Anyone with 212cc Predator on a Shift Kit?

[5-7HEAVEN]

I installed the 7-speed chain to the 24t chainring sprocket.....
and it rubs on the edge of the 83-tooth timing pulley.

Normal chainring sprockets are less than 1/8" wide.
The 83t pulley is an inch wide.

I'm using the 83t cog as a chainring sprocket, which belts onto a 17t jackshaft sprocket.

Solutions could be to move the 24t further inward.....
or space the 83t pulley further outward.....
or both.
I may have to reverse the sprockets and have the 83t pulley on the inside,
and the 24t outside of the bottom bracket.

Last resort is to replace the 83t/17t pulleys with 36t/10t chain sprockets and a 16t clutch.

 

[Chainlube]

Got any pictures, I'm having a hard time trying to figure out what you're doing.

 

[5-7HEAVEN]

Ok. Pictures later today

 

[5-7HEAVEN]

Funny how one change leads to another.

Working on my pull start make me curious enough to inspect the flywheel..
People say they're prone to explosiveness at high speed.

So I removed the stock flywheel and ordered a billet aluminum one.
Now my idea of a governed engine changes to an ungoverned one and more rpm.

Out comes the governor.

The hole from the governor's lever will be tapped for a brass nipple. It'll allow the crankcase to breathe into the valve cover.

I'll keep stock valve springs, which should limit rpms to 5,000rpm.

Perfect.

 

[Chainlube]

Did you get the billet flywheel with the advance built in to it? That's what I have on my cart, 8 degrees advance. Gov out, stronger valve springs and a 6500 rpm cam.

 

[5-7HEAVEN]

Yes, built in advance.
Im leaning towards 18lb. valve springs.
Stock cam.

 

[5-7HEAVEN]

Things change.

Instead of using a jackshaft for a shift kit,
I'm belting the 23t pulley clutch directly to a 150t cog sprocket.

No jackshaft necessary.
Direct hook up from clutch to the bottom(BB) shaft.

The hub for the 150t gear will be welded directly onto a 1" hollow BB spindle.

I haven't secured the motor mount to the midframe yet.

The horizontal mount lies parallel to the ground, and
almost directly above the BB shaft.

The 5mm timing belt that I need ONLY comes in lengths of 7", 8.25" and 10.5".

If the engine shaft is less than, but close to 7" away from the BB shaft,
I can use the 7" belt without need for a tensioner.

If the distance is a bit more than 7",
then I'll need to use the 8.25" belt WITH a tensioner.

If the distance between shafts is less than, but close to 8.25" from each other,
I can use the 8.25" belt without a tensioner.

Since the engine mount is horizontal,
I can shim the motor mounts to stretch the belt for a tighter fit.

 

[5-7HEAVEN]

Without a jackshaft, gear ratios for a 7-speed bike will be higher,
especially in the last 3 gears.

Using a 34t-14t freewheel, First gear will be 9.24:1, and
Fourth gear to be 5.43:1.

Should be good enough for the flat roads and steep hills.

Crossing fingers.

 

[5-7HEAVEN]

Yes, built in advance.
Im leaning towards 18lb. valve springs.
Stock cam.

Things changed.

I installed the billet flywheel and 18lb. springs.

When I installed an electric starter on this Lifan 212cc engine,
I had to remove the billet one and install a flywheel with starter gear teeth.

They do have a $200 billet starter flywheel.

However, you can't use the battery charging coil with it.

So, I'll run the cast iron OEM flywheel with starter gear and charging coil.

I could PROBABLY get by without a charging coil installed,

but I don't want to spend $200+ on the billet flywheel

It should be ok.

I'm not revving past 5,000rpm anyways.

 

[Chainlube]

Things changed.

I installed the billet flywheel and 18lb. springs.

When I installed an electric starter on this Lifan 212cc engine,
I had to remove the billet one and install a flywheel with starter gear teeth.

They do have a $200 billet starter flywheel.

However, you can't use the battery charging coil with it.

So, I'll run the cast iron OEM flywheel with starter gear and charging coil.

I could PROBABLY get by without a charging coil installed,

but I don't want to spend $200+ on the billet flywheel

It should be ok.

I'm not revving past 5,000rpm anyways.

I see some of the guys in carts running them up to 6500 without any issues.

5000 is still pretty quick on a bicycle.