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Thread: Honda ATC 185/200 Porting

  1. #1
    Join Date
    Mar 2008
    Location
    Tug Hill
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    1,282

    Honda ATC 185/200 Porting

    I'm once again offering my 185/200 Honda ATC porting. You ship me your head I send you pics once the work is done at which time you pay me and I pay to send it back priority mail. Trail port is 100 race port is 125. My work is professional and immaculate. I've done dozens of these heads and do my best work. Every customer has been more than satisfied with the work and retained reliability of the head. I use a sonic depth checker to ensure there is enough material left between the runner and the valve spring seat and I do work to all areas of the port as needed including the runner, the short and long turn radius, and the bowl. I also do work on the combustion chamber to help improve the flow past the valves ensuring the bigger ports can actually fill the cylinder.
    My porting obviously works the best with other mods but I can trail port the head to make horsepower on an otherwise stock engine.

    I also port other 4 stroke and 2 stroke engines depending on what they are. If I accept a job it means I am 100% positive I can deliver an exceptional product and you won't be disappointed.

    P.M. me if you are interested. like I said I can do many other engines but my true love is the old Honda 200 engines. I ported my first Honda 200 at the age of 12 and by 13 I had an oversized carb and welded my own custom head pipe. Many kids in my neighborhood had 185's and 200's and none could keep up thus I started building their engines and it all began. Since then I have worked at multiple performance shops and was the head mechanic at 2 of them. I know what I'm doing but I'm not too proud to turn down something I'm either not familiar with or I know I can't improve on. I absolutely refuse to make money on a job that doesn't deliver horsepower and retained reliability.

  2. #2
    6bt's Avatar
    6bt is offline At The Back Of The Pack Arm chair racerAt the back of the pack
    Join Date
    Jan 2017
    Location
    near Syracuse NY
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    318
    Sweet, I live south of syracuse, I'll keep ya in mind.

    Sent from my XT1254 using Tapatalk

  3. #3
    Join Date
    Mar 2008
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    Tug Hill
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    cool. heres a couple pics. these are unfinished but getting close. they are the only pics I have most of my porting stuff was on my hard drive that crashed. these I happened to have uploaded to facebook lol

  4. #4
    Join Date
    Oct 2013
    Location
    Chandler, AZ
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    99
    GTH,

    Can you tell me the difference in the tail and race ports with respect to both what you do and also how do each of these affect the powerband of the engine? I have a Supertrapp/K&N, an XR cam, and an XR carb which can also be installed. Additionally, do you recommend new valves with stiffer springs be used with a porting job?
    Have you ever used/tested results on a flow bench?

    Thanks so much!

  5. #5
    Join Date
    Mar 2008
    Location
    Tug Hill
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    1,282
    I do recommend new valves but if the current valves are in spec I do a mild lapp on them when I reassemble the head. I recommend aftermarket springs if your going to run a big cam. With the xr cam it couldn't hurt but the stock springs would be ok for a trail set up. Trail porting I open the runner some but bigger isn't always better as the bigger the runner is the less port velocity your going to have. so after opening the runner a bit I work on the long and short turn radius to open them up and get the angle of flow correct I also open up the bowl area and work on the angle where the seat meets the port and I shape the valve seat for the least disturbance in flow possible and also to help direct the flow. I finish the intake with various grit sand paper. Where the flow is good its a mild sand paper and where the flow will inevitably be slower such as the floor of the intake I use a coarser grit to help keep the fuel atomized. The exhaust port I finish to a polish for optimum flow as your not worried about fuel atomization on the exhaust side. My race porting is usually only used when accompanied by a bigger cam, bored or aftermarket carb and a larger exhaust. I use a sonic depth checker to open the bowl and radius' as much as possible without breaking into the valve spring seat and I also do some combustion chamber work with race porting and recommend at least the 10.25:1 comp piston to go with it as the chamber work does add to the cc of the chamber and lowers compression slightly. The 10.25:1 piston is a great mod for these engines and is able to be run on 93 octane.

  6. #6
    Join Date
    Mar 2008
    Location
    Tug Hill
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    1,282
    Another option if you have the 185/200 engine is to use a 200x piston. Its slightly higher compression.

  7. #7
    Join Date
    Jun 2010
    Location
    Buffalo, NY
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    1,993
    Theres a 200 class at Paradise Speedway in the summer, you should go check it out sometime. Also, we race Unadilla with the quads in July, that's great race that's pretty close to you too. I hope to meet you this summer
    Looking for a Bassani silencer for a 2nd gen tecate, the style with the movable mount. 1st gen will work

  8. #8
    Join Date
    Mar 2008
    Location
    Tug Hill
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    Quote Originally Posted by 86T3 View Post
    Theres a 200 class at Paradise Speedway in the summer, you should go check it out sometime. Also, we race Unadilla with the quads in July, that's great race that's pretty close to you too. I hope to meet you this summer
    ya that would be cool if we seen each other there. I got that outlaw 525 I'm building I might race that. they are heavy but the independent rear suspension is killer it handles like a dream

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