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Post by arkie on Jul 31, 2016 11:24:11 GMT -5
There is (somewhere) here a comparison of lots of different pistons by weight. I can't seem to find it now. Link
Then there is the sealer-obstructed oil passageway scenario.
NOT selecting at least a 125cc scooter sill remains the most common regret . . as evidenced by the numerous repeated BBK queries by the "game the system" crowd. Doesn't take all that much effort to get a motorcycle endorsement in most states . . study the manual, pass the written, and drive around a few cones for the practical. Get insurance, register the scooter, and concentrate on avoiding collisions . . instead of eluding statute consequences.
Game the system? lol there are many and varied reasons for doing these conversions. The most obvious I know of is that riding a scoot that only does 30mph is freakin dangerous. As for people trying to sidestep a few ill conceived laws written by politicians that are completely out of touch with reality I say more power to them. I have a 150cc and a formerly 50cc. If I'm only going 5 mi or less I will take the 50 EVERY time. The 150 is just too heavy and cumbersome, though it does ride nice. I have no idea where the notion that some have that modifying a scoot could in some way be illegal. Has anyone ever even heard of a teardown inspection? IMO if the vin says 50cc its a 50cc. Since a 2t scoot can easily surpass the performance of a 4t even with a BBK I have zero qualms about modifying my 50cc any which way I can. |
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Post by Deleted on Jul 31, 2016 11:45:07 GMT -5
Link
Then there is the sealer-obstructed oil passageway scenario.
NOT selecting at least a 125cc scooter sill remains the most common regret . . as evidenced by the numerous repeated BBK queries by the "game the system" crowd. Doesn't take all that much effort to get a motorcycle endorsement in most states . . study the manual, pass the written, and drive around a few cones for the practical. Get insurance, register the scooter, and concentrate on avoiding collisions . . instead of eluding statute consequences.
Game the system? lol there are many and varied reasons for doing these conversions. The most obvious I know of is that riding a scoot that only does 30mph is freakin dangerous. As for people trying to sidestep a few ill conceived laws written by politicians that are completely out of touch with reality I say more power to them. I have a 150cc and a formerly 50cc. If I'm only going 5 mi or less I will take the 50 EVERY time. The 150 is just too heavy and cumbersome, though it does ride nice. I have no idea where the notion that some have that modifying a scoot could in some way be illegal. Has anyone ever even heard of a teardown inspection? IMO if the vin says 50cc its a 50cc. Since a 2t scoot can easily surpass the performance of a 4t even with a BBK I have zero qualms about modifying my 50cc any which way I can. The Authorities are probably on their way to your location, ha ha. I agree with you. If a stock 2T has like 5 hp and we mod our 4T's from 3 to 4 hp, I don't see that as wrong. The folks that wrote all of those glorious laws and regulations probably can't even change the oil on their own vehicles. Bill |
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Post by wutno on Jul 31, 2016 12:40:05 GMT -5
Crank died after about 3000 miles with the BBK, had 2K stock. (which is why I have a thread open looking for a new engine  ). It was real nice while it lasted, huge boost in takeoff speed and getting up to about 45-50. Can't say I'd do it again tho. |
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Post by humanshield on Aug 1, 2016 11:59:34 GMT -5
Crank died after about 3000 miles with the BBK, had 2K stock. (which is why I have a thread open looking for a new engine ). It was real nice while it lasted, huge boost in takeoff speed and getting up to about 45-50. Can't say I'd do it again tho. Would you say you rode it hard or conservatively ? Did you push it to 45 often...as in most of the time? |
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Post by joshua864 on Aug 1, 2016 21:21:24 GMT -5
Not voting yet but I have about 1.5k miles on 50mm kit.
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Post by wutno on Aug 1, 2016 22:47:21 GMT -5
Would you say you rode it hard or conservatively ? Did you push it to 45 often...as in most of the time? When ever I was moving it was at WoT unless I was in the centre of town where people only drive at ~15. So yea 45+ all the time, changed motor oil every 300 miles (which I know is not necessary). I started noticing the starter motor was having trouble starting the engine until one day I heard some terrible noises and then the engine cut out, took off the head to check everything out and saw pretty much the same thing Brent saw were there was very hard to move the conrod up and down. |
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Post by 90GTVert on Aug 2, 2016 11:04:15 GMT -5
IMO if the vin says 50cc its a 50cc. That is what the MVA told me on a couple of tries at different times with different employees when I tried to register a modified 2T as a motorcycle. I explained to them that I was capable of speeds greater than 50MPH, where 49ccs are limited to 30MPH here. I told them my displacement was above 50cc and that my horsepower exceeded the classification for a 49cc. They told me that it will always be a 50cc and cannot be considered a motorcycle. My main qualm with their rulings is that I feel the law will get used however it works out best for the state. If they don't want me to tag it, then it's always a 50cc regardless of mods and can only be stickered as a 50cc and below moped classification. On the other hand, if an officer wants to give me a hard time or it may allow some hefty fines to be collected by the state, they would be more likely to tell me that it's modified and now considered a motorcycle and not a moped. Regarding a 125cc+ being the smart choice, I'd say not always. I feel much safer on my modified 50s than my 155cc. The 150 just couldn't keep up with traffic, but by law I am supposed to stay in the lane of travel. On the 50s, I can ride the shoulder and stay out of the way. I find it more relaxing and enjoyable to ride the 50s here. A much larger engine that could keep up with traffic would be a different story, but then you end up with compromises like weight and often a larger cost difference. I think the 150s would be excellent for people that do town/city riding though. If you use one essentially like most use a 50, they won't be stressed and have a nice torquey feel so leaving red lights and stop signs doesn't have even big riders like me worrying about holding up traffic at all. |
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Post by 90GTVert on Aug 5, 2016 7:17:14 GMT -5
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Post by dexameth on Aug 7, 2016 7:07:16 GMT -5
I installed my 50mm BBK back in April I believe, and run it pretty much every day. I'm hard on the little guy too. I ALWAYS let it warm up no matter what. I'm WOT, maybe, 75 percent of the time. Only in neighborhoods and the beaches am I easy on the throttle. Most roads I'm tucked at 45-47 and I wish I knew the rpms; it doesn't sound too high though. I also try wheelies a lot, and used to do burnouts (until my recent new tire install, haven't done one yet). Still, this motor seems to be doing just fine. I've adjusted the valves once. I won't let ANYONE work on my scoot, I like to know what's been done and how.
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Post by humanshield on Aug 7, 2016 11:42:21 GMT -5
I installed my 50mm BBK back in April I believe, and run it pretty much every day. I'm hard on the little guy too. I ALWAYS let it warm up no matter what. I'm WOT, maybe, 75 percent of the time. Only in neighborhoods and the beaches am I easy on the throttle. Most roads I'm tucked at 45-47 and I wish I knew the rpms; it doesn't sound too high though. I also try wheelies a lot, and used to do burnouts (until my recent new tire install, haven't done one yet). Still, this motor seems to be doing just fine. I've adjusted the valves once. I won't let ANYONE work on my scoot, I like to know what's been done and how. Thanks for the feedback dexameth. Your motor is very young yet. Probably less than 1500 miles since install of the 50mm BBMK (estimating) I do believe people when they say the BBK is more likely to fail because of the piston weight. I don't run my scoot hard in fact, I try to take it easy because I want it to last. Granted, I have run it up to and past 8,000 rpms many times. But doing burnouts and wheelies ? I think that's the kind of stuff that will probably give your crank bearings hell. If you can get your 50mm BBK to last 3,000+ miles with your style of riding that would be awesome. Keep us posted. But I'm placing my bet that yours may not last too long. For high rpm and racing type abuse the 47mm kit probably is better in the long run. . |
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Post by Deleted on Aug 7, 2016 12:49:51 GMT -5
"It's better to burn out, than to fade away." Neil Young.  Bill |
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Post by Deleted on Aug 7, 2016 13:06:21 GMT -5
Some superstars burned out at 27 years old. Neil Young must use "slow burn" by David Bowie.
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Post by ThomasTPFL on Aug 21, 2016 9:58:17 GMT -5
I havr one on my son's bike. Same starrider kit I think. It's probably around 500 or so miles now, no gauges on that bike.
It gets whooped. Downtown riding, nothing but on/off throttle.
Its still going strong but the engine is getting noisier and noisier.
My next 139qmb build, probably this bike when it breaks, will get a crank just because I have a friend who did the true 100cc+ build on his and the performance is rather amazing.
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Post by humanshield on Aug 21, 2016 10:44:42 GMT -5
I'm right at 4,000 miles now with my 50mm BBK and still going strong
And Iv'e been over 8,000 rpms many times. This was using a very neglected motor I pulled from a junked scooter that was really nasty inside. Just luck? Maybe it's getting the mixture right? (I run a bit rich).
Maybe I lucked out and got a motor with quality bearings? No idea.
I can say this.....
I don't abuse my scooter. I don't accelerate as hard as it can every time. I don't push it to 45 every ride.
I use it daily as my errand runner and truthfully, I often ride it gently.
I use the torque when I need it, but take it easy on it when I can. I'm just very happy to have a reasonably capable little scooter than "can" do 45 if needed, can almost maintain any speed I want up inclines, and accelerates with traffic just fine whenever I ask it to.
That's my style of riding. So maybe that's also why mine is lasting.
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Post by cwazywazy on Aug 21, 2016 11:38:10 GMT -5
I'm sure riding style does a lot for longevity of a BBK. I ride my scooter WOT almost all the time and it's got a 52mm kit. It's only got like 100 miles on it tops right now, so we'll see.
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). It was real nice while it lasted, huge boost in takeoff speed and getting up to about 45-50. Can't say I'd do it again tho.
