150cc gy6 user from asia here

[scootie]

hi fellow gy6 users, my scooters is a zongshen t-8 which looks like the aprilia area 51. some owners of this bike told me they can run upto 75mph in stock form, how come mine can only do 58mph? BTW, theres a lot of mods here too for our engine like the 4 valvle, 170cc block, stage 2 n 3 cams, hi-comp piston, etc. what should be my 1st upgrade? i was told that our cdi is already de-restricted, is there a way to know this? ;D ;D

[Dave]

I suggest you start at the air intake remove any air box put a direct filter right at the carb intake.
Then re jet the carb
Then change variator, weights or go to a racing one
now work on piston, cam
then port and polish
follow with a tuned exhaust.
get a tachometer.
You will need to get racing tires
stock tires will not take your new speed and power
you should approach 12000RPM's
and 80 plus miles per hour even 90MPH

[Admin]

To add to that, anybody that tells you these scoots will do70-75 mph stock is flat out drinking too much or trying too hard to sell them. Most of them do mid 50's.

[Admin]

Oh yeah, forgot to thank you for posting from Asia. Scooters are fun just about anywhere you go.

[scootie]

thanks dawg and dave, so far i've added high flow air filter, went 1 size higher carb jet, change to racing variator....but havent tested it yet

[scootie]

do you guys know what size our stock carb jet is? what size should i use in conjunction with the unifilter and v8 pipe?

[Admin]

Depending on your bike, you probably have a stock 108 or 110 main jet. It has been recommended to me by some tech guys that around 112 to 120 is appropriate with the muffler/filter changes. The best way is to buy a jet set and try different sizes and do plug reads.

[scootie]

took the main jet out, it was marked with 98, assuming thats the size, would 105 be enough? my plug tip is light brown, is that "lean"

[Admin]

Light brown is good. Here is a link to reading plugs.
tinyurl.com/m3knc
The only way to know what size to use is to experiment with different sizes until you get the best performance along with a good plug read. I'm surprised your main jet is that small though. Is your carb a 24mm?

[scootie]

i was also expecting to see a 105 main jet, anyway, i'm now using 105, and also got a 115 and 120 just in case, yes im still using my stock 24mm carb

[medman1952]

Hi,
Glad I found this forum. I'm new to scooters, I bought a little 49cc scoot for my son a couple months ago and am now thinking of one for me. What I have been looking at is the Tank 150 touring or waiting for the 250 to come out. My concern about the 150 was that it would not get up to speeds I might want to get to while riding to work, about a twenty mile ride.
Does anybody know if this gy6 motor is what is used in the Tank? I might go the 150 just because the price is right, if changing a jet air cleaner and exhaust will get it to go to 75 if needed. I could be happy with that. Also where do I find the parts distributors.

[fulltilt1]

The Tank Touring 150 is a GY6. Most of these 150cc GY6 scooters will get 50-55mph stock. Just changing the pipe ($200-300) and the aircleaner/jet ($10-50) will get you to 60+mph. Getting to 75mph will require more intense/invasive work. If that is the speed you need then my advice is to go with a 250cc. Jacar Motorsports says they will have the Tank Touring 250 in sometime in April in the $2100-2200 range.

bbs.jacarmotorsports.com/viewtopic.php?t=209&sid=efb48a520817bd906a03472e25954d8a

This link should get you to the post referencing the Tank 250

[medman1952]

Thanks,
I've been told several different things about the 150, I understand the 250 is going to be a twin to the 150, and that is what I like about it, The styling. But there seems to be other options also, Evo.com has a water cooled 250 it is selling right now that they claim is built in the same factory as the tank is. do you know if this is really the same scooter or essentially so? Evo won't come out and make that claim to me, just that it is the same quality. Of course the concern that I have about this new motor is that as far as I can tell it is an untested one, am I wrong or is the same motor as is being sold on another scooter?

[fulltilt1]

Personally I think they won't come out and say it because it isn't true. Legaly that makes that statement fraud. While what they (EVO) are saying is somewhat true lots of these scooters source parts from the same vendors. I'd go to that link and get Jacar's number he was in on the prototype testing and probably has the most valid information. As for the rest of us, we haven't seen one much less ridden one.

[medman1952]

I have emailed with the guy at Jacar, his claim is that Tank took it back to the drawingboard to find the cause of a vibration from the back of the scooter, that is why it is not on the market yet. And this is also one of the things I'm concerned about in buying a spin off. Will it have a problem that I can't figure out, after spending a couple grand.Seems my best bet is to hold off until the Tank 250 comes out.

[fulltilt1]

Sounds like you're on the right trail. I'd like to have ridden one, I wonder what was causing the vibration?

[GeoB]

before I'd give advice to someone, I would want to know what their goal is! It sounded like pure speed.. but if so, he could sell his scooter, take money for these fancy heads 'n things, and buy a used 250cc of some sort maybe, huh?

Dave said:

I suggest you start at the air intake remove any air box put a direct filter right at the carb intake.

This makes more noise

Then re jet the carb

You need to address this after any mod.

Then change variator, weights or go to a racing one

At some point this fella should be asking, "And what is the down-side to these mods?"

now work on piston, cam

Does anyone know what the cam specs are? I have DeskTopDyno, a fun tool for estimating hp when you enter engine specs.

then port and polish

Judicial porting can actually raise your mpg. generally doesn't cuz folks are trying to go faster (and use more fuel). Polishing the piston, combustion chamber and exhaust is good. Polishing the intake can be too.. but be aware that on some engines you will suffer mpg loss for this.

follow with a tuned exhaust.

Look before you leap. The TYPE of tuned exhaust depends on the TYPE of after-market cam you put in. They work together. Be aware of the effects of a narrower powerband, and any change to the rpm of peak horsepower. And how would this work out with your tranny? It is designed to the hp curve of the engine.

get a tachometer.

This will be useful if you are going to do mods to your scooter.

you should approach 12000RPM's
and 80 plus miles per hour even 90MPH

And this is based on your direct observation?

GeoB

[Admin]

One thing I can tell you is that the 250cc's coming out are not GY6 based engines. Another thing I can tell you is that with new products, you aren't going to get near the level of product testing or development from Tank as you are with brands like UM or Diamo. Of course, there is quite a price difference. The 250cc scoots are really new and I think it's probably best to hold off until some bugs are worked out. I've corresponded with a couple guys that have bought them and they have had problems. I know that UM has been promising to introduce one for quite a while but they keep delaying it.

medman1952 said:

I have emailed with the guy at Jacar, his claim is that Tank took it back to the drawingboard to find the cause of a vibration from the back of the scooter, that is why it is not on the market yet. And this is also one of the things I'm concerned about in buying a spin off. Will it have a problem that I can't figure out, after spending a couple grand.Seems my best bet is to hold off until the Tank 250 comes out.

[medman1952]

Regarding the 250cc scoots, I've seen one advertised as a Baron, but it also looks like a Tank, I'm really wondering what the real difference is in these Chinese scooters. Something about this new water cooled one that has me thinking is stuff like Does it have a water pump?, How long until it starts leaking? The more complicated machines get, the more they can break, its a law of physics, if it can break it will break, eventually.

Sine the 150cc motor has some road time and it seems to be a well used design that is in many scooters, I'm wondering if I should just be happy with getting to 65 and do a carb, airfilter and exhaust modification. Other thing I'm wondering about is, has anybody ever put a taller tire on the back of one of these? That would change the gear ratio and give a higher top end.

My need for speed comes from the fact that the road I'll be traveling on will be populated with cars and pick ups that will be going 65 - 75mph, i'd just as soon not be blown off the road by them. perhaps I should just by a larger motorcycle, but they don't tend to get the fuel economy a scooter does.

The first post on this thread mentioned a four valve head, I'm going to declare my ignorance here since I have not seen anything other than the 49cc , don't laugh, F-5 Coolster I bought on ebay for my son. Are these 150cc motors a single overhead cam two valve design? If so, I'd think a four valve head would make a world of difference in the ability for this motor to breath, larger bore might not be needed.

Dawg, would you mind posting the sources you have for parts? Web page links would be great. I'd like to know where some reliable trustworthy parts places are.

[Admin]

Visit my links page for sources on parts. If you are looking for stock replacement parts, I recommend the parts for scooters site. If you are looking for performance parts, I recommend visiting the MRP site to find the parts you want, then visit my buddy Mike at www.scootertronics.com . Unfortuneately, MRP doesn't sell directly to the public. Mike can order any MRP part you want. For more places you can order MRP parts visit www.scootdawg.com/page16

[allhelmetnobike]

my opinion from some experience and lots of research.

stage 0 ==> spark plug, oil, gear lube change from factory garbage.

stage 1 ==> exhaust, air filter, carb and rollerweights. fast and easy and cost effective.

stage 2 ==> head work, cam, ignition. a little harder but worth it if you like to tinker anyway. diminishng returns starts to kick in here somewhere.

stage 3 ==> 170cc kit, clutch, high speed gears. gettting a little overboard, you have now spent a lot more on parts than on your scooter.

note on head. 2 valve head design well proven and makes good power with port job. 4 valve is pretty new and people I know were a little disappointed. my feeling is that the 4 head could be tinkered with to make some more power but maybe not that noticeable as a single item bolt-on. if someone were to send me one to take apart i could tell you a lot more, but i havn't shelled out the $250 for one yet.

note on wheels. the tng verona comes with taller wheels and has better makings for a commuter vehical. it it also water cooled i believe. mswp is like $2800 though and you can find generic GY6 based 150 on ebay for like $750 if you watch.

[motoman]

scootie said:

hi fellow gy6 users, my scooters is a zongshen t-8 which looks like the aprilia area 51. some owners of this bike told me they can run upto 75mph in stock form, how come mine can only do 58mph? BTW, theres a lot of mods here too for our engine like the 4 valvle, 170cc block, stage 2 n 3 cams, hi-comp piston, etc. what should be my 1st upgrade? i was told that our cdi is already de-restricted, is there a way to know this? ;D ;D

[motoman]

Hello all.....I really enjoy scootering and have opened up a small scooter shop in Clearwater, Fl.....our website is www.scootflorida.com.... Our business name is Universal MotorSports of Clearwater, Inc...we are a brick and motor sales, service and parts Scooter company. We are an authorized dealer for TN'G motor Scooters......Are are looking hard for additional scooter lines....one we are looking at is Zongshen.....they have a low cost entry level scooter with decent fit and finish with an MSRP of 1,119.00...as many of you know Zongshen is combining manufacturing efforts with Piaggio and Harley Davidson in China....I woul like to here from the "Asian" gentleman....is your Zongshen a 2 or 4 stroke...do you know what engine is used....how has the reliabilty been? I would also appreciate hearing from any GY6'ers who have more that 10,000 Kilometers on thier scooters.....too many people give too early prognosies with only a couple of thousand (or Less) kilometers on thier scooters....Great forum....remember Motoman.....and Universal MotorSports in sunny Clearwater Florida....come visit us...mention "Motoman" and receive 30% off on all store merchandise. "Maybe your second car should be a Motor Scooter."

[Admin]

Welcome Motoman, I think it's fair to say that Zongshen is a major player and seems to enjoy a certain level of respect in the industry. We are going to build into the forum here categories for different brands of scooters where users, manufacturers and dealers can post experience, observations, etc.

[scootie]

motoman said:

Hello all.....I really enjoy scootering and have opened up a small scooter shop in Clearwater, Fl.....our website is www.scootflorida.com.... Our business name is Universal MotorSports of Clearwater, Inc...we are a brick and motor sales, service and parts Scooter company. We are an authorized dealer for TN'G motor Scooters......Are are looking hard for additional scooter lines....one we are looking at is Zongshen.....they have a low cost entry level scooter with decent fit and finish with an MSRP of 1,119.00...as many of you know Zongshen is combining manufacturing efforts with Piaggio and Harley Davidson in China....I woul like to here from the "Asian" gentleman....is your Zongshen a 2 or 4 stroke...do you know what engine is used....how has the reliabilty been? I would also appreciate hearing from any GY6'ers who have more that 10,000 Kilometers on thier scooters.....too many people give too early prognosies with only a couple of thousand (or Less) kilometers on thier scooters....Great forum....remember Motoman.....and Universal MotorSports in sunny Clearwater Florida....come visit us...mention "Motoman" and receive 30% off on all store merchandise. "Maybe your second car should be a Motor Scooter."

hi there motoman, mine is a zhongshen t-8 that uses the 4 stroke 125 and 150 cc gy6 based engine (mine is a 150cc) . looks unique though, uses a digital cluster, front and rear disc brakes, single arm front suspension, 12 liter tank. so far reliability is fair, needs to check all nuts and bolts prior to leaving the showroom. BTW, i was told that zhongshen is one of the biggest manufacturer of scooter and some other engines in shine, sometimes it uses the brand "motorstar". try to visit out site here in manila, its www.motorcyclephilippines.com

[motoman]

Scootie....viewed website....really like the look of the PGO Gmax 150....would like to know if there is a U.S. distributor......you said reliability has been fair so far for your Zhongshen 150cc Scoot....can you share what specific issues that you had, you know, mechanicaly,electrical etc.....Thank's...MotoMan

[scootie]

i agree with you re: the gmax, looks like a smaller version of the derbi 250....... price of the gmax here is twice compared to chinese made scoots. so far, of all the t-8 users i know, it's only me whos having problem with the fuel pump....the carb sometimes encounter fuel starvation on prolong WOT, upto the point that the fuel inside the carb runs dry and needs to rest for about 10 to 15 mins. electrically, cdi and instrumentation is battery powered, so when battery is low, my cluster acts weird.

[Admin]

Scootie, have you checked to make sure you don't have a crimped fuel line of clogged filter?

[fulltiltone not signed in]

I had the same problem with my Tank Touring. Mine would do it when the fuel was about 2/3 gone. My pump wouldn't suck the fuel uphill then push it uphill to the carb. I relocated the pump lower, so that the fuel in the tank would continue to provide head pressure. It solved my problem.

[scootie]

dawg, yes all fuel lines are ok, i also did wat fultiltone did. i lowered the fuel pump, worked for awhile....the culprit is inside the pump, the 2 flaps that regulate fuel flow was flat instead of slightly angled, dealer told me this is due to normal aging, so a new pump is in order, hope this solves it, thanks again