikes, they have vacuum pumps on the crankcase pumping pressure out. I'm getting ready to do a tak 181 4v and we will see. right now I'm figuring on maybe ditching the pcv and wideband in favor of the finbro ecu jus to get away from the stock ecu. id (like) to tryin keep the fuel injection
    Last edited by rkfinch23; 08-15-2016 at 09:18 PM.

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    rkfinch... Did you used to cruise on 50riders.com ?

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    yep lol..... I kicked off most of the mini sites because people where sending me heads to do lol

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    Quote Originally Posted by rkfinch23 View Post
    cisco believe it or not I don't remember it being a problem. we did vent the head as well as the crankcase. I can tell you that if its pushing/blowing oil somethings not right. weather it be the size of the crankcase vent or blow by. on our turbo bikes we are making way more power per hole and they don't blow anything plus on the bike nasty bikes, they have vacuum pumps on the crankcase pumping pressure out. I'm getting ready to do a tak 181 4v and we will see. right now I'm figuring on maybe ditching the pcv and wideband in favor of the finbro ecu jus to get away from the stock ecu. id (like) to tryin keep the fuel injection
    GSX is using the same Takegawa 181-4V but he is also using a carb instead of the F/I and he also got the HD crank/rod from Finbro but he had to put a bushing for the correct hole size for the piston wrist pin/rod connection and also drilled some oil holes in the bushing for oil lube. GSX is hitting 100+ mph and he also has a Tak 5 sp but said the Kitaco 5 sp is a better choice.

    I rode with a couple of guys with the Takegawa 181-4V super head BBK kit and those engines are the best, the only thing to look out for is the valve tappet tabs that sit on the valve they seem or look like the weak point of that kit. I was told if the rocker arm goes all the needle bearings go all over the engine causing big time failure to the engine internals.

    Right now I also have a Takegawa 181-4V super head kit and I also bought a Koso 34mm throttle body and inlet tube for this BBK and I will port match the Tak 181 head to match the hole size of the Koso inlet tube which is about 29-30mm. I also bought from HR the Kitaco crank and beefy connecting rod which has the right hole size for the wrist pin. Those will either go on one of my two groms which blows the engine first or I might buy a third grom and build that one from the ground up.

    Thanks for the feed back on the crank case pressure and crank case vent info.
    Last edited by CiscoSanJose; 08-15-2016 at 09:25 PM.

  11. #20
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    cisco you are more then welcome, I will know more after I get one of these things running. I do plan on cutting the hell out of the 4v head much less the 34mm tb. an engine is only an air pump and theres always more power to be had out of the head.

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