Predator/Clone 208 Build

[OND]

I've had this engine for a couple of years now and it's time to do something with it. Nothing like a full blown race engine , just a low end to mid range power engine. Also it will be a pull start engine .
Here's what it looks like from the factory.

No fuel cut off lever ^^^^ only the choke.

Notice the valve cover shape.

Crankshaft has to go or be turned down to a 3/4'' shaft .

No low oil sensor inside or out .

Huayi carb , still probably a .615 venturi , but I'll measure if I decide to use it .

Head numbers .

 

[OND]

_.JPG[/img][/url]

27mm intake valve and a 25mm exhaust valve ...looks like about a 22cc chamber.

Side shot of the engine and the carb, no fuel shut off valve.

 

[OND]

No low oil sensor or wiring inside .

70mm (2.753) piston that's dished.

 

[TheDullCarbide]

Interesting rockers. I'm surprised the valves are so big from factory. They should be perfect.:thumbsup:

 

[DeadPixel]

Interested in seeing where you go with this build.

 

[OND]

Interesting rockers. I'm surprised the valves are so big from factory. They should be perfect.:thumbsup:

Yea rockers are totally different from what I'm use to seeing in a clone/predator engine, and was kinda surprised that the valves were this size . Not sure yet if I'll use this head though ...but we'll see.

Interested in seeing where you go with this build.

Probably just going to pump it up a little . I've got some parts coming all ready and will post them when they come in.

 

[OND]

Some numbers from these original parts.

Bore is : ( 70mm or 2.753)
Stroke is: (2.128)
Rod length is : (3.305)
Rod journal : (1.180)
Wrist pin is :.(.715)
Piston in hole : (.020)

 

[OND]

Looks like the good folks at ARC Racing does make a rod for this engine . I'm a little surprised with the crank / rod journal being a 1.180 and the wrist pin being a .715 . But still good to know that they have it if needed.

 

[danford1]

See if a clone crank will fit, that is much easier than getting that crank machined and key slotted.
JMO Danford1

 

[CarPlayLB]

Hey E! Like Danford said, a clone crank may be a better ooption for you
https://www.OldMiniBikes.com/stock-crankshaft.html
we have the rod too
https://www.OldMiniBikes.com/6773-ducar-212cc-3-303-billet-rod


on a side note, does that stock crank have a GX200/Clone taper on the flywheel side? [MENTION=47323]OND[/MENTION]

 

[OND]

See if a clone crank will fit, that is much easier than getting that crank machined and key slotted.
JMO Danford1

Clone crank will fit in the block and bearings Dan , thinking about going with that option. Waiting on a piston to come in now.

Hey E! Like Danford said, a clone crank may be a better ooption for you
https://www.OldMiniBikes.com/stock-crankshaft.html
we have the rod too
https://www.OldMiniBikes.com/6773-ducar-212cc-3-303-billet-rod


on a side note, does that stock crank have a GX200/Clone taper on the flywheel side? [MENTION=47323]OND[/MENTION]

Thanks Eric , and yea I will buy the rod from the OldMiniBikes warehouse and maybe a crank to , waiting on a piston to come in .
I checked OldMiniBikes warehouse first for the piston and it showed to be out of stock. ( I tried )
I will check the taper on the OEM shaft this weekend and let you know . I know the camshaft is going to be for a Predator and not the Clone/Hemi engines. Side journals on cam measure .556

 

[OND]

Here is the piston I'm going to use on this build, it came in today. Hemi head flat top with two .050 deep valve reliefs ...stock diameter piston. Now I can get some measurements for a crank shaft and billet rod .

 

[OND]

Using the new piston and a max stroke clone crank (measures 2.129)I had on hand I was able to measure out the piston in the hole and ended up with .046.
I'll order a .020 over size ARC clone rod this week , that will leave me .026 in the hole. Will also order a .010 Predator head gasket to .

Got three heads on hand and not sure which one I'll use yet...Hemi head, 208 head and a 14cc GX160 head.

 

[OND]

Got some parts ordered tonight cam, rod and valve springs from the OldMiniBikes warehouse, Eric [MENTION=31879]CarPlayLB[/MENTION] let me know when the .010 Predator head gaskets come in ?

 

[ole4]

Where did you get the notched piston?

 

[OND]

Ole the piston came off Ebay , a guy here in Kentucky is selling them .

 

[OND]

I Love my Mail Lady ! :thumbsup: More parts came in from the OldMiniBikes Warehouse today , Thanks Guys ! I love the "FREE" shipping. OK on with the new parts .

ARC Billet rod #6271 Honda/Clone 3.323 in length...or .020 longer than the stock clone rod of 3.303. Wrist pin measures .709.

Dyno Cam CM grind 265/265 lift cut on a Predator core .

22# Springs from the OldMiniBikes Warehouse . Still might go bigger on the springs yet , but Dyno cams recommend these springs for this cam.

 

[TheDullCarbide]

Let us know how you like the CM. I'm interested in the CS, CM, or 275.

I know in general that Dyno calls for less spring than NR.

 

[DeadPixel]

I'm curious dose the GX160 head have smaller intake and exhaust ports than a GX200 head? I have not had a 14cc head yet only the UT1 18cc.

 

[OND]

Let us know how you like the CM. I'm interested in the CS, CM, or 275.

I know in general that Dyno calls for less spring than NR.

Will do ! I'm Interested in these smaller cams myself.