170cc BBK install QMJ157

[Wideopen]

Greetings "dawgs" new to the site like the layout.

I've got an 2012 Chinese 150cc sunny sport scooter just got all the bugs worked out of it a few months ago has 5k. I want alittle more power out of it. here is a list of the mods I already have

UNI foam filter
115/40 main jet,pilot jet
YMS V8 no baffle stainless exhaust
ZHEN type 2 variator, Dr.pully 12gram sliders
fancy chrome CVT cover

The 170 BBk is still in the mail it comes with the whole top-end along with an high lift A9 camshaft 94$ Ebay.
It's snowing outside figured now is the best time to tear it on down, I'm not going to remove the engine, pulled some plastics off under the front of the seat I have plenty of room there.
I did the same on my neighbors QMB-139 the other day he bought a 50-100cc BBK of Ebay for 54$ shipped! it came with everything as well, and some. Took no time to install 2hrs at most, this QMJ-157 should be a piece of cake as long as I don't have to bore the cases.

Can someone please show me how to post pics in posts.

[Guest_3]

Wideopen, Welcome to SD. :cheers:

Can someone please show me how to post pics in posts. As for posting pics, You need to host them somewheres or ...

Use the paper clip attachment icon http://www.mricons.com/store/png/116757_34235_64_attachment_black_paperclip_icon.pn g and post them from your computer.

[Wideopen]

Wideopen, Welcome to SD. :cheers:

As for posting pics, You need to host them somewheres or ...

Use the paper clip attachment icon http://www.mricons.com/store/png/116757_34235_64_attachment_black_paperclip_icon.pn g and post them from your computer.

Thanks!

[Wideopen]

Torn down, I have been using 10w-40 mobil 1 oil full synthetic I need to use SAE oil for the rings to breakin. Is it ok to go back to conventional oil after you been using full synthetic?

[Guest_3]

I need to use SAE oil for the rings to breakin. Is it ok to go back to conventional oil after you been using full synthetic? Yes. :nod: . I haven't had any problems switching back & forth

Now I only use Rotella-T 15-40w.

[Wideopen]

Turns out I had to have the cases milled, took the engine out and disassembled to bare castings. Block is now at the machine shop being bored by a professional didn't want to screw it up with a my lack of tools. milling should be done by tomorrow, than wait for the gasket set in the mail from partsforscooters.com

[Frank Castle]

i thought there were no upgrades for the 150cc scoots without changing the body?

[James2132]

So how did they upgrade go?? I'm Tryna install a ncy 61mm bolt on kit. What's your top speeed

[skuttadawg]

I was at my scooter dealers shop and he put on a 63mm BBK without having to bore out the case like most need . I think he said it had ether the GY6 B or your engine as they have a thicker block he said . Since you have it apart and if you have the cabbage I would replace the stock crank as the bearings are weak for a BBK or even a stroker crank . Walter has everything you could ever need for a 150 as that is all he sells parts for http://www.scooterelements.ecrater.com/c/135066680/engine?&srn=2