Predator 420cc questions

[Slippy09]

How can I go about gettin my predator 420cc go kart ready. Besides torque converter. Is there any special things needed or just hook it up run thottle cable and be done? Very very new to this

 

[OzFab]

That depends on what engine was on it previously: the mounting plate may need to be modified/replaced

 

[Soapbox kid]

The 420 will need motor mounts the "footprint" base of the motor is bigger than what some would run that & a 1" clutch or whatever u choose to run.Everything else is pretty much the same. I have one im putting on a racing frame..& welcome to the forum.

 

[Slippy09]

I already modified The frame for 420 just waiting to get the engine in, imma modify the front steering for sharp tunning I'm hopping it will get high speed drifter is theory I wanna upgrade power on it with forged internals cams large carb. I want 20hp minimal

 

[Soapbox kid]

I'm taking my head to a local shop to be done for $75.With a cam & valve kit upgrade I think it will be fun. Keep posting on ur progress I like to hear more about it.

 

[smgs92]

The 420 will need motor mounts the "footprint" base of the motor is bigger than what some would run that & a 1" clutch or whatever u choose to run.Everything else is pretty much the same. I have one im putting on a racing frame..& welcome to the forum.

actually my 420cc is slotted so that it bolts up to a smaller mounting plate for 6-6.5hp engines.
however the chain alignment was off so I have to move my mounting plate over.

 

[Soapbox kid]

I didn't notice the slots until I took my block apart. That did put my budget back on track sort of...lol

 

[smgs92]

lol Glad I could help.

 

[Slippy09]

So update on go kart, all forged parts be in soon plus mild cam, with rhb31 turbo. Will be bolted on clipped so it should be good

 

[OzFab]

Seriously? That was a huge jump!

 

[smgs92]

Where did you find the internals? 390 parts such as a cam will not fit in a 420.
Not to crush your dreams on the turbo either but with these engines the power to weight ratio for a turbo is ineffective meaning it will work and be cool but you won't get a largely noticeable increase in power.

 

[simblarosh]

420 cc predator should give PLENTY OF POWER. But just from experience you should definetly go with a 40 series TC for full potential. Check out my cart I used a Predator 349cc and have plenty of power.

http://www.diygokarts.com/vb/showthread.php?t=20584

 

[Grimace]

If you are doing a cam/head combo with an aftermarket carb & exhaust, spend the money on a 44 series driver and driven clutch. The 40 series is only rated to 18 hp and you may exceed that with your list of goodies. I have had my 420 predator for over a year and a half, and have had ZERO problems with it. One thing though, unplug the low oil sensor on the front of the block. It kills the engine in a sharp turn.

 

[smgs92]

For that reason I'm going to run a snomo CVT. They're cheaper, can hold up to any power and easily adjusted. You'll need an adapter for the shaft, look for my thread on my yerf dog and it should be in there i think pg. 2.

 

[SlimBeaver]

? im building a rev trike and im going to use 13 hp electric start engine from harbor freight and going to use 40 series comet clutch with 18 in wheels what do you think the outcome speed i could achive would be im wanting to build a comuter trike to go back and forth to work on lol wanting to reach speeds of 65 mph i figured if a motor scooter could get that from a 250cc why could i not get that with 420cc just tring to beat the pump LOL

 

[smgs92]

Well they rev up a lot higher so if you build it up to rev higher and then gear it properly I don't see why it wouldn't work. After all my minibike that revs up to around 6000rpm hits 50mph. good luck getting it street legal.