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Motorcycle engine - parts
RMMotor PY 50 4T - Page 2

Manufacturer

Price

    EUR

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Found: 167
Shaft seal 18.9x28x5 4T - 73852 Shaft seal 18.9x28x5 4T - 73852
72cc cylinder head gaskets - 73844
Starter shaft seal 13.7x24x5 154FMI - 73849 Starter shaft seal 13.7x24x5 154FMI - 73849
4T 139FMB cylinder head bolts set - 73835
4T 139FMB engine bolts set - 73837
139FMB Engine Retaining Bushings - 73840 139FMB Engine Retaining Bushings - 73840
Clutch engagement kit screw - 73820 Clutch engagement kit screw - 73820
Clutch Adjustment Bolt 4T 139FMB - 73830
Starter chain guide set 139FMB 4T - 73817 Starter chain guide set 139FMB 4T - 73817
50cc engine complete - 73812 50cc engine complete - 73812

€401.33

delivery 0 €

50cc engine complete - 73812

Oil pump 4T 139FMB - 73807 Oil pump 4T 139FMB - 73807

€5.12

Oil pump 4T 139FMB - 73807

stars    (7)
154FMI Shaft Seal Cover - 73806 154FMI Shaft Seal Cover - 73806
Left engine cover, magneto, 2 coils - 73803 Left engine cover, magneto, 2 coils - 73803
Piston rings 60cc 4T - 73799
Exhaust stud nut 4T 139FMB 2 pcs. - 73795
Piston rings 72cc 4T 139FMB - 73800
Cylinder pin nut and washer 4 pcs - 73797 Cylinder pin nut and washer 4 pcs - 73797
Piston rings 50cc 4T FMB - 73798
Complete cylinder 72cc 139FMB 4T - 73784 Complete cylinder 72cc 139FMB 4T - 73784
Gear shift sensor 4T 139FMB 154FMI - 63893 Gear shift sensor 4T 139FMB 154FMI - 63893
139FMB 50cc engine gasket set - 63484
Gearbox needle bearing HK 13.5 4T - 59047 Gearbox needle bearing HK 13.5 4T - 59047
Crankshaft 4T 139FMB - 59345 Crankshaft 4T 139FMB - 59345

€19.26

Crankshaft 4T 139FMB - 59345

stars    (10)
Intake and exhaust valve 70cc 4T - 59069 Intake and exhaust valve 70cc 4T - 59069
Cylinder pin set 4 pcs 4T - 58986 Cylinder pin set 4 pcs 4T - 58986
Valve seal 2 pcs 4T 139FMB 154FMI - 59064
4T 139FMB Clutch Assembly Kit - 59025 4T 139FMB Clutch Assembly Kit - 59025

Browse by manufacturer

Products reviews

2020-09-07, 08:47

poland

Krystian

Hello I own a junak 901 with a capacity of 50/70cmm from new purchased in 2011 to date Junak has traveled nearly 17 thousand km What I really like about the moped is the simplicity of the whole motorcycle, there is nothing complicated in the repair process, simple design, availability of parts is huge and easy to obtain. This is the second repair of the engine since new due to the fact that I ride a lot, parts wear out, now I have overhauled the engine again and the motor fires up from a shot, the larger gear ratio gears allowed to run longer in gear and achieve better results speed in km ends as soon as the pointer passes 80 I like to test various products with them especially carburetors and filters to get better results in combustion and on power of course it is possible but several carburetors of different manufacturers of fuel nozzles you need to have to get such an effect . Parts from gmoto I buy because it is a proven seller of parts and really parts are of very good quality than on other sites only now what I bought starter chain sliders significantly differ from the original I would say more that the quality and material are other weaker but for everything there is a way site I recommend to all lovers of unicycles

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2019-10-13, 21:34

poland

Szymon

I installed in a 2010 Barton Fighter moped. After mounting the moped clearly came alive, it became very sprightly, the top speed also increased. After starting from first gear it can sweep the wheel, and after releasing the clutch faster it stands on the wheel, also when shifting to second gear the front end likes to lift gently. Overall, for this price I can confidently recommend this cylinder to everyone. I recommend 100%

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2019-10-18, 13:05

poland

Zbigniew

I have a Junak 901,I bought this kit because the motorcycle was already quite weak. I did the assembly for the first time, and it took me some time. So far I'm lapping , and I have no problem. I think Moretti products , are good parts and recommend.

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2019-11-03, 07:53

poland

RAFAŁ

I bought the shaft from Gmmoto I put it on the engine Everything fits Engine runs like gold The shaft is well made and brewed, nothing beats, no knocking, no rubbing .ENGINE AS NEW I RECOMMEND

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2021-07-22, 06:27

poland

Szymon

Recommended website fast shipping all forms of payment with quality I'm satisfied with the cylinder everything laughs as it should so I recommend!

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2019-01-08, 14:20

poland

Monika

Timing chain tensioner kpl 4 t139 fmb very good class very well made with attention to detail fits without any problem I recommend to everyone

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2019-03-26, 17:22

poland

Monika

Cylinder pin nuts and washers fmb139 super quality with attention to detail made of high quality materials I recommend to everyone

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2020-09-07, 08:50

poland

Krystian

The screw does not differ from the original and was sold with the washer included where else you have to buy the washer separately I recommend the product

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2019-01-08, 08:25

poland

Monika

4t 139 fmb ball bearing take-off shaft very well made with attention to detail fits without any problem recommend to everyone

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2019-01-08, 08:32

poland

Monika

Shaft seal18.9x30x5 4T 139 fmb very well made with attention to detail fits without any problem I recommend to everyone

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2019-01-08, 07:22

poland

Monika

Set of engine gaskets139 fmb 50cm3 very well made with attention to detail fit without any problem I recommend

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2020-09-07, 08:58

poland

Krystian

Installation went without a problem threads not damaged the shipment itself also not damaged I recommend the product

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2016-03-08, 22:01

poland

Łukasz

i have a 2007 kingway 50 chopper I bought new starter chain sliders because the old ones were already very worn and while driving I could hear knocking after installing the new sliders the problem disappeared sliders fit perfectly in their place and not as I bought in another store nothing fit here, however, everything fit perfectly I am very pleased with them and I recommend them to anyone who wants to buy them.

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2018-04-16, 07:02

poland

Damian

barton rangger classic poj.50ccm vintage 2017 fitting gaskets very well made they fit very well and even perfectly made of good material they do not break like others they hold elegantly there was no problem with fitting with you products that I order always fit there was no part that did not fit as from others that I bought were fit to be returned

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2017-07-28, 16:56

poland

Michał

GB Motors Street 72ccm The product fit my head perfectly, you can say that it was so good that it fitted by itself :D Namely, it does not leak, everything plays as it should, after firing the motorcycle the old power returned and the pressure did not escape through the valves. I recommend the product as much as possible as well as the store, of course. He buys here all the parts he needs, because all are always here :)

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2021-06-26, 18:09

poland

Paweł

Barton Fighter BTS 50. parts of very good quality. Delivery within two days. Quick installation and the motorcycle rides like new. I honestly highly recommend ordering parts from this store. I have personally ordered different things several times already and each time I was satisfied. And whenever I need anything I will only order here. Proven and worth the purchase. Regards.

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2025-05-14, 07:16

poland

Roger

Very simple ordering mechanism. This is the second time I have ordered this oil seal. The quality is convincing. The price/performance ratio is very good. I can only recommend this item. Intended use: Left crankshaft oil seal. Motorcycle: Ohvale GP-2 190 cc, Mini GP bike, year 2024

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2020-08-25, 22:22

poland

Kamil

I have a Zipp pro 50cc motorcycle from 2012 I ordered a starter shaft sealer and Motul 10w-40 semi-synthetic oil as for the sealer is very well made and thanks to this it can be installed quickly and without problems, oil clean and fragrant so you can confidently pour oil into the engine and enjoy the ride.

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2023-08-07, 16:19

poland

Ireneusz

Very good build quality. The head with larger valves to this plus the replacement of the main nozzle in the carburetor gives incredible power. And if you replace the gearbox with more teeth in the engine it flies like a storm. 2 times faster and much more powerful. I sincerely recommend. I have taken a lot from this store and everything great.

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2016-07-30, 20:11

poland

Piotr

The product was purchased for zipp shocka motorcycle . Since the installation of the product which is in the picture the chain is tightened correctly and the parts made of very good material and not as I ordered from allegro it came from a week and the spring broke . I recommend shopping here :)

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2018-12-02, 14:38

poland

Gracjan

Barton FR 50 2014. The pawl really does its job very well, the gears do not fall out or jump. the product is made very aesthetically pleasing and is very easy to install. I am very satisfied with this purchase, I recommend to other customers greetings warmly.

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2017-04-16, 15:05

poland

Mateusz

Ogar 900 '08 Compared to the gaskets once purchased from another site, these seem to be much better in terms of the material itself as well as the fit. However, the gasket between the crankcases seems to have to be cut out everywhere to put the cylinder on later.

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2025-06-06, 15:34

poland

Tadeáš

the cylinder itself is great and the piston all the seals and piston rings . it's supposed to be a plug and go cylinder . NOT I have a jawu betka/kentoya twinshot and need to buy a new head because the original camshaft is not enough and need to adjust the valve .

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2019-06-07, 08:31

poland

Łukasz

The cylinder fits perfectly to the engine 139FMB, the moped after such tuning laughs beyond recognition, I wanted to emphasize that I did not replace the gasser, it is the original from the fifty, only the nozzle replaced with a larger + head and everything runs perfectly.

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2024-10-03, 03:39

poland

Cezary

This kit is very useful for overhauling FMB139 and related engines . Finally I have new screws, and do not have to look for anything . All that were scratched or machined I replaced with new ones . Now it is completely different . :D

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2023-12-31, 11:05

poland

Robert

As the only product I have a negative opinion because the quality of the thread in the nuts purchased was tragic both in terms of its appearance and the internal diameter on which the thread was made . I did not install them on the motorcycle .

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Gmoto's reply If you are not satisfied with the quality of workmanship of the purchased item, simply submit a complaint request on the store's website.
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Reliable opinion

2025-03-08, 14:19

poland

Roger

Simple ordering process. The parts at a really fair price. Shipping costs fully ok. The parts exactly according to description and photos. I am very satisfied, many thanks for everything. Can only recommend the supplier.

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2018-06-04, 20:32

poland

Marcin

Junak 901 2014. Cylinder of good quality, fits perfectly to the engine 139FMB, the aesthetics of workmanship I can rate very good. All gaskets fit, there are no free spaces between the cylinder and the crankcase. I recommend

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2016-03-08, 22:01

poland

Łukasz

i have a 2007 kingway 50 chopper timing chain tensioner made of very good quality materials all parts fit together perfectly everything works as expected I have no reservations recommend !!!

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2025-05-13, 17:18

poland

Stéphane

Hello, The crankshaft seems to be well made, to be seen in use. Packaging a little short, the connecting rod head was sticking out of the box. No apparent damage. Gmoto, a responsive team, fast delivery. Would recommend.

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2022-01-16, 13:02

poland

Krzysztof

Barton Ranger 120CC, the bushing fits, of course. The oil bushing comes in a kpl. with a gasket-oring. I am very satisfied with the packaging of goods at Gmoto, I order a lot of small parts and not once was there a mistake :=)

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2025-05-13, 18:07

poland

Stéphane

Hello, The sensor seems to conform to the original. It is delivered with the mounting kit (plate and flange) and the O-ring is mounted on the sensor. Gmoto, a responsive team and fast delivery. I recommend Gmoto.

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2025-05-06, 05:01

poland

Ulrich

The quality makes a very good impression. The look and fit are the same as the original part I replaced with it. Shipping was very fast, everything I ordered was securely packed.

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2025-05-06, 05:00

poland

Ulrich

The quality makes a very good impression. The look and fit are the same as the original part I replaced with it. Shipping was very fast, everything I ordered was securely packed.

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2018-09-16, 12:03

poland

Arkadiusz

Junak 901F 50cm3 capacityride it sensationally,and the products purchased from you emphasize the specific haracteristics of the motorcycle and increase its visual appearance from elegant to mega effectively nice

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2018-03-23, 20:07

poland

Dawid

Hello everyone I own a Zipp pro 50 moped I ordered a 72cc cylinder head gasket, it was a perfect fit and went around without any modifications. I rate the product as very good.

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2017-09-24, 22:35

poland

Michał

The clutch tappet simmerring could enter the socket with a little more resistance. Completely smooth on the outside wall makes it easy for it to fall out when the clutch is manipulated more sharply.

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2021-04-14, 08:21

poland

Bartosz

Screws I bought for Zipp Pro 50/110 with 139 fmb engine after unpacking I started to screw the engine with them. The screws screw in easily there was not a single one missing from the set I even got one with a surplus. I recommend.

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2021-04-14, 08:21

poland

Bartosz

Screws I bought for Zipp Pro 50/110 with 139 fmb engine after unpacking I started to screw the engine with them. The screws screw in easily there was not a single one missing from the set I even got one with a surplus. I recommend.

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2019-03-12, 02:07

poland

Szymon

ROMET OGAR 202 FITS perfectly but I recommend changing the side bearings of the shaft to koyo to make it last longer the bearing numbers are 6204 both greetings and recommend for 80 zl it is a really good shaft because Moretti :D

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