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Thread: Porting the 361 Big Bore

  1. 01-23-2009, 05:47 AM #151
    mtfallsmikey
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    Stupid Question Friday

    Brad; In your HO, would it make sense to do the BB rebuild/mods on a busted361 that could be had cheep, vs. buying a 440/441 assuming same bar length?
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  2. 01-23-2009, 05:50 AM #152
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    There's no replacement for displacement. A ported 440's going to walk on a 361BB. Now if you're just looking for more power in a lighter weight package, then sure, build the 361. If the 361 is cheap enough, I'd jump on it. I don't think you'd be disppointed in a stock 361BB and a muffler mod. A port job will just give you that much more. If you don't like it and want a 440, you can always sell it.
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  3. 01-23-2009, 06:31 PM #153
    parrisw
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    Quote Originally Posted by blsnelling View Post
    I opened it up, probably close to 2mm. I first had to remove the brass nozzle, then replaced it after the bore was increased.
    Did you have to make a bigger throttle plate?
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  4. 01-23-2009, 06:57 PM #154
    Lakeside53
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    I suspect he bored the venturi portion only
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  5. 01-23-2009, 07:00 PM #155
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    Quote Originally Posted by Lakeside53 View Post
    I suspect he bored the venturi portion only
    Ok, that makes sense.
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  6. 01-23-2009, 07:21 PM #156
    blsnelling
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    Quote Originally Posted by Lakeside53 View Post
    I suspect he bored the venturi portion only
    That is correct. I'm using the same throttle and choke plates.
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  7. 01-23-2009, 07:29 PM #157
    yo2001
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    So there is no ill effect from not having a venturi?
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  8. 01-23-2009, 07:33 PM #158
    wkpoor
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    Brad, you are long over due for a log stand or racing stand and cants for testing!
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  9. 01-23-2009, 07:47 PM #159
    blsnelling
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    Quote Originally Posted by yo2001 View Post
    So there is no ill effect from not having a venturi?
    I do get a little run on at times when coming off WOT. But that's usually not an issue when cutting with it. Occasionally it will just die when you come out of a cut. One pull and it comes right back to life. So if it's your only saw and it's only for work, I don't recommend this mod. It's been recommended to try increasing the popup pressure and see if that helps. I haven't had a chance to do that yet.
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  10. 01-26-2009, 10:56 AM #160
    treefrog359
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    brad have you had time to work on your 361 carb yet? did you adjust the pop off presure yet?
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  11. 01-26-2009, 11:12 AM #161
    blsnelling
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    Sorry, I have not. Been working on other saws the last few days.
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  12. 01-26-2009, 11:18 AM #162
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    Brad .....slow down or the Ohio saw god will get mad that your taking all his winter time business away......


    I see a race chains in your future ......




    .
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    I suffer from CAD...........







    BAD GAS IS A KILLER OF ANY 2-STROKE!!!
    .Plenty of saws..............

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  13. 01-26-2009, 11:21 AM #163
    blsnelling
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    Quote Originally Posted by 04ultra View Post
    Brad .....slow down or the Ohio saw god will get mad that your taking all his winter time business away......


    I see a race chains in your future ......
    LOL. Chains will be made before the spring GTG. How far I go with them we'll have to see.
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  14. 01-26-2009, 11:25 AM #164
    04ultra
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    Quote Originally Posted by blsnelling View Post
    LOL. Chains will be made before the spring GTG. How far I go with them we'll have to see.
    Brad ...I have a 375 that you could get some ideas off of .........It was to fast for cutting concrete ....
    Last edited by 04ultra; 01-26-2009 at 11:27 AM.
    .





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    .Plenty of saws..............

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  15. 01-26-2009, 11:41 AM #165
    blsnelling
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    Quote Originally Posted by 04ultra View Post
    Brad ...I have a 375 that you could get some ideas off of .........It was to fast for cutting concrete ....
    Is that the 75cc 372, or a different saw all together?
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