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Post by stormcat06 on Jun 10, 2018 19:39:15 GMT -5
Hey guys,
Short history. I drove a 50cc scooter daily for 3 years. Put 18.8K miles on it. Retired it due to not the engine but the body and everything else. Walked in the same store I bought the 50cc and came home with a 150. Now that im in a better place I purchased a 150cc engine and it just arrived. My plan is to keep it as an extra or use it as an upgrade.
My understanding with a 150 is the biggest bore you can put on it is a 170cc (roughly). Would doing this really improve much? I also plane to replace all the stock parts with better quality parts. Think belts,CVT,hoses, ect. I dont want to go as far as cracking to far into the case... It requires a lot of expertise and specialty tools. however, I would like to take this engine and turn it into something "fun" for my scooter.
Im looking basically for a recipe that is sound. Ive seen a lot of BS information being spread out on the internets and im looking to source only proven, honest information. 90vt from youtube had been my go-to for truth for all this time. However, I didnt see anything with him working on a 150 and a solid upgrade path.
Thanks!
Also, 90vt... If you are here lurking, Man I love you!!!!! THANK YOU SO MUCH for the help over the years. those late nights became not so late due to your videos.
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Post by 190mech on Jun 10, 2018 20:23:49 GMT -5
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Post by 90GTVert on Jun 14, 2018 7:54:14 GMT -5
If you don't want to get into the case, then you aren't going to get too far. Biggest bores that fit the common GY6 are 58.5 or 59mm. Beyond that the cases have to be cut. So that only gets you around 155cc. Mine certainly ran better after a good bit of work into a 155cc setup, but I wasn't that impressed with the GY6 engine, especially since I wanted something that worked as a motorcycle, and I moved on. There are plenty of fast GY6 setups, but most got expensive and it made more sense to me to put that big chunk that I'd spend on a big GY6 into a bigger bike instead.
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Post by tortoise2 on Jun 14, 2018 8:20:32 GMT -5
Walked in the same store I bought the 50cc and came home with a 150. 150cc scooter brand, model, first 3 VIN characters? Unclear WHY you purchased another 150cc engine . . there are 125/150cc GY6 and GY6-B variations? Also curious . . was the 50cc a 4-stroke 139QMB, and what brand & model? |
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Post by fugaziiv on Jun 14, 2018 9:16:23 GMT -5
Hey guys, Short history. I drove a 50cc scooter daily for 3 years. Put 18.8K miles on it. Retired it due to not the engine but the body and everything else. Walked in the same store I bought the 50cc and came home with a 150. Now that im in a better place I purchased a 150cc engine and it just arrived. My plan is to keep it as an extra or use it as an upgrade. My understanding with a 150 is the biggest bore you can put on it is a 170cc (roughly). Would doing this really improve much? I also plane to replace all the stock parts with better quality parts. Think belts,CVT,hoses, ect. I dont want to go as far as cracking to far into the case... It requires a lot of expertise and specialty tools. however, I would like to take this engine and turn it into something "fun" for my scooter. Im looking basically for a recipe that is sound. Ive seen a lot of BS information being spread out on the internets and im looking to source only proven, honest information. 90vt from youtube had been my go-to for truth for all this time. However, I didnt see anything with him working on a 150 and a solid upgrade path. Thanks! Also, 90vt... If you are here lurking, Man I love you!!!!! THANK YOU SO MUCH for the help over the years. those late nights became not so late due to your videos. Here's a recipe for the most displacement/performance you'll get without boring/replacing the cases on that engine and without too much tuning. SSP-G 61mm Drop in - www.partsforscooters.com/169-485-SSP-G-Drop-In-61mm-CylinderHOCA A11 Cam (It has ALL the lift, requires some spring work. We've got a solution, and it's totally worth getting this right.) - www.partsforscooters.com/169-270-GY6-Camshaft-A11SSP-G 61mm Big Port Head - www.partsforscooters.com/169-204_SSP-G_61mm_Cylinder_HeadBan Jing Performance Intake - www.partsforscooters.com/169-29_GY6_Power_Intake30mm OKO PWK Carb (will need new cables and a remote choke) - www.partsforscooters.com/114-23_21_Minarelli_carburetor_2UNI Pod Air Filter (angled due to clearance) - www.partsforscooters.com/230-60-Uni-Pod-FilterYou'll need to tune the carb, naturally. Additionally there are all kinds of variator options that will work with this, but bang for the buck we've had lots of luck with this one. Genuine KOSO GY6 Performance Variator - www.partsforscooters.com/128-21-Koso-GY6-High-Performance-VariatorThe results? It's also got some sticky rubber on there. I've been running these tires for years and they've never let me down... they don't last too long though, maybe a couple of 1000 miles. - www.partsforscooters.com/search-results?search=kenda+k453Will it breath fire? No, it's not a race build. Does it have the power to wheelie? Absolutely. Did it stand up to multiple runs up and down the Tail of the Dragon, plus massive amounts of around town and through the mountains riding? Without problem. This is a setup that I have absolutely no issues recommending. There are some other parts that you can add, like a performance coil, but this is the essential stuff. This does also have a performance exhaust, with a custom header pipe to increase cornering clearance as it is a QMB frame with a GY6 bolted up. This bike is the reason I know that putting a top mount GY6 on a bottom mount QMB frame creates clearance issues. The only thing I'll add is that if you want an easier to tune carb at the expense of a little bit of throttle response, you can go with the 30mm CVK (which I personally prefer, but to each their own. You can use the stock cables and auto choke with this). - www.partsforscooters.com/114-34_GY6_Performance_CarburetorCost? about $510 (not including exhaust), more if you go with the CVK carb or add some additional items, like rollers and jets for additional tuning. Matt |
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Post by tortoise2 on Jun 14, 2018 11:01:50 GMT -5
Here's a recipe for the most displacement/performance you'll get without boring/replacing the cases on that engine and without too much tuning. Another strategy is purchasing a scooter that is ACTUALLY compatible with your speed expectations . . Genuine and Sym/Lance offer 169cc engines. |
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Post by fugaziiv on Jun 14, 2018 11:10:50 GMT -5
Here's a recipe for the most displacement/performance you'll get without boring/replacing the cases on that engine and without too much tuning. Another strategy is purchasing a scooter that is ACTUALLY compatible with your speed expectations . . Genuine and Sym/Lance offer 169cc engines. Sure, if you wanna take the easy way out. All kidding aside, I tend to agree... particularly if you don't want to build. Once again however, to each their own. The flexibility of the GY6/QMB as platform engines lends themselves to being played with, and as that's what builds enthusiasm in an ownership group. Same thing with the Minarelli. They are simply fun to build out. It's not a bad thing at all really, so long as you have a realistic idea of what you're getting into. Matt |
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Post by 90GTVert on Jun 14, 2018 12:16:45 GMT -5
Nice setup list, but I would like to see the vid from the first straightaway or clear traffic with the Duck.  Didn't realize there were 61mm kits that dropped in. I'm generally the modding type, so I'm all for it if someone chooses to make something of their own. Sometimes people enjoy the process. I like having the TMAX that goes fast for a scoot and is reliable without me doing much to it, but then I wouldn't feel whole if I didn't have some sort of project(s) around. Modding can also be a good learning experience. I wouldn't know much of anything about scooters or cars if not for modding. I never got excited or inspired thinking "I need to do my first oil change" or "hooray my brakes need service". To this day I'd be perfectly happy to let someone else do all of that stuff if money were no object. It's just work to me. Finding out how much difference it makes when I install an exhaust, cam, head, do some port work, modify a combustion chamber, and so on does give me some level of excitement and enjoyment and I learn along the way. It's like a science project to some degree. A science project that does wheelies. |
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Post by fugaziiv on Jun 14, 2018 12:40:20 GMT -5
Nice setup list, but I would like to see the vid from the first straightaway or clear traffic with the Duck. Didn't realize there were 61mm kits that dropped in. I'm generally the modding type, so I'm all for it if someone chooses to make something of their own. Sometimes people enjoy the process. I like having the TMAX that goes fast for a scoot and is reliable without me doing much to it, but then I wouldn't feel whole if I didn't have some sort of project(s) around. Modding can also be a good learning experience. I wouldn't know much of anything about scooters or cars if not for modding. I never got excited or inspired thinking "I need to do my first oil change" or "hooray my brakes need service". To this day I'd be perfectly happy to let someone else do all of that stuff if money were no object. It's just work to me. Finding out how much difference it makes when I install an exhaust, cam, head, do some port work, modify a combustion chamber, and so on does give me some level of excitement and enjoyment and I learn along the way. It's like a science project to some degree. A science project that does wheelies. Luckily, Deal's Gap doesn't really have any straights. lol The drop in 61's have been out for about a year now; they're pretty new. They work like a charm. A science project that does wheelies. I like that. Matt |
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Post by peascreek on Jul 11, 2018 10:29:11 GMT -5
I'd look at a used 250cc, my stock S 250 would smoke even a modded 150.
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Didn't realize there were 61mm kits that dropped in.