CT70 with YX140..very hot spark plug??

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CT70 with YX140..very hot spark plug??

This is a discussion on CT70 with YX140..very hot spark plug?? within the Z50, CT70 and JDM Monkeybikes forums, part of the General Talk category; Hi..CT70 with brand new YX140..first run...normal for the spark plug to be burning hot?...so hot cant even hold it in my hand once taken out....is ...

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Thread: CT70 with YX140..very hot spark plug??

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    FrankyArseneau's Avatar

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    CT70 with YX140..very hot spark plug??

    Hi..CT70 with brand new YX140..first run...normal for the spark plug to be burning hot?...so hot cant even hold it in my hand once taken out....is that normal???...does not seems like it.

    Any help?..just want to make sure i dont damage anything.

    Bike kinds of not running well either..sputters in 3rd gear..sometime even in second..

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    Maybe a needle clip adjustment?...from what i read could be running rich??..and why its hot?
    Only thing i have not played with is the needle clip?..should i move it up a notch?

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    What carb are you using?
    tmas

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    A "fake" 26mm mikuni believe.
    I just cheked the clip..it was almost at the bottom....the position before the last one (on the rich side)...i move it up 2 slots...to now its one up from the middle...but runs hot also..

    Maybe i should bring to to someone around that could "tune" it for me...or should i be able to do this myself??...opinions?

    Quote Originally Posted by tmas View Post
    What carb are you using?
    tmas

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    You should be able to do it yourself. Do you have a jetting kit? Check links.
    tmas

    https://tboltusa.com/store/tech.php?...ide+to+Jetting

    https://tboltusa.com/store/mikuni-vm...it-p-5437.html

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    I would say, YES, the plug gets too hot to handle...pretty much always.
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    An engine that is overly hot is usually a sign of running lean, moving the clip up closer to the top of the needle makes it even leaner, by lowering the needle and restricting the fuel flow more.
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    Do you have the carb that is pictured below? That has the fuel screw in front of the float bowl and under the intake manifold? If so, what jets do you have in it at the present time?

    Click image for larger version. 

Name:	Mikuni-clonecarb.jpg 
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    Ok good to know at least!

    Quote Originally Posted by kirrbby View Post
    I would say, YES, the plug gets too hot to handle...pretty much always.

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    Yes that is exactly where my fuel screw is! Unfortunatly i dont know what jet sizes are in..i will have to find out..

    Quote Originally Posted by dirtbkr188 View Post
    Do you have the carb that is pictured below? That has the fuel screw in front of the float bowl and under the intake manifold? If so, what jets do you have in it at the present time?

    Click image for larger version. 

Name:	Mikuni-clonecarb.jpg 
Views:	23 
Size:	30.1 KB 
ID:	209169

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    Oh...i fugured if it would run rich that is where it would get the engine hotter...but i guess having less fuel to cool down or something...from what i have read...

    Quote Originally Posted by dirtbkr188 View Post
    An engine that is overly hot is usually a sign of running lean, moving the clip up closer to the top of the needle makes it even leaner, by lowering the needle and restricting the fuel flow more.

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    It's been a while since I've had one of those carbs apart, but I seem to recall the stock jets to be #90 or #95 main jet and a #15 or #17.5 pilot jet.
    The baseline setting was along the lines of a #100 or #105 main and a #20, #22.5, or even up to a #25 pilot jet, setting the needle clip in the 3rd or 4th slot from the top, and setting the fuel screw at 1-1/2 to 1-3/4 turns OUT from seated. You should turn the fuel screw OUT to richen it a 1/4-turn at a time and IN to lean it out
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    I have read that since my engine is brand new...before it breaks in it can run a bit hotter than the usual?

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    The plug will always be too hot to handle if you pull it from an at temperature motor, regardless of being new or not. And yes, the engine will be hotter when new...after you ride it for a while it will settle in. That's one of the reasons you are supposed to break them in...not only to seat the rings properly, but not to overhead the thing.
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    Well i am happy to hear that!..about the plug being hot.etc..after all...i think all is needed is a little tuning!
    Because i have continue to read last night...and from what i see my main jet is dialed in right ..because from half throttle to full..it pulls going and runs fine...and i guess my pilot jet/needle clips need adjustment because its were im seing the bike not running very well.

    Thanks for the help guys!

    Quote Originally Posted by fatcaaat View Post
    The plug will always be too hot to handle if you pull it from an at temperature motor, regardless of being new or not. And yes, the engine will be hotter when new...after you ride it for a while it will settle in. That's one of the reasons you are supposed to break them in...not only to seat the rings properly, but not to overhead the thing.

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