predator ghost 212 with mikuni carb vm series and 9k rpm

[Driftx97]

so ive got a pedator 212 ghost with a upgraded flywheel and stock coil and mikuni carp but im having problems with getting it to run right i can get it to idle most of the time but my plugs are black and black smoke along with if i punch it, it will just die out if i punch it to hard. but if i turn idle down at all it take about 20 pulls with some gas or spray. and wot itll cut out. and i dont know what to do 100% and dont want to just go messing with it to make it worse and suggestions on what to look at or what to do

 

[Hellion]

Black spark plugs typically mean “too rich” so it is getting more fuel than it can burn. There’s a spark plug chart where you can read your sparkplug(s) to diagnose engine issues. You should be able to find one in cyberspace.

and mikuni carp

Show us the Mikuni Carp!


Welcome to DIYGK.

 

[Grizzlymi]

Carp vs. Mikuni

 

[Hellion]

Which Mikuni carburetor? It has to match the engine, more or less, or it could be like having a Holley 1150cfm 4-barrel on a 50cc scooter motor.

Edited to add: Too much carburetor for the engine size

 

[Grizzlymi]

And Driftx97, we all bust each others balls around here. We know you meant carb, just having fun.

 

[Whitetrashrocker]

Even in cars, everyone over sizes the carbs.
This leads to lazy airflow and poor fuel atomization.
A smaller bore will actually work better up to a point.

The larger bore carb will also come with larger jets.

I agree your running rich. Black smoke, black plugs, and bogs when given throttle.

You can adjust the idle mixture screw to see where you stand.
Start with it about 2.5 turns from seated.
Start the engine and let it warm up.
Slowly adjust the mixture screw. 1/4 turn at a time and let the engine respond.
If the rpm goes up, the engine liked it. Go another 1/4 turn. Repeat till the rpm starts to drop off again. You sometimes will have to adjust the idle stop screw to drop the rpms.

If you run out of mixture screw and still haven't got the mixture right then your jets are wrong and will need to be changed.

Once you get the idle mix right then you can work on the main jets.

The ghost has a 22mm intake valve.
Therefore a 22mm carb would be the properly sized one for that engine.

What size do you have and what jet sizes are in it?

 

[Whitetrashrocker]

Heres a decent video explaining tuning.

 

[Edwin Spangler]

Did you change the coil when you changed the flywheel?

-Or did you buy the upgraded flywheel FOR the ghost, specifically?

If both of those are "NO" then thats your problem.

I also had to change to the sheet metal head gaskets as the "fire ring" type kept blowing out after I swapped the flywheel and springs.

EDIT: Does it also try to rip your arm off?

 

[Hellion]

Dumb question but isn’t the Ghost ‘ready to go’ with a 10K rpm rated flywheel and all the good bits?
Why even switch out the carb?

Oh that’s right, WTR’s first statement, line one, post #6.

 

[Edwin Spangler]

Dumb question but isn’t the Ghost ‘ready to go’ with a 10K rpm rated flywheel and all the good bits?
Why even switch out the carb?

Oh that’s right, WTR’s first statement, line one, post #6.

Comes with stock 212 flywheel and does come with Mikuni.

The rev limited coil (6k) needs to be changed if you swap the flywheel. Timing wont match.

 

[Hellion]

Comes with stock 212 flywheel…

With the plastic cooling fins and the “projectile” magnet? That’s gay, bro.

 

[Edwin Spangler]

With the plastic cooling fins and the “projectile” magnet? That’s gay, bro.

Yeeap! -I was wrong also. The coil limits the RPM to 5k...

 

[Wicked_Daddy]

The issue is the coil. You need a non-ghost coil. The ghost coil does not work with an upgraded flywheel. The rev limiter in it is not compatible with the timing of non-ghost flywheels. Just put a regular coil on it and the problem will be solved.

Then you can tackle tuning the carb.

 

[Whitetrashrocker]

The issue is the coil. You need a non-ghost coil. The ghost coil does not work with an upgraded flywheel. The rev limiter in it is not compatible with the timing of non-ghost flywheels. Just put a regular coil on it and the problem will be solved.

Then you can tackle tuning the carb.

Another reason I dont like the ghost.

Made for box stock class racing.

You can buy a new 212 and all the stuff to build an engine that will out perform a ghost for the same price if not a tad cheaper.

 

[Hellion]

I don’t like the Ghost either, especially after reading up.

You can buy a new 212...

Right. There's still time to ditch that overpriced wunder-engine and get a base model 212cc. Use the money from selling the Ghost and build up a Rotaderp 212cc. More fun that way.

 

[Driftx97]

i mean iv got no problem hitting 9250 rps. and a brand new ghost came with the kert and tomorrow i will double check witch carb

 

[Edwin Spangler]

i mean iv got no problem hitting 9250 rps. and a brand new ghost came with the kert and tomorrow i will double check witch carb

Dont worry about the carb until you swap the coil. https://www.amazon.com/Ignition-Chi...8f-a110-355d7654ffcb&pd_rd_i=B08DHPV8DZ&psc=1

I think whatever youre using to measure RPM is inaccurate. I have a hopped up ghost 212 on a light minibike that has a hard time hitting 8... Actually, Ive never crossed the 8k line yet. Add that to the fact that you said it has the stock coil which limits your RPM to 5k.

 

[Edwin Spangler]

You can buy a new 212 and all the stuff to build an engine that will out perform a ghost for the same price if not a tad cheaper.

Can someone who knows the parts better than me figure this, please? I did a comparison a while back and my price came out to be about the same.

 

[Wicked_Daddy]

I did a full analysis of the ghost cost vs building a 212 from a base Predator. I ended up buying a base Ducar because the ghost is built on the same block - at least that is what all the information pointed to. I spent more building that than just buying a ghost and leaving the ghost as is. But I would have spent even more improving the ghost with a flywheel, coil, rod, rockers, and then there is the $200 kit you have to buy from HF to complete the ghost anyway. You will be into the ghost for $550 before you take it out of the box.

You can get the 212 for $110. Buy a kit from RacersProQuip on Ebay for between $150 to $250 that will have flywheel, cam, rod, piston and etc and a Nibbi carb kit on Amazon between $70-$100 and build a beast for around $460 or a bit more once you add exhaust and maybe a rocker kit to support the RPMs.

So why not just start with a base engine and build it? Depending on how far you want to go on engine and upgrades, the result would be a near bulletproof screamer that will make your heart swell every time you start it up. As they say... priceless!