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Post by scooter3oy on Jan 19, 2009 11:28:38 GMT -5
Current Mods: Endrigo Stage II+ Head (Ported/Polished/Milled), YMS Racing - V8 Carbon Fiber Exhaust, A9 Cam, Oko 24mm Flatslide w/ Dial-a-Jet, 42/122 jets, Uni Pod Filter, Prodigy Over-Range Racing Variator (Teflon Coated) , 15g Koso Sliders, Gates Premium 842-20-30 belt, Manual fuel shut-off valve, All LED except headlights, Nitrogen Shocks, Vapor Computer, "De-humped" seat, Avon Viper Stryke tires Past Mods: 28mm Oko Flatslide, 30mm CV Carb i also tried locking down the motor mount, but reversed the mod because i didn't like the increase in vibrations  See here: Rigid Motor Mount Mod<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>    <<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>> When I hit 800 miles on my scooter, I decided to start the modding. I bought the scoot with the intention of modding it, and purely just for fun as a hobby. I have very little previous mechanical experience, and pretty much gained all my knowledge from ScootDawg...and my tools are not much more than a "Playskool" starter set ;D The mechanical mods started with adding a carbon fiber exhaust from PFS. Luckily the exhaust came with 2 different mounting brackets, a more common straight bracket that I've seen come with other exhausts plus another triangular shaped one. Good thing for the triangular one, since the straight one would not have worked for me, without having to fab additional bracket pieces. The triangular one did the trick, I just had to find a 1 3/4" spacer (may actually be a coupler nut?) and 4 1/2" bolt to fit between the bracket and the mounting hole on the rear of the scooter. At this time I also got rid of the stock air box, and added a Uni pod filter with a section of radiator hose and a PVC coupling. This setup with the stock 24mm carb was just temporary since I already had a 30mm carb on the way.  Update 02/15/09: wasn't completely satisfied with how the exhaust was aligned, so i replaced the 1 3/4" spacer (coupler nut?) i had originally used, with a 1" one, (i actually used a socket for a "spacer")   I had heard about how a 30mm carb might be a tight fit, especially when also using an aluminum intake, which is longer than the stock plastic/rubber one. Oh boy, was that an understatement !!! I pushed, prodded, forced, yelled, & cussed but I couldn't get the damn thing to fit. After I calmed down and looked at it closely, I realized it was not a matter of depth, or what technique I used to get the carb down in there, there just was not enough physical space between intake and the lower part of the frame cross member.  After studying the intake I had an idea...hacksaw!!! It looked like there was some intake that could go and still have enough area for a band clamp, so I sliced off as much as I thought I could, about a 1/8", from the intake.  I tried installing the carb again, but still no go by just a hair. Then I noticed there was a piece of carb that looked like it could go, so I sliced 1/8" off the carb.  That did the trick, I was finally able to fit in the space I had. I then installed the Uni filter with a new larger diameter radiator hose.  the 30mm carb came with 37/107 jets, which seemed kind of small....currently running 38/130 (02/01/09: now 132) |
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Post by pac1982 on Jan 19, 2009 12:24:16 GMT -5
Really nice set up man, my only critisim is that your intake pipe is quite long which means the carb has to do a lot of work to pull the air in
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Post by scooter3oy on Jan 19, 2009 12:39:00 GMT -5
thanks....the hose has been cut down  |
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Post by scootpup on Jan 20, 2009 11:24:50 GMT -5
Nice Pictures!
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Post by usfmarine on Jan 20, 2009 13:17:04 GMT -5
So it's running so poorly on 38/125 jets?
By what I've read, it seems those are the right jets for your setup. I am about to do the same mods you have done, so I look forward to hear how you get the scoot to run smoothly throughout the throttle range.
So how does it sound now?
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Post by scooter3oy on Jan 20, 2009 15:21:23 GMT -5
it sounds deeper and louder than with stock exhaust, but i don't think it's TOO loud....which is good because i didn't want an overly loud exhaust
to be honest, after i finally got the 30mm carb to fit, i felt pretty much done for the day and i just threw the hose and Uni on there mainly to see if the thing would start...which gladly it did ;D
next weekend when i have more time, i'll cut the hose down and double-check all the clamps and connections to make sure there are no air/vacumm leaks anywhere...plus i'll fiddle with the air/fuel adjustment screw
so i'm not sure yet if the jets are the reason why the scoot was running as it was on that one quick ride
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Post by jake318 on Jan 20, 2009 15:24:38 GMT -5
Sb the jetting numbers are close if not on the money . Maybe a little rich (nothing to speak of ) try this ... when bike is at idle spray stater fluid on manifold / carb hookup , if the RPMs rise you have a leak . Jake
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Post by usfmarine on Jan 21, 2009 10:58:05 GMT -5
Ooh, that's a good idea Jake, thanks.
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Post by scooter3oy on Jan 23, 2009 20:09:26 GMT -5
put in a 130 main jet today and it's running pretty good....prior to mods it used to pull to about 50, then slowly move up and top out in the mid 50's...now it pulls pretty good to mid 50's then keeps going....hit 60, but it was windy and i was on mainly residential streets so was not able to top out yet
basically engine feels stronger and throttle response is snappier
will try a 132 tomorrow
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Post by Doug in San Diego on Jan 24, 2009 11:18:18 GMT -5
Scooter3
I am also waiting to do the exact same project (parts are on the bench)
But Im curious. You cut some off the intake manifld then cut some off the carb.
Couldn't you just have shortened the rubber tube that goes in between them?
I don't feel to comfortable slicing up my new carb.
Also - Jake - How did you do this without the slicing
Great pics
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Post by scooter3oy on Jan 24, 2009 12:44:34 GMT -5
drierdan, the rubber tube wasn't the issue...when i put the intake in place, then held the carb in place, butting it up against the intake without the rubber piece, putting metal to metal, it was obvious that there was not enough space...some METAL had to go i was about to quit at that point, so that's why i got reckless and hacked up the carb....thankfully it worked out OK  also, the guy i bought the intake from includes some 1 1/4" filler hose with the intake, because he claims it's much more reliable than the rubber piece that comes with the intakes....this also helped me out because it's more flexible than the hard rubber piece and allows less space between the intake & carb here's a pic i got from the seller:  |
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Post by Doug in San Diego on Jan 25, 2009 13:53:15 GMT -5
I See
I'll keep my fingers crossed that my Lance Venice is slightly different, and I wont have to bust out the saw.
Another question, did the throttle cable go right back on no problem?
For some reason I feel like moving the location of the carb, even by a little must have some effect on the length or position of the cable. Did you have a problems?
Doug in San Diego
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Post by Doug in San Diego on Jan 25, 2009 13:55:31 GMT -5
Also
It looks like you have a manual fuel shutoff.
Do you?
If so what did you use to hook into the tank? And has it made any difference?
Doug
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Post by scooter3oy on Jan 25, 2009 14:23:00 GMT -5
yeah, the throttle cable went back on no problem, but i did have to use the throttle cable adjustment screw on the carb to take up some extra slack in the cable
the manual shut-off valve just replaced the vac operated one...the connection to the fuel tank is the same for both types of valves, a fuel line connects directly to the tank....i have: tank----fuel line----filter----fuel line----shutoff valve----fuel line----carb
some recommend putting the fuel filter between the shut-off valve and carb, but i haven't done that yet
(update: i eventually repositioned the filter between the shut-off valve and carb and ran the fuel line along the right side of the scooter, on a shorter more direct path to the carb)
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Post by harrywr2 on Jan 25, 2009 14:35:24 GMT -5
some recommend putting the fuel filter between the shut-off valve and carb, but i haven't done that yet It just makes changing the filter less messy if it is after the shutoff valve. |
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Post by usfmarine on Jan 26, 2009 0:38:53 GMT -5
scooter3oy, where did you buy that carb? Did you go with an autochoke?
If from ebay, what was the item number, I want to get the same carb that's been tested by a dawg here.
Thanks.
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Post by fordfasterr on Jan 26, 2009 7:46:57 GMT -5
just a note, longer intake tubes = wider torque curve =) No loss there !
Great mods by the way!
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Post by scooter3oy on Jan 26, 2009 10:59:21 GMT -5
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Post by usfmarine on Jan 27, 2009 22:27:31 GMT -5
When you receive and install the new carb, please report on your conclusions about your autochoke vs flatslide, I'm very interested.
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Post by xs650 on Jan 27, 2009 22:38:40 GMT -5
When you receive and install the new carb, please report on your conclusions about your autochoke vs flatslide, I'm very interested. So am I. I'm leaning towards a flatslide, but still soaking up information. I'm not afraid of jetting a carb. It will be a piece of cake compared to a 4 carb motorcycle. scooter3oy, Your exhaust looks great, but keep that 4.5 inch long bolt torqued to standard torque chart torque for that diameter and grade bolt and carry a spare with you. Don't use locktite, it will just mask the problem. Tighten it once a ride, the once a week after it stops moving on each long ride, then once a month after it stops moving weekly. If I'm wrong, then congratulations. How is the sound on that exhaust? |
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Post by scooter3oy on Jan 28, 2009 10:51:22 GMT -5
yeah, i keep an eye on the bolt, and i have some lock washers on it, so hopefully that helps some exhaust sounds mean....much deeper than stock....it's not too loud at casual cruising speeds, but when you go WOT, that thing opens up!!! ....definitely can't be ripping through the 'hood too late at night OKO 28mm flatslide is coming from overseas, so hopefully will be here next week |
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Post by xs650 on Jan 28, 2009 12:40:47 GMT -5
I've also been considering a 28mm flatslide. What are your thoughts on that vs a 30mm for a 150cc and a later 170cc+. Seems like people are happy with a 30mm CV on a bored engine and a flatslide flows better than a CV, so why not a 28 flatside? Are you getting it from Akunar in Thailand? Did you happen to measure the inside diameter of the V8 exhaust pipe at the head end? |
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Post by scooter3oy on Jan 28, 2009 15:03:31 GMT -5
i ordered from Scooter_Assassins, via EBay UK i read that a 30mm flatslide is quite a bit of carb, more so than a 30mm CV....and since i don't plan my mods going much more after the A9 cam, i thought the 28mm would suffice if you plan on going to 170cc, 30mm may be better for you...but i'm no expert, you'd be better off getting advice from more experienced peops  the exhaust header pipe is 1" ID |
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Post by scooter3oy on Feb 9, 2009 10:29:50 GMT -5
received the OKO 28mm flatslide (with "power jet") last weekend, but scoot is running so good now, i did not install it yet….also put in a metal exhaust gasket that solved a small exhaust leak I had have chaulked up the freakin' high start-up idle to the auto-choke, and will live with it until i put the flatslide on the flatslide is so much lighter and more compact than the CV, the weight savings alone should give a performance increase   |
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Post by Aerostudent on Feb 11, 2009 19:56:26 GMT -5
xs650, have you ever ordered from akunar directly via that site? Those prices are in my range (student)!!! If that is indeed a decent site, I might just order a similar carb!
Aero
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Post by scooter3oy on Feb 16, 2009 9:22:00 GMT -5
i installed the OKO flatslide last weekend...why try a flatslide?... 1) i think the auto-choke on my 30mm CV is messed up (super high start-up idle), 2) i hated the way the fuel mixture screw was on the bottom of the CV, 3) just for kicks because the FS is so much narrower & compact than the CV, installation was much easier...used a new intake manifold, which didn't even require any hacking up this time did have to change throttle cable, because the FS needs a cable with a smaller nipple on the carb end...i also thought i wouldn't be able to get the under the seat bucket/storage back in because of the way the throttle cable sticks straight up from the carb....but luckily i just "barely" avoided the throttle cable with the cross piece that supports the end of the bucket results....yikes, scoot wants to jump out from under me now...throttle response is instantaneous and idle is super smooth ordered a variety of pilot & main jets to experiment with different sizes, but seems to be running pretty good as is with the stock jets, 39/130...just getting a bog if I go WOT from a complete stop, but if i roll on the throttle smoothly, power comes on nice and strong i have some 10g and 12g Dr. Pulley sliders, was going to wait, but may play with them before I install the A9 but that will have to wait a couple of weeks, going to New Orleans for Mardi Gras ;D 30mm CV vs. 28mm Flatslide Carb  Flatslide Installed  |
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Post by jamescell on Feb 16, 2009 11:31:13 GMT -5
I was about to put a 30mm cv in that I have had on my bench for a while but now you have me thinking about just getting a flatslide and skip the tight fit headaches! Where did you get your throttle cable at?
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Post by scooter3oy on Feb 16, 2009 13:00:43 GMT -5
i picked the throttle cable up locally at a motorcycle shop
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Post by jamescell on Feb 16, 2009 13:46:01 GMT -5
Any idea what bike it was ment for? The shops around here absolutley refuse to sell me anything if I can't tell them what its for, and will actually hang up if you tell them a chinese scooter.
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Post by dogmeat on Feb 16, 2009 13:53:03 GMT -5
Hey great post!!
How come you used a 28mm FS?
I thought most people put in a 30mm?
I just wondering as i wasnt concidering a FS myself.
Thanks.
P.S- Exactly which carb did you buy from Akunar? I'm having trouble working it out.
Thanks sir.
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