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Post by chamisataza on Jul 30, 2014 17:27:54 GMT -5
i ported my sym dd50 boost intake block ..what will be my changes in my main jet and pilot jet to prevent soft seized?right now my carb is 21mm oko w/uni air filter.. w/42pilotjet and 103main jet..thanks
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Post by alleyoop on Jul 30, 2014 19:07:01 GMT -5
This is not a science that you can say put this in if you got this, it is all trial and error. Also just porting the intake all that does is allow the air and fuel to flow smoothly. Also is that a 100cc BBK in there the pilot and main are awe fully big, even a 250cc motor does not have that big of a pilot jet even a 150cc motor either. I don't think you have to worry about seizing the motor I think you have to worry about flooding the poor thing.
People think DUMP A GALLON of gas and WOW the power in reality you just are making the motor loose power with to much gas, it cannot burn it all and it dumps it out the exhaust.
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Post by chamisataza on Jul 30, 2014 20:52:41 GMT -5
72cc bbk
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Post by alleyoop on Jul 30, 2014 21:36:15 GMT -5
72cc your way overjetted BRO, that thing must be a dog with to much fuel
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Post by chamisataza on Jul 30, 2014 22:10:39 GMT -5
i port the boost intake block not the intake port sorry my mistake..
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Post by alleyoop on Jul 30, 2014 22:17:04 GMT -5
What is the boost intake block? Don't care what you dremeled those jets are to big for a 72cc. And also remember they call it a 72cc but it really is not 72cc it is less.
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Post by chamisataza on Jul 30, 2014 22:52:37 GMT -5
i know i they just call it 72cc..the engine block intake where you connect the intake manifold..
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Post by gregw on Aug 23, 2014 17:02:32 GMT -5
making the intake block larger (inside diameter larger) won't do much, if anything, to the way it runs. Re-jetting won't be needed, unless other mods happened at the same time as the porting.
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Post by chamisataza on Aug 29, 2014 15:01:11 GMT -5
i put #105 main jet on my 21 oko and uni pod filter the black one,v8 pipe and it runs smoothly and fast but when i try to put 110 main jet it runs ok but 105 main jet run smooth and faster i thought it will run fast on the 110mj. plug is tannish/pinkish...i just run it about 6 miles most wot for testing.before it soft seize w/ 103 main jet and w/ uni air pod filter covered w/ plastic cup w/2 holes on the side
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Post by chamisataza on Aug 30, 2014 21:34:01 GMT -5
i try to run my scooter this time it soft seized again even i put #110 i don't know if it soft seized or not the engine is like coughing then when i give or feed with gas and then stop then i check the plug color is ok tannish so its burning ok,i kick start again w/ manual chock and start again.i don't know whats the problem on my scoot.now i put the 100mjet and change my cdi to stock it runs ok but i don't know yet if will soft seized again when i drove it again long miles.
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Post by rpdemers on Aug 31, 2014 18:36:30 GMT -5
it almost sounds like you are giving it way to much fuel. i would drop the jet down a few notches. and check the seals where your intake meets the motor, it could have a hair line crack, or even a small split.
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Post by chamisataza on Aug 31, 2014 21:11:30 GMT -5
that's what i am thinking rpdemers that's why i put back the 100mjet from 105 even 110 what seal are you talking about is that the gasket on the manifold..i will make my long test run again i tested it already w/ a 100mjet just 2 miles it runs smooth and fast..i don't know yet if i ride long miles problem will show up again hope not...
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Post by rpdemers on Sept 1, 2014 9:05:21 GMT -5
Well the crack I'm referring to is not the gasket. I mean the actual intake Sometimes because of the quality of the aluminum\metal they can crack when porting if it is a lower quality metal l. Depends on whether your bike is a cheap Chinese model or not. But yea, run some
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Post by rpdemers on Sept 1, 2014 9:05:54 GMT -5
Plug chops and then you will see l. You want a light coffee color on a 2 stroke
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Post by chamisataza on Sept 1, 2014 19:30:39 GMT -5
since i port it before to make it bigger..i decided to put j-b weld to make the intake narrow again i thought its getting too much air. i just noticed before i j-b wield there is a thin small line at the floor of the intake maybe 1/4 inch.maybe that's the hair line crack your talking..but it was covered with jb-weld...so what will i do if theres a crack?i just tested the scooter about 5 miles with a lot of wot (  degree F ) plug chop light coffee color..my scooter is made in Taiwan clone of Honda dio |
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..BAD TO THE BONE..
degree F ) plug chop light coffee color..my scooter is made in Taiwan clone of Honda dio