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Post by ramblinman on Dec 10, 2013 6:46:03 GMT -5
seems like most are using a  jet on 100cc bbk's. i have a jet on order, the largest i currently have is an  main. i want to install my new 50mm bbk today but don't want to ruin it by running lean. i'm not going to change airbox or exhaust (will do when my new jet arrives) so will an jet be fine for now? |
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Sophomore Rider
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Post by buford1488 on Dec 10, 2013 7:18:40 GMT -5
stock head? is a good starting point... |
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Post by ramblinman on Dec 10, 2013 7:50:25 GMT -5
stock head? is a good starting point... yes stock head. i don't expect my new jet to arrive until later this week. maybe i will just wait to be on the safe side. i don't want to find out i am running lean after install with no way of curing the problem. meh... |
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Post by jjoshua20213 on Dec 10, 2013 9:22:12 GMT -5
I started all my bbk's with 's and they ran barely lean but not enough to overheat, or damage anything. You'll just loose a little top end speed. I have an  main in mine now with a free filter.  - seemed too rich for my bike and made it accel slower. Buy an a9 camshaft too. Your only going to gain low end torque without it. Top speed might even drop without it. The variator weights should be about 6-7 grams. When you do a bbk, you have to do EVERYTHING or else its pointless. |
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Post by ramblinman on Dec 10, 2013 13:54:38 GMT -5
I started all my bbk's with 's and they ran barely lean but not enough to overheat, or damage anything. You'll just loose a little top end speed. I have an main in mine now with a free filter. - seemed too rich for my bike and made it accel slower. Buy an a9 camshaft too. Your only going to gain low end torque without it. Top speed might even drop without it. The variator weights should be about 6-7 grams. When you do a bbk, you have to do EVERYTHING or else its pointless. i'm sure i will be tinkering with this scoot for many days/weeks after install. i did buy an A9 cam i will be installing with the bbk. also have free flow exhaust that has been sitting in storage for months but not going to put that on until i get new jet. hoping i can use the stock airbox with a little modification. plan to change gears in the near future also. well, i wasted most of my day doing other stuff so not installing today. friday i will have time to do it, hopefully the new jet is here but if not i will go ahead and slap it on since you didn't have much problem with an 85jet. |
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Post by JerryScript on Dec 10, 2013 19:06:26 GMT -5
If you do use an main with your BBK install, be sure to lower your needle clip, probably all the way down or a notch above that. Otherwise you will most likely bog on acceleration. With the stock airbox's restrictions, you may be ok with that setup for a while, some people have reported so. But do a plug chop, and you'll probably find it to be white, indicating lean. I rode for two weeks this way, simply because I wanted to do a series of plug chops before up-jetting and it was always bright white. Now that I'm running a , I have a nice light coffee color, as it should be. |
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jet on 100cc bbk's. i have a 
main. i want to install my new 50mm bbk today but don't want to ruin it by running lean. i'm not going to change airbox or exhaust (will do when my new jet arrives) so will an 
main in mine now with a free filter. 
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