Yamaha Zuma 50 / MBK Booster CRANK REBUILD + 70cc Cylinder Kit Install (Part 2)

www.scooterstreet.com.au
Hi Guys, We do our best to answer every Question in the comments, we will reply as soon as we can. Help us to keep producing by liking the video and support with a SUB. Much appreciated.👍
In this Part 2 video we finish the assembly of the Zuma 50 engine, installing the Malossi 70cc cylinder kit, reassembling the stator and oil pump, assembling the transmission and fitting the exhaust.

[@tyronedrury2312]

Thanks Guys, was awesome to be able to watch my engine build, can’t wait to get it back in the bike👍👌 Big shout out to Brad and his team at Scooter Street for their great service and Professional advice, keep up the good work

[@scooterstreetau]

Thanks Tyrone. Best part of the job is to build on the engine when it is out of the bike. Thanks for you support and stay in touch for an update.🙌

[@kbgaming6012]

how often should you replace the crank seals? And should you change them if you say, replace your crank?

[@scooterstreetau]

Well you can change them at any time the engine reaches 10'000kms. Or, you can change them when they fail and leak or certainly when you change the crankshaft. When we carry out a service we inspect the seals and look for misplaced or leaking around the seals at which point they would be replaced.

[@ayyvee5757]

Hi scooterstreet. Is the stock oil pump enough for a 70cc kit ? What do you recommend when not premixing ?

[@scooterstreetau]

Yes it is, ensure the oil pump is working and all of the associated parts are in good order, check it often as part of your routine maintenance.

[@dexietyy7922]

It is because it mixes at 50:1 so 100ml oil to 5L petrol in premix terms I just put a small capful of oil in my fuel tank just to be on the safe side

[@bak9451]

Love it, but would like more of the yamaha jog r

[@scooterstreetau]

No Jog R in Australia, we only have CY and CV.

[@frederikdafray9768]

When I modify an engine to perform more than the stock build,, the first thing I do is remove the oil pump and start mixing my own fuel.. I dont trust them small buggers :P Great video,, like always :P

[@scooterstreetau]

We have many customers who share the fear with oil pumps... We prefer to run them on road registered bikes, provided the system is intact. Oil pumping is something we recommend to regularly check. On race bikes we've built over the years, we have always run premix. Its just a preference thing, not worrying about the pump vs. the convenience of not having to premix. Thanks for watching🎅

[@BROKERICHGUYog]

Please do a legit tuning vid and onboard ride vid with speedo and gps video. love seeing what different builds do. Good work as usual.

[@scooterstreetau]

Yes that would be fun, this job was an engine build only, sent to us in a box from Melbourne about 2000kms away. Unfortunately we did not have the entire scooter. Thanks for comments✌

[@Karim_Belgique]

Is it possible to share a workshop manual for this engine?

[@scooterstreetau]

Google search. Yamaha_BWS_Zuma_50_2T_Service_Manual

[@teun3526]

I want to buy a 70cc mbk booster but the crank is broken I’ve done many thing but not replace a crank

[@scooterstreetau]

Watch many videos and you will be able to do it yourself. Give it a go, you will learn so much.✌️✌️

[@tjjohnston7920]

Once that happed to me It slipped out and went into the wrong location😂 It wasn't too much a pain for me😅

[@scooterstreetau]

Are you talking about scooters, always a chance.😂

[@tjjohnston7920]

@@scooterstreetau😬🤣 no this was a dirt bike.

[@YouCantSawSawdust]

That wrist pin looks way over-engineered from my experience.

[@cichysprytny3187]

What size of belt do you install?

[@scooterstreetau]

Special Belt is 16x8x751 mm 28° OR the Kevlar Belt is 16,6x8x745 mm 28°.

[@stephenbrown40]

would you find it easier to put the circlip in without the cylinder sat on top of the piston and getting in the way? Ive only ever used the piston in bore method on four strokes where its the only option due to fiddly rings. Its usually really easy to squeeze the rings together by hand on a two stroke due to the cylinder cut outs at the transfer entry. Just a thought. Loving the vids :)

[@scooterstreetau]

We did it this way for the video, we would usually fit the cylinder while engine still in frame. See our other vids, Thank you for watch and comment👍

[@rafaelcruz3319]

We’re u buying all the parts for complete the installation of tha engine ???? I ask because a got the same engine and I trying to rebuild my bike .

[@scooterstreetau]

All parts are Malossi👍👍

[@lukasmadsen4271]

Hey a little late comment what squish do you prefer on yamaha zuma i also have the malossi 70cc

[@scooterstreetau]

The Malossi kits usually sit between 1.2 and 1.6mm. adjust as required.

[@Aidod27]

Great video! I've the same engine (all stock) want to replace head & piston with a Malossi kit for street use, carb also, which Malossi kit did you guys install here? Cheers

[@scooterstreetau]

Thanks Aido, We used the 237Kit. www.scooterstreet.com.au/product/malossi-70cc-cylinder-kit-for-yamaha-zuma-50/ Best to change all of the intake parts too.

[@Aidod27]

@@scooterstreetau nice one! Sure I'll throw my engine in the post, express delivery all the way from Dublin Ireland :P thanks again, I'll check out that link 👍

[@scooterstreetau]

@@Aidod27 Cheers, Bet to buy it locally...follow the link and see the part number and then buy local.

[@calasmallorca1183]

What kind of grease is the one you packed on the oil pump?

[@scooterstreetau]

Bearing grease.

[@Millionairespiritholland]

Why a technigas exhaust and not a malossi or yasuni?

[@scooterstreetau]

Customers choice.

[@jellyking5386]

Can u please start making gilera runner rebuild tutorias!!

[@scooterstreetau]

Hi JK, I am so sorry we do not get this model in Australia😢 we have a few of the VXR 180-200.

[@landmonkey22]

Great video keep them coming 😁 Greetings from denmark

[@scooterstreetau]

🤩 Thanks brother..

[@masonhughes6710]

What grease do I need for areox oil pump area??

[@scooterstreetau]

We use a Lithium EP grease.

[@masonhughes6710]

I've just installed the stator and stator cover, how do I time it correctly?

[@scooterstreetau]

The crankshaft has a woodruff key that sets the factory timing on the flywheel and the stator has set holes for fixing the holding bolts..

[@masonhughes6710]

@@scooterstreetau okay thankyou for your help😊😊

[@scooterstreetau]

@@masonhughes6710 All good, there are 3 degree woodruff keys available if your thinking of changing the timing and then the inner rotor ignition.

[@MJermMer]

Excellent vid guys..

[@scooterstreetau]

SO happy you liked it, we really appreciate the great feedback, cheers.