fuel injected scooters By bilyum (Read 7,630 times)

[mauiboy]

Sounds borderline reasonable. The loosing speed up hill can be partially fixed just with a stroker, giving you the torque you need to maintain speed in the hills. More bhp does not always mean a higher speed where hills are concerned. More torque won't give you much by way of more speed on the flats, but you'll notice hills far less. A 200 gy6 is probably undersquare anyway, they'll have run out of bore long before they got to 200mm and strokes the only thing left really. A stroker will mean higher octane fuel is a must.

For real fun, maybe you could find a 150 2 stroke? means mixing oil etc but will have plenty of speed.

I would still suggest some work on the exhaust port, it should be cheap and easy and despite all the performance stuff related to porting, it should if done right extend the life of the engine by reducing overheating.

Not sure what you mean about adjusting for load, the EFI should keep you at the stoichiometric fuel ratio across the entire rpm range whilst taking into account altitude, so it should help if you have any large hills (read mountains). Yes it will keep you from going too lean, assuming its set correctly, which will keep away from some heat issues, but in summer, with a tricked out air cooled gy6 its still something to keep an eye on. Whilst not running lean helps, the bigger problem is simply the amount of combustion going on. Doubling the bhp of an engine is not impossible, but it requires a very thorough approach, replacing all critical components (valve springs, seats etc) and an engine that has the potential in the first place. A quality engine like a honda (i.e. the cbr250 has something like 22hp? I think, from a 250cc moderately tuned and emissions castrated engine, it can probably do 30hp) or a VW should leave plenty of scope, a gy6 will provide a more interesting challenge but well worth a try Let us know how it works out!!

[bilyum]

I want to sy thanks for enlightening me on this subject. I had no idea they required so much techknowledgy. All replies were great.

[justbuggin2]

sorry man i think i stole your tread

[mauiboy]

Feb 6, 2012 23:54:18 GMT -6 justbuggin2 said:

sorry man i think i stole your tread

threadjacking Welcome to the interwebs.

[justbuggin2]

i can see the benafits of the efi system and i see the benafits of the carb system it is mostly a personal choice if all is equal i think the efi system will out preform the carb that is way all the car company has gone with efi systems

[jct842]

Yup EFI will beat a carb for fuel economy,.........but......after you factor in the extra cost......probably would take 10 years or more on one scooter to save enough gas money to pay for the EFI. In fact there may be a point where you could never ever recover the cost to pay for the conversion to EFI. But its better.........john

[justbuggin2]

it is not the cost of the efi system i looking for it is the more dependable service i can get and the fact i dont like the carbs that come on these scoots

[jct842]

Maybe I am different but having ridden since 1958 I would hate to have to guess at how many miles I have put on motorcycles/scooters that have never had a carb problem that could not be cured by using a little common sense. That majesty I have is the only one that has or had EFI, it works great, but so did and does all of the carbs that were on all the other 2 wheel vehicles. EFI is not a magic wand that cures all imagined problems especially having a scooter that is a tad short on the power you think it should have. Should that majesty ever have the EFI fail, that scooter will be wearing a carb quicker than than you can spell carb. I like carbs because they can be repaired for little or no money and keep ticking after taking a licking. john

[kz1000st]

After owning bikes for almost 50 years I finally had to work on a carb when I bought the 1981 Yamaha. It was left to sit for over five years, maybe longer, and the inside was coated with barnacles from gas evaporating. After cleaning the jets, float hinge and scraping out the bowl it fired right up. The diaphragm works fine and throttle response is as good as new. Try leaving a fuel injection system like that and see how long it takes to get it running again.

[justbuggin2]

i not say carbs are all bad just the fact i hate the cheap carbs that come on this china made scooters the carb that is on the Yamaha is much better than anything that than comes on china made bikes and with the efi all that would have to be done is replace a feul filter and clean the injector and it would be up and running if it was let to set for years as well

[imnts2]

I have asked this same question several times. I started new threads because every time I looked at an old thread I saw most of the responders did not even own or never had owned fuel injected (except on the car or truck they drove everyday). Over and over I read the same old "common sense" stuff that makes sense except my experience as a mechanic, as an educated man, and as a driver was different.

Over and over I have heard the same old time worn "theories" while my experience was different. Those of us who drive EFI seem to forget the darn thing exists. Every diesel engine I have ever heard of is fuel injected. Setting a injection pump on the old ones was not a chore for the faint of heart amateur that is for sure.

Perhaps at one one time, EFI was expensive to put on a new scooter. But now , I am not sure it adds more than a hundred or so to cost (if that much) and - if you want to put a warranty on the scoot for more than a few hours, It may actually be cheaper.

But the big bang of a nice around 20% increase in power, 5 - 10% increase in fuel mileage, great reduction in repairs and a better lifetime of the machinery is a lot of benefit.

I finally realized we mainly hear only from Carburetor drivers (or fixers) and not EFI drivers. Maybe cause the EFI guys are riding and not trying to figure out how to get it started while they brag how cheap it is. I like cheap, of course, but I don't need it. I learned long ago that reliability beat cheap over and over.

It also reminds me of VW back in the 50 and 60's. You could hardly find a mechanic to fix one. That is till the mechanic's kids got busy fixing them in his backyard while his dad bad mouthed them.

So please, guys, if you do not own one or drive one, how about being quite and seeing if there really is anyone with one out there trying to figure out how to fix it instead of riding it? My Majesty is never in my shop except once in awhile for an oil change. My 150 never needs an oil change cause is not run much.

[justbuggin2]

well i am waiting for an efi kit to come to in stall on my bike i order it last nite and i should be gtting it in a week or so so i will let everbody know how it goes i started a new tread called efi system order i will be posting under that tread off how things go

[roboscoot]

(i have only more recently owned efis/scooters)....great when they are running not so much so when they break and repairs are expensive....
so i would not rx...for everyone .....certainly not the faint of heart....i use to ride bikes exclusively....until my hearing was getting adversely impacted....i brought an efi into my local mc mechanic
i was amazed at what he did not know about how to repair it....they seem to know the mechanics and a bit of electrical......ok for bikes but not maxi-scooters with 30 pin.....ecu...connector...with sensors controlling just about everything...

just my opinion.....the best scooter techs....know the wiring and electronics much better...and not as great...on the mechanical end of things.....of course we can never over-generalize.....just how i see it..

[justbuggin2]

well as i have sad before i hate the carbs on the scooters i know that putting an efi system on will not cure even thing but i like the challange of doing some things def. and i want a better running scooter i love my bike as is but i think there is always room for improvement if you dont like efi then dont worry i not telling you to get one i am doing some thing that i want and i will let every one know how the system works and any problems i have so that if anybody wants to try this they can and they will have more of an idea what is at steak when doing this coversion

[imnts2]

The first line - owners. I haven't read all of you. but I have not spotted any OWNERS. So I really don't care what you non owners think. You do not know. YOu just think and repeat other non owners dreams. Funny. not a one modern automobile has a carburator. Ever give that a thought?

Cheer
lefty2