New Student
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Post by bilyum on Feb 3, 2012 17:54:54 GMT -6
owner's , what do you think of your fuel injection. Rather not be fuel injected? Let us know! Any problems with it?
Thanks
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Post by mauiboy on Feb 4, 2012 16:42:48 GMT -6
FI is more expensive/difficult to work on than a carb. Better in the cold to start (although the carbed scoot just needs a varying degree of throttle depending on how hot or cold it is). The FI works better at extreme altitudes.
I never had a huge issue with carbs. In theory you also get better fuel economy with FI.
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Post by jct842 on Feb 4, 2012 19:05:05 GMT -6
If EFI were not so expensive I would be all for it on a scooter. On my majesty it is I an sure over $2000 of the price of the scooter new. Maybe even more than that. When you figure in the computer and all the associated parts that come with it...nice but not nesc. Starts with just a bump of the starter button, tells you when it needs an oil change or a new belt, the temp of road as well as the oil. Nice but I would rather have that money it costs in my bank. Carb's worked fine for my first scooter in 1958 and still work fine on my 2008 150cc. 50 years of progress for me. Should that efi quit on my majesty, when I get done crapping my pants I will order a carb and be done with it. john
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Post by tvnacman on Feb 4, 2012 20:59:48 GMT -6
If EFI were not so expensive I would be all for it on a scooter. On my majesty it is I an sure over $2000 of the price of the scooter new. Maybe even more than that. When you figure in the computer and all the associated parts that come with it...nice but not nesc. Starts with just a bump of the starter button, tells you when it needs an oil change or a new belt, the temp of road as well as the oil. Nice but I would rather have that money it costs in my bank. Carb's worked fine for my first scooter in 1958 and still work fine on my 2008 150cc. 50 years of progress for me. Should that efi quit on my majesty, when I get done crapping my pants I will order a carb and be done with it. john Very well said John |
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Post by justbuggin2 on Feb 4, 2012 22:08:35 GMT -6
i came across this looking to upgrade my scooter it is not too expensive might just get the 200cc motor from scrappy and put this on it
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Post by mauiboy on Feb 4, 2012 22:09:27 GMT -6
If EFI were not so expensive I would be all for it on a scooter. On my majesty it is I an sure over $2000 of the price of the scooter new. Maybe even more than that. When you figure in the computer and all the associated parts that come with it...nice but not nesc. Starts with just a bump of the starter button, tells you when it needs an oil change or a new belt, the temp of road as well as the oil. Nice but I would rather have that money it costs in my bank. Carb's worked fine for my first scooter in 1958 and still work fine on my 2008 150cc. 50 years of progress for me. Should that efi quit on my majesty, when I get done crapping my pants I will order a carb and be done with it. john Very true. EFI is not cheap, it is also something to get wrong. I have yet to forgive Triumph for putting it on the bonneville, and worse putting on a fake carb so it kinda looks the same. I'd have had one in a second even without a dealer on island if it was carbed but EFI tends to need an expensive computer thingy to make it feel better when it has a paddy fit. |
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Post by justbuggin2 on Feb 4, 2012 22:11:42 GMT -6
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Post by jct842 on Feb 4, 2012 23:58:58 GMT -6
you must be loaded,.....money wise anyway. For what a 150 costs, plus a second 200cc custom motor and a turbo..... That together can not have much of a life... You could purchase a new linhai 260 or better that would run rings around that, plus last 20 or 30 times longer! Didn't a gy6 start out as a 110 cc motor, then got a boost to 125cc and then some one thought a 150 was better... all with the same case and parts? as the cc goes up the longevity goes south. It would be fun but I would wear a steel jockstrap sitting on top that hand grenade. john |
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Post by mauiboy on Feb 5, 2012 3:46:42 GMT -6
and run 100ll avgas in it  probably with some octane additives, try get it to 120, and an inter cooler through a water matix would help (an air air heat exchanger would also work and probably be easier but would result in crazy lag). If you wanted to try it a 250 water cooled engine might be a better bet (if it still works), then you can work on uprating the water cooling capacity, and fit a huge ass higher pressure fuel pump. |
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Junior
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Lake Meade (East Berlin) PA
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Post by ccprof on Feb 5, 2012 6:00:00 GMT -6
EFI is stock on mine and I like it but occasionally it has a few quirks. I don't know if I would recommend converting.
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Post by kz1000st on Feb 5, 2012 8:29:31 GMT -6
EFI is a good idea but I'm not sold. With scooters having automatic chokes and diaphragm carbs it seems to me, "Close Enough." On my motorcycles you pull the choke lever, wait for it to warm up and then shut off the choke and even still it runs a little ragged til it warms. The scooter is totally twist and go with no hitches. Almost four years and not a single issue with the carb. None in the history of my bikes either. I'm sure we all have F.I. in our future. All my cars have it. Even the 1993 pickup has throttle body injection.
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Post by justbuggin2 on Feb 6, 2012 10:43:40 GMT -6
hink is the bike is paid for over a year i can get a 200cc motor for 500$ and the efi kit is 495$ so it will cost under a 1000$ that is a 1000$ less than a 2500cc bike new so i am thinking which way i should go
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Post by jct842 on Feb 6, 2012 19:21:41 GMT -6
I suggest you do some research about what it takes to get a 200cc built up motor running and to keep it running. If you like to spend all your time in the shop tuning and tinkering don't let me talk you out of it. But on the other hand you like to ride a lot more than fixing, you would be wise to skip it and buy a scooter that does what you want in stock form. Every time you get a sizable gain in performance You will be more than likely giving up some reliability. That 200cc scrappy engine is about double size of what that engine was designed for. How many other engines do you know of that can double their size with out penalty? What I would Like to see is a 200cc scaled up engine based on a gy6, but designed for 200cc with the same low cost theme. Then we could do some mods and still have some reliability .
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Post by mauiboy on Feb 6, 2012 20:22:08 GMT -6
So just the EFI, not the turbo  shame, the turbo would be way more fun. SO a 200CC GY6 engine is likely something like a 173cc? Maybe a 189? So how do they get there, normally they bore out the casing to the maximum possible, which makes the walls thinner, and they lengthen the stroke of the piston (giving you more torque) which increases the compression ratio and the need for higher octane fuel to prevent scrotal dismemberment. It is unlikely to be an engine you want to commute on, if you want something fun and for kicks, then it should be good for a laugh. I would give serious consideration to cooling, depending on your climate. An oil cooler, maybe even some kind of home fabbed water jacket cooler. The stock 150cc gives about 8hp, a ~200cc might give you 10-11, with an EFI you might get another 1-2hp. The overbore will cost you engine life due to increased heat and reduced casing thickness, some decent porting on the exhaust port might help get heat out of the engine quicker. A stock 250cc will give you 14hp give or take and be pretty unstressed whilst doing it. If you just want to have some fun then all credit to you, this should be a fun project, but its not the kind of thing you approach on the basis of logic, this isn't a sensible or economically sound choice. Its just bloody good fun If you are looking at it on a cost basis, get a 54b 250. If you really want fun, get that turbo!! |
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Post by justbuggin2 on Feb 6, 2012 20:54:12 GMT -6
i know that the vw engine started out making less tha 36hp and the motor that was in my first car (72bug) was making over 70hp both being air cooled and the one from scrappyies does come with the oil cooler . the efi system will let you get the best feul/air ratio through out the full rpm span so the over heating from being to lean can be avoided i would want this for fun rides around town and the trip out to the lake which is about 50 miles one way if i could get it to be able to cruise at 55 to 60 mph without losing speed going up hill i would be very happy that is another reason for the efi as it will be able to adjust the feul for the load as you going down the road
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