420cc predator build

[420cc quad build]

Hey so I was wanting to get a bigger engine for my 2014 Honda Trx250 and was thinking about build a motor (more like buying a motor and modding it) and I was wondering what kind of gearbox should I use and where can I get them?!!

 

[JTSpeedDemon]

I don't know what kind of vehicle you have, honestly, but I suspect it's an ATV. EDIT - Oops, just saw your username.
If it already has a gearbox on it, I'd use that. Or is it a belt drive torque converter?
If you get a Predator 420 and mod it out, you may actually lose top speed if it's not compatible with the gearbox.
Now if you're asking what shiftable gearbox options there are for a 420, there's basically none, unless you can track down an old seperate motorcycle transmission.
Trust me, on most projects, a single speed's all ya need.

 

[turnleftandgasit]

I bought a street/track 420 from NR Racing. Factory based cam, billet rod and flywheel. Spins 5500 rpm. 28hp @ 4000...... 40tq @ 3250........still has 22 hp and tq @ 5500 rpm

 

[landuse]

Hey so I was wanting to get a bigger engine for my 2014 Honda Trx250 and was thinking about build a motor (more like buying a motor and modding it) and I was wondering what kind of gearbox should I use and where can I get them?!!

Dropping a 420 into a quad bike is going to require quite a lot of modification. Are you up to the challenge? Lets see some pics of what you have got to work with first

 

[Kartorbust]

You'll be better off either getting engine work done to that TRX engine or buying a different quad. Don't pull a Carsandcameras just because they did it. You'll have to modify the rear end because it uses a driveshaft, not a chain and sprocket like a lot of race quads use. It's not worth the effort and money to fabricate a industrial engine to a shaft drive quad. And you'll be going down in power, 13hp vs the stock probably around 25hp even with mods, it won't hold up as well.