Planet Minis

blackjer

Which would be best for a maximum power application?

What shift pattern does the lifan have?

Thanks

RcWannabe

Both are 4 up trans, if you plan to modify it go with a yx engine no doubt. But if I was leaving them stock I would go with the lifan.

blackjer

Yes, it will be heavily modified.

I want to know which is capable of making the most reliable hp.

RcWannabe

Yx has more easy big hp options, the lifan you have to get more creative.

ShortFuseMP

im tossed up on that same problem, but i know i cant buy a yx and build it and be able to control it
im just going to buy a lifan 150 for 350 bux!
im going to port and polish the head, and buy a new cam
put a 26 oko or mikuni on it
im building my 140 the same way right now
that is why im tossed up on the 150 but i hear out the box it is snappier and quicker than the yx

noVtecHERE

Hands down the yx sine there is aftermarket support for it already. It is ahead of the pack. I'm digging the daytons style cover on the lifan though. And as for gobs of power. Remember the drivetrain takes beating.

blackjer

Where can you get the new lifan for $350?

blackjer

I was thinking of a YX with the TB roller rocker head and a 165 kit for starters.

firepower354

Shortz, a YX with a higher compression piston is the easy choice. The squeeze gets back the low end, and the better breathing comes on the top. You can get YX's for under $50 0 shipped, and add a TB143 piston for $60. Portjob and cam in a 150 will cost nearly the same.

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blackjer

This engine will be for drag racing only.

blackjer

This is what itll be going in.

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blackjer

Its got a lifan 140 on 50% nitro. Inner rotor, ported head, 26mm carb, and some other little tricks.

micro75

That thing looks good. But, if you still need more both options are good. The Lifan 150 would use the head and cam you currently have. The 160 GPX with the Trailbikes V2 head would probably make more power after mods. But the next big issue for you is going to be your clutch. Probably going to have to look into a locker. lol - john

FASTFREAK693

What's that silly thing run in the quarter? On 50% what kind of hp's it making? And last but not least CAN I RIDE IT!!!

blackjer

Its already got a heavily modified clutch. Im sure we could work the YX clutch over to make it hold.

blackjer

It would never make the 1/4 mile because of gearing.

We run it 300 ft.

Not sure on power but it runs damn good.

dood

power is not the problem, it's the tranny. I could get you almost mid 20's on gas, but with 50% it would be more, but don't expect the tranny to live, no matter how much you cryo the stuff. It will need to be replaced. Period.

bagadonutz

I'd like to know where you can get the lifan 150 for 350.00 also. Ship me one on monday.

blackjer

So, which engine do you prefer? Exactly what breaks in these transmissions?

Weve had a problem with transmissions before on other bikes, and we got around that by going to a complete billet trans, or just a billet gear for the weakest gear.

FASTFREAK693

If you have those options at hand the YX is the hands down way to go. Build yourself a billet trans, billet clutch basket with 6 discs and at least 5 springs and put a 178+R setup on it and do the nitro thing. Good to go!