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Info Jetting up a MC22 for improved performance

Discussion in 'Honda 250cc In-line 4's' started by Damus, Jun 26, 2015.

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  1. Damus

    Damus She is a BEAST and riding it is comparable to sex Dirty Wheel Club

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    Its fun to mess with the carbs and try get more power, but my opinion is now rock solid on stock settings and properly tuned. But by all means try squeez out a pony! I will probably be reverting back to stock.
     
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    Damus, Jun 26, 2015
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  2. Mclaren

    Mclaren Well-Known Member Contributing Member

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    U can have all the ponies u like but unless u have it tuned it going to go bang
     
    Mclaren, Jun 26, 2015
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  3. Damus

    Damus She is a BEAST and riding it is comparable to sex Dirty Wheel Club

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    Did you do high flow air filter? Can I just say with the UNI-filter & can that even 15 12 12 15 wasnt enough imo.
    That being said I still didnt put the washers on the needles. The reason I think this is that when I use a little bit of choke it runs slighbtly better (even when warmed up).
    if you did filter and can I personally thing 10, 8, 8, 10 isnt enough.
     
    Damus, Jul 13, 2015
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  4. MCiN7

    MCiN7 Well-Known Member

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    I did, just going off a dyno that I've seen that had the printout for AFR's with unifilter, xcite shorty and 110+108's
     
    MCiN7, Jul 14, 2015
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  5. Mclaren

    Mclaren Well-Known Member Contributing Member

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    Best to run on dyno u can be way out all bikes are different could be better or worse needles etc...
     
    Mclaren, Jul 14, 2015
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  6. MCiN7

    MCiN7 Well-Known Member

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    Yeah got it booked in for Friday afternoon for a readout :)
     
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    MCiN7, Jul 14, 2015
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  7. Damus

    Damus She is a BEAST and riding it is comparable to sex Dirty Wheel Club

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    I am gonna do the needles then and see how it feels, if still no good I might push up to 17, 15, 15, 17 see how it feels hopefully by then it will be rich enough and I will get a dyno too lol. DYNO BATTLE!!! hahaha
     
    Damus, Jul 14, 2015
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  8. Mclaren

    Mclaren Well-Known Member Contributing Member

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    Wow that is big jets mate I think something ain't right
     
    Mclaren, Jul 14, 2015
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  9. Damus

    Damus She is a BEAST and riding it is comparable to sex Dirty Wheel Club

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    Well I was reading this article and the "math" is (dont quote me on this though) that the size of the jets is meant to be the diameter of the carb in mm x 5, so the mc22 carb size is 29mm x 5 = 145 jets. However due to air filter, headers, can ect the restriction brought it back to 105.
    But I think its plausible that with a hi flow air filter and unrestricted exhaust can it reaching around the 115's makes sense. But like you & most people say dyno tune lol. I am just trying to guess the correct setting and go by feel which is probably a horrid method of sorting it out.
     
    Damus, Jul 14, 2015
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  10. Mclaren

    Mclaren Well-Known Member Contributing Member

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    Can't remember mine but no where near that plus they got changed when it tuned but yes get a dyno run and get that air fuel mix right
     
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    Mclaren, Jul 14, 2015
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  11. Damus

    Damus She is a BEAST and riding it is comparable to sex Dirty Wheel Club

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    Did you run a uni filter or replace paper one with filter foam?
     
    Damus, Jul 14, 2015
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  12. Mclaren

    Mclaren Well-Known Member Contributing Member

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    I still run standard filter
     
    Mclaren, Jul 14, 2015
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  13. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    What a load of rubbish. Please stop reading nonsense it will rot your brain. :)
     
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    maelstrom, Jul 14, 2015
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  14. Damus

    Damus She is a BEAST and riding it is comparable to sex Dirty Wheel Club

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    Damus, Jul 14, 2015
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  15. Mclaren

    Mclaren Well-Known Member Contributing Member

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    There is no exact working as like said all bike wear different stock is 105 102 that is ur start point like I'm doing on 2nd bike and then dyno run and work from figures
     
    Mclaren, Jul 14, 2015
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  16. Damus

    Damus She is a BEAST and riding it is comparable to sex Dirty Wheel Club

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    Everything I talk about hypothetically or mathematically assumes perfect conditions.
    I am strictly talking about getting the correct fuel to air from the carb. We want to assume that the boots and seals and components are good and that the carbs are clean.
    If that is the case then I would also like to assume we all want to use a high air flow filter and or at least an exhaust can and to readjust the jets, needles, pilot screws ect ect to correct the fuel air after those mods have been done. But on the same token for anyone that wants to leave their bike stock all power to them.

    As far as getting it dyno tuned is concerned there is probably a little more thought that goes into it than "we will go up 1 size in jets until the hp does go up any further". There is clearly a science behind it that we should be able to discuss.

    I actually called up a place to get my bike tuned and the place was called something like "max performance super tune" with the site saying "we get the most out of your bike by dynoing and computers blah blah blah"
    So I called them and this was the EXACT conversation:

    Hi I want to get my bike tuned!

    What bike is it?

    A cbr250rr!

    Whats wrong with it?

    Well I put a uni filter in and I feel its running lean!

    Its fine mate....

    But it has less power than before?

    Its fine...

    But its not fine!!!

    Just put your old filter in its fine.

    ummmm okay *hangs up*

    Which is pretty much the reason I am trying to do it myself.
     
    Damus, Jul 14, 2015
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  17. Mclaren

    Mclaren Well-Known Member Contributing Member

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    No u don't go one size up for more hp
    Forget hp the purpose of a tune is to get correct fuel to air mix then u can get a perfect power curve hp isn't everything it a wank factor thrown around get smooth throttle response and u will notice that rather than 1-5hp
     
    Mclaren, Jul 14, 2015
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  18. Damus

    Damus She is a BEAST and riding it is comparable to sex Dirty Wheel Club

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    "No u don't go one size up for more hp" I was just being silly when I said that but yes I agree with everything you are saying.
     
    Damus, Jul 14, 2015
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  19. zixxer

    zixxer Well-Known Member

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    if it was max power motorcycles they wont work on your bike, they dont work on older bikes.
     
    zixxer, Jul 14, 2015
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  20. Damus

    Damus She is a BEAST and riding it is comparable to sex Dirty Wheel Club

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    A lot of places wont touch the mc22, I got knocked back by about 4 mechanics when I had the electrical problem.
     
    Damus, Jul 14, 2015
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