out of my mind and broke
I have been waiting years to get another bike since my fzr 600 and every year it's something else that pops up and I must use money for it. I just quit my great paying job of long distance tractor trailer driving to be with my wife and son and drive locally. I was looking online for bikes and saw great deals EX: 2008 cbr 1000rr for $2800, guess someone really wanted to get rid of it. But I don't have that kind of money now. So what did I do? I just purchased a X18 R super pocket rocket. Once you stop laughing please read on. Does anyone know how I will be able to up the performance, maybe get 75mph out of the bike? And what is the reputation for these bikes? Thank you, and hope I made you laugh. See you on the streets. Got the bike and making mods already. Chinese POS but it's my POS, and it looks great and so far performing well.
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If I was you, I would be looking for a 250cc Japanese bike. Honda CB250, Kawasaki Ninja 250, or something like that. Get one that's already ten years old or so. Doesn't cost a lot and these bikes are very durable + economical. A CBR 1000 is fun, but also costs a lot more to run and maintain. Gas guzzler bikes!
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If you want to spend time with your wife and son, don't ride a crotch rocket. :D
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F650CSs/GSs are quite good at FE too (could be 250s by their appetite) and fun (if you happen to like singles), but they're not really cheap. |
First, I'm not laughing. I just Google'd that bike. Not bad at $679 plus another $100 in shipping and you're in the wind.
Second, the ad claims up to 70+ mph. It is a 110cc bike, in many states you need more than that to get on the freeways. Some states want 125cc's and others want 225. So, it sounds like it will be plenty fast enough for non-freeway use. Finally from what I have seen these bike use an engine based on really old Honda motors and some parts are interchangeable. I had a 1983 110cc Honda three wheeler that went for years with basic maintenance, so who knows, you might get lucky. Enjoys it for what it is. |
What is the use of the bike ?
Commuting with as less fuel as possible or blasting around ? If the first, I'd say work on aerodynamics then gear up. If the second then performance parts to add some extra rpm on top of what's already there. I understand those horizontal single respond well to freer flowing inlets and obviously a longer duration cam. Or maybe extra capacity ? Once you get those extra MPH, you might realize it is still bloody slow (not to mention the likelihood of it breaking down) compared to whatever else you might have bought with the money, say one of those late 70's 400 cc japanese bikes ... |
Were you able to plate that bike?
Kirk |
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Changing the sprockets would be the first thing to try. If it cannot pull a higher gear the normal intake and exhaust mods might help. It says 15 HP!? that cannot be true as my
170cc fuel injected scooter only make 15 HP. Matching the tubes going into the engine and a mild port job might give you a touch more power. Use thin synthetic oil and a iridium spark plug will help too. Use what you got! Enjoy it! |
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I run a 125 cc 2 stroke KTM dirt bike on the street. It is capable of over 140kph maximum speeds and sustained 120kph depending on sprocketing. You cannot just put the highest ratio on and expect good performance. Typically you have to experiment to have the maximum power arrive at the highest achievable speed. Any higher ratio lowers maximum speed and kills 1st gear performance. The 2 strokes especially are very susceptible to carb jetting. My initial highway fuel mileage was only 27-35mpg(imp) with the stock jetting. The 2 stroke would not my first choice for fuel mileage, but does prove you can still ride a small displacement bike on today's streets. Current fuel mileage is only about 55mpg(imp) maximum.
http://sphotos-b.ak.fbcdn.net/hphoto..._4936935_n.jpg http://sphotos-h.ak.fbcdn.net/hphoto..._2896505_n.jpg |
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workaround ideas to discuss among friends: Two-stroke engines: still a viable technology? |
Although I hate and despise 2-strokes as they are now (I'm sorry, it might be a prejudice from my behalf), I find their simplicity appealing. I'd really like to see a cleaner and more effective direct injected variant on bikes, I'm really curious what kind of FE they could achieve. And I hope that they wouldn't smell of wasted fuel like the blue-smokey oldtimers and 'modern' scooters.
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BACKGROUND TO BERNARD HOOPER ENGINEERING LTD and there are big two-stroke diesel engines with sealed crankcases. cheers, Michael |
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http://motor2t.net/indexI.htm - the developer of this one used some chainsaw engines as the base for the project but recently was intending to convert a Honda Cub engine to 2-stroke, altough I don't know if he already did it. |
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I managed to find fuel economy numbers for I think ski doo ? snowmobiles. They had a direct injected 2 stroke and a 4 stroke. The 2 stroke was much lighter, but got worse (I think like 30% worse) fuel economy than the 4 stroke with equivalent power despite the direct injection. I think the problem is that in a 2 stroke with fuel injection, the fuel has less than 180 crankshaft degrees to mix with the air, so the combustion efficiency is still pretty bad, just not quite as bad as in a carbureted 2 stroke. |
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Two strokes gets very poor MPG capacity wise because of therir very low CR.
No if the MPG is related to output rather than capacity, maybe it is a little better ? |
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My KTM125EXC motorbike gets 55mpg. Not very good for a 125 motorcycle but this is a full sized dirtbike with about 35-40hp. A similar 35hp fourstroke 230 lbs dirtbike would get about 55mpg too, in the manner I drive it. Snowmobiles cannot be given MPG figures because conditions vary so wildly. When I go snowmobiling with a crowd, the 4 strokes typically take less fuel at the pumps, but often not by much. Especially considering the performance advantage most of the 2 strokes have. Modern fuel injected 2 stroke snowmobiles are remarkably frugal on fuel compared to the snowmobiles of yesterday. Again in outboard motors. Modern 2 stroke outboards, even carbed models, are very good on fuel, almost as good as 4 stroke models and much, much lighter. I think there is a future for 2 stroke advancement, with lean mixtures, ecological oils and efficient designs. 2 stroke diesels make a lot of sense, oil injection targeted at the bearings, and other innovations. I am actually doing a lot of work on a Yamaha 200cc air cooled quad engine, trying to increase power over stock. This is a 17hp motor that my son and I have increased to over 30hp without a noticeable increase in fuel use (as determined by range and running time on the small tank). There was mention of the low compression ratio typical in modern 2 strokes. Not really a fair comparison. A 2 stroke can use 8:1 compression to make high HP because the exhaust pipe has a supercharging effect. A modern 4 stroke bike engine uses up to 12:1 compression because the wild high rpm cam timing bleeds off so much of the compression pressure. So much work as gone into weight reduction in modern cars. A 2 stroke already meets that mark. Just think if we could be driving 500cc cars with variable port timing and exhaust length to give both power and economy. That 500cc motor could weigh less than 30kg (70 lbs) and put out more than 100hp with very few moving parts. |
A lot of fuel in a piston port 2T engine gets dumped unburned out of the exhaust port which is why a direct injection 2T that can wait until the exhaust is closed before putting in fuel will have much better fuel consumption.
A 2T generally has more than 1/2 the BMEP of a comparable 4T but has 2X the power strokes so you don't need as big of an engine to get comparable horsepower. The new Moto3 4T singles are probably not making any more (if as much) power than a 125GP 2T engine does. cheers, Michael |
In spite of all the criticism, 2-strokes are still among the best options for fuel-savings and also maintenance cost-cutting.
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