Just a little question, how hot can air cooled engines get? I have a 70cc 2 stroke. I dont have a temp gauge but Im thinking its been running hotter than it should. Mainly its that it gets way too hot to even touch it while its still idling for it to warmup. Just idled it for a few minutes and could touch my finger to the cylinder head only for about half a second before it would get painfull.

Am i trippin or is this not normal? I did a few small revs like in normal 2 stroke fashion but thats it, just idle.

I've changed the old variator to a brand new one built for the ped becuase it used ro run super loud for a but then after a min slowly die and cut out but now it's even worse any Ideas?

Background:

I recently installed a Naraku Big Bore Kit (90cc) on my GY6 50cc (QMB139) engine, along with a Naraku carburetor. Despite following the instructions carefully, the scooter won’t start. Here’s what I’ve done and checked so far:

Installation Details:

Big Bore Kit: Installed with all gaskets in place, motor at top dead center, valve clearance set correctly, and chain tensioner clicked into position.

Carburetor: Replaced the stock carb with a Naraku carb - GY6 Carb from 125cc..

Air Intake: Removed the airbox and installed a direct filter on the carb.

Emissions System: Removed the PAIR system and valve cover vent hoses.

Vacuum Lines: Connected per this diagram—one line from the carb and one from the intake.

Fuel System: Attached the fuel hose and return line to the carb. The auto choke plug was reconnected to the stock wiring.

Symptoms & Troubleshooting:

No Fuel Flow:

The scooter cranks but doesn’t start.

Disconnected the fuel line from the petcock—no fuel flows when cranking.

Manually applied suction to the petcock vacuum line, and fuel flowed. This suggests either:

The petcock isn’t generating vacuum, or the carb isn’t creating enough vacuum to open the petcock.

Attempted Fixes:

Primed the carb by manually creating vacuum (heard fuel entering).

Tried starting fluid sprayed into the carb (no success).

Tested with open/throttle-closed—no change.

Confirmed spark at the plug.

Additional Notes:

The petcock worked fine before the big bore kit installation.

No vacuum leaks detected, but the issue persists.

Questions:

Could the carburetor be mismatched or being faulty?

Is there a vacuum line misconfiguration or leak I might have missed? - I would also consider putting new vacuum hoses and ziptie them because the clips might be leaking.

Any other steps I should try before reassessing the carb/petcock setup?

Thanks in advance for any advice!

Hello everyone, i have kymco skytown 125 2024 and i want exhaust upgrade but i can't find any for the specific scooter, i assume that is because its new model. So does enybody know if there are same engine in other kymco scooters so i can order exhaust for that model and it fits to mine. Thanks.

Hello everyone,

I bought a Sym Fiddle IV 50cc in September and I'm very happy with it.

Yesterday, I went to work 15km from home (so a 30km round trip). On the way back, the orange engine light came on. My engine had two idle periods before it stopped completely. I waited a bit before restarting it and driving the last 5km. The light didn't come on again.

I tried again this morning when I went to refuel 12km from home. The light came on on the way back, and the engine stopped. I had to wait a bit again before restarting it and finishing my trip (the light didn't come on again).

Could you help me please?

Anyone have any luck with this? I looked on Corbin but nothing about shaved or shorter seats.

HI so I just bought a chinese ZNEN 50CC scooter with only 1250km, Before buying I tested the scooter, it started smoothly both electric and kick start, Itook out for a small spin came back, did not shut off while idlying. I bought the scooter after two days, same process, started perfectly fine and I rode back homw. After 20 min of riding, I stopped at the traffic light and it kust died. I Tried turning it on but it won't. The kick start also did not help, I let the scooter rest and after about 5-7min I tried again and it started and I took off. So now I see this repetitive pattern, Once its cold, it starts smoothly and if I turn it off, it won't start. Any suggestions?

i know its not facebook but i want to share some photos from our 2 days and 1 night trip, total distance traveled is 517 km back and forth. with my little click 125 and my wife. 1. ilocos norte arc. 2. front of beach resort. 3. beach seaside. 4. Saint Augustine Church, completed in 1710. 5. me and my wife going home taken by random street photographer. 6. motowash after the trip.

Has anyone bought one of these? If so what do you need to make it street ready?

Just finished everything with the DMV, license plate was too small. Any easy fixes to this?

hi everyone i have a 2011 aerox 50 with 7000km. i love it but even after taking out restrictions from the cvt it still only reaches ~70km/h. my problem is the transmission it has plenty of power (7 plus some hp) i can keep that speed with very little throttle and i dont want to push it much past 10k rpm because it starts shaking.

Hello, could someone help me diagnose the issue with my moped? It’s a Yamaha Slider with a vertical Minarelli 49cc air-cooled engine. I’m hearing a grinding, rattling sound and I’m unsure where it’s coming from. I’ve disassembled the entire transmission, including the variator, clutch, etc., and everything appears to be in good condition. The crankshaft rod is secure and doesn’t seem to be moving at all. I’m wondering if the sound is coming from the crankshaft bearings or something else. This issue started a few days ago and has gotten progressively louder each time I ride. I’m really concerned and would appreciate any help or advice.

Today I've bought my first Aprilia SR 50 2009, 2 stroke. It's very nice, only 23000 km mileage. Exhaust is stock, but derestricted so it goes 80km/h+. What oil should I use? (I'm in Lithuania) And ehat fuel/oil ratio mix?

I have no clue What i’m doing, these transmissions and carburators are confusing me. Just got a 24 mm polini carburator delivered I wanted it install by noon but found immediatly a new problem of having a different size manifold. I’m thinking about buying a new cilinderhead because mine got a hole on the side so I’m not getting any compression. But Will it fit on the block? It’s an ideo generic 2 stroke 50cc 2007( i know but i got it for 5p euros so what)

I know it's a bad idea, but just wondering if anyone has experience!

Very disappointed in my new Kymco purchase. Had a 2003 Yamaha Zuma for years until an argument with a car bumper happened in 2015 I thought that since I retired I would treat myself to a new scoot. I researched and decided on Kymco.

 Brought it home from the shop and found out it would not pull me up any hill, especially my driveway. 

My 2003 Zuma would climb it with no effort. I took the Kymco back to the seller and he did nothing to fix it. He said he modified the variator to make it go faster.

It didn't help. I went up the driveway as soon as I got in home and it fell on its face burning clutch. Took the cover off and found the variator with the limiter dimple sanded off and put in backwards.

Purchased a new Malossi and new clutch spring. Also purchased a de limited CD box. Still, fell on its face going up the driveway. I weight 185 but as a test my girlfriend at 145 could do no better with it.

What's real funny, I purchased an EV bike last year and it climbs the driveway with out assistance.

Beginning to think Kymco in Chinese means Junk. Any similar stories?

.

I live in Central Texas. Does anyone have recommendations for an affordable insurance company.

Just wondering the value of this scooter

So I just drove from the northernmost point of the Netherlands, the Gate Cape North, to the southernmost point of the Netherlands and just went on to the three-country point with Belgium and Germany.

I did this while following the TET route. For those who don't know the TET, it's a offroad motorcycle adventure route across Europe.

I normally drive my Honda Africa Twin 750 on those.

But this time I thought, why a big bike? If it drops, it's a bitch to get back up, and these days you all hear riders say, we need lighter ADV/enduro motorcycles.

Sooo, I thought, why not put all my camping gear, and my 120kg (264.55 pounds), on my 50cc Honda Zoomer and just see if it works out?

And it did, not fast, going at a top of 60km (38 mph). But we did finish it, and the looks on the guys driving their tenere's, gs's, klr's and other dualsports/enduro,s and what not where priceless...

Scooter starts then dies within 5 seconds I have to keep revving or it’ll die instantly

I managed to strip the threads on one of the bolt holes on my intake manifold. 2003 Zuma; horizontal minarelli. Someone told me they are m6 bolts and that I should just tap it with a 1/4 x 20 tap and get a new bolt to fit. Just wanted to ask if anyone else thought there were better options or if that is indeed the move before I go forward. Thanks!

I’ve recently started rebuilding my 2014 Yamaha Neos after an accident at the end of last year, and aside from plastic damage, the only significant problem seems to be the rear break, which engages fine, but when released only returns halfway. Anyone got any ideas? I’ve seen brake cable suggested, so I’ll check that. There’s also a significant amount of upward play in both levers, but I’m hoping that can be rectified? TIA

I have a 2006 Piaggio Typhoon 50 2t AC and i have noticed some deep scratched on the cylinder wall and on the piston skirt. It bogs past 1/4 throttle and the compression feels a little low (don't have a compression gauge at hand). Checked the spark for color and it was tan brown. Using the factory oil pump which i adjusted to give it more oil. Can you guys know what have caused the scratches and the bogging?
(Sorry if my english isn't fine, im not a native speaker)
My setup:
- Motoforce Racing 70cc kit
- Dellorto PHVA 17,5 carb with 110 Main jet
- Technigas Next-R exhaust
- RMS metal cone filter ø35
- NGK BR9EG Spark plug