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Post by trancebear on Oct 5, 2011 0:56:45 GMT -6
Currently I have the stock 24mm carb on my GY6 150cc engine and I installed a UNI air filter on it yesterday and I have lost some throttle response. I have read that you need to replace the jets when you install a performance air filter. I won't have my new Mikuni carb for a couple weeks. What size jets would you guys recommend for this situation? I have read so many different recommendations from 110-125. Thanks for any help.
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Post by Bashan on Oct 5, 2011 1:49:35 GMT -6
Many times folks add a lower restriction air filter anticipating a good kick in the performance pants only to find that the scooter bogs or falls flat. Yep, you gotta rejet, I'm not sure what air situation you have going on but probable start around a 110 and work up incrementally. It can be a slow and frustrating process. Let us know how the 32 mm mega carb upgrade works out, you better stock up on some prozac.  Rich
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Post by royldoc on Oct 5, 2011 8:44:30 GMT -6
Scooter engines have individual personalities. So what works for one won't necessarily work on another. It is a trial and error system. Find out what size jet is in it now and go up 2 sizes. That is a good starting point. 110- 125 is a pretty good spread, It may take a few tries to get it right.
Roy
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Post by trancebear on Oct 5, 2011 11:50:44 GMT -6
Scooter engines have individual personalities. So what works for one won't necessarily work on another. It is a trial and error system. Find out what size jet is in it now and go up 2 sizes. That is a good starting point. 110- 125 is a pretty good spread, It may take a few tries to get it right. Roy How can I find out what the original size is without pulling the carb out? I cannot be without my little scooter..lol |
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Post by Alleyoop on Oct 5, 2011 11:56:05 GMT -6
There is no way to find out, you will have to pull the carb off or just loosen the clamps and turn it sideways or updside down to get the Bowl off. AND THEN you may still NOT KNOW baecause most of the JETS on the Chino scoots ARE NOT MARKED. Then to find out you will need Small Size Drill bits to see which one fits the hole in the jet being carefull not to scratch the inside of the jet.
Sorry but you will have to get your hands smelling of gas ;D
Alleyoop
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Post by trancebear on Oct 5, 2011 14:22:32 GMT -6
Dagnamit
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Post by ce on Oct 5, 2011 15:24:09 GMT -6
In the meantime you can wrap the air filter with medical gauze to slow down the air flow and try to balance the ratio.
The when you get your 50 mm carb you can open up that dinky 24 mm and see what's in it. It's prolly a 102 0r 103 since it's starving now, a 105 would run fine, a 108 better, and maybe a 100 at the rich end.
It's no big deal, loosen those clamps after you drain the fuel bowl, use a right angle hhilips head to break loose the screws, open it up, switch the jet, put it back on.
Like Bashan sez, you'll only be doing it about a Brazilian times...
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Post by sprocket on Oct 6, 2011 10:10:33 GMT -6
trancebear You have oiled that UNI right? They are useless without oil.... and will make the engine run extremely lean. With oil it should be better... A 50mm carb will be terrible on a stock 150GY6... your performance will take a HUGE nose dive...even with a 30mm the vacuum needed for the carb to operate is minimal...
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Rich
..BAD TO THE BONE..
