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BBK brands
by: onewheeldrive - May 29, 2018 1:49:56 GMT -5
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Post by onewheeldrive on May 29, 2018 1:49:56 GMT -5
I don’t think it’s realistic to hit 55mph with the 49/17 gears, but maybe close to 50. If you have a headwind forget about it. I honestly think if it’s a really strong headwind you may actually be slightly faster with stock gearing, or close to a tie, unless you can power through it.
Is top speed the most important thing to you right now? Is it worth sacrificing acceleration for top speed at this point? That’s up to you to figure out what’s best for your riding situation. Let’s say you could hit 55mph, how long will you actually maintain that speed and how long will it take to you get to that speed?
If you ride on straightaways a lot then maybe increased max speed will pay off in the long run. If you don’t, then Little Johnny’s scoot down the road that can do only 45mph (but is quicker) will probably beat you from point A to point B.
I haven’t messed with any other gears but the 49/17. There’s no way I’d go with taller gears with the 72cc I had, cuz there was no way I’d probably ever hit that top speed on my daily route for it to be worth it.
Just decide what’s best for you or what your goal is.
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Post by onewheeldrive on May 23, 2018 7:43:20 GMT -5
Recently I swapped my stock Air Box for a regular cone-like air filter as the air box was getting a couple of cracks in it. I had to block off the hose coming off the CVT (it's a breather) and the other hose coming from the front of the head (fuel blow by that gets recycled back into the air box) as without the air box there was no where to attached them. You shouldn’t block off the hose coming from the valve cover. |
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Post by onewheeldrive on May 15, 2018 19:52:20 GMT -5
Yeah something is seriously not right here. I have a 72cc with no mods pretty much and I could beat you (at least in the long run, maybe not off the line) and I have nothing to brag about except a 72cc with pretty much stock everything else, lol.
Did you put all your mods on pretty much all at once, or gradually and still no change? With the 49/17 gears you should go over 35mph easily, especially since your engine has the balls to pull those gears. I’m not trying to be funny here, but unless you weigh 400lbs, you should be able to top 35mph. Is that GPS verified?
What performance head is in that package, do you have an actual link to the package you’ve bought? Honestly, this is the first I’ve read about different rockers used on these smaller Chinese engines.
Your’re running a 100 main jet, right?
I’m really curious as to what all restrictions were in place on this scooter. Do you mind telling us what all they were? Also, what performance CDI?
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BBK brands
by: onewheeldrive - Apr 21, 2018 1:24:42 GMT -5
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Post by onewheeldrive on Apr 21, 2018 1:24:42 GMT -5
Yes I set them at .004 I think its the wireing on my cdi when I move them around enough it fires up. I'm replacing the cdi and the connections. I have to take it apart again anyway to put the new big valve head and gasket in and I always check my valve gap before the valve cover goes back on. I had it running last night but the connections aren't good. So after that I think the problem should be solved. Hopefully that solves it. It’ll feel good to get that thing going after all this. I will say that it’s nice to see some determination here from a member wanting to get things done without giving up. Reminds me of myself, although there were a few times where I could’ve ghost ridden this scoot off a cliff, lol. |
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BBK brands
by: onewheeldrive - Apr 20, 2018 3:10:18 GMT -5
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Post by onewheeldrive on Apr 20, 2018 3:10:18 GMT -5
I think you were right about the air leak there was no exhaust gasket in the head. It's all back together but I can't run it till I get a starter. There is no reason it shouldn't start now I'm praying. Thankyou for the good call on that. Time will tell when I get my starter. I just hope I don't miss any good riding days. I'm up for a nice long relaxing ride. God Bless!! I think it should still start even without the little exhaust gasket. I think something else is going on somewhere. When you put the old head back on did you check the valve settings again before attempting to fire it up? I remember you said you tried the old one after the other head had a bent valve. |
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BBK brands
by: onewheeldrive - Apr 19, 2018 19:03:03 GMT -5
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Post by onewheeldrive on Apr 19, 2018 19:03:03 GMT -5
It might not be a bad idea to take a look at your kickstart assembly and see what’s going on with that.
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BBK brands
by: onewheeldrive - Apr 16, 2018 18:13:39 GMT -5
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Post by onewheeldrive on Apr 16, 2018 18:13:39 GMT -5
What a FN idiot that guy was. I bet it was the gy6 store right? I can't get my scoot since that stud broke. The timing is on and I get a backfire and no ignition. Do you know what could be wrong I took this apart and timed it with the proper tourque about 5 times and still won't start!!!  ? Maybe it’s a bit lean and/or there is big leak where the exhaust bolts to the head. Do you have an exhaust gasket, or feeling a lot of air coming out there? Sometimes the little ring gasket will fall out when you take the exhaust off. What jet do you have in there, the  or the  ? |
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Post by onewheeldrive on Apr 11, 2018 10:28:47 GMT -5
I (or we) would be able to tell if it’s one of the crank bearings going out just by the sound. I’ve heard it about 6 times over the last 10 years.
I can’t say I’d describe it as a popping/clicking sound. I’d say it sounds more like a diesel engine, like a school bus.
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BBK brands
by: onewheeldrive - Apr 7, 2018 4:44:00 GMT -5
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Post by onewheeldrive on Apr 7, 2018 4:44:00 GMT -5
Keep in mind everytime you mod your scoot you may prefer a different weight roller.
From a stock scoot to a bigger bore, tranny gear change, changing the torque/contra spring... etc. Any of those mods or a combo of them and it’s likely going to be time to tweak the weights to your preference.
It might take a couple tries but you’ll learn what you and your scoot like, so it’ll be worth it in the long run. Maybe you don’t like the weights because you aren’t getting enough rpms so you decide to drop down in grams. Maybe you’ll like the stock torque/contra spring in the clutch better than the new one, same with the clutch springs.
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BBK brands
by: onewheeldrive - Apr 4, 2018 16:22:31 GMT -5
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Post by onewheeldrive on Apr 4, 2018 16:22:31 GMT -5
I’d maybe get 6.5g or 7g to start off. Maybe put the gears in first and then see.
Keep in mind you weigh about 65 more pounds than me.
With a stock 50cc I ran 6.5g
With a 63cc I ran 7g
With the 72cc I ran 7.5g mostly
With the 72cc and the 49/17 gears I dropped back down to either 6.5g or 7g. No other mods, only bbk and upjet w/stock airbox on all my engines. I did take the snorkel off the airboxes.
I’ve never ran the 50mm piston in my engines. Keep in mind you have more power than mine but you weigh 65lbs more.
A lot of people your weight go about 5.5g for a stock 50, which is about a gram less than me stock.
I’d try the 6.5 after the gear change. Just pick a weight and roll with it, thankfully rollers aren’t too expensive.
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Post by onewheeldrive on Apr 2, 2018 21:28:37 GMT -5
I meant to ask you about the final gear set. Does the gear with the shaft get pressed into the flat gear in the set? I was confused when I saw the video. I need every little detail. I have a bit of a learning disability. I hope I'm explaining correctly. The two gears in the new kit are not made to be pressed together. The larger of the two just gets swapped out (easy). For the other smaller gear, you need to press off the smaller old similar looking one that is already in your gearbox and press the new one that came with the kit on that same gear. Those two new gears will then mesh together once installed. Just make sure you take note of the placement of the nylon washer that will come out when you take the old gears out. If you forget just read here: 49ccscoot.proboards.com/thread/404/139qmb-gear-swap |
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BBK brands
by: onewheeldrive - Mar 25, 2018 21:34:23 GMT -5
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Post by onewheeldrive on Mar 25, 2018 21:34:23 GMT -5
Do you think 7g or 9g rollers would work on my scoot for the variator? Yeah. Each gram you go, whether up or down, probably changes the rpms by maybe 500 or so +/-. I like to keep mine between 7k and 7.5k at top speed or pretty close too max speed. 9g will probably be too heavy, unless you weigh 100lbs. I’d start with 7 or 7.5g and work from there. It’s trial and error to get it just right. If I could tell you one weight would be perfect the first try I would. If you knew the weight of the rollers in there already, you could work from there. Did you change the jet when you put your backfiring perf exhaust on? |
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BBK brands
by: onewheeldrive - Mar 25, 2018 16:06:21 GMT -5
Post by onewheeldrive on Mar 25, 2018 16:06:21 GMT -5
With the 49/17 gears you’d probably get close to 50mph.
The stock rollers are probably in the 8.5g range unless someone changed them. Pretty much every engine and new complete variator set that I’ve bought came with rollers in that range. If they were 13g you would be lucky to make it up a hill on a stock 50.
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BBK brands
by: onewheeldrive - Mar 22, 2018 22:23:58 GMT -5
Post by onewheeldrive on Mar 22, 2018 22:23:58 GMT -5
I was going to go with 7 or 8g rollers. What about the springs in the variator? All the kits come with blue springs! Can you explain that to me? Thanks for your response I guess I had the right idea with 7 or 8g rollers. But I need detailed information. I have to have the whole skinny on things so I fully understand how these thins work together! I just want to know exactly what I'm doing. I hate doing things 2 or three times to get it straight. The different colored springs have a different stiffness. Here is a quick basic write-up: itistheride.boards.net/thread/16/contra-clutch-springsIt seems you have a good starting point for weight in the rollers. If you consider yourself a bigger or heavier guy (not extremely), then you may wanna lean more towards 7g-7.5g, rather than 8g for starters. I’d just get a couple different weight sets in that range and see what you like best. The ones you don’t use can come in handy as a backup if needed, in case your variator gets trashed or maybe the belt breaks and the rollers don’t survive. Any idea what your rollers weighed in your stock 50, or that are in the variator now? |
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BBK brands
by: onewheeldrive - Mar 22, 2018 11:03:52 GMT -5
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Post by onewheeldrive on Mar 22, 2018 11:03:52 GMT -5
There isn’t going to be a magic number for roller weights, so it may take a couple tries to get it to where you want it. Your body weight, engine mods, and riding environment are major factors.
My guess is somewhere between 6.5g and 7.5g to keep the rpms down at top speed so you aren’t redlining with your newly added power.
In my experiences, the bigger the bore the heavier the weights (over a stock 50cc). I used to run 6.5g on my stock 50cc, but with the 72cc I ran 7.5g or 8g.
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or the 
?