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Post by steve on Oct 10, 2015 11:56:22 GMT -5
So, I have a Jonway Valero 50cc. I had been running it with the 50mm BBK, because It is my sole transportation, and there are some BIG hills along the routes I take. The biggest hill would take my stock 50cc down to about 20-22 mph, to give you some perspective. With the 50cc BBK, it would hold 35 mph all the way up the hill, which is not bad. Anyways, I decided to really do it up. I bought the Hoca 52mm cylinder and piston. I bought a new crankshaft from Scrappy's, not a stroker, but the regular one. The bearings on their cranks are great, and can easily handle the extra power from BBK's. I bought a nice big valve head from Scooters-to-go. They sell high quality stuff for a good price. I also bought an A9 cam from them. This was a complete engine rebuild, and took me a little while. But, all I can say is "wow"! The performance I am now getting is mind boggling. I am using a 20mm carb, with  main jet, and 40 idle jet. This thing hauls butt. It will hold 48 mph up that monster hill, and acceleration is insane. I am very pleased. Great way to make a 50cc scoot into a monster. I am going to change the gears, and I am certain I will be able to get over 60mph. |
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Post by gy6er on Oct 10, 2015 13:00:47 GMT -5
Ever ran a 50mm kit w/ 24mm (150cc) carb. I am curious why you would step up cc's and not try a 24mm carb. Sounds cool,but I'm willing to bet it will be stubborn to start in the cold... w/ out kicking. Good luck, I like 50 BBK bikes. Update lrt and let us know if you mean gps on those speeds.
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Post by tvnacman on Oct 10, 2015 13:10:30 GMT -5
Steve, how is start up. Smooth, laboring or kick backs? What cdi are you using?
John
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Post by steve on Oct 11, 2015 8:33:43 GMT -5
It starts right up, but there is a kick back issue. I am using one of those blue CDI's, with the pigtail on it, and the little LED light on them. A regular starter was just barely able to turn it over fast enough when I had the 50mm on. A regular starter will not even turn it over with the 52mm bore. I bought one of those high-torque starters from Scrappy's. They cost $  , but they are well worth it. I am going to buy 2 more for spares. John, you ought to look in to stocking those starters. They are made by Taida. They are way, way more powerful than stock starters, and turn this thing over quicker than this thing turned over when it had the stock starter and 39mm bore. |
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Post by steve on Oct 11, 2015 8:37:32 GMT -5
I checked speed up that monster hill with GPS. My speedo is off more than I thought. It is going 43-44 mph at the top of that hill, which is still mind boggling.
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Post by steve on Oct 11, 2015 9:16:18 GMT -5
Ever ran a 50mm kit w/ 24mm (150cc) carb. I am curious why you would step up cc's and not try a 24mm carb. Sounds cool,but I'm willing to bet it will be stubborn to start in the cold... w/ out kicking. Good luck, I like 50 BBK bikes. Update lrt and let us know if you mean gps on those speeds. I am going to upgrade the carb in a couple of weeks, when I get some more cash flow. One step at a time. Right now, I am running the 20mm carb. I have a 40 idle jet, and a main. It starts right up. I just have to touch the starter. I do have one of those high torque starters from Scrappydog's. |
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Post by gy6er on Oct 11, 2015 15:30:25 GMT -5
Nothing like a giant bbk. I got tons of miles out of a ncy 50 mm kit w/ 24mm carb. I was on a taotao and so reliable, I never learned how to wrench at all for years. BTW... Hoca head would sing like a song bird!! I would break a bbk in though. Who knows how much it may matter.
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Post by steve on Oct 11, 2015 15:51:19 GMT -5
Thanks.
I am going to upgrade the carb with a 24mm first. Then, I am going to get a really nice head. I broke the BBK in pretty well. I let it idle at different RPM for about 15 min, then take it up and down hills for a little while. I'm going to change the oil tomorrow.
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Post by florida on Oct 12, 2015 3:44:35 GMT -5
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Post by gy6er on Oct 12, 2015 7:55:21 GMT -5
If you go with a 24mm carb you will at least need a 105 main jet with perf filter and pipe. I don't know your set up but I had 50mm (85cc) ncy piston and hoca head with pipe and high flow air filter and tuned all year round right on the $$$ with a 105 main jet. 52mm piston is big, but just to give you an idea.
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Post by steve on Oct 18, 2015 9:13:43 GMT -5
As an update, this thing just sheared the variator rails.
I got a "performance" variator on the cheap, and put 8g weights in it. Sheared the rails that the face slides on. I thought that the new crankshaft's bearings had went when it first happened.
Any recommendations on a variator that can handle this thing, without having to spend $150 on a Dr. Pulley?
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Post by gy6er on Oct 18, 2015 12:09:08 GMT -5
Any should,just make sure your v slides are Dr pulley. If they get old,or seem frail,replace at once. That is the only reason your variator tore. Parts for scooters or scrappy stock replacement one should be fine. Way fair price at them also.
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Post by steve on Oct 19, 2015 18:31:55 GMT -5
Steve, how is start up. Smooth, laboring or kick backs? What cdi are you using? John John, to clarify, it will kick the starter clutch back out a couple of times, usually, when starting. That high torque starter is a must. I am running the blue CDI, with the pigtail on it, and LED light on it. If I change to stock CDI, it doesn't really have a kick back issue any longer, and will start on first push. It starts within 1 second, every time, though. Doesn't have to turn any length of time, as long as it doesn't kick the starter clutch back out. |
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Post by JerryScript on Oct 20, 2015 3:02:00 GMT -5
You should purchase one of John's ( tvnacman) advancing angle CDIs. Notice i wrote advancING, not advacED. The always advanced CDIs cause kickback at low RPMs, the advancing CDI doesn't change the angle till higher RPMs are reached. Definitely one of the best purchases I made for my BBKd Q50! |
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Post by lain on Oct 27, 2015 20:46:21 GMT -5
Ever ran a 50mm kit w/ 24mm (150cc) carb. I am curious why you would step up cc's and not try a 24mm carb. Sounds cool,but I'm willing to bet it will be stubborn to start in the cold... w/ out kicking. Good luck, I like 50 BBK bikes. Update lrt and let us know if you mean gps on those speeds. This may be relevant; I just installed a 150cc (24mm) carb (with #105 jet)and intake and spacer on my 50mm bbk scooter with big valves and holy shiz! Going uphill at 50 with a passenger! The speeds are incredible. I am using 8g weights, stock gears, 10 inch wheels, stock crank, 50mm bore, big valve racing head, stock exhaust. I never thought this power could be attained on a scooter that used to be a 50cc, it feels like there is torque through the entire range of movement, even engine stopping is faster! It sort of feels like a 125cc scooter, it's just insane. I actually was just playing around and figured it would be a laugh to install it and see how it would bog out, but it didn't! It never ran better! I urge you to try it steve |
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main jet, and 40 idle jet. This thing hauls butt. It will hold 48 mph up that monster hill, and acceleration is insane.
, but they are well worth it. I am going to buy 2 more for spares. John, you ought to look in to stocking those starters. They are made by Taida. They are way, way more powerful than stock starters, and turn this thing over quicker than this thing turned over when it had the stock starter and 39mm bore.
