want/need assistance with hopefull next mod.

[Thebatman]

hey fellas.. juat a update on the s9 brake swap...i am still waiting for my brake pads to arrive so i can complete this mod...i did "black out" my lenses and install led tail/brake lights on my scoot yesterday..one more visual mod done..lmao... i have 2 things on my mind today.. this part may be stupid, but when you had mentioned for me to keep an eye on any overheating caused by my air induction...well, my ? is: since its a 2t/air cooled, HOW would i even know if it WAS overheating??.. the 2nd thing is: well, i am SLOWLY building a "super stocker", for lack of better term, but when/how/ will i know to ever upgrade my coil and cdi???.(cdi IS unrestricted of course). i got my new tach in the mail, and i am only hitting maxed out 6900-7500rpm(do have modded oem pipe on at the moment). wth? i was thinking upwards of 10gs at the least. i was also told that aftermarket coils, etc arent any different than oem. i may need to upgrade my ignition system, been thinking of it lately

[90GTVert]

If the engine gets hot, there's a good chance you will hear spark knock. Kind of a crackling noise. Can happen at WOT or often at part throttle. Otherwise you'd have to have a CHT gauge, or if it gets really hot you'd sieze it or possibly see the effects of the heat on the spark plug.

Since the CDI isn't restricted, I'd say you need to do that... never. Maybe if you decide to push the limits of a stock motor you could find one with programmable timing curves or at least one known to have a different timing curve. Otherwise, it will be a waste of money. A different coil is not necessary, but I think they are a good idea just to provide a better spark for any scoot. Not something you'll get any noticeable power gain from, but you might get a more consistent burn.

You definitely need to get the revs up to get the most from the 49cc. You could try lighter rollers to begin with. You'll prob need a tuned pipe to push the revs up higher and make more power.

[Thebatman]

hey 90gt, thanks for the reply.. hmmm, ok then how about if i happen to be blessed with a bbk soon, would you need to worry with a cdi then??...yeah, i have thought about a coil and running an irridium plug tho.. as far as the rollers i currently have 5.1 malossi, 4.5s seem to be a bit "whiny", slower..maybe 4.7s,idk. BUT, my take off still suffers, ALWAYS has. even worse when out riding and real warm. i am afraid that it has to be the worse ever on a scooter. i am always pushing with my feet just to help go better, top is apways good, just that initial take off. could that just be the tiny ass 14mm carb??.. i have tried learning the cvt tunning but i dont tink i ever have it dialed.. i mean i am of course a "big un"...lmao..around 230-235. maybe just my big butt too??. .....(idk ever if i should always start a new thread, wanna do one in "builds",lmao..i wish i could compete).......

[90GTVert]

None of my scoots have aftermarket CDIs. I just don't see them being worht the money unless you spend a good bit on the ones with different timing curves.

I like iridium plugs and have have good luck with them in the past making my scoots easier to start in the cold.

Sound like a set of stiffer clutch springs might do the trick for your takeoff. CVT tuning is tricky and takes time to learn.

I don't think the carb would be your problem. THe smaller carb should make the throttle more resposive and it would be plenty for a 49cc turning the RPM you are.

If you want a builds thread, make one. Nothing to compete with. That section is just about creating one thread for a scooter that will be worked on a lot over time so it's easy to watch the progression from stock to whatever the owner wants it to become. Seems like yours fits that bill.

[Thebatman]

thanks for the reply, sorry i didnt catch it last night.......... well, i dont think they make a 4000fly spring...i have ncy2000 in now, take off has ALWAYS suffered..... cool beans, maybe i can start a thread there..lmao... but, i was planning on doing my exhaust port this sat night bit i was reading in the "tuner handbook" and now i think i am MORE lost than before.. one sentence says alter the port itself NOT the header side, one says widen as much as possible, one says not, only lengnthen it...am i just freakin retarded or something.. even on s.i, was told 1mm higher,1mm on each side, not to worry with the 12pages of mathematics to figure it out.. i do need a degree wheel tho i think..lmao..thats why i wanna bore this thing out cuz i cant get the cvt dialed in EVER..i gotta be close tho..wheres my nasty,hard,quick takeoff or acceleration..i push off and drag till 12-15mph and then she hits

[90GTVert]

I think you might need to make sure your belt is getting down in the vari as far as it can. That can really change the initial takeoff. Here's a little more reading for you...

49ccscoot.proboards.com/index.cgi?board=transtech&action=display&thread=409
49ccscoot.proboards.com/index.cgi?action=display&board=builds&thread=437&page=8#5717

Keep in mind this is a 49cc. You will not have a hard takeoff like the bigger engines. Not saying it has to suck, but 49cc + a 200lb rider does not = blazing acceleration.

You are just gonna worry about measurements on the cylinder wall side of the port for a basic job. The header side just gets matched to the header to keep air flowing as smoothly as possible in and out of the prot and pipe. In between the cylinder and header side, you just kinda blend the port to keep it smooth. I think your best bet is still to go with about 1mm raise, 1mm widen, header match, smooth, and chamfer the edges on the cylinder wall. Maintain the crrent shape of the port the best you can. This way will be safe on the rings and less risky. If you wanna try something more aggressive, study up while you ride it as described. Then maybe you can see how much you can get out fo the cylinder once you have a 70cc around incase you go too far. Would be a good learning experience without a big risk of being scootless that way.

[Thebatman]

hey man, sorry i was looking at your thread..man, imma have to read all that.. 190mech seems to be a bad man... wish i had the funds to get that done....lmao... i actually printed that var mod off.. i thought about trying that but i only have the one var (besides oem).. oh yeah, on the vars it seems the ramp plate is the key factor there.. i had ordered a steeper one from vt, but my race var from ebay has lower ramps.(i assume for higher travel?).

[90GTVert]

190mech is a bad man. When he's not building pipes or swapping 2 strokes into motorcycles he's working on airplanes!

There's actually a bit to think about when it comes to the vari. What's shown in the threads I posted from 2strokd are the easiest ways to setup the variator better though.

[Thebatman]

the var should be the easy part to tune...lmao. i always thought it was gonna be easy,BUUUUUUUUT, as with the whole scoot thing, i got proven wrong. i am starting to think tje whole tuning process is beyond my grasp even tho i have had several wins throughout this stock build.. i would love another var to weigh.. mine is approx 2-3lbs HEAVIER than my oem var.(i may have stated that initially when i started). ...brake pads still didnt arrive today. i am eager to do that swap.. STILL havent gotten my next r pipe fixed yet either.. wonder how much 190 would charge to repair?....lmao cant seem to get much done around these parts.

[90GTVert]

There's definitely a learning curve. When you are trying to mod stuff it's pretty tricky and you really have to think about every move you make. Trying to figure out what will actually work for your scoot can be challenging alone. I've said it a lot, but it seems the more I learn the more I realize I still have a lot to learn.

If your vari is 2-3 pounds heavier than stock, I'd probably go back to stock. That is a lot of extra weight for the crank to turn. I've never even seen a var that weighs 2-3 pounds total I don't think. I hope that was a typo and you meant grams or ounces or something.

[Thebatman]

well, idk how much really..lmao. it feels 2lbs heavier than my stock.. this one did, at one time, belt did travel to outer edge..(may be the different pipe, but idk if it is really). it travels the same distance as the oem now.. if i put 6s back in take off suffers a bit worse, hills kill me then to. at least the 5s help hold up rpms uphill. i actually even wonder if my altitude, the mtns.,etc. are to blame for part of any issues. . oh, ia there any easier way to understanding those looooooong math equations in jennings book??. and can any of the timing,etc even be done unless engine is disassembled and a degree wheel used. that seems way over my head at this point but i know i am gonna need to learn someday....lmao

[90GTVert]

Thin air at altitude definitely isn't gonna help.

The easiest way to avoid some of the more technical stuff in Jennings' book is to read A.Graham Bell's book instead. lol (Two-Stroke Performance Tuning) There's still plenty of stuff that gets really technical and tricky, but I think Bell's book is a better choice for most of us to begin getting a grasp on tuning.

[2strokd]

90GT has a printable degree wheel here.
49ccscoot.proboards.com/index.cgi?board=yamajog&action=display&thread=353

I have one i use allot. Works good! I just put it on an old CD so its stable.

[Thebatman]

hey 2strokd, thanks man..i will have?to check that out....hell yeah.. i am going to open my exhaust port tonight and i am looking at my very 1st port map.. how do ppl get the piston line? on the port maps?. the line that goes thru all ports. any way to do any of this tonight also?. i need to start learning this also so maybe i can one day soon port ALL my ports... and are pics transferable from thread to thread??. i want to start a thread in the builds board but i have a few pics in 2 threads here, lost some cuz of my phone

[Thebatman]

me again, i am looking at my port map. my exhaust port is more square than anything.. isnt square worse than an ovalISH shape? dont i want curveture?