Predator 212 hemi Mini bike build

Possom point

Possom point

Active Member
#1
#1
Hello everyone, I am in the process of upgrading my Predator 212 motor for a Murray Track 2 mini bike.

My current parts are: 22 mm Mikuni carb w/ jets, 26 lbs valve springs, Isky Black
Mamba Cam, Hi flow air filter and a torque converter.

I am planning on removing the governor.......

Will the current parts I have wok without doing any machine work????
(as in shaving the head)

just wanted to do bolt on mods
 
ole4

ole4

#2
#2
You need a billet rod and flywheel. Need a good exhaust as well. With those mods if setup correctly it will surprise you.
 
Possom point

Possom point

Active Member
#3
#3
ole4 said:
You need a billet rod and flywheel. Need a good exhaust as well. With those mods if setup correctly it will surprise you.
Click to expand...

ok good deal, as far as the rod..... any specific length? ive seen several different sizes, but didn't know which would be the correct length. I forgot to add earlier that I will be making an exhaust set up as well.

but with the current parts, and flywheel, rod no machining is needed correct?


would I need to change out the piston?
 
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CarPlayLB

CarPlayLB

Well-Known Member
#4
#4
Once you get the head off the motor carefully measure the distance from the piston top the the deck. A lot of Predators are .020 down. If that is the case, buy the rod that is .020 longer to get to zero deck height. That will give ya bump in compression and help all of this stuff work better together!

....and please don't forget the billet flywheel! I don't trust the Chinese stuff over 4k rpm's!
 
Possom point

Possom point

Active Member
#6
#6
Thank you CarPlay. I will be seeking help for this. I'm pretty good with motors in some instances but once I get inside one I get lost very very quick, hopefully with the help from all on the forum I can get my motor completed
 
Possom point

Possom point

Active Member
#13
#13
When installing a ARC Billit flywheel, does everyone do the timing wheel? Or just install wheel then set clearance?
I watched the video that ARC racing did for flywheel installation, but have seen posts with and without doing the timing wheel....... Just wondering:confused:
 
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OND

OND

#14
#14
If you bought a new ARC flywheel the advanced timing is already built in to it... bolt it on with the stock key and you are done. Set your coil air gap at .030 or.040 what ever ARC recommends .
 
Possom point

Possom point

Active Member
#15
#15
OND said:
If you bought a new ARC flywheel the advanced timing is already built in to it... bolt it on with the stock key and you are done. Set your coil air gap at .030 or.040 what ever ARC recommends .
Click to expand...

Glad to hear!! It's the newest style , so I'm guessing like you said it has the 32 degrees built in
 
Possom point

Possom point

Active Member
#16
#16
Got my parts in today!!!! Shout out to OldMiniBikes Warhouse for a speedy delivery!!!! Flywheel,Rod and some other misc. parts. Already striped the 212 to bare block and removed governor and oil sensor. Will start this weekend on putting new parts in.
 
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