Jog CV50R 70cc Polini BBK Install

[tsimi]

Found out something shocking! Will update later....

[tsimi]

Lucass2T

So back home....
You made me very curious regarding this 5BM engine so I went and looked at my 2 Jogs that I have.
I have a red Jog with BBK and a silver Jog stock setup.
Now here are Images of the engine types.

Red Jog


Silver stock Jog


I always wondered why the silver Jog was faster and stronger from the takeoff then the red one when I didn't had the BBK on it yet. Now I know the answer 5BM is the difference.
So in short I put the BBK on the wrong engine!

You wanna tell me that all 5BM engines are trenched/ported like oldgeeks images? The reed valves are also angled like that?

I went to the local bike shop guy and had a chat about that engine. Here in Japan you can order the casings brand new. They are still available in large quantities. Official Selling Price is;

Crank case (product code: 5BM-15110-10) (large pieces) 24192 Yen (approx. 181 Euro / 202 USDollar)
Crank case (product code: 5BM-15120-01) (stator side) 11988 Yen (approx. 89 Euro / 100 USDollar)

I don't know how much the shipping to Europe is though. You can also get many Yamaha engine used on the yahoo auction platform there you can get complete engines for $60 up to $250 bucks.

So now I am thinking of swapping the engines.
Luckily I ordered a complete gasket set for the Polini BBK when I ordered it at scootertuning.ca
If I would wanna swap the whole cylinder, piston and head what else needs to be replaced?
Needle bearing? Circlips to hold the piston pin in place?

[Lucass2T]

A 5SU engine???
Really curious if they are the same as the 5BM.
But yeah the 5BM should be as in oldgeeks photos.

[tsimi]

I don't think that the 5SU engine is same. I took the reeds out of that once and they were straight not angled.

[tsimi]

On my way to work this morning I came past a bike shop. They have a tiny scrap yard with many old broken down scooters which seems they use as spare parts or stock yard before they going to be crushed.
Anyway when I was driving by I spotted this here and I wanted to take a closer look at it because who knows it might be a 5BM case...?


Yes! It is a 5BM case. Holy what a coincidence.


At lunch I'm gonna go talk and see what he wants for it. There is gears missing and crank case cover but I think all those things you can find later or swap from the current Scooter.
So either I am just really lucky or you indeed can find many of those 5BM cases over here.

[tsimi]

An update on the 5BM engine... I went and had a chat with the bike shop guy and I asked him.
Me: "What is gonna happen to those scrap scooters out there?"
He: "They are for spare parts and the ones that are more or less in one piece go to foreign countries. And the rest gets crushed."
Me: "If you would sell an engine from there how much would you sell it for?"
He: "Which engine are you talking about? Show me...."
*walking to the scrappy scooters*
Me: "This one, the Jog one."
He: "I can't give you the frame because of the serial number but the rest below you can have."
Me: "How much you want for it?"
He: "If you removed it yourself it's yours."
Me: "What you mean? For free?"
He: "Yeah, sure. I can't sell this stuff anyway just take what you need."



I will go pick up that engine tomorrow or the day after. Yes! For F.R.E.E.! 5BM baby!
Man I am so lucky with this whole scooter stuff. First I get a complete set of panels for free now an engine. Man I hope my luck won't run out anytime soon.

[ceeja]

im moving to russia

[Lucass2T]

You lucky mother
Congrats man hehe. A free 5bm engine, nice!

[tsimi]

Engine thread opened here.

49ccscoot.proboards.com/thread/13871/5bm-engine