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Post by wutzthedeal on Mar 6, 2013 20:01:27 GMT -5
My replacement carb has an  main, 32 pilot; I don't know what my factory sized jets are, but I know that at least the main jet is larger and I think both are larger. If I didn't install a bbk, will these provide any benefit? I have increased airflow at intake and exhaust so in the normal formula, jet size would seem to be the last limiting factor outside of more expensive upgrades. |
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Post by millsc on Mar 6, 2013 20:03:54 GMT -5
try it out and check the plug, if the plug looks good and it runs good leave it be. I usually put an 80 main and 32-35 pilot jets in stock 50cc scooters.
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Post by wutzthedeal on Mar 7, 2013 0:59:28 GMT -5
Would there be any drawback if is too big? |
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Post by JR on Mar 7, 2013 1:03:05 GMT -5
If you have opened up the intake and exhaust you might just need the larger jets.
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Post by teddy554 on Mar 7, 2013 7:39:56 GMT -5
Well if its to rich it will have more carbon build up and use plug more plus you will not have full power. the 4t are a little more forgive of being rich or lean but imo main is way to big for a stock 50cc scooter. Most 72cc scooter can run fine with a -  jet with the stock box. Are you using a stock air box or open filter this will be a factor in jet size also |
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Post by prodigit on Mar 7, 2013 13:15:45 GMT -5
Reason the more to put your performance exhaust, and possibly a BBK!  If you're running a bit rich, you can still ride your scooter. Same as when you're running lean. It'll just not be optimal performance. BTW, can't a big jet be compensated by adjusting the carburetor (AF adjustment)? |
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Post by teddy554 on Mar 7, 2013 14:45:25 GMT -5
No the a/f screw really has nothing to do with the size of the main jet or the tune of the main jet, you can compensated by allowing more air in by a less restrictive air box or open air filter, there is four ways to adjust fuel on a carb, main jet, secondary or pilot jet, needle adjustment and air/fuel screw each one has a certain range in the throttle that it is primarily responsible for
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Post by xxwoodmanxx on Mar 7, 2013 14:49:37 GMT -5
Yes, but IIRC, stock A/F is only 1.5 turns out? Might have to drop your main jet size , depending on your intake/exhaust. Based on your details in your sig, I would probably go back to stock jetting until you upgrade exhaust, pod filter, etc, etc
I upgraded exhaust, pod filter, and dremeled my intake and my carb venturi, and I had to turn my A/F about 4 turns out until I finally had to upgrade my main jet. Now with a 125 main jet on my 150cc, I am about 1.75 - 2 turns out.
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Post by wutzthedeal on Mar 7, 2013 16:09:13 GMT -5
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Post by millsc on Mar 7, 2013 16:32:03 GMT -5
running slightly rich won't hurt anything, it wouldn't be overly rich with the |
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Post by xxwoodmanxx on Mar 7, 2013 17:53:16 GMT -5
True, and in this colder, denser air, it should be easy to dial in on the A/F screw.
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Post by wutzthedeal on Mar 7, 2013 18:12:36 GMT -5
I'm somewhat amazed at the performance gains that just getting up to 48 degrees brought (haven't received this carb yet). Smooth and fast, wicked acceleration bout to throw me off the back of the bike. Summer will be good, and I suspect even better with the carb.
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Post by imnts2 on Mar 7, 2013 19:14:39 GMT -5
Not only will running rich not hurt anything, it really helps it both develope max power and run a little cooler. It shure help an air cooled engine a lot. You don't need $10.plugs, but I supose a spare plug would always be a good idea.
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Post by teddy554 on Mar 7, 2013 20:37:51 GMT -5
some issues and symptoms of running rich from different sources and most motor will make more power lean the rich from my experience, but a isnt that far off like i said earlier 4t are more forgiving when it comes to jetting and tuning the carb then 2t i think a jet in the 75-80 range would be better suited for a stock 50cc but trial and error would be the best way to find out so buy a couple jet and find the best one for you and your scooter Typical symptoms of running rich include plug fouling, four stroking, extra-smoky exhaust, as well as increased carbon buildup throughout the engine and exhaust pipe. 1) Rich Mixture means the carburetor is delivering too much gasoline. Typical symptoms of a rich mixture are: Poor fuel economy Sluggish acceleration Choke not needed from cold starts Sooty or black spark plugs Sooty or black muffler end pipes Strong smell of gasoline when machine is at idle Uneven running (will often slow from regular idle rpm's and stop) |
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Post by wutzthedeal on Mar 7, 2013 21:50:18 GMT -5
Thanks teddy I'll keep an eye out for that stuff. The surface stuff indicates I'm not running rich bit I'll re-check the plug before and after swapping the carb.
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main, 32 pilot; I don't know what my factory sized jets are, but I know that at least the main jet is larger and I think both are larger. If I didn't install a bbk, will these provide any benefit? I have increased airflow at intake and exhaust so in the normal formula, jet size would seem to be the last limiting factor outside of more expensive upgrades.
jet with the stock box. Are you using a stock air box or open filter this will be a factor in jet size also 
