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Post by martins86 on Aug 22, 2019 20:49:55 GMT -5
Hello, To start let me tell you that i'm Portuguese so im sorry for my bad writing. I've started a project that i have in mind for my 50cc 2 stroke Yamaha Neos year 2002, i was tired of the high temperatures and the bad braking. so i decided to replace my engine for a Aerox engine minarelli horizontal Lc cooled rear brake disc. I've fitted everything nicely and it was riding nice with all the stock stuff. but that wasnt enough for me. So i bought a new variator ( Polini Hi-speed ) came w/ counter spring, clutch mini springs, and 6grs rollers (to heavy) i used 5gr. Than i order a Naraku 47c cylinder, it powered a lot my scooter but at high speed the scooter went off poor feeding. so i exchange my stock gigleur size 72 to 82, i bought a new clutch and fitted all. Now it have the 47cc cylinder a polini variator w/ 6grs rollers, a clucth from artek with white springs(i have red ones too) a counter spring blue polini from variator kit, a 82 gigleur and a top racing exhaust ( not good and not bad) and all the other stuff is stock in the engine part. The big problem now is that my scooter is highly reving before pulling and that is my problem it goes 5k rpm to pull off and it kicks hard but wont go any faster than it used to go... 60 kmh more or less this is an engine that should go 90 kmh minimun. I need Help to know what can i do to make it work perfectly.. i hope i can get some help here because in portugal i have to pay for tips. xD and im totaly a noob in this matter. i just like to do it myself. thank you all for your time and i'll wait for any ideas.   |
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Post by aeroxbud on Aug 23, 2019 15:12:49 GMT -5
Have you removed the restriction from the variator? There is a ring that stops the two faces closing up. If you have changed this to the new variator its still restricted.
Did you remove the restriction from the exhaust pipe?
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Post by martins86 on Aug 23, 2019 15:48:07 GMT -5
Hi thanks for the reply.
my exhaust or both exhaust dont have restrictors, i have another exhaust type stock SITO, i assembled it today, i exchange the gigleur to a lower one 78, and rollers to 5grs. now the bike is riding strong and goes fast to 70 kmh with a lot of power. about the variator restrictor if it is that slim ring between fan plate and and the tube that hold variator together i havent removed it. the bike still pull away at 5/6 K rpm and pulls strong. i was doing tests today i change springs and put all back again as it was. BLue counter spring polini white mini springs in clutch..it is reaaly better than yeterday when i post it. but still pull off on a very high rpm. another thing now is when im going almoast top speed i feel something wrong like if something is dragging and slowing it down or retrain it and i got scared havent reach full speed yet. but it's going higher than 10k rpm that is bad.
i think i need to level the idle revs to not loose power when i stop throtle. ( acelerate)
i tried to remove the variator ring once but nothing seemed right . so idk.
Thanks for help any more ideias im all ears. eyes in this case
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Post by aeroxbud on Aug 24, 2019 0:29:48 GMT -5
This video shows the restriction in the variator. Even with a sports pipe this will limit top speed.
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Post by martins86 on Aug 24, 2019 0:59:41 GMT -5
i dont have any washer tick like that. only the thin one... as in video showsafter that first plate only a thin washer. i never seen a restrictor like that.. xD thanks
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Post by 90GTVert on Aug 27, 2019 9:03:30 GMT -5
Since RPM is high, have you re-tried the 6g rollers or maybe a staggered mix of the 5g & 6g (5, 6, 5, 6, 5, 6)?
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Post by geoffh on Aug 27, 2019 14:57:42 GMT -5
That's a nice bit of kit you have,can you help us help you,is this a 49cc or is it 70cc?,that thin washer is just to space the variator outer plate leave it in there.Your new clutch is for racing it,s meant to kick in late right in the power band so try the stock one it,s more than you need,use a black marker pen on the variator face to see how much belt travel you have left,let us know how you get on.We do not charge for tips but when we "all rock up at your crib" (thank the grandkids) your buying.
Geoff
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Post by martins86 on Aug 28, 2019 11:56:49 GMT -5
hi thanks again for the reply and help. as i read a lot in 49cc scoot guides this is a trial and error process, i try a new few adjustments, i change rollers to 6grs and i soften a bit the clutch prings (Small White) clutch is adjustable. the scooter now i pulling earlier but slower too. i think variator rollers weight varies between 6 and 5 grs i'll try 3 of each next time. i think clutch is working good now. just need to set it right on the rollers. Geoffh related to u're question i have a 70cc kit Naraku. and im a bit worried about it. as you know allready im very very new at scooters and i try to do all by myself, as i was installing cylinder kit, i noticed that the piston was bigger tha the other i had i really dont know what is a 10mm pin and a 12mm pin.. probably i bought a 12mm and set it on stock cranck and is not good but i dont really know. so far is working good. therewas a gap between the connecting rod and the piston probably that is the 10mm to 12 mmm. i dont know. is working till is not. i know i have to change exaust and a get a reinforced cranckshaft and change all the bearing and oil seals for the crnk and the final drive too. kind a full maintainance.
I'll keep trying till i'll get it right. and i thank all for the support and help. any new ideas just write down here.. thanks
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Post by martins86 on Aug 28, 2019 12:12:56 GMT -5
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Post by aeroxbud on Aug 28, 2019 14:30:24 GMT -5
The Yasuni Z would work well with this cylinder.
Stock Yamaha is 10mm crank.
I would probably spend a little extra and get the cylinder head as well. At least you know you won't have a problem with the fit.
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Post by geoffh on Aug 28, 2019 15:21:08 GMT -5
Before you order those goodies take a step back see what you have,the naracu 70 bbk piston is larger in diameter to the OE 50cc piston but both are 10mm pins,that gap or side to side movement is normal and not a problem.As you are new to scoots you seem to be doing well.Your existing set up should be good but the main danger is running the engine lean and overheating the engine.fitting a crank is advanced stuff.like aeroxbud said the cyl head needs to be a naraku product.So here's 3 tasks,check cyl head, check belt length ,and variator unused portion let us know.
Geoff
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Post by martins86 on Aug 28, 2019 18:11:07 GMT -5
Hi thanks again. So today i tried to mix the rollers 6/5/6/5/6/5 the scooter looks normal now. Still need a good rpm to kick off arround 5k.but is ok. I like it now. I made a video i'll post it tomorrow. There s a thing i want u too see in video. Here is a pic of the black marker in variator. With the mixed rollers. About the naraku head u right i need to get it first. Probably for the best. And is not expensive. Heating haven t been a problem is good and is summer here really hot atround 35 °c. I dont have a temperature meter but ill get one. Is important. Maybe one made in china. Lol.  |
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Post by SMALL CC TEK on Aug 28, 2019 18:22:06 GMT -5
IS your belt using all the variator ? Is that a new belt of did you just reuse your old one ? It looks like it's running low might want to check it mark it and test it .. One mod at a time rule remember next time lol
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Post by martins86 on Aug 28, 2019 18:33:30 GMT -5
it is my old belt and is marked check the black fat stripe was till the center there's where belt is going max.
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Post by martins86 on Aug 28, 2019 18:46:05 GMT -5
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