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Thank you guys this is such a better option then the epoxy. I actually have a bunch of thread taps, I just need to find the right size and a new stud/nut. What is the 10mm studs for 150cc heads? I used the stock studs and its a 139qmb engine so I assume those are 6mm? And all that means I should get the 8mm studs then i'm guessing and i'll have to call around see whos got these parts but thanks again alleyoop your like an encyclopedia of scooter knowledge. 

Yes it is the headlights and the running brake light on my scooter had stopped working one night on my way home since whoever I got it from did not know how to wire anything. Anyway my fiance had taken the scooter the next day and on her way home from work she was in an accident because she was not seen so always make sure you are nice and bright out there people don't pay attention. She was fine a few scratches and bruises but front end on the scooter is pretty much gone, so theres that story always make sure you can be seen

If your lights are dim it is definitely because your battery is dead or there is a short somewhere and you are losing alot of power some where else like a ground being disconnected. I have had several lights on my scooters go dim but from my experiences it has always been the battery every time, every time I get a new battery lights work perfectly. But I am sorry to hear your upgrades haven't been going so well. I bought a kit with pretty much the same parts and everything went together nice and smooth even used the 8 gram rollers and they work great for me but im a smaller guy at 150lbs but when me and my fiance ride hills just kill us and can't reach more then 4k rpm so thw 8g roller is a little heavier and iove been doing some reading so im thinking about ordering 8 gram sliders and I think that will be the perfect tuning for me I am pretty positive I need around a 7 gram roller weight 8 is great for myself just not when riding doubles, and even by myself if the incline is really steep I will have a little power issue.

Thanks for the quick reply alleyoop,

But I installed the 8 gram weights because it came with the kit I bought, so I figured that would be the recommended weight for the 50mm piston kit I installed. I have a very accurate scale and I have extra 4.8 and 5.8 gram rollers which I assume are 5 and 6 gram rollers. the 5 grams are stock and the 6 gram weights are from a wrecked 47mm big bore 139qmb. So I will try the 6 gram rollers since you advise this alleyoop, I will let you know how it works out. Although the 8 gram rollers are great for everything else its just hills with me and my fiance which is about 280 lbs combined weight. But alleyoop I have decided to buy a ncy performance transmission kit in about 3 weeks or so, so what spring rates for the small and big springs would you suggest I get? Considering my set up which is performance parts from the 50mm piston all the way up to the carb and air filter. So me and fiance can get some power uphills we encounter them often on the way to our work places. I like you alleyoop your very helpful thank you man!

OK so I just I can't do any more upgrades to the engine except a stroker upgrade which hopefully will be one day in the future so besides buying a crank. Now the scooter is completely great by myself but with my fiance when we go uphills our stock transmission can not take it, together we weigh about 280 lbs. and uphill we lose all power will only go to 4 rpms and about 20-25 mph depending on how much of an incline it is. Besides hills everything is great keep up with traffic with me and her even while I am taking it easy in the break in process. Now I am going to buy all new performance transmission parts (gears, variator, sliders, clutch assembly, etc.) but I have a budget and am wondering what would be the best thing to buy first for under a $100 and get the best deal to solve my problem I am hoping someone can help me out on here. The kit I bought came with 8 gram rollers and I will get sliders pretty soon but I don't think that will solve my problem.

I would love to get this but its just so expensive, not even that just too much at once.

I am having trouble finding much information on that engine but if its a gy6 most of the bolt ons should fit exhaust i have no idea but you can definitely get some sliders just figure out what weights you have already and a upgraded coil/ spark plug shouldn't be a problem to get your hands on, and you have to figure out if your stator is AC or DC fired this is very important when when picking out a CDI. Most chinese brands are AC fired stators but alot of other brands like to choose DC fired. now you should be able to get a carb to put on but again you must figure out what size carb and main jet you already have to know which is an upgrade. If you add an air/ filter or exhaust you are most likely going to have to increase the main jet one size.m I wish I could help you more but thats just a pretty rare engine but it is a gy6 so i assume most bolts ons will fit. But you know what happens when you assume

idk about that engine but I was able to find a "premium power pack" for a 139qmb engine on ebay for $175 consisted off performance head, big bore kit, carburetor, main jet, oil pump, cdi, exhaust and I think thats everything might be forgetting somerthing but I am sure you can find something like that for your engine on ebay the parts I got were also of quality and feels more solid than it did when it was brand new just sharing my experience you have a way different engine your results may be different.