Yamaha vino 50cc 2t exhaust

[luke0000]

What size jet would you recommend for the upgrades ? I bought a kit that has 80-102

Also the variator kit I bought came with a red clutch/contra spring? Do you think it is to stiff?
Tanks

[bigmatthew86]

All brand of jets are different so I can’t tell you there. Pretty sure I’m running a stock Zuma jet in my vino (80) I think. Although the 80 you got could be larger or smaller. If you don’t have a temp gauge you should get one. They are cheap & make tuning way easier. If the red springs you got are the stiffest they are too much. I think I’m running a white contra & the softest of my 3 pack of springs (+500) I think.

[Zino]

I ran a white contra or fresh stock contra in my vinos
The red is for way more powerful build
that should be a wide enough range of jets
a temp gauge is a must have for tuning and long term protection of your hard work .

[luke0000]

Do you mind explaining what the temp gauge is used for ?

And what kinda gas do yall run in yo scooter 91?

[aeroxbud]

The temperature gauge has a ring which replaces the crush washer on the spark plug. This enables you to monitor how hot, rich or lean the engine is.

[Zino]

I run non ethanol regular pump gas 87 or 89 octane

[luke0000]

Ok so I got the temp gauge. Should I put it on the head bolts or do I have to put it on the spark plug. The spark plug would take a lot of work as I would have to notch out a fin. Sorry for all the questions I really appreciate your help.

[Zino]

Spark plug works best.

[luke0000]

Ok so I took off the cylinder head and noticed this micro crack?(attached images) Do you think it's ok or do I need to replace the crank or somethhing. if thats the case im not sure if I have enough knowledge to do so lol

[oldgeek]

I don't think that is a crack, likely just where they trimmed the casting a bit. Check to see if there is a crack on the inside where the wrist pin bearing rides.

[luke0000]

I think you’re right on the inside there is no cracks at all inside

[oldgeek]

Jan 11, 2024 17:16:27 GMT -5 luke0000 said:

I think you’re right on the inside there is no cracks at all inside

Why did you pull the cylinder?

[luke0000]

The scooter had trouble starting but would run when engine was hot, had blow by and was eating oil. I was planning on upgrading the cylinder eventually so opened er up

[luke0000]

Alright so I installed the big bore kit and installed new main jet and it now when I attempt to start it sounds like it has compression but then there would be a clicking sort of noise in the cvt area so I would stop. I checked compression and I have about 110psi. Not sure where to start I’m a little discouraged

Thanks a bunch

[Zino]

do you have the ground for the kick start under neath the screw

try kick starting it
it may just be to much to turn over by the battery

My vino batteries have a hard time turning over with a kit .