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Post by greens on Jul 30, 2013 9:45:39 GMT -5
Clean! Attachments:
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New Rider
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Post by greens on Jul 30, 2013 11:37:46 GMT -5
Been doing some research and it should totally be worth it!
But then there are all kinds of things that actually squeeze pretty huge margins of performance out of the thing!
First thing I will do is get some good oil, gas, and do the CDI wire thing.
I like the idea of cleaning the carb, but if I’m going to get at that I might as well do some other stuff too right??!
Now, I guess I would ask where do you think the lowest cost/biggest performance gains are?
People are saying exhaust is a huge gain, but is that before or after making the other modifications to allow a free flowing exhaust to benefit the engine?
I would also like the first things to kind of get my feet wet with the engine itself.
I’m not looking for a big bore kit or anything, just some simple things like plates/washers that can be removed without causing imbalance or decreased life, in addition to minor parts to help tune the modifications made. Anything I can do to increase life is of course a good thing too.
Lets say you had my scooter and a tiny bit of cash, say… less than $200, what would you do?!
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Post by scootnwinn on Jul 30, 2013 15:34:18 GMT -5
People are saying exhaust is a huge gain, but is that before or after making the other modifications to allow a free flowing exhaust to benefit the engine? Setting up a proper expansion chamber exhaust is a good place to start. You will want to go ahead and pull the carb to clean it and find out what size jet is in there you will need to go up 5 steps or so. A free flowing filter should go on at the same time as well as a variator weight swap (sliders are a nice upgrade on the cheap and you will need it to rev to really benefit from the pipe) All of that kinda needs to happen all at the same time or none of it will work properly and may even seize you motor. One of the best performance mods is ditching the stock tires. Those look like 10's I like Michelin S1's for them. If you have some change to spend have a look at Heidenau tires... |
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New Rider
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Post by greens on Jul 30, 2013 16:37:29 GMT -5
You guys have an awesome forum, and the old one has a huge wealth of information too. I’m sure it will all be crystal in a few weeks, but right now a lot of it goes over my head.
One thing I am confused about is how everyone kind of refers to the exact same things, but they all have different scoots!? Or something?
Are all the engines pretty much the same? (all of them probably get cease and desist letters from Honda daily right? Haha)
I’m interested in seeing a manual of my engine, parts sources, etc. so I can shop around and put pictures to names of things.
I know the engines are simple as can be, so it will just be a matter of time.
There is so much plastic! WHERES THE CARB?! Lol jk... maybe.
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Post by greens on Jul 30, 2013 16:45:04 GMT -5
[replyingto=scootnwinn]scootnwinn[/replyingto]This completely agrees with what i have been reading.
Often i am hearing things referred to as "The Pipe"
Gotta be an exhaust pipe?
I think the best way for me to do this is get my hands dirty. Although i do love me a good manual.
But where would i find out what engine i have?
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Post by scootnwinn on Jul 30, 2013 18:21:07 GMT -5
Pipe is the exhaust in your case you want to find what is properly called an expansion chamber. Your engine type is stamped near your CVT cover it's a set of random numbers and letters. Post it here and someone can tell you what engine yours is a clone of and you can buy a manual for that bike. Your carb will be sitting at the bottom of your cylinder most likely on top where the cylinder meets the crank case
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Post by scootnwinn on Jul 30, 2013 18:21:42 GMT -5
Oh and glad you are enjoying the forum
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Post by greens on Aug 4, 2013 15:08:34 GMT -5
Sorry for not posting but i have been super sick, like worse ever in my adult life, now that i am recovering i can do some light work on the bike!
OK SO
The Hyosung Racing Prima as well as many other "SF50" style scooters, have 3 forms of restriction, i think.
The CDI.
A plate in the intake
And a ring in the variator.
The CDI is in the front, it has 2 wire clusters coming out of it. one with four, one with two. The cluster with 4 is what we are after.
Some say go in through the light but that would seem a nightmare, just take half a dozen screws out to let the entire front panel off.
Mine has a brown, blue/white, black/white x2.
Yank out one black/w and plug the cluster back in, i get no start.
Plug that one back in and unplug the other one and the restriction is gone.
If you yank out a black/w wire and it still starts, congrats, you did it right the first time!
The intake plate is visible from the outside of the bike, its a thin piece of metal restricting intake size, sandwiched between a flange and the engine. if you take out the seat/bucket you are looking straight down at it.
4 brass like screws on one end and 2 nuts on the other hold the angled peice in place, take it off to reveal the plate.
The ring is inside the variator? behind the kick start. Remove the cover, remove the C clip, remove the REVERSE 22mm nut, slide off the plate behind it to expose the belt. The belt will have a ring under it. remove ring, put it back together.
When i cut the CDI wire it seemed to only allow me to go downhill faster.
When i removed the intake plate, nothing seemed to happen as far as i can tell.
I'm thinking this will be more evident once i start upgrading a few things.
Exhuast, jet,and weights.
When i removed the ring i unleashed the beast within and reached a blistering 37mph on flat!
I am still having some minor electrical problems that go away and come back. Which leads me to believe its simply the battery.
Fuses are good.
Hopefully i will get into the DMV next week so i can start taking her out more!
Really though, going from 28 to 37 mph by cutting a wire, and removing 2 pieces is great!
I think i will hold off on the performance exhaust until i get the thing cleared by CA highway patrol. I also need to ensure that my electrical problems will not occur while they are checking my turn signals! It sounds like i'm going to have to go through that considering all i have is a Certificate of Origin from 2007, from a dealer in MO.
I wouldn't have thought tires make much of a difference!
What am i looking for in a good tire? An increase in size would mean an improvement of top speed, but it must be more than that?
Prices on them very dramatically too. Otherwise i guess i'd do the same thing i do with my cars, whatever is cheapest. I wouldn't want to spend hundreds so i can scrape my knees on the pavement or anything.
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